Bedienungsanleitung Gossen Metrawatt METRALINE ISO-CHECK (Seite 6 von 8) (Englisch)

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6 GMC-I Messtechnik GmbH

If the symbol is included in the description of the surge pro-

tection device, the manufacturer’s instructions must be observed

for the respective device type.

The actual measurement is performed as follows:

➭ Select measurement of surge protection devices with the

ISO/USPD key, and select the desired sub-function with the

FUNC key (see also description above). Example:

Figure 3.11: Surge Protection Device Measurement Menu,

DC Function

➭ Connect the test probes to the surge protection device in ac-

cordance with the manufacturer’s instructions.

Figure 3.12: Connection Example

Note

If a voltage of greater than about 10 V is present at the measured

surge protection device, its value is displayed and the START key is

disabled (see section 3.3.1 on page 4). Eliminate the source of

interference voltage before restarting the measurement.

➭ Trigger measurement by pressing the START key. Release the

START key as soon as measurement is started. Rising current

at the surge protection device is displayed by means of a bar

graph. At the same time, the measuring voltage value appears

at the display in the U

IN field. Measurement is ended automat-

ically.

➭ Read voltage measured at the milliampere point.

Note

The device under test may not be disconnected from the

test instrument as long as the “!” warning symbol is lit up.

After insulation measurement has been completed, any remaining

residual voltage is displayed as UIN, which may result from cable

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

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

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

be observed directly at the UIN display. Do not disconnect the

DUT until voltage U

IN is less than 25 V!

Comments

• Before measuring surge protection devices, disconnect them

from the installation.

• It’s advisable to study the circuit before performing measure-

ment. Surge protection devices are currently equipped with

integrated interference suppression filters and the like, which

may influence measurement results.

3.4 Further Device Functions

Select Language, Query Firmware Version

Before selecting a language or querying the firmware version, dis-

connect both test probes from the device under test / measuring

circuit and switch the test instrument off.

➭ Press and hold the R

ISO/USPD key while switching the test in-

strument on.

The firmware version and other service information appears at the

display, as well as the language selection menu.

➭ Select the desired language with the corresponding key

(EN = English, CZ = Czech).

Figure 3.15: Language Selection Menu

The instrument is switched back to normal operation after a lan-

guage has been selected.

Measuring Point Illumination with White LED

The LED can be switched on and off by briefly pressing the START

key.

Note

No voltage may be applied to the test probes.

Figure 3.13: Sample Results

for the USPD

Measurement

(discharging is

active: residual

voltage = 144 V)

Figure 3.14: Further Sample

Results for the

SPD Measure-

ment (DUT is fully

discharged: resid-

ual voltage = 0 V)

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