Manual Gossen Metrawatt METRAHIT ULTRA (page 59 of 74) (English)

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METRAHIT⏐ULTRA and METRAHIT⏐ULTRA BT

High Resolution TRMS Digital Multimeter

Operating Instructions

3-349-684-03

6/3.15

2 GMC-I Messtechnik GmbH

Scope of Delivery Contact Persons

Scope of Delivery

1Multimeter

1 KS17-2 measurement cable set

2 Batteries

1 Condensed operating instructions

CD ROM (content: operating instructions, data sheet and more)

1 DAkkS calibration certificate

1 Rubber holster

Included Functions

16 Mbit = 2048 kByte = 300,000 measured values,

sampling rate adjustable from 0.1 seconds to 9 hours

Function METRAHIT ULTRA /

METRAHIT ULTRA BT

M248A / M248B

Voltage, V

(Ri = 10 MΩ)

Voltage, V

TRMS (Ri = 5 MΩ)

Voltage, V

AC+DC

TRMS (Ri ≥ 5 MΩ)

Frequency, Hz @ V

@ V

AC+DC

Up to 300 kHz

1 kHz low-pass filter @ V

@ V

AC+DC

Bandwidth @ V

AC+DC

or V

100 kHz

Pulse frequency, MHz @ 5 V TTL 1 Hz to 1 MHz

Duty cycle as %

2.0% to 98%

Voltage level measurement, dB @ V

@ V

AC+DC

Resistance, Ω

Continuity test, ICONST = 1 mA

Diode test,

CONST

= 1 mA

Temp. measurement °C/°F @ T

Type K

Temp. measurement °C/°F R

Pt100/Pt1000

Capacitance measurement, F

Current, A

300

A / 3 mA

30 mA / 300 mA

3A / 10

A (16 A)

Current, A

AC+DC

TRMS

Current, A

TRMS

Bandwidth @ A

AC+DC

or A

10 kHz

Frequency, Hz @ A

@ V

AC+DC

Up to 30 kHz

Current clamp measurement with ad-

justable transformation ratio

mV / A

mA / A

Data logger function

(memory) 16 MBit (2 MB)

Relative value measurement

ΔREL

Zero point

Min / Max / Data Hold

IR interface (38.4 kBd)

Bluetooth interface (38.4 kBd)

M248B only

Power pack socket

Rubber holster

Fuse 10 A / 1000 V

Protection IP 52

Measuring category 600 V CAT III

300 V CAT IV

DAkkS Calibration Certificate

Function METRAHIT ULTRA /

METRAHIT ULTRA BT

M248A / M248B

GMC-I Messtechnik GmbH 3

Contact Persons

Accessories (sensors, plug inserts, adapters, consumable materials)

The accessories available for your instrument are checked for

compliance with currently valid safety regulations at regular inter-

vals, and are amended as required for new applications. Currently

up-to-date accessories which are suitable for your measuring in-

strument are listed at the following web address along with photo,

order number, description and, depending upon the scope of the

respective accessory, data sheet and operating instructions:

www.gossenmetrawatt.com

see also section 3.1

Fuse for current measuring ranges, see section 9.3

This device may not be disposed of with the trash.

Further information regarding the WEEE mark can be

accessed on the Internet at www.gossen-

metrawatt.com under the search term WEEE (see also

section 9.5).

Calibration Seal (blue seal):

See also “Recalibration” on page 69.

5V/600mA

XY123

2012-06

D-K

15080-01-01

Consecutive number

Registration number

Date of calibration (year – month)

Deutsche Akkreditierungsstelle GmbH – calibration lab

16 GMC-I Messtechnik GmbH

Initial Start-Up – Setup

3 Initial Start-Up

3.1 Inserting Batteries or Rechargeable Batteries

Be certain to refer to section 9.2 regarding correct battery installa-

tion.

Momentary battery voltage can be queried in the Info menu (see

section 6.3).

Attention!

Disconnect the instrument from the measuring circuit before

opening the battery compartment lid in order to replace the

batteries.

Operation with the Power Pack

(accessory for METRAHIT ULTRA, not included, see section 10.3)

Installed batteries are disconnected electronically if the NA X-TRA

power pack is used, and need not be removed from the instru-

ment.

If rechargeable batteries are used, they must be recharged exter-

nally.

If the external power supply is switched off, the device is switched

to battery operation without interruption.

3.2 Switching the Instrument On

Switching the Instrument On Manually

Ð Press the ON / OFF | LIGHT key until the display appears.

Power-up is acknowledged with a brief acoustic signal. As

long as the key is held depressed, all of the segments at the

liquid crystal display (LCD) are illuminated.

The LCD is depicted on page 13.

The instrument is ready for use as soon as the key is released.

Display Illumination

After the instrument has been switched on, background illumina-

tion can be activated by briefly pressing the ON / OFF | LIGHT key. Il-

lumination is switched back off by once again pressing the same

key, or automatically after approximately 1 minute.

Switching the Instrument On with a PC

The multimeter is switched on after transmission of a data block

from the PC, assuming that the “irStb” parameter has been set to

“ir on” (see section 6.4).

However, we recommend using the power saving mode: “ir off”.

Note



Electrical discharge and high frequency interference may

cause incorrect displays to appear, and may disable the

measuring sequence.

Disconnect the device from the measuring circuit. Switch the

instrument off and back on again in order to reset. If the

problem persists, briefly dislodge the battery from the con-

nector contacts (see also section 9.2).

3.3 Setting the Operating Parameters

Setting Time and Date

See the “t iME” and “dAtE” parameter in section 6.4.

GMC-I Messtechnik GmbH 17

Initial Start-Up – Setup

3.4 Switching the Instrument Off

Switching the Instrument Off Manually

Ð Press the ON / OFF | LIGHT key until 0FF appears at the display.

Shutdown is acknowledged with a brief acoustic signal.

If hazardous contact voltage has been detected (HV symbol

appears), the instrument cannot be switched off.

Automatic Shutdown

The instrument is switched off automatically if the measured value

remains unchanged for a long period of time (maximum measured

value fluctuation of approx. 0.8% of the measuring range per min-

ute or 1° C or 1° per minute), and if none of the keys or the rotary

switch have been activated before a selected period of time in

minutes has elapsed (see “APoFF” parameter on page 51). Shut-

down is acknowledged with a brief acoustic signal.

Automatic shutdown is disabled in the following operating modes:

continuous operation and whenever dangerous contact voltage

has been detected (exception: memory mode).

Disabling Automatic Shutdown

The instrument can be set to continuous operation.

Ð While switching the instrument on, simultaneously press the

and keys to this end.

The “Continuous On” function is indicated at by means of the

ON display to the right of the battery symbol.

The “Continuous On” setting can only be canceled by changing the

respective parameter (see “APoFF” page 51) or by switching the

instrument off manually.

In this case, the parameter is reset to 10 minutes.

ON / OFF

LIGHT

FUNC

ENTER

ON / OFF

LIGHT

Auto-Range

8.8.8.8.8

Illumination ON

000.00

ON / OFF

LIGHT

Illumination OFF

000.00

ON / OFF

LIGHT

0ff

ON / OFF

LIGHT

long

(1 s)

18 GMC-I Messtechnik GmbH

Control Functions

4 Control Functions

4.1 Selecting Measuring Functions and Measuring Ranges

The rotary switch is linked to the automatic socket blocking

mechanism, which only allows access to two connector jacks for

each function. Be certain to remove the appropriate plug from its

respective jack before switching to and from the “A” functions.

The socket blocking mechanism prevents the user from inadver-

tently turning the selector switch to impermissible functions after

the measurement cables have been plugged into the instrument.

Presence of Dangerous Touch Voltages

If dangerous volt-

ages are applied in

the high-imped-

ance voltage mea-

suring functions

(switch position V

or PQ), switching

to low-impedance

measuring func-

tions (switch posi-

tion MHz, Ω, conti-

nuity, temperature

or capacitance)

causes “HiVoLt” to

appear at the dis-

play and the re-

spective measure-

ment is disabled. The measuring function is not switched until

dangerous touch voltage is no longer applied to the input. If the

instrument switches itself off in the event that hazardous touch

voltage is applied (during memory mode operation with large

sampling period), the high-voltage warning symbol remains visible

at the display.

4.1.1 Automatic Range Selection

The multimeter is equipped with auto-ranging for all measuring

functions, except for temperature measurement and diode and

continuity testing. Auto-ranging is active as soon as the instru-

ment is switched on. The instrument automatically selects the

measuring range which allows for highest possible resolution of

the applied quantity.

AUTO-Range Function

The instrument is switched automatically to the next higher range

at ±(310,000 d + 1 d) → 031,000 digits, and to the next lower

range at ±(28,000 d – 1 d) → 27,999 digits.

The instrument automatically switches to the next higher or next

lower measuring range for the following measured quantities:

230

050

TRMS

U > 45 V:

Temp

RTD

hivolt

Measuring Range

Reso-

lution

Switching to Next

Higher Range

at ±(... d + 1 d)

Switching to Next

Lower Range

at ±(... d -1 d)

V, A, Ω, Hz 5¾ 310,000 28,000

V , V , A , A 4¾ 31,000 2800

3 nF ... 3 mF 3¾ 3100 280

GMC-I Messtechnik GmbH 19

Control Functions

4.1.2 Manual Measuring Range Selection

Auto-ranging can be deactivated and measuring ranges can be

selected manually in accordance with the following table by

pressing the MAN / AUTO button.

The desired measuring range can then be selected with the

 or

 scroll key.

The instrument is automatically returned to automatic range se-

lection when the MAN / AUTO key is pressed, the rotary switch is

activated or the instrument is switched off and back on again.

Overview: Auto-Ranging and Manual Range Selection

* Via manual measuring range selection only

Function Display

MAN / AUTO

Manual mode active:

utilized measuring range is fixed

MAN

 or 

Range switching sequence for:

V :

300 mV*

↔

30 V

↔

300 V

↔

600 V

Hz (V AC)

:300 Hz

↔

3 kHz

↔

30 kHz

↔

300 kHz

MHz:

300 Hz

↔

3 kHz

↔

30 kHz

↔

300 kHz

↔

1 MHz

300

Ω ↔

3 k

Ω ↔

30 k

Ω ↔

300 k

Ω ↔

3 M

Ω ↔

30 M

A :

300

↔

3 mA

↔

30 mA

↔

300 mA

↔

10 A (16 A)

Hz (A AC):

300 Hz

↔

3 kHz

↔

30 kHz

F :

3 nF

↔

30 nF

↔

300 nF

↔

300

↔

MAN

MAN / AUTO

Return to automatic measuring range selection —

20 GMC-I Messtechnik GmbH

Control Functions

4.1.3 Quick Measurements

Measurements performed using a suitable fixed measuring range

are executed more quickly than those which utilize automatic

range selection. Quick measurement is made possible with the

following two functions:

• Manual measuring range selection, i.e. selection of the measuring

range with the best resolution (see section 4.1.2)

•With the DATA function (see section 4.4). In this way, the appro-

priate measuring range is selected automatically after the first

measurement, and the second measurement is executed more

quickly.

The selected measuring range remains active for the subsequent

series of measurements with these two functions.

4.2 Zero Offset / Relative Measurements

Zero offset or a reference value for relative measurements can be

stored to memory depending upon deviation from the zero point:

The relevant reference or correction value is deducted individually

for the respective measuring function as an offset from all future

measurements and remains in memory until deleted, or until the

multimeter is switched off.

Zero balancing and reference value adjustment can be used for

auto-ranging, as well as for manual measuring range selection.

Zero Balancing

Ð Plug the measuring cables into the instrument and connect the

free ends to each other, except for capacitance measurement

in which case the ends of the cables are not connected to

each other.

Ð Briefly press the ZERO | ESC key.

The instrument acknowledges zero balancing with an acoustic

signal, and the “ZERO ΔREL” symbol appears at the LCD. The

value measured at the moment the key is pressed serves as a

reference value.

Ð Zero balancing can be cleared by once again pressing the

ZERO | ESC key.

Note



As a result of TRMS measurement, the multimeter can dis-

play a residual value of 1 to 30 digits with short-circuited

measurement cables as the zero point for V AC / I AC or

V(AC+DC) / I (AC+DC) measurements (non-linearity of the

TRMS converter). This has no influence on specified accu-

racy of the measuring range.

Setting the Reference Value

Ð Plug the measuring cables into the instrument and measure a

reference value (max. 150,000 digits, in the 10 A DC range:

50,000 digits = 50% of the measuring range).

Deviation from zero

– With short-circuited measurement cables for V, Ω, A

– With open input for capacitance unit of measure (F)

Display

0 to 200 digits ZERO ΔREL

> 200 D to (150,000 digits) 50% of the measuring range ΔREL

GMC-I Messtechnik GmbH 21

Control Functions

Ð Briefly press the ZERO | ESC key.

The instrument acknowledges storage of the reference value

with an acoustic signal, and the “ZERO ΔREL” or the “ΔREL”

symbol appears at the LCD. The value measured at the mo-

ment the key is pressed serves as a reference value.

Ð The reference value can be cleared by once again pressing the

ZERO | ESC key.

Notes Regarding Relative Measurement

• Relative measurement effects the main display only.

• In the case of relative measurement, Ω F or AC quantities may

also appear as negative values.

4.3 Display (LCD)

Measured Value, Unit of Measure, Type of Current, Polarity

The measured value with decimal and plus or minus sign appears

at the digital display. The selected unit of measure and current

type are displayed as well. A minus sign appears to the left of the

value during the measurement of zero-frequency quantities, if the

plus pole of the measured quantity is applied to the “⊥” input.

Overranging

If the upper range limit of 31,000 digits is exceeded “0L” (overload)

appears at the display.

“0L” appears at the display as of 3100 digits during capacitance

measurement, as well as during continuity and diode testing.

22 GMC-I Messtechnik GmbH

Control Functions

4.4 Measured Value Storage: DATA (auto-hold / compare)

An individual measured value can be automatically “frozen” with

the DATA function (auto-hold). This is useful, for example, when

contacting the measuring points with the test probes requires

your full attention. After the measuring signal has been applied

and the measured value has settled in in accordance with the

“condition” listed in the table below, the measured value is frozen

at the digital display and an acoustic signal is generated. The test

probes can now be removed from the measuring points, and the

measured value can be read from the digital display. If the mea-

suring signal falls below the value specified in the table, the func-

tion is reactivated for storage of the next value.

Measured Value Comparison (DATA compare)

If the currently frozen value deviates from the first saved value by

less than 100 digits, the acoustic signal is generated twice. If devi-

ation is greater than 100 digits, only a brief acoustic signal is gen-

erated.

Note



The selected measuring range cannot be manually changed

as long as the DATA function is active.

The DATA function is deactivated by pressing and holding the

DATA/MIN/MAX key (approx. 1 second), when the measuring func-

tion is changed or when the instrument is switched off and back

on again.

Reactivation results from falling short of specified measured value limits.

Two acoustic signals are generated the first time a measured value is saved as a reference value.

For subsequent data hold, two acoustic signals are only generated if the currently frozen value deviates

from the

first

saved value by less than 100 digits.

Key: MV = measured value, MR = measuring range

DATA

Function

Press

DATA /

Min-Max

Condition

Response from

Instrument

Measuring

Function

Measuring

Signal

Display

Acous-

tic

Digital

DATA

Activate Brief Blinks Once

Save

(stabilized

measured

value)

V, A, Hz, dB,

F, %

> 10%

r MR

Is dis-

played

Static

Once

Twice

≠ 0L

Reactivate

V, A, Hz, dB,

F, %

< 10%

r MR

Stored

Blinks

= 0L

Change to

Min-Max

Brief See table in section 4.4.1

Exit Long

cleared

Twice

V, A, Hz

t [s]

300000

30000

Activated

Reactivated

Save

of Measuring Range

100 %

10 %

GMC-I Messtechnik GmbH 23

Control Functions

Example

The voltage measuring range is set manually to 3 V. The first mea-

sured value is 2.2 V and is stored to memory because it is greater

than 5000 digits of the measuring range (= 0.3 V), and is thus reli-

ably above the background noise level. As soon as the measured

value drops to less than 3000 digits of the measuring range, i.e.

amounts to less than 0.3 V which corresponds to removal of the

test probes from the measuring point, the instrument is ready to

store a new value.

4.4.1 Saving Minimum and Maximum Values – Min/Max Function

Minimum and maximum measured values applied to the measur-

ing instrument’s input after the Min-Max function has been acti-

vated can be “frozen” at the display. The most important use of

this function is the determination of minimum and maximum val-

ues during long-term measured value observation.

The Min–Max function can be activated in all measuring functions.

Apply the measured quantity to the instrument and set the mea-

suring range with the MAN / AUTO key before activating the Min-

Max function.

The Min-Max function is deactivated by pressing and holding the

DATA/MIN/MAX key (approx. 1 second), when the measuring func-

tion is changed or when the instrument is switched off and back

on again.

Note



As opposed to the DATA function, the Min-Max function can

also be used for temperature measurement.

Function

Min-Max

Press

DATA /

Min-Max

Min. and Max.

Measured Values

Response from Instrument

Display

Acous-

tic

Signal

Measured

value, digital

Max.

min.

Activate

and save

2 x short are saved

Current

measured

value

Max

and

min

2 x

Save and

display

Brief

Storage continues in

background, new min. and

max. values are displayed.

Saved min.

value

Min. 1 x

Brief

Saved max.

value

max. 1 x

Return to

Brief

Same as 1, stored values

are not deleted

Same as 1

Same

as 1

1 x

Stop Long are deleted

Current

measured

Vvalue

deleted

2 x

24 GMC-I Messtechnik GmbH

Control Functions

4.5 Measurement Data Recording

The instrument is capable of recording measurement data using

an adjustable sampling rate for long periods of time in the form of

measurement series. Data are stored to permanent memory, and

are retained even after the multimeter is switched off, and after

battery replacement. The system acquires measured values rela-

tive to real-time.

Stored measured values can subsequently be read out at the

computer. The only prerequisite is a PC which is connected by

means of an interface cable to the USB X-TRA bidirectional inter-

face adapter, which is plugged onto the METRAHIT ULTRA.

See also section 7, “Interface Operation”.

4.5.1 Long-Term Recording

Preparing for Recording – Parameter Settings

Ð First set the sampling rate for memory mode operation (see rAtE

parameter on page 53).

Ð Set hysteresis for efficient use of available memory space. Dur-

ing memory mode operation, new measured data are only

saved if they deviate from the previously stored value by an

amount which exceeds the selected hysteresis value (see

“hyst” parameter on page 53).

Ð Adjust “t.StorE” (see page 54) in order to limit recording dura-

tion.

Ð First select the desired measuring function and an appropriate

measuring range.

Ð Check the battery charge level before starting long-term mea-

surement recordings (see section 9.2).

Connect the NA X-TRA power pack if required.

Memory Parameters Overview

Starting Recording via Menu Functions

Ð Switch to the “SETUP” mode by pressing MEASURE | SETUP and

select the “StorE” menu.

1nFo

 ...  StorE Store off StArt

Ð Memory mode operation is started by acknowledging with

FUNC | ENTER. STORE appears in the header and indicates that the

memory mode has been activated. “Store” appears at the main

display. If trigger conditions are activated,

TRIG also blinks in the

header.

Ð Press the MEASURE | SETUP key in order to return to the measur-

ing function.

Parameter Page: header

CLEAr

25: Clear Memory

EMpty

25: Clear Memory – appears after CLEAr

Hyst

53: HYSt – Hysteresis (parameter for memory mode operation)

0CCvP

25: Querying Memory Occupancy

rAtE

53: rAtE – Set Transmission and Storage Rate

StArt

24: Starting Recording via Menu Functions

StoP

25: Ending Recording

trig

54: triG – Trigger Conditions (parameters for memory mode operation)

tstore

54: tStorE – Recording Time (parameter for memory mode operation)

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

GMC-I Messtechnik GmbH 25

Control Functions

Ending Recording

Ð If the instrument is in the measuring mode, return to the menu

function by pressing the MEASURE | SETUP key. Select “StorE”

again and acknowledge by pressing the FUNC | ENTER key.

“StoP” blinks at the main display.

store on StoP store

Ð Acknowledge the “StoP” display by pressing FUNC | ENTER.

The

STORE display segment in the header is cleared, indicating

that recording has been ended.

Ð Press the MEASURE | SETUP key in order to return to the measur-

ing function.

Ð Memory mode operation can also be exited by switching the

multimeter off.

Querying Memory Occupancy

Memory occupancy can be queried during recording with the

help of the “1nFo” menu (see also section 6.3).

Memory occupancy range: 000.1% to 099.9%.

1nFo

bAtt



...



0CCvP

017

Clear Memory

This function deletes all measured values from memory!

It’s advisable to execute this function before starting a new mea-

surement data recording.

1nFo

 ...  StorE store off StArt (blinks)



store CLEAr store CLEAr no  yes

store empty (appears briefly) → store

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

26 GMC-I Messtechnik GmbH

Control Functions

4.5.2 Storage of Individual Values using the SAMPLE or dAtA Sampling

Rate

If only individually selected values need to be saved, SAMPLE must

be selected as the StorE > rAtE sampling value. If memory mode

operation is then started, a single measured value is saved to per-

manent memory with time stamp when the DATA/MIN/MAX key is

pressed and held until two rapidly repeating acoustic signals are

generated.

If dAtA is selected as the StorE > rAtE sampling rate, and if mem-

ory mode operation is then started, measured values ascertained

with activated DATA function are automatically saved to perma-

nent memory with time stamp.

4.5.3 Rapid Momentary Value Acquisition for U DC and I DC

Rapid momentary value acquisition is only activated during mem-

ory mode operation in the U DC and I DC functions, and only after

selecting a sampling periods of 0.5, 1, 2, 5, 10, 20 or 50 ms: All

trigger and hysteresis functions are available, although the mo-

mentary value is acquired with a separate measuring circuit.

This allows for the recording of the waveshapes of low-frequency

signals with reduced resolution and accuracy (typically < 1% of the

measuring range under reference conditions, not specified).

Roughly 300,000 measured values can be saved in this mode.

Values of up to about 1.9 x Umax or Imax are recorded (with fixed

range, range-dependent fluctuations), and thus the range limits

can be exceeded by approximately 90%.

Note



The ZERO/ΔREL function is not taken into consideration for

rapid momentary value acquisition!

GMC-I Messtechnik GmbH 27

Control Functions

28 GMC-I Messtechnik GmbH

V/Hz, Ω, Temperature, and A/Hz Measurements

5 Measurements

5.1 Voltage Measurement

Notes Regarding Voltage Measurement

• The multimeter may only be operated with installed batteries or re-

chargeable batteries. Dangerous voltages are otherwise not indi-

cated, and the instrument may be damaged.

• The multimeter may only be operated by persons who are ca-

pable of recognizing contact hazards and taking the appropriate

safety precautions. Contact hazards exist anywhere, where

voltages of greater than 33 V (RMS) may occur. The test

probes may only be gripped up to the finger guard. Do not

touch the metallic test probes under any circumstances.

• Avoid working alone when taking measurements which involve

touch hazards. Be certain that a second person is present.

• For the METRAHIT ULTRA, maximum allowable voltage between the

connector sockets and ground is 600 V for measuring cate-

gory III and 300 V for measuring category IV.

• Be prepared for the occurrence of unexpected voltages at de-

vices under test (e.g. defective devices). For example, capaci-

tors may be dangerously charged.

• No measurements may be made with this instrument in electri-

cal circuits with corona discharge (high-voltage).

• Special care is required when measurements are made in HF

electrical circuits. Dangerous pulsating voltages may be pres-

ent.

• Be aware of the fact that dangerous voltage spikes are not displayed

during measurement with the low-pass filter. We recommend mea-

suring voltage without the low-pass filter first, in order to be able to

detect any dangerous voltages.

• Be absolutely certain that the measuring ranges are not over-

loaded beyond their allowable capacities. Limit values are included

in section 8, “Technical Data”, in the table entitled “Measuring

Functions and Measuring Ranges” in the “Overload Capacity”

column.

• 300 mV range: Thermovoltages occur in the event of tempera-

ture fluctuation, which appear as additional voltage offset. It

may be necessary to repeat zero offsetting in order to achieve

the specified degree of accuracy.

Scope of Functions, Voltage Measurement

A 1 kHz low-pass filter can be used in this case, in order to filter out high

frequency pulses of greater than 1 kHz, for example when performing

measurements at pulsed motor drives.

Function

METRAHIT ULTRA

V AC / Hz TRMS, dB (Ri = 5 MΩ)

•

V AC / TP-Filter 1 kHz

(Ri = 5 MΩ) TRMS

•

V AC+DC TRMS / TP-Filter (Ri =5 MΩ)

•

V DC (Ri = 10 MΩ)

•

Pulse frequency, MHz @ 5 V TTL

•

Duty cycle as %

•

Voltage level measurement, dB @ V

@ V

AC+DC

Frequency bandwidth

100 kHz

GMC-I Messtechnik GmbH 29

V/Hz/dB – Ω, Temperature, and A/Hz Measurements

5.1.1 Direct and Pulsating Voltage Measurement, V DC and V (DC+AC)

Note



Set the CL iP parameter to 0FF in the current clamp setup

menu. Otherwise all measured values are displayed in

amperes, corrected by the amount resulting from the

selected transformation ratio for an interconnected current

clamp sensor.

1nFo  ...  SET t iME  ...  CL IP

CL Ip

set: 1 / 10/100/1000 / 0ff

Ð In accordance with the voltage to be measured, turn the rotary

switch to V or V .

Ð Connect the measurement cables as shown.

The “⊥” connector jack should be grounded.

Note



An intermittent acoustic signal warns the operator if the

measured value exceeds the upper range limit in the 600 V

range.

Make sure that a current measuring range (“A”) has not been acti-

vated when the multimeter is connected for voltage measurement! If

the fuse’s blowing limits are exceeded as a result of operator error,

both the operator and the instrument are in danger!

With the rotary switch in the V position, the multimeter is always in

the 3 V measuring range immediately after it is switched on. As

soon as the MAN / AUTO key is pressed, and assuming the mea-

sured value is less than 300 mV, the multimeter is switched to the

mV measuring range.

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

V= :

300 mV

…

600 V

> 45 V:

> 600 V:

Warnings regarding dangerous voltage:

Max. 600 V (< 5 kHz)

300 mV

…

600 V

Max. 100 V (> 10 kHz)

max

= 3 x 10

V x Hz

Measuring Ranges:

230

for U > 100 V

Hz: 5Hz … 300 kHz

1kHz

CL ip

0FF

CL ip

0FF

0020.00

230

TRMS

050

000

COM

Temp

– (+)

+ (–)

30 GMC-I Messtechnik GmbH

V/Hz, Ω, Temperature, and A/Hz Measurements

Frequency Measurement in the V (DC+AC) Switch Position

Ð Connect the measured quantity in the same way as for voltage

measurement.

Ð Manually select the measuring range for the voltage amplitude.

Ð Repeatedly press the multifunction key FUNC | ENTER until the

unit of measure Hz appears at the display.

Lowest measurable frequencies and maximum allowable volt-

ages are listed in section 8, “Technical Data”,.

Measurement with Low-Pass Filter

Attention!

Be aware of the fact that dangerous voltage spikes are not

displayed during this type of measurement (see also “Volt-

age Comparator”). We recommend measuring voltage with-

out the low-pass filter first, in order to be able to detect any

dangerous voltages.

A 1 kHz low-pass filter can be activate if required, in order to filter

out high frequency pulses of greater than 1 kHz, for example

when performing measurements at pulsed motor drives, i.e. un-

desired voltages of greater than 1 kHz can be suppressed.

The active low-pass filter is indicated by the FILTER display. The

multimeter is automatically switched to manual measuring range

selection.

Specified measuring accuracy is not reached with signals of

greater than 100 Hz when the filter is active.

V~ & Filter

CL ip

0FF

1kHz

Reference value

Current measured value

229

0000

FUNC

ENTER

FUNC

ENTER

229

FUNC

ENTER

FUNC

ENTER

TRMS

229

050

000

FILTER

MAN

TRMS

1kHz

00.775

050

000

GMC-I Messtechnik GmbH 31

V/Hz/dB – Ω, Temperature, and A/Hz Measurements

5.1.2 Alternating Voltage and Frequency Measurement V AC and Hz

V AC with Selectable Low-Pass Filter, V AC + FiL and dB V AC

Note



See note in section 5.1.1.

Ð In accordance with the voltage or frequency to be measured,

turn the rotary switch to V~.

Ð Connect the measurement cables as shown.

The “⊥” connector jack should be grounded.

Voltage Measurement

Note



An intermittent acoustic signal warns the operator if the

measured value exceeds the upper range limit in the 600 V

range.

Make sure that a current measuring range (“A”) has not been acti-

vated when the multimeter is connected for voltage measure-

ment! If the fuse’s blowing limits are exceeded as a result of oper-

ator error, both the operator and the instrument are in danger!

Ð You can switch back and forth between voltage measurement

with and without low-pass filter.

Ð Repeatedly press the multifunction key FUNC | ENTER until unit

of measure V in appears at the main display, and FILTER ap-

pears in the header for measurement with low-pass filter.

Frequency Measurement

Ð Connect the measured quantity in the same way as for voltage

measurement.

Ð Manually select the measuring range for the voltage amplitude.

Ð Repeatedly press the multifunction key FUNC | ENTER until unit

of measure Hz appears at the display.

Lowest measurable frequencies and maximum allowable volt-

ages are listed in section 8, “Technical Data”,.

Note



Measurements performed close to the trigger level may result in

an incorrect display. If this is the case, select a smaller volt-

age measuring range.

In the case of measured values which are much higher than

the expected results, the input signal may be distorted. Per-

form measurement with activated 1 kHz low-pass filter in

this case.

Measurement with Low-Pass Filter

Attention!

Be aware of the fact that dangerous voltage spikes are not

displayed during this type of measurement (see also “Volt-

age Comparator”. We recommend measuring voltage with-

out the low-pass filter first, in order to be able to detect any

dangerous voltages.

A 1 kHz low-pass filter can be activate if required, in order to filter

out high frequency pulses of greater than 1 kHz, for example

when performing measurements at pulsed motor drives, i.e. un-

desired voltages of greater than 1 kHz can be suppressed.

32 GMC-I Messtechnik GmbH

V/Hz, Ω, Temperature, and A/Hz Measurements

The active low-pass filter is indicated by the FILTER display. The

multimeter is automatically switched to manual measuring range

selection.

Specified measuring accuracy is not reached with signals of

greater than 100 Hz when the filter is active.

Voltage Comparator for Displaying Dangerous Voltage

The input signal or measuring signal is checked by a voltage com-

parator for dangerous spikes, because these do not appear at the

display when the low-pass filter is used.

Where U > 45 V, a danger symbol appears at the display.

COM

Temp

Max. 600 V (< 5 kHz)

V~: 300 mV … 600 V

Hz: 5Hz … 300 kHz

Max. 100 V (> 10 kHz)

max

= 3 x 10

V x Hz

Measuring Ranges:

> 45 V:

> 600 V:

Warnings regarding dangerous voltage:

230

for U > 100 V

V~ & Filter

1kHz

Reference value

Current measured value

229

0000

FUNC

ENTER

FUNC

ENTER

229

FUNC

ENTER

FUNC

ENTER

TRMS

229

050

000

FILTER

MAN

TRMS

1kHz

00.775

050

000

GMC-I Messtechnik GmbH 33

V/Hz/dB – Ω, Temperature, and A/Hz Measurements

Alternating Voltage Level Measurement (dB)

Voltage level measurement is used in order to

ascertain overall attenuation or boosting of a

transmission system (shown here as a 4-pole

setup)

Where U

= U

REF

(reference level) = 0.775 V

Result > 1: boosting

Result < 1: attenuation

Ð Manually select the measuring range for the voltage amplitude.

When the instrument is switched to dB measurement, the pre-

viously selected voltage measuring range remains active.

Ð Repeatedly press the multifunction key FUNC | ENTER until unit

of measure dB appears at the display.

Lowest measurable frequencies and maximum allowable volt-

ages are listed in section 8, “Technical Data”,.

The level measurement function is now activated. The measured

value is calculated based upon the RMS value of the alternating volt-

age component relative to the measuring range (300 mV to 600 V),

and displayed.

The default value for the reference level is 0 dB = 0.775 V (1 mW

to 600 Ω). This value is a fixed setting and is displayed at the left-

hand auxiliary display (R:00.775 v).

Note



No terminal resistors have been integrated into the device. It

performs measurement with a high input impedance of

5MΩ.

Input impedance for voltage measurement is listed under

technical data.

In order to be able to perform correct measurement at non-

terminated devices under test, the terminating resistor must

be connected to the terminals. Be sure to take power loss at

the terminating resistor into consideration!

VoltageLevel dB[]20

------

log⋅=

34 GMC-I Messtechnik GmbH

V/Hz, Ω, Temperature, and A/Hz Measurements

5.1.3 Transient Overvoltages

The multimeters are protected against transient overvoltages of

up to 6 kV with wave-front durations of 1.2 ms and halftimes of 50

μs in the voltage measuring range. If longer pulse durations are

expected, for example when conducting measurements at trans-

formers or motors, we recommend the use of our KS30 measur-

ing adapter. It provides protection against transient overvoltages

of up to 6 kV with wave-front durations of 10, and halftimes of

1000 μs. Continuous load capacity amounts to 1200 V

RMS

. Addi-

tional influence error caused by the KS30 measuring adapter

amounts to approximately -2%.

5.1.4 Voltage Measurements at Above 600 V

Voltages of greater than 600 V can be measured with a high-volt-

age probe, e.g. the HV3

or the HV30

from GMC-I Messtechnik

GmbH. It is absolutely essential to earth the ground terminal in

this case. Observe all applicable safety precautions!

HV3: 3 kV

HV30: 30 kV, for (DC) voltages only

COM

Tem p

Voltage Measurements at Above 1000 V

with the HV3 High-Voltage Probe

Black

Red

Black

x1000

x100

GMC-I Messtechnik GmbH 35

V/Hz/dB – Ω, Temperature, and A/Hz Measurements

5.1.5 Frequency and Duty Cycle Measurement

Ð Set the rotary switch to MHz or %.

Ð Connect the measurement cables as shown.

Make sure that a current measuring range (“A”) has not been acti-

vated when the multimeter is connected for frequency or duty

cycle measurement!

Attention!

The applied signal voltage may not exceed 5 V.

Frequency Measurement, MHz

A 5 V signal with a frequency of up to 1 MHz is measured and dis-

played using MHz as a unit of measure. The pulse frequency is

the reciprocal value of the pulse period.

Duty Cycle Measurement t

The ratio of pulse duration to pulse period is measured with peri-

odic square-wave signals and is displayed as a percentage.

Note



The applied frequency must remain constant during duty

cycle measurement.

Duty cycle (%) =

Pulse duration (t

)

Pulse period (t

)

• 100

COM

Tem p

002

.00

MHz

Pulse Time Quantities

pulse frequency = 1/t

pulse duration

pulse period

– t

interpulse period

pulse or duty cycle

FUNC

ENTER

Measuring Ranges:

fp pulse frequency range

Hz t

15 Hz to 1 kHz 2 to 98%

Up to 10 kHz 5 to 95%

015

000

kHz

Max. 5 V

01.0323

36 GMC-I Messtechnik GmbH

V/Hz, Ω, Temperature, and A/Hz Measurements

5.2 Resistance Measurement Ω

Ð Disconnect supply power from the electrical circuit of the de-

vice to be measured, and discharge all high-voltage capaci-

tors.

Ð Make sure that the device under test is voltage-free. Interfer-

ence voltages distort measurement results!

Refer to section 5.1.1 regarding testing for the absence of volt-

age with the help of the direct voltage measurement.

Ð Set the rotary switch to “Ω”.

Ð Connect the device under test as shown.

Note



Use short or shielded measurement cables in the case of

high-impedance resistance.

Ω: “0 L” appears at the display in the case of an open connection.

Improving Accuracy by means of Zero Balancing

Cable resistance and contact resistance can be eliminated in all

measuring ranges by means of zero balancing (see section 4.2).

COM

Temp

0V !

000.000

300 Ω … 30 MΩ

Measuring Ranges:

GMC-I Messtechnik GmbH 37

V/Hz/dB – Ω, Temperature, and A/Hz Measurements

5.3 Continuity Test with Constant Current of 1 mA

Ð Disconnect supply power from the electrical circuit of the de-

vice to be measured, and discharge all high-voltage capaci-

tors.

Ð Make sure that the device under test is voltage-free. Interfer-

ence voltages distort measurement results!

Ð Set the rotary switch to .

Ð Connect the conductor path under test as shown.

“0 L” appears at the display in the case of an open connection.

Open circuit voltage is less than 4.5 V.

Limit Value for Volume Resistance

Depending upon the selected limit value, the multimeter gener-

ates a continuous acoustic signal in the case of continuity or

short-circuiting, i.e. at a value of less than the selected limit value.

The limit value can be adjusted in the “SET” menu (see also section

6.4):

1nFo

 ...  SET t iME  ...  bEEP

bEEP set:1, 10, 20 ... 300 Ω



in 10 Ohm steps

(10 = default setting)

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

COM

Tem p

0V !

R < 1, 10, 20 ... 300 Ω

Open circuit voltage: < 4.5 V

000.8

0.443

FUNC

ENTER

38 GMC-I Messtechnik GmbH

V/Hz, Ω, Temperature, and A/Hz Measurements

5.4 Diode Testing with Constant Current of 1 mA

Ð Disconnect supply power from the electrical circuit of the de-

vice to be measured, and discharge all high-voltage capaci-

tors.

Ð Make sure that the device under test is voltage-free. Interfer-

ence voltages distort measurement results!

Refer to section 5.1.1 regarding testing for the absence of volt-

age with the help of the direct voltage measurement.

Ð Set the rotary switch to .

Ð Acknowledge by pressing the

FUNC

| ENTER

key.

Ð Connect the device under test as shown.

Forward Direction and Short-Circuit

The instrument displays forward voltage in volts (display: 4

places). As long as voltage drop does not exceed the maximum

display value of 4.5 V, several series connected components or

reference diodes can be tested with a small reference voltage and

Z-diodes.

Reverse Direction and Interruption

The measuring instrument indicates overload: “0 L”.

Note



Resistors and semiconductor paths connected in parallel to

the diode distort measurement results!

Attention!

Observe high open-circuit voltage of 6 V during diode test-

ing: Circuits must be laid out accordingly.

COM

Tem p

Forward Direction Reverse Direction

0V !

654

Up to 4.5 V

Measuring Range:

–

0.443

000.8

FUNC

ENTER

GMC-I Messtechnik GmbH 39

V/Hz/dB – Ω, Temperature, and A/Hz Measurements

5.5 Temperature Measurement

Temperature measurement is performed with a type K thermocouple or a

type Pt100 or Pt1000 resistance sensor (accessory, not included) which

is connected to the voltage input.

Selecting the Unit of Measure for Temperature (°C = default value)

1nFo

 ...  set t iME  ...  tempunit

unit set: °C / °F



5.5.1 Measurement with Thermocouples, Temp TC

Ð Set the rotary switch to “Temp

”.

Note



The last selected temperature measurement or the last selected

temperature sensor, i.e. type K or Pt100/Pt1000, remains in

memory and is accordingly displayed. Press the

FUNC | ENTER

key in order to change to the other measuring function.

Ð Either the internal reference junction (“1tEMPintern” parameter,

see also page 52) or an external reference temperature can be

specified as the reference temperature (see page 52). The type

(“I.” for internal or “E.” for external) and temperature of the se-

lected reference junction appears at the right-hand auxiliary

display during measurement.

Note



The internal reference temperature (temperature of the inter-

nal reference junction) is measured by a temperature sensor

inside of the instrument. This may deviate somewhat from

room temperature as a result of internal heat-up, or moving

from warmer to colder surroundings or vice versa.

Ð Connect the sensor to the two accessible jacks. The instru-

ment displays the measured temperature using the selected

unit of measure.

Note



After previously performing a 10 A current measurement, the

measuring instrument should be allowed to cool down for

30 minutes before performing measurements with thermo-

couples, in order to assure that the specified accuracy levels

are achieved.

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

Temp

0023

°C

Temp

RTD

0256.0

°C

Pt1000

RTD

Measuring Range

TC K (NiCr-Ni) –270.0 … +1372.0 °C

FUNC

ENTER

COM

Tem p

40 GMC-I Messtechnik GmbH

V/Hz, Ω, Temperature, and A/Hz Measurements

5.5.2 Measurement with Resistance Sensors

Ð Set the rotary switch to “Temp

” or “Temp

RTD

”.

The last selected temperature measurement or the last selected

temperature sensor, i.e. type K or Pt100/Pt1000, remains in

memory and is accordingly displayed. Press the FUNC | ENTER key

in order to change to the other measuring function.

The sensor type, i.e. Pt100 or Pt1000, is detected automatically

and displayed.

There are two different ways to compensate for cable resistance:

Automatic Compensation

Ð Acknowledge by pressing the ZERO | ESC key.

“Short leads” appears at the display.

If you prefer to enter cable resistance directly, you can skip the

following entry prompt.

Ð Short circuit the measuring instrument’s connector cables.

“000.00” appears at the display. After pressing the FUNC | ENTER

key, automatic compensation of cable resistance is activated

for all subsequent measurements. The short-circuit can now

be eliminated, and the device is ready for use.

Entering Cable Resistance

Ð Press the ZERO | ESC key once again in the automatic compen-

sation menu.

Ð Enter the known resistance of the connector cables with the

scroll keys:

Select the digit to be changes with the





keys, and change

the respectively selected digit with the

 keys. The default

value is 0.43 Ω (Z3409). Values can be selected within a range

of 0 to 50 Ω.

Upon pressing the

FUNC | ENTER

key, the selected value is acti-

vated and the display is returned to the measuring function.

Cable resistance remains in memory even after the instrument

has been switched off.

COM

Temp

RTD

short

leads

Entering Cable Resistance

Automatic

RTD

Compensation

Measuring Ranges

RTD Pt 100 –200,0 … +850,0 °C

RTD Pt 1000 –150,0 … +850,0 °C

FUNC

ENTER

FUNC

ENTER

ZERO

ESC

ZERO

ESC

FUNC

ENTER

0023. .3

°C

22.4

0256

°C

Pt1000

rleadsmeas

rleadsset

GMC-I Messtechnik GmbH 41

V/Hz/dB – Ω, Temperature, and A/Hz Measurements

5.6 Capacitance Measurement

Ð Disconnect supply power from the electrical circuit of the de-

vice to be measured, and discharge all high-voltage capaci-

tors.

Ð Make sure that the device under test is voltage-free.

Capacitors must always be discharged before measurement is

performed. Interference voltages distort measurement results!

Refer to section 5.1.1 regarding testing for the absence of volt-

age with the help of the direct voltage measurement.

Ð Set the rotary switch to “ ”.

Ð Connect the (discharged!) device under test to the sockets

with the measurement cables as shown.

Note



The “–” pole of polarized capacitors must be connected to

the “⊥” jack.

Resistors and semiconductor paths connected in parallel to

the capacitor distort measurement results!

Note



Use of the power pack may result in significant deviations

during capacitance measurements!

Note



This function is above all intended for the measurement of

components. For telecommunication systems, it’s advisable

to use the special capacitance measurement for measure-

ments in symmetrical copper cable networks with the

METRAHIT⏐T-COM PLUS cable multimeter.

0V !

10.38

–

3 nF ... 3 mF

Measuring Ranges:

COM

Temp

–

42 GMC-I Messtechnik GmbH

V/Hz, Ω, Temperature, and A/Hz Measurements

5.7 Current Measurement

Notes Regarding Current Measurement

• The multimeter may only be operated with installed batteries or re-

chargeable batteries. Dangerous currents are otherwise not indicated,

and the instrument may be damaged.

• Set up the measuring circuit in a mechanically secure fashion, and

secure it against inadvertent breaks. Select conductor cross-sec-

tions and lay out connections such that they do not overheat.

•

An intermittent acoustic signal warns of current greater than 10 A.

An continuous acoustic signal warns of current greater than 16 A

• When measuring high current values, limit them to max. 16 A for

30 seconds or 10 A for max. 5 minutes, and allow the multimeter

to cool down for 10 minutes between measurements.

• For purposes of orientation, internal temperature in close prox-

imity to the jacks is displayed at the right-hand auxiliary display

in the 3 A and 10 A or 16 A ranges. If temperature rises to

above 50° C, you are warned by an intermittent acoustic sig-

nal.

• The input for the current measuring range is equipped with a

fuse link. Maximum permissible voltage for the measuring cir-

cuit (= rated voltage of the fuse) is 600 V AC/DC. Use specified

fuses only! The fuse must have a breaking capacity of at least

30 kA.

• If the fuse for the active current measuring range blows,

“FUSE” appears at the digital display, and an acoustic signal is

generated at the same time.

• If a fuse should blow, eliminate the cause of overload before

placing the instrument back into service!

• Fuse replacement is described in section 9.3.

• Be absolutely certain that the measuring ranges are not over-

loaded beyond their allowable capacities. Limit values are in-

cluded in section 8, “Technical Data”, in the table entitled

“Measuring Functions and Measuring Ranges” in the “Over-

load Capacity” column.

*Scope of Functions, Current Measurement, Direct Connection

Scope of Functions, Current Measurement with Current Clamp Sensor

Scope of Functions, Current Measurement with Current Clamp Transformer

Function Switch Position Measuring Range

Transformation ratio SEt menu, CliP=OFF

A DC A

300 μA

3 / 30 / 300 mA

3 / 10 A (16 A)

A AC+DC TRMS

/ Hz (A AC) A

A AC / Hz (A AC) ~ A~

Hz (A AC+DC) /

A AC+DC TRMS

Up to 30 kHz

Hz (A AC) / A AC ~ Hz

Function Switch Position

Transformation ratio SEt menu, CliP≠OFF

A DC V

A AC+DC / Hz (A AC) V

Hz (A AC) / A AC+DC Hz

A AC / Hz (A AC) V~

Hz (A AC) / A AC Hz

Function Switch Position

Transformation Ratio SEt menu, CliP≠OFF

A DC A

A AC+DC / Hz (A AC) A

Hz (A AC) / A AC+DC A

A AC / Hz (A AC) A~

Hz (A AC) / A AC Hz

GMC-I Messtechnik GmbH 43

V/Hz/dB – Ω, Temperature, and A/Hz Measurements

5.7.1 Direct and Pulsating Current Measurement, Direct Connection, A

DC and A (DC+AC)

Ð First disconnect supply power from the measuring circuit or

the power consumer, and discharge any capacitors.

Ð In accordance with the current to be measured, set the rotary

switch to A or A .

Ð Select the type of current appropriate for the measured quan-

tity by briefly pressing the multifunction key FUNC | ENTER. Each

time the key is pressed, the instrument is switched back and

forth between A DC and A (DC + AC)

TRMS

, which is indicated

by means of an acoustic signal. The current type is indicated at

the LCD by means of the DC or the (DC+AC)

TRMS

symbol.

Ð Safely connect the measuring instrument (without contact re-

sistance) in series to the power consumer as shown.

Ð Switch supply power to the measuring circuit back on.

Ð Read the display. Make a note of the measured value if the in-

strument is not being operated in the memory mode or the

transmission mode.

Ð Disconnect supply power from the measuring circuit or the

power consumer once again, and discharge any capacitors.

Ð Remove the test probes from the measuring point and return

the measuring circuit to its normal condition.

Ð Direct frequency measurement, A (DC + AC)

TRMS

(see follow-

ing section).

COM mA A

I > 10 A

300 μA / 3 mA

30 mA / 300 mA

3 A / 10 A (10 A max. 5 min)

I > 16 A

Current

Measuring Ranges:

Current measurement

may only be performed

with installed batteries!

Additional temperature display

(internal temperature at jacks)

in the 3 A and 10 A ranges

(16 A max. 30 s)

002.500

002.50

TRMS

FUNC

ENTER

24.6° C

015

000

44 GMC-I Messtechnik GmbH

V/Hz, Ω, Temperature, and A/Hz Measurements

5.7.2 Alternating Current and Frequency Measurement,

Direct Connection, A AC and Hz

Ð First disconnect supply power from the measuring circuit or

the power consumer, and discharge any capacitors.

Ð In accordance with the current or frequency to be measured,

turn the rotary switch to A~ or Hz.

Ð Select the desired measured quantity by briefly pressing the

multifunction key FUNC | ENTER. Each time the key is pressed,

TRMS

and Hz are alternately selected, and switching is ac-

knowledged with an acoustic signal.

Ð Safely connect the measuring instrument (without contact re-

sistance) in series to the power consumer as shown.

Ð Switch supply power to the measuring circuit back on.

Ð Read the display. Make a note of the measured value if the in-

strument is not being operated in the memory mode or the

transmission mode.

Ð Disconnect supply power from the measuring circuit or the

power consumer once again, and discharge any capacitors.

Ð Remove the test probes from the measuring point and return

the measuring circuit to its normal condition.

COM mA A

050.100

I > 10 A

I > 16 A

Current measurement may only

be performed with installed bat-

teries!

Current

FUNC

ENTER

300 μA / 3 mA

3 A / 10 A (10 A max. 5 min)

Measuring Ranges:

30 mA / 300 mA

Additional temperature display

(internal temperature at jacks)

in the 3 A and 10 A ranges

.500

TRMS

24.6° C

(16 A max. 30 s)

03.500

TRMS

24.6° C

015

000

GMC-I Messtechnik GmbH 45

V/Hz/dB – Ω, Temperature, and A/Hz Measurements

5.7.3 Direct and Pulsating Current Measurement with Current Clamp

Sensor, A DC and A (DC+AC)

Voltage/Current Transformer Output

When a current clamp sensor is connected to the multimeter (V in-

put), all current displays appear with the correct value in accordance

with the selected transformation ratio. The only prerequisite is that the

current sensor is equipped with at least one of the below listed trans-

formation ratios, and that the ratio has been previously selected in the

following menu

(

≠

0FF

)

(see also section 6.4).

Current Clamp Setup Menu

1nFo  ...  SET t iME  ...  CLIP

CLIP

set:1 / 10/100/1000 / 0ff 

The maximum allowable operating voltage is equal to the nominal

voltage of the current transformer.

When reading the measured

value, additional error resulting from the current clamp sensor must

also be taken into consideration

(default setting: 1:1000).

Transforma-

tion ratios:

CL IP

DMM Measuring Ranges Clamp Types

300 mV 3 V 30 V

1:1

1mV/1mA

300.00 mA 3.0000 A 30.000 A WZ12C

1:10

1mV/10mA

3.0000 A 30.000 A 300.00 A

WZ12B, Z201A/B

METRAFLEX

1:100

1mV/100mA

30.000 A 300.00 A 3000.0 A

Z202A/B,

METRAFLEX

1:1000

1 mV/1 A

300.00 A 3000.0 A 30000 A

Z202A

, Z203A

WZ12C,

METRAFLEX

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

COM

Tem p

Current

003

500

1:1000

Ri = 10 MΩ / 5 MΩ

003

1:1000

TRMS

015

000

46 GMC-I Messtechnik GmbH

V/Hz, Ω, Temperature, and A/Hz Measurements

5.7.4 Alternating Current Measurement with Current Clamp Sensor,

A AC and Hz

Voltage/Current Transformer Output

When a current clamp sensor is connected to the multimeter (V

input), all current displays appear with the correct value in accor-

dance with the selected transformation ratio. The only prerequisite is

that the current sensor is equipped with at least one of the below

listed transformation ratios, and that the ratio has been previously

selected in the following menu (

≠

0FF

) (see also section 6.4).

Current Clamp Setup Menu

1nFo

 ...  SET t iME  ...  CLIP

CLIP

set:1 / 10/100/1000 / 0ff 

The maximum allowable operating voltage is equal to the nominal

voltage of the current transformer.

When reading the measured

value, additional error resulting from the current clamp sensor must

also be taken into consideration

(default setting: 1:1000).

Transforma-

tion ratios:

CL IP

DMM Measuring Ranges Clamp Types

300 mV 3 V 30 V

1:1

1mV/1mA

300.00 mA 3.0000 A 30.000 A WZ12C

1:10

1mV/10mA

3.0000 A 30.000 A 300.00 A

WZ12B, Z201A/B

METRAFLEX

1:100

1mV/100mA

30.000 A 300.00 A 3000.0 A

Z202A/B,

METRAFLEX

1:1000

1 mV/1 A

300.00 A 3000.0 A 30000 A

Z202A

, Z203A

WZ12C,

METRAFLEX

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

003.50

TRMS

1:1000

050.00

1:1000

FUNC

ENTER

COM

Tem p

Current

Ri = 5 MΩ

050

015

000

= 5 M

GMC-I Messtechnik GmbH 47

V/Hz/dB – Ω, Temperature, and A/Hz Measurements

5.7.5 Alternating Current Measurement with Current Clamp Transformer,

A AC and Hz

Current/Current Transformer Output

When a current clamp transformer is connected to the multimeter

( mA/A input), all current displays appear with the correct value

in accordance with the selected transformation ratio. The only

prerequisite is that the current transformer is equipped with at

least one of the below listed transformation ratios, and that the

ratio has been previously selected in the following menu (Cl ip ≠

0FF) (see also section 6.4).

Current Clamp Setup Menu

1nFo

 ...  SET t iME  ...  CLIP

CLIP

set:1 / 10/100/1000 / 0ff 

(default setting: Cl ip = 0FF)

Transforma-

tion ratios:

CL IP

DMM Measuring Ranges Clamp Types

30 mA AC 300 mA AC 3 A AC *

1:1

1mA/1mA

30.000 mA 300.00 mA 3.0000 A

WZ12A, WZ12D,

WZ11A, Z3511,

Z3512, Z3514

1:10

1mA/10mA

300.00 mA 3.0000 A 30.000 A

1:100

1mA/100mA

3.0000 A 30.000 A 300.00 A

1:1000

1 mA/1 A

30.000 A 300.00 A 3000.0 A

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

1:1000

003.50

TRMS

050.100

FUNC

ENTER

003.50

COM

Temp

Current

1:1000

TRMS

FUNC

ENTER

≡

50 m

, 0,65

, 5,5

00000

TRMS

055

000

24.6° C

Additional temperature display

(internal temperature at jacks)

in the 3 A range

48 GMC-I Messtechnik GmbH

Device and Measuring Parameters

6 Device and Measuring Parameters

The instrument’s “SET” mode (menu mode) makes it possible to

set operating and measuring parameters, query information and

activate the interface.

Ð The menu mode is accessed by pressing the MEASURE | SETUP

key, assuming that the instrument is switched on and set to

“Measure” (measuring mode operation). “1nFo” appears at the

display.

Ð By repeatedly pressing the

  key (in any direction), ac-

cess is gained to the following main menus: “store”, “ send” and

“set”, and the display is finally returned to“1nFo”.

Ð After selecting the desired main menu, the respective sub-

menu is accessed by pressing the FUNC | ENTER key.

Ð The desired parameter is selected by repeatedly pressing the

 key.

Ð In order to check or change a parameter, acknowledge it with

the FUNC | ENTER key.

Ð The

  keys can be used to position the cursor at the entry

position. The desired value is selected with the help of the 

keys.

Ð Changes can only be applied with the FUNC | ENTER key.

Ð After pressing the ZERO | ESC key, the display is returned to the

submenu without making any changes, and by pressing the

ZERO | ESC key once again, to the main menu etc.

Ð You can switch to the measuring mode from any menu level by

pressing the MEASURE | SETUP key.

After repeatedly pressing the MEASURE | SETUP key (without first

turning the multimeter off), you can return to the last selected

menu or parameter from the measuring mode.

Example: Setting Time

1nFo  ...  set  ...  t iME ... set

10:24:48 (hh:mm:ss)

 

Setting hours and minutes:

 

Advance to desired entry position.

 Change the setting, the entry position blinks.

Press and hold the key

to change the setting rapidly.

The new time setting is activated after acknowledg-

ment.

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

GMC-I Messtechnik GmbH 49

Device and Measuring Parameters

6.1 Paths to the Various Parameters 6.2 List of All Parameters

bAtt:

0CCvP:

dAtE

/t iME:

caldat/

uer

tEMPintern:

1nFo

SEnd

SET

StorE

StArt

StoP

000.0

CLEAr

StArt/

StoP

hyst

rate

trig

.store

Submenus / parameters ↓

time

date

addr

Com ir

irStb

apoff

Clip

beep

tempunit

tempintern

beeper

Main Menus →

Query Set

Set

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

1nfo

MEASURE

SETUP

020

TRMS

Acknowledge

FUNC

ENTER

Acknowledge

FUNC

ENTER

Acknowledge

FUNC

ENTER

Com bt

bt pin

M248B:

Parameter

Page: Header

Addr

57: Configuring Interface Parameters

APoFF

51: APoFF – Specified Time for Automatic Shutdown and Continuous ON

bAtt 50: bAtt – Query Battery Voltage

bEEP 52: bEEP – Set Limit Value for Continuity Testing

beeper on

off

52: bEEPEr on/oFF – Activate/Deactivate Acoustic Signals

bt pin

57: bt Pin – Allocating the pin for the Bluetooth interface (M248B)

caldat 50: cALdAt – Query Calibration Date

CLEAr

24: Measurement Data Recording

CLiP 45: Direct and Pulsating Current Measurement with Current Clamp Sen-

sor, A DC and A (DC+AC)

Com bt 57: Interface Selection for METRA HIT ULTRA BT (M248B)

CoM ir 57: Interface Selection for METRA HIT ULTRA BT (M248B)

dAtE 50: dAtE – Query Date, 51: dAtE – Enter Date

EMpty

24: Measurement Data Recording

hyst

53: HYSt – Hysteresis (parameter for memory mode operation)

1nfo 50: Querying Parameters – InFo Menu

irStb

57: Configuring Interface Parameters

1tEMP 50: ItEMP intErn – Query Reference Temperature

0CCvP

24: Measurement Data Recording

rAtE

53: rAtE – Set Transmission and Storage Rate

SEnd 56: Activating the Interface

SET 51: Entering Parameters – SETUP Menu

StArt

24: Measurement Data Recording

StoP

store

temp intern 50: ItEMP intErn – Query Reference Temperature

temp unit 52: tEMP unit – Select a Unit of Measure for Temperature

t iME 50: tiME – Query Time, 51: tiME – Set Time

trig 54: triG – Trigger Conditions (parameters for memory mode operation)

tstore 54: tStorE – Recording Time (parameter for memory mode operation)

uEr

50: vErSion – Query Firmware Version

50 GMC-I Messtechnik GmbH

Device and Measuring Parameters

6.3 Querying Parameters – InFo Menu

bAtt – Query Battery Voltage

1nFo bAtt 2.9 V.

OCCUP – Query Memory Occupancy

1nFo

bAtt



...



0CCvP

000

dAtE – Query Date

1nFo bAtt



...



2012 (DD.MM. YY)

D = day, M = month, Y = year

Date and time must be reentered after replacing the batteries.

tiME – Query Time

1nFo

bAtt



...



(hh:mm:ss)

h = hours, m = minutes, s = seconds

Date and time must be reentered after replacing the batteries.

cALdAt – Query Calibration Date

1nFo bAtt



...



caldat 20.06.12

vErSion – Query Firmware Version

1nFo bAtt



...



VEr 0.22

ItEMP intErn – Query Reference Temperature

The temperature of the internal reference junction is measured

with a temperature sensor in close proximity to the input sockets.

1nFo bAtt



...



tEMP

intern

24,7

°C

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

GMC-I Messtechnik GmbH 51

Device and Measuring Parameters

6.4 Entering Parameters – SETUP Menu

tiME – Set Time

Entering the correct time makes it possible to acquire measured

values in real-time.

1nFo  ...  SET t iME

t iME SET: 10:24:18 (hh:mm:ss)  

Date and time must be reentered after replacing the batteries.

dAtE – Enter Date

Entering the current date makes it possible to acquire measured

values in real-time.

1nFo

 ...  SET t iME  ...  dAtE

datE SET: 20.06 (DD: day . MM: month)

 

year SET: 2012 (YYYY: year)

 

Date and time must be reentered after replacing the batteries.

Addr – Set Device Address

See section 7.2 on page 57.

irStb – Status of the Infrared Receiver in the Stand-By Mode

See section 7.2 on page 57 regarding settings.

CoM ir / CoM bt – Interface Operating System Infrared / Bluetooth

Refer to section 7.2 on page 57 for instructions on switching bet-

ween the two systems.

bt pin – Pin for Bluetooth Interface

Refer to section 7.2 on page 57 on setting instructions.

APoFF – Specified Time for Automatic Shutdown and Continuous ON

The instrument is switched off automatically if the measured value

remains unchanged for a long period of time and if none of the

keys or the rotary switch have been activated before the specified

time “APoFF” (entered in minutes) has elapsed.

If the on setting is selected, the multimeter is set to continuous op-

eration and

ON appears in the display to the right of the battery

symbol. In this case, the multimeter can only be switched off

manually. The “on” setting can only be canceled by changing the

respective parameter, or by switching the instrument off manually.

In this case, the parameter is reset to 10 minutes.

1nFo

 ...  SET t iME  ...  APoFF

APoFF SET: 10 ... 59 min on



(10 minutes = default setting)

Note



The auto power off function (APoFF parameter) is deactivated

when dangerous touch voltage is applied.

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

52 GMC-I Messtechnik GmbH

Device and Measuring Parameters

CLiP – Set Transformation Ratio (current clamp factor)

See section 5.7.3 ff.

bEEP – Set Limit Value for Continuity Testing

1nFo

 ...  SET t iME  ...  bEEP

bEEP SET: 1, 10, 20 ... 500 Ω 

(10 Ω = default setting)

tEMP unit – Select a Unit of Measure for Temperature

1nFo

 ...  SET t iME  ...  temp unit °C

unit SET: °C / °F 

(°C = default setting)

tEMP intErn/ExtErn – Select Internal or External Reference Junction

External Reference Junction: Specified Temperature

1nFo

 ...  SET t iME  ...  tEMP intern

tEMP set: tEMP intern / tempextern



extern set: 000 .0 °C



(internal reference = default setting)

bEEPEr on/oFF – Activate/Deactivate Acoustic Signals

1nFo

 ...  SET t iME  ...  beeper off

beeper set: on / off



(bEEPEr on = default setting)

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

GMC-I Messtechnik GmbH 53

Device and Measuring Parameters

6.5 StorE Menu – Parameter for Memory Mode Operation

HYSt – Hysteresis (parameter for memory mode operation)

The hysteresis setting allows for efficient use of memory space.

During memory mode operation, new measured data are only

saved if they deviate from the previously stored value by an

amount which exceeds the selected hysteresis value.

Hysteresis can be selected in steps from 1 to 10,000 digits. These

digits are related to the measuring range as follows: The position

of the set digit in the specified hysteresis value corresponds to the

same position within the measuring range, although counting is

started at the left.

Example: A specified hysteresis of 00100 for the 600.00 V mea-

suring range means that only those measured values which devi-

ate from the last measured value by more than 001.00 V are

saved to memory.

Note



Due to the fact that the value is specified in digits (highest

place all the way to the left), and thus depends on the mea-

suring range, it’s advisable to use the function with a fixed

measuring range only.

1nFo  ...  store  ...  hyst

hyst set: 00000 ... 10000

 

rAtE – Set Transmission and Storage Rate

The sampling rate specifies the time interval after which the

respective measured value is transmitted to the interface, or to

measured value memory.

Any one of the following sampling rates can be selected:

[mm:ss.

] 00:00.1, 00:00.2, 00:00.5, 00:01.0, 00:02.0, 00:05.0

[h:mm:ss.

] (h = hours, m = minutes, s = sec.,

0 = tenths of a sec.

)