Description of the cable fault testing system:
(1) Under-voltage indication: When the internal battery voltage of the instrument is too low, the under-voltage indicator light will come on. At this point, the instrument needs to be charged.
(2) Charging indicator: After plugging in the 220V AC power supply, the charging indicator light comes on, indicating that the instrument is currently charging. When the indicator light goes off, it means that the battery is fully charged.
(3) Pulse Width Indication: Press the “Pulse Width” button, and a green light lasting for 0.2 seconds will illuminate on the panel, indicating that the pulse width has been set to 0.2 seconds. Press the “Pulse Width” button again, and the green light for 0.2 seconds on the panel will go out, indicating that the pulse width has been set to 2 seconds.
(4) Signal Input: Used for sampling box signal input.
(5) Power socket: This instrument is powered by a 50Hz, 220V AC power supply. It is used during charging and testing. When plugged in, the instrument enters the charging state. Once the battery is fully charged, the instrument automatically undergoes protection.
(6) Power switch: When the switch is set to “ON”, the instrument will start; otherwise, it will be off.
(7) Gain adjustment: This is used to adjust the amplitude of the input and output pulses. During 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 small, or even sampling cannot be performed. As shown in Figure 3. If the adjustment is too large, the reflected pulse will be connected without intersecting the baseline, or the baseline will 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 based on the size of the waveform, and then re-sampling.
Figure 3: Waveform diagram with too small adjustment
Figure 4: Waveform diagram with too large adjustment
(8) Operating Keyboard: It features soft-touch buttons for performing various operations on the instrument. For detailed information, please refer to “Keyboard Function Description”.
(9) Backlight adjustment: When the display contrast is too dim or too bright, adjust the potentiometer here to set the contrast to the appropriate level.
(10) Display screen: Used for displaying the interface of the instrument.
Post time: May-12-2026