High Current Loop Resistance Tester, Micro Ohmmeter for HV Circuit Breaker Contact Resistance Test

High Current Loop Resistance Tester, Micro Ohmmeter for HV Circuit Breaker Contact Resistance Test

Product Description

High Current Micro Ohmmeter / HV Circuit Breaker Resistance Tester / Loop Contact Resistance Analyzer / High Precision Loop Resistance Tester
Features

Supports multi-range high test current: 50A,100A,150A,200A for selection.

Ultra-high minimum resolution up to 0.01μΩ, high measuring accuracy ±(reading ×0.5%+0.2μΩ).

7-inch color LCD screen, clear display and readable under strong sunlight.

High-speed chip automatic control, simple operation, fast measurement speed.

Complete protection functions: over-current, short-circuit and overheating protection.

Large-capacity non-volatile memory, stores up to 512 groups of test data, supports data view and export.

Built-in thermal printer to print test reports on site.

Comes with RS232 interface and Bluetooth for convenient data upload and remote control.

Wide working temperature range: -20℃ ~ 40℃, suitable for outdoor substation field test.

Portable rugged case design, compact size and light weight for easy transportation.

Product Parameters

FAQ

Question 1: Low reading stability / Fluctuating resistance measurement values
Customer: When conducting the contact resistance test on high voltage circuit breaker, the measured resistance value keeps fluctuating and cannot get a stable reading. What are the possible reasons?
Manufacturer: First check whether the surface of the test clips and circuit breaker contact has oxide layer, paint or dirt, polish the contact surface to ensure good metal contact. Check if the test cables and alligator clamps are firmly tightened without loose connections. Confirm that the test current reaches the set value and there is no intermittent disconnection on the current loop. Keep the test wire away from strong electromagnetic interference sources. Restart the instrument and redo the test. If the reading is still unstable, stop testing and contact technical support, do not disassemble the equipment casing privately.
Question 2: Instrument fails to output test current after starting measurement
Customer: I finish wiring correctly and start the test, but the tester cannot output the set high test current, the screen prompts no current output. How to solve this issue?
Manufacturer: Inspect the whole current loop for open circuit points, check the connection status of red and black heavy current cables and alligator clamps. Confirm the test object contact is not disconnected and the cable core is not broken. Check whether the power supply voltage of the instrument meets the rated requirement, poor power supply will cause current output failure. Check the internal protection fuse of the device. Restart the machine after reconnection. If the fault remains, cut off power immediately and contact technical team, never open the instrument shell for maintenance by yourself.
Question 3: Measured resistance value is much higher than the standard reference value
Customer: The measured contact resistance result is obviously higher than the factory standard value of the circuit breaker, the wiring is connected as required. What leads to this large deviation?
Manufacturer: The main factor is poor contact at the clamping position, metal oxide or rust on the clamping point will bring extra contact resistance. Confirm you use four-wire measurement mode correctly, do not mix voltage terminals and current terminals. Check whether the circuit breaker contact itself has poor closing state or mechanical defect. Clean the test contact surface and re-clamp the test clips at different positions for repeated testing. If the test result is still abnormal, check the tested high voltage equipment and contact technical support when necessary. Do not modify internal circuit of the tester.
Question 4: Touch screen no response during field testing
Customer: When using the tester in substation site, the touch screen stops responding and cannot set test parameters or trigger test. How to handle it?
Manufacturer: Check if the power cord is well connected and the input power is stable. Press the power button to power off the instrument completely, wait for 30 seconds then restart the device to reset the touch system. Check if there is water, dust or heavy vibration affecting the screen. Avoid operating under strong direct sunlight which may interfere touch recognition. If the touch function cannot recover after restart, stop operation and contact technical support, do not pry the screen panel.
Question 5: Printer cannot print test data after measurement finished
Customer: The resistance test completes successfully and data is stored on screen, but the built-in printer fails to print the test report. What causes this problem?
Manufacturer: Check if the thermal paper is installed in correct direction and confirm there is no paper jam inside printer compartment. Verify the printer power switch is turned on and no paper residue blocks the print head. Check if the test data has been saved completely before printing. Reinstall thermal paper and trigger print command again. If printing still fails, do not dismantle the printer module, turn off the instrument and contact technical support.
Question 6: Shipping Method
Customer: If we place an order, how do you typically ship the goods? Will there be any issues with transporting bulky items such as reactors?
Manufacturer: We default to using dedicated logistics lines or brand-specific express shipping services; small-sized main units and accessories may also be shipped via standard courier services. Large items, such as reactors and excitation transformers, are packed using wooden crates or wooden frames for reinforcement to prevent bumps and moisture exposure during transit; a packing list is included with each package to facilitate item-by-item counting for you. Logistics costs are typically determined by both parties in accordance with the contract terms; after shipment, we will send you both the tracking number and the carrier's contact phone number for easy tracking.If your project site is remote or if delivery to the site is required with a specified logistics company, please inform us in advance when placing your order; we can then coordinate and arrange accordingly.
Question 7: Delivery Lead Time
Customer: Our project is under tight deadlines; how long will it take for the order to be shipped after we place it? Can we request expedited shipping?
Manufacturer: Standard specifications – stock available; typically delivered upon receipt of the order. Orders can be shipped within [X] working days; for non-standard products requiring customized voltage levels, capacities, or reactor combination configurations, the production cycle typically ranges from [X] to [Y] days.The delivery time will be approximately 7-15 working days; the specific timeline shall be subject to the sales confirmation provided upon order placement. If your project has a tight schedule, please inform us of the latest expected delivery date before placing your order; we will first verify the production schedule and inventory status, and where possible, will coordinate expedited production and prioritize shipment. However, it is recommended to allocate sufficient transit time for logistics to avoid delaying on-site testing.
Question 8: After-sales Service and Warranty
Customer: What is the warranty period for this equipment? If any issues arise during on-site use, how will your after-sales service respond?
Manufacturer: We provide a two-year free warranty on the entire unit and lifelong technical support services. During the warranty period, if issues arise due to defects in the equipment itself, we will provide free repair or replacement of components; when problems occur on-site, we commit to responding within 24 hours; most wiring and parameter configuration issues can be resolved through remote guidance via video or telephone; for cases where an on-site visit is necessary, we will arrange for our technicians to arrive at the location to resolve the issue. After the warranty period expires, we still offer repair services, with spare parts supplied at cost price for the long term, and software updates provided free of charge for life. Upon delivery of the equipment, we also offer free operational training (video operation guides)to ensure that your testing personnel can operate the equipment independently and proficiently; should you have any further questions, please feel free to contact our dedicated after-sales hotline directly.
Question 9: Shipping methods for each region (Sea freight)
Customer: Our projects are distributed across several states, and our procurement volumes are substantial; are the shipping methods consistent across all states? How is the delivery time calculated?
Manufacturer: The specifications are identical; however, it should be specifically noted that this equipment set is large in size and heavy in weight—components such as the reactor and excitation transformer are all classified as heavy components. Therefore, regardless of which state or region the shipment is destined for, we will uniformly utilize sea freight transportation. The packaging employs export-grade wooden crates with reinforced structures, along with moisture-proof and rust-proof treatments; the design of these wooden crates is optimized for long-distance sea transport and multiple lifting and transshipment operations. Upon arrival at the destination, simply unpack the goods and conduct an inspection before putting them into use. Regarding delivery time, the sea freight transit period depends on the port of destination: near-sea routes are generally faster, whereas ocean routes may take longer; the exact number of days will be confirmed based on the shipping schedule specified in the bill of lading. We have a dedicated freight forwarding agency to handle booking of shipping space, customs declaration, insurance, and other related procedures; once the vessel departs, we will send you documents such as the bill of lading and the packing list, enabling you to arrange for the receipt of goods at the port of destination and their inland transshipment in advance.
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