Contact Loop Resistance Tester - Yangzhou Darui - Yangzhou Darui Electric Co., Ltd.

Automatic Dielectric Loss Tester - Yangzhou Darui

Contact Loop Resistance Tester - Yangzhou Darui

Published: 2020-08-05 08:51:39

产品价格：0.00

Category: Loop Resistance Tester

Product Description

Contact Loop Resistance Tester

Darui Electric recommends：

GHHL接触回路电阻测试仪又称回路电阻测试仪还称大电流微欧计。是高、低开关、电缆电线及焊缝接触电阻的专用测试仪器。其电流采用国家标准GB736所推荐的标准电流，可在标准电流的情况下测得被试品的电阻值。本仪器具有体积小、重量轻、抗干扰能力强、精度高、操作方便、保护功能完善等特点。符合电力、供电部门现场高压开关维修和高压开关厂回路电阻测试的要求。

Types and Applications

Earth resistance meter: suitable for direct measurement of grounding resistance of various devices, also for general low resistance measurement. The 4-terminal (0~1~10~100Ω specification) model can also measure soil resistivity.

Single-Clamp Loop Resistance Tester

Unique single-clamp design avoids dual-clamp probe interference. No auxiliary ground stake needed — clamp and measure directly.

Universal Ground/Insulation Resistance Tester

Multiple test methods: dual-clamp ground resistance, 4-pole ground resistance, soil resistivity, insulation resistance, AC/DC resistance, current RMS testing.

Ground Impedance Tester

Clamp-type earth resistance meter: no auxiliary ground rods needed, no need to disconnect the equipment ground. Simply clamp onto the ground wire or rod to measure ground resistance down to 0.1Ω. Can also measure current.

Loop Resistance Tester

Microprocessor controlled for high accuracy and reliability. Three LED indicators for wiring status. Direct reading of short-circuit protection current and ground fault current. Auto-lock on overheating.

Digital Ground Resistance Tester

Specialized for measuring ground resistance of electrical equipment, lightning rods, etc. All-electronic instrument with key circuits using Texas Instruments ICs. Advanced testing principle.

Double-Clamp Ground Resistance Tester

Multiple ground resistance measurement methods: no auxiliary electrode / 3-pole / 4-pole / 2-pole — suitable for various measurement environments. Wide measurement range: 0.002Ω–300KΩ — meets diverse requirements.

Ground Resistance Tester

Working Principle

The loop resistance tester uses PWM high-frequency switching power supply to provide >100A test current. When measurement is triggered, the HF switching power supply outputs >100A test current while the sampling circuit begins sampling. The signal is amplified, converted from analog to digital by A/D converter, then filtered, computed, and processed by the microprocessor, finally displaying current and resistance values. After 10 seconds, the system auto-resets. When measured loop resistance is <400μΩ, minimum resolution is 0.1μΩ; when >400μΩ, minimum resolution is 1μΩ.

Switch Loop Resistance Tester — Test Principle:

1. 50Hz AC rectified to 15KHz HF power, then transformed to LV DC. Feedback from voltage drop across load. PWM technology achieves automatic constant current.

2. 100A DC test current through DUT produces voltage drop. Internal reference resistor provides comparison. Higher accuracy than conventional bridge testing.

Note: The above information and technical parameters are compiled and published by Yangzhou Darui Electric Co., Ltd.

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