Portable Surge Protective Device Tester
Ⅲ
. Precise Test and Calibration of MOV Leakage Current
1. Function Selection
Choose FUNCTION 3
2. Testing
Press TEST button, release the button when a BEEP sounds.
3. Read the test data
The screen displays the break-over voltage of the tested MOV-type SPD, and then followed by the display of the leakage
current under 75% of the break-over voltage every 1 second.
4. Precise testing of leakage current
In this mode, the constant voltage is 75% of the break-over voltage outputs. Read the accurate leakage current value of
the MOV type SPD.
7. Exit to the standby mode
In the alternate display mode, press the TEST button, release the button when hearing a sound of "Beep". The screen will
be cleared to "0" and exit the test to return to the standby mode.
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5. The calibration of 75% of the break-over voltage value
The characteristics of MOV and the error of 75% of the break-over voltage may
have a great influence on the accuracy of the leakage current.
1) Choose a multimeter "Fluke 87V" or any other multimeter with an accuracy
of 0.1V.
2) Connect the multimeter probes in parallel with the SPD and the test pens.
3) In this mode, the constant voltage is 75% of the break-over voltage outputs.
The tester screen continually and alternately displays 75% of the break-over
voltage value and the leakage current value as well.
4) Open the tester and adjust the tester R14(Potentiometer) to make the
multimeter display the same value as that the tester. At this point, the
calibration of 75% of the break-over voltage is completed.
6. The calibration of leakage current
1) Choose a multimeter "Fluke 87V" or any other multimeter with the accuracy
of 0.1μA.
2) Connect the multimeter probes in series with the SPD and the test pens.
3) In this mode, the constant voltage is 75% of the break-over voltage outputs.
The tester screen continually and alternately displays 75% of the break-over
voltage value and the leakage current value as well.
4) Open the tester and adjust the tester R17(Potentiometer) to make the
multimeter display the same value as the tester. At this point, the calibration of
the leakage current is completed.
