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be calibrated to ensure the accuracy of fault measurement. The
calibration method is as follows:
1) Prepare a standard cable same type as the cable under test;
2) Connect the standard cable to the output port of the tester;
3) Turn on the instrument power switch;
4) Choose the impulse mode, the upper right corner of the screen
shows "impulse";
5) Adjust the measurement range more than or equal to the length
of the standard cable;
6) Press the "impulse" button to send the test pulse, the screen to
get reflected waves;
7) Press the
►
button to move the cursor to the start of the
reflected wave. If the reflected wave is not well discriminated,
adjust the “waveform control” knob to change the amplitude of the
waveform and then retransmit the pulse;
8) Modify the wave speed until the measured distance is equal to
the length of the standard cable, and then note the value for use.
3. fault test
1) Low voltage impulse method
A. Disconnect all equipment from the cable under test
B. Connect the cable under test to the output port of the tester.
C. Turn on the power.
D. Choose the impulse mode.
