Manual Gossen Metrawatt Profitest Intro (page 13 of 62) (English)

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GMC-I Messtechnik GmbH 13

Measurement of Touch Voltage via Finger Contact

When a measurement is started and if you touch the ON/START key

with your finger, the test instrument detects whether or not dan-

gerous touch voltage Ub is present at the PE terminal relative to

ground.

Error in the U Switch Position:

PE appears and the LIMIT LED lights up red.

Error in All Switch Positions Other than U:

The test instrument disables the measurement and the following

message appears: U.PE > UL!

Prerequisites for reliable finger contact measurement:

1 Nothing is plugged into the interfaces and the charging cable

is not plugged in.

2 Based on his standing surface, the user has an earth resis-

tance of R.eb < 1 MΩ.

3 While starting the measurement, the user touches the “ON/

START” key with the full surface of an unprotected finger with

direct skin contact.

Insufficient Supply Voltage

If (rechargeable) battery voltage falls below the allowable limit value

the instrument cannot be switched on, or it is immediately

switched off.

Conditions Resulting in Disabling and Abortion of Measurements

The measurement is interrupted automatically or the measuring

sequence is blocked (except for voltage measuring ranges and

phase sequence testing) in the event of:

• Impermissible line voltages (< 60 V, > 253 V / > 330 V /

> 440 V or > 550 V) for measurements which require line volt-

age

• Interference voltage during insulation resistance or low resis-

tance measurements

• Overheating at the instrument.

As a rule, excessive temperatures only occur after approxi-

mately 50 measurement sequences at intervals of 5 seconds,

when the rotary selector switch is set to the ZL-PE or ZL-N

position.

If an attempt is made to start a measuring sequence, an

appropriate message appears at the display panel.

Automatic Instrument Shutdown

The instrument only switches itself off automatically after comple-

tion of an automatic measuring sequence, and after the predeter-

mined on-time has expired (see section 4.2). On-time is reset to

its original value as defined in the setup menu as soon as any key

or the rotary selector switch is activated.

The instrument remains on for approximately 75 seconds in addi-

tion to the preset on-time for measurements with rising residual

current in systems with selective RCDs.

The instrument always shuts itself off automatically, unless the fol-

lowing setting has been selected in SETUP: “>>>>>” (continuous

on).

5.3 Measurement Value Display and Memory

The following items appear at the display panel:

• Measured values with abbreviations and units of measure

• Selected function

• Nominal voltage

• Nominal frequency

• Error messages

Measurement values for automatic measuring sequences are

stored and displayed as digital values until the next measurement

sequence is started, or until automatic shut-off occurs.

If the upper range limit is exceeded, the upper limit value is dis-

played and is preceded by the “>” symbol (greater than), which

indicates measurement value overrun.

Note

The depiction of LEDs in these operating instructions

may vary from the LEDs on the actual instrument due to

product improvements.

5.4 Testing Earthing Contact Sockets for Correct Connection

The testing of earthing contact sockets for correct connection

prior to protective measures testing is simplified by means of the

instrument’s error detection system.

The instrument indicates improper connection as follows:

•Non-allowable line voltage (< 60 V or > 253 V):

The MAINS/NETZ LED blinks red and the measuring sequence is

disabled.

•Protective conductor not connected or potential to earth ≥ 50 V at

≥50 Hz (switch position U – single-phase measurement):

If the contact surface of the START key is touched (finger con-

tact) while PE is being contacted (via the country-specific

measuring adapter, e.g. Z503K PRO-Schuko measuring

adapter as well as via the test probe in the case of 2-pole

measurement with the Z503L KS-PROFITEST INTRO), PE

appears (only after starting e test sequence). The MAINS LED

blinks red as well.

•Neutral conductor N not connected (during mains dependent

measurements):

The MAINS/NETZ LED blinks green

•One of the two protective contacts is not connected:

This is checked automatically during testing for touch current

UIΔN. Poor contact resistance at one of the contacts leads to

one of the following displays depending upon poling of the

plug:

–Display in the connection pictograph:

PE interrupted (x), or bottom protective

conductor tab interrupted with reference

to the keys at the test plug

Cause:

voltage measuring path interrupted

Consequence: measurement is disabled

–Display in the connection pictograph:

Top protective conductor tab interrupted

with reference to the keys at the test plug

Cause: current measuring path interrupted

Result: no measured value display

Note

See also “LED Indications, Mains Connections and

Potential Differences” beginning on page 43.

Attention!

Reversal of N and PE in a system without RCCBs cannot

be detected and is not indicated by the instrument.

In a system including an RCCB, the RCCB is tripped

during “touch voltage measurement without RCCB trip-

ping” (automatic ZL-N measurement), insofar as N and

PE are reversed.

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Gossen Metrawatt Profitest Intro Manual

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