Loop Resistance Tester
Darui Electric recommends：
Loop Resistance Tester complies with Preventive Test Regulations DL/T 596-1996.，Conductive loop resistance testing requires ≥100A for all switchgear. Oxidation and poor contact increase resistance; high current heats contacts, accelerating oxidation and further increasing resistance, potentially causing serious accidents. Regular or periodic contact resistance measurement is therefore essential.
Loop Resistance Tester (also called Contact Resistance Tester). Per new regulations, loop resistance measurement requires ≥100A test current.
Technical Parameters
1. Measurement Range: 0~4mΩ (50A) 0~2mΩ (100A) 0~1.33mΩ (150A) 0~1mΩ (200A)
2. Test Current: DC 50A/100A/150A/200A fixed output
3. Accuracy: ±(0.5% rd+2d)
4. Continuous Runtime: 5s-599s
5. Display: Large Chinese LCD
6. Communication: RS232 Serial
Power: AC220V±10%, 50Hz
8. Power: 1200W
Operating Procedure
1. Connect per 4-terminal method.
2. Power on.
3. Press measurement key. If current display <100A, fine-tune via current adjustment.
4. Save data after measurement.
5. Power off after measurement.
6. Handle test clamps with care.
Instructions
1. Use 4-wire method with dedicated test leads.Connect the test objectto the instrument panel. Ensure voltage measurementleads are connected inside the current output leads.
Connect power (3rd wire must be grounded). Power on: displays 000. Press measure, adjust to 100.0, read value.
Press measure, adjust current to 100.0 on ammeter, read resistance. "1" = over-range.
4. After test: turn current to minimum (CCW), reset measurement switch, then power off.
5. To retest: reset switch, reclamp test leads, press measure.
Fault Analysis
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Symptom
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Cause
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Remedy
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Note
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No Display on Startup
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1) Power not connected
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Connect Power
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Replace fuse with same model — no substitutions.
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2) 5A fuse not installed or open circuit
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Reinstall or replace fuse.
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Output Current Below 200A
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1) Test leads too long or cross-section too small
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Replace with larger gauge wire.
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No Current Output
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1) Device under test is open circuit
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Check Equipment
Troubleshoot
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2) Open circuit in test loop
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Check test loop and eliminate open circuit.
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Note: The above information and technical parameters are compiled and published by Yangzhou Darui Electric Co., Ltd.
