Scope of Application:The ST-2000 Intelligent Cable Fault Detector is used to measure various power cables, high-frequency coaxial cables, local telephone cables, and underground wires laid evenly in pairs or more, with different cross-sections and different media, for faults such as high and low resistance, short circuit, open circuit, broken wire, as well as high-resistance leakage and high-resistance flashover faults.
Working Modes: Low-voltage pulse, DC high-voltage flashover, and impulse high-voltage flashover.
Sampling Rate: 25MHz.
Internal Transmitted Pulse Width and Amplitude: 0.2us, 100-120V; 2us, 150-160V.
Storage Capacity: 8Kbyte, can be divided into two storage areas to store and display two sampled waveforms for comparative measurement.
Display Resolution: V/50m, where V is the propagation speed in m/us.
Display Mode: 320×240 LCD with backlight.
Printing Method: A micro printer is installed on the main panel of the machine to record test date and test waveform data.
Power Supply and Consumption: AC 200V ±10% or internal DC power supply, power consumption not exceeding 10W; DC 6V (7AH) power consumption not exceeding 6W.
Dimensions: 300×400×180mm (length×width×height).
Section 2: Instrument Panel and Operation Functions
The panel and keyboard layout of the high-voltage cable fault tester is shown in Figure (2):
Computer USB Communication Port: Currently only used by professional production and technical personnel for debugging and program entry.
Instrument Indicator Lights: Respectively for charging, undervoltage, and pulse width (0.2/2).
Input/Output Socket: The instrument uses a BNC-50KY (Q9) socket, connecting cables for test signal input and output.
Input Amplitude: Used to adjust the amplitude of input and output pulses. It should be adjusted according to the waveform displayed on the screen during use. If adjusted too small, the pulse reflection is very small, and sampling may even fail, as shown in Figure (3). If adjusted too large, the reflected pulses connect with the baseline without intersection, or the baseline may become a slanted line, as shown in Figure (4). Generally, before sampling, rotate the input amplitude knob to about 1/3, then adjust according to the waveform size and resample.
Contrast Adjustment Knob: Adjust this knob to make the text display clear, without streaks and with a clean background.
Pulse Width Selection Button: When the button is up, the instrument outputs a 0.2uS pulse; when pressed, it outputs a 2uS pulse. In actual cable testing, generally use 0.2uS first; if there is no reflection or the reflection is too small, then use 2uS.
Power Switch: The instrument uses a switch with indicator light.
Display Screen: The instrument uses a 320×240 dot matrix LCD with backlight, used to display operation menus, test waveforms, test results, dates, etc.
Micro Printer: This instrument uses a 4-pin 24-line micro printer for printing test waveforms, test data, and test dates.
SEL Key: Self-test key. Press this key to print self-test data parameters, used to check the printer head and drive circuit condition.
LP Key: Paper feed key. Press this key to activate the paper feed mechanism and stop the print pins. Use this key when replacing printer paper.
Note: The above information and technical parameters are compiled and released by Yangzhou DARUI Electric Co., Ltd.
