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HF-WC-602 Handheld Contact Resistance Tester
This lightweight Handheld Contact Resistance Tester adopts the four-wire Kelvin testing method. It delivers accurate micro-ohm resistance readings for circuit breaker contacts, boasting portable design, simple operation and ideal for on-site power maintenance work.
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The HF-WC-602 Handheld Loop Resistance Tester is elaborately developed as a high-precision digital switch testing device in accordance with China’s latest power industry standard DL/T845.4-2019, leveraging our proprietary core technologies.
This tester is specially designed for accurate measurement of contact resistance (loop resistance) on high-voltage switches. It also applies to all scenarios requiring high-current & micro-resistance detection. Featuring reliable performance and precise test readings, it fully meets the loop resistance testing demands for field maintenance teams of power supply bureaus and high-voltage switch manufacturers.
For conventional loop resistance testing, one side of the earthing busbar on the tested switch shall be disconnected to eliminate measurement errors caused by current shunting through the grounding grid.
Features & Main Functions
- Equipped with a 7-inch high-brightness color LCD screen with clear display and user-friendly HMI; readable clearly even under direct sunlight.
- Controlled by high-speed main controller chip, delivering high automation level and ultra-simple operation procedures.
- Maximum output test current up to 100A, featuring rapid testing speed and superior measurement accuracy.
- Comprehensive multi-protection system: overcurrent protection, short-circuit protection and overheating protection.
- Overheat Protection: Safeguards rechargeable battery and power components; protection threshold: 70℃.
- Battery Over-Discharge Protection: The device locks all testing functions automatically once battery power is critically low to prevent deep discharge damage.
- Large-capacity non-volatile internal memory stores up to 512 groups of test data, supporting data review and export.
- Built-in high-precision real-time clock for continuous time display.
- Supports test data export via USB flash drive.
- Voice Broadcast Function: Automatically announces final measurement results right after each test completes.
- Integrated multi-mode communication ports: wired RS232, Bluetooth and Wi-Fi wireless communication, facilitating convenient data upload and remote device control.
Technical Specifications
| Parameter Item | Technical Data |
|---|---|
| Test Current Options | 50A / 100A |
| Measuring Range | 5μΩ ~ 25mΩ (50A mode) 5μΩ ~ 10mΩ (100A mode) |
| Minimum Resolution | 0.01 μΩ |
| Adjustable Test Duration | 50A gear: 5s / 10s / 30s / 60s / Quick Test 100A gear: 5s / 10s / 30s / Quick Test |
| Measurement Accuracy | ±(0.5% of reading + 0.2μΩ) |
| Operating Ambient Temperature | -10℃ ~ 50℃ |
| Relative Humidity | ≤ 90% RH, non-condensing |
| Power Supply | Built-in rechargeable lithium battery, charging voltage: DC 12.6V |
| Overall Dimensions | 235mm × 165mm × 75mm |
| Net Weight | 2.0 kg |
Simplified Operation Steps
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Preparation
Cut off power of tested switches, clean contact surfaces. Check device batteries and cables.
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Wiring
Connect four test clamps following Kelvin rule: voltage clips inside current clips.
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Settings
Power on, complete self-check, choose proper DC test current.
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Test
Tap Start to measure, record resistance value. Test repeatedly for precise results.
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Finish
Stop output current, power off, disconnect wires and store all accessories.
Notes: No live testing allowed. Avoid long continuous high-current tests to prevent overheating.
Packing List: Handheld Contact Resistance Tester
| Item | Quantity | Description |
|---|---|---|
| Main Tester Unit | 1 Set | Handheld contact resistance tester host |
| Current Test Cables with Clamps | 2 Pcs | High-current thick connecting wires & alligator clamps |
| Voltage Sampling Wires | 2 Pcs | Precision thin voltage measuring leads |
| Power Adapter / Charger | 1 Pc | For battery charging |
| User Manual | 1 Copy | English operation guide |
| Calibration Certificate | 1 Copy | Official factory calibration document |
| Portable Hard Carrying Case | 1 Pc | Shockproof storage box for whole set |
FAQ | Handheld Contact Resistance Tester
1. What is a handheld contact resistance tester used for?
This portable device accurately measures micro-ohm contact resistance of circuit breakers, switches and busbar joints. It is widely applied for on-site power equipment inspection and daily maintenance.
2. Why adopt the 4-wire Kelvin measurement technology?
The four-wire design removes extra resistance errors from test cables and clamps, delivering highly precise readings for tiny resistance values.
3. Why do test values keep fluctuating during measurement?
Unstable data is mainly caused by oxidized, dirty terminals or loosely fixed clamps. Clean contact points and tighten all clips firmly before retesting.
4. The device shows a poor connection warning, how to solve it?
Inspect damaged test leads, loose plugs or unfixed clamps. Reconnect all wires properly to eliminate the connection fault.
5. What is the correct placement for voltage and current clamps?
Voltage sampling clamps must be placed inside current clamps. This layout is essential to ensure accurate measurement results.
6. How to select the suitable test current?
100A DC is the standard option for high-voltage switches, while 50A is reserved for small low-voltage switching devices.
7. Is continuous long-duration high-current testing available?
No. Prolonged high-current output will overheat internal components. Allow sufficient cooling time between multiple tests.
8. What does OL displayed on the screen mean?
OL refers to over range. It appears due to open circuits, faulty wiring or severely worn switch contacts. Please check the whole circuit.
9. Can I carry out tests on live powered equipment?
Testing energized equipment is strictly prohibited. Cut off power completely and ground the tested gear beforehand for safety.
10. How to store the tester properly when not in use?
Store the whole set in the matched carrying case within a dry, dust-free space. Organize test cables neatly to avoid wire breakage.
11. Can this instrument test transformer winding resistance?
It is not recommended. This tester is professionally customized for switch contact resistance rather than inductive windings.
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