Manual Gossen Metrawatt METRALINE ISO-CHECK (page 4 of 8) (English)

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4 GMC-I Messtechnik GmbH

3 Performing Measurements

3.1 Switching the Instrument On and Off, Energy-Saving

Mode, Automatic Shutdown

The instrument is switched on by pressing and holding the START

key. Briefly press the START key twice in order to switch the instru-

ment off, during which no voltage may be applied to the test

probes! The instrument is switched to the standby mode after

several seconds (reduced brightness), if none of the keys has

been pressed and no voltage is applied to the test probes. The

instrument is switched out of the standby mode (i.e. back to full

brightness) by pressing any key or applying voltage to the test

probes. The instrument is shutdown automatically if it has

remained inactive for about 1 minute, i.e. if no keys have been

pressed and no voltage has been applied to the test probes dur-

ing this time.

3.2 Instructions and Principles with Validity for

All Measurements

• The desired functions or parameters are selected with the

ISO/USPD, FUNC, UTEST ▲ and UTEST ▼ keys. Measurement is

triggered by pressing the START key. All selected functions or

parameters remain valid until they are changed.

• If (interference) voltage of greater than 10 V is applied to the

test probes, this is indicated at the display in the UIN field

along with the measured value, as well as the “!” symbol. If

this is the case, the START key is disabled.

Bild 3.1 (Interference) Voltage Display

• If battery voltage is too low (only the red field is lit up in the

battery symbol), measurement cannot be started. After press-

ing the START key, the depleted battery symbol appears for

about 1 second (see figure below). Replace the batteries as

described in section 5.1 on page 7.

➭ When measuring high insulation resistance, the measurement

cables should be laid unobstructed in the room, or placed

upon a material with good insulating properties.

➭ Contact the device under test with the test probe before trig-

gering measurement with the START key, thus causing any

possible interference voltage to appear at the display.

➭ Do not remove the test probes prematurely during the course

of the measurement, because this may lead to distorted mea-

surement results.

After insulation measurement has been completed, any remaining

residual voltage is displayed as U

IN , which may result from cable

capacitance. Contact to the device under test must be main-

tained for as long as a capacitive DUT is being discharged via the

test instrument’s internal resistor. The falling voltage value can be

observed directly at the U

IN display. Do not disconnect the DUT

until voltage U

IN is less than 25 V!

3.3 Measuring Functions

Attention!

• Each time before measuring insulation resistance or surge

protection, make sure that the device under test is voltage-

free!

• Do not touch the device under test or the test probes during

measurement, and for a short time thereafter as long the DUT

is being discharged.

• The DUT may be charged with as much as 1000 V during

measurement, for which reason contact to the DUT must be

maintained after measurement has been completed until it is

fully discharged! Residual voltage appears at the display along

with the “!” warning symbol.

• Do not remove the test probes until voltage has dropped to a

safe level and the “!” warning symbol has been cleared from

the display.

• All consuming devices must be disconnected and the

switches must be turned on when measuring insulation resis-

tance between conductors.

3.3.1 Voltage Measurement

➭ Connect the test instrument to the device under test.

Figure 3.4: Connection Example for Voltage Measurement

• If a voltage of greater than about 10 V is present in the mea-

sured electrical circuit, its value is displayed in the U

IN field and

the “~” symbol appears for AC or polarity is displayed for DC.

The “+” symbol lights up if the positive pole is connected to

the fixed test probe, and “–” appears if the negative pole is

connected to the fixed test probe. “!” appears at the same

time as a warning. The START key is disabled!

Figure 3.2: Low Battery

Voltage

Figure 3.3: Low Battery

Voltage: Display

After Pressing the

START Key

Figure 3.5: Display of (Inter-

ference) Voltage

(Riso function)

Figure 3.6: Voltage

Measurement

SPD function)

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