Instructions for Cable Fault Testing System

Instructions for Cable Fault Testing System:
(1) Low voltage indication: When the internal battery voltage of the instrument is too low, the low voltage indicator light will be on, and the instrument needs to be charged at this time.
(2) Charging indication: After plugging in the AC 220V, the charging indicator light will turn on, indicating that the instrument is charging at this time. When the indicator light goes off, it indicates that the battery is fully charged.
(3) Pulse width indication: Press the “Pulse Width” key, the 0.2s green light on the panel will light up, indicating that the pulse width is selected as 0.2s. Press the “Pulse Width” key again, the 0.2s green light on the panel will go off, indicating that the pulse width is selected as 2s.
(4) Signal Input: Used for signal input of the sampling box.
(5) Power socket: This instrument is powered by a 50Hz, 220V AC power supply. It is used during charging and path testing. When the power is plugged in, the instrument is in the charging state. Once the battery is fully charged, the instrument automatically enters protection mode.
(6) Power switch: When the switch is set to “ON”, the instrument is turned on; when it is set to “OFF”, the instrument is turned off.
(7) Gain adjustment: It is used to adjust the amplitude of the input and output pulses. When in use, it should be adjusted according to the waveform displayed on the screen. If the adjustment is too small, the pulse reflection will be very weak, and even sampling may not be possible, as shown in Figure 3. If the adjustment is too large, the reflected pulses will be connected without intersecting the baseline, or the baseline may even become a slanted line, as shown in Figure 4. Generally, before sampling, the gain adjustment knob should be rotated about 1/3, and then adjusted again according to the waveform size and re-sampled.
Figure 3 Waveform diagram with too small adjustment Figure 4 Waveform diagram with too large adjustment
(8) Operating the keyboard: It features light touch keys for performing corresponding operations on the instrument. For detailed information, please refer to “Keyboard Function Description”.
(9) Backlight adjustment: When the contrast of the display screen is too dark or too bright, adjust the potentiometer here to set the contrast to a suitable state.
(10) Display screen: Used for the interface display of the instrument.