Product Details
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High Precision Loop Resistance Tester with Thermal Printer and U-disk Data Storage

High Precision Loop Resistance Tester with Thermal Printer and U-disk Data Storage

Product Description

1. Contact(Loop) resistance increases due to contact surface oxidation, poor contact fastening and other reasons.
2. The Test procedures require conductive contact resistance testing of various switchgear and cable connectors,the test current shall not be less than 100A.
3. When the high current flows, the temperature of the contact point rises, which accelerates the oxidation of the contact surface and further increases the contact resistance will lead to serious accidents.
4. Therefore, it is necessary to measure the contact resistance often or regularly.

Product Alias

Loop Resistance Tester / Contact Resistance Tester / Circuit Breaker Contact Resistance Tester / High Voltage Switch Loop Resistance Tester / Micro Ohmmeter / Micro Ohm Meter / High Current Contact Resistance Tester / Loop Resistance Measuring Instrument

Feature

1.Wide resistance measurement range and high resolution.
2.High precision switching power supply, automatically adjust.
3.With temperature compensation function, automatically convert to 20ºC resistance.
4.Easy operation with a 5.0" 65K color touch screen.
5.Built-in high-capacity non-volatile memory for 500 sets of data.
6.Built-in high-speed micro thermal printer for printing measurement data.
7.Data can be exported through a U disk.

Product Parameters

Test current	Test range	Accuracy
200A	0~10mΩ	±(0.5%rdg+0.2μΩ)
150A	0~20mΩ
100A	0~40mΩ
50A	0~80mΩ

Parameter	Specification
Open-circuit voltage	DC 10V
Ambient temperature	-10°C to 50°C
Ambient humidity	≤85% RH, non-condensing
Operating power supply	AC 220V ±10%
Resolution	0.0001 μΩ, 5 significant digits
Tester size	380mm × 280mm × 330mm
Tester weight	10 kg

Application Scenarios

FAQ

Question 1: What equipment and occasions is this loop resistance tester suitable for?
Customer:What equipment can this tester measure? Can it be used for circuit breakers, disconnectors and busbar connections in substations?
Manufacturer:Yes. This loop resistance tester is specially designed for measuring the contact resistance (DC resistance) of high-voltage switchgear, including circuit breakers, disconnectors (isolating switches), busbar connection points, current transformers and cable joints. It is widely used in substation preventive tests, commissioning tests after installation, and post-maintenance checks. The tester outputs a large test current (100A/200A) to measure the micro-ohm level contact resistance, which can effectively reflect the contact condition of switch contacts, helping to detect poor contact, contact burning or loose connections in time.
Question 2: What are the measurement accuracy and key technical specifications?
Customer:What is the measurement accuracy of this tester? What are the ranges of test current and resolution? How about the working environment requirements?
Manufacturer:This tester adopts high-precision measurement design with a resolution of 0.0001 μΩ (5 significant digits), ensuring high accuracy and repeatability for micro-ohm measurement. The open-circuit voltage is DC 10V, and the test current can be selected according to the rated current of the tested equipment. The working environment requirements are: ambient temperature -10°C to 50°C, relative humidity ≤85% RH non-condensing, operating power supply AC 220V ±10%. The instrument is compact with the size of 380mm×280mm×330mm and weight of 10kg, easy to carry for field work.
Question 3: How to save, print and export the test data?
Customer:After the test is completed, how can I save the measurement results? Can the tester print a report on site and export data to a computer?
Manufacturer:Yes. The tester is equipped with a built-in thermal printer, which can print the test report directly on site after each measurement. At the same time, the instrument has internal data storage function, and supports U-disk data export: insert a U-disk into the USB interface and export the stored data for archive management. The exported data can be further analyzed with the supporting PC software, which is convenient for generating complete test reports and long-term trend tracking of equipment contact resistance.
Question 4: What should be noticed for on-site wiring, grounding and operation safety?
Customer:What safety points should I pay attention to when testing in the substation? Do I need to disconnect the equipment before testing?
Manufacturer:Safety first. Please strictly follow the following points: First, all tests must be carried out after the tested equipment is completely powered off and reliably grounded; it is strictly forbidden to test with live equipment. Second, before testing, confirm that the switch contacts and test clamps are firmly connected, and polish the contact surface if there is oxidation, otherwise the measurement result will be affected. Third, during the test, do not touch the test clamps and cables to avoid electric injury or affecting the measurement. Fourth, keep the instrument away from strong electromagnetic interference sources, and avoid operating in rain or high humidity environment. After the test, disconnect the test leads in time and restore the equipment according to the operating procedures.
Question 5: What about the warranty and after-sales technical service?
Customer:What is the warranty period of this tester? What if there is a fault during use? Do you provide technical support?
Manufacturer:We provide a 2-year warranty for the whole machine. During the warranty period, if the instrument fails due to non-human quality problems, we provide free repair service. In addition, we provide lifetime technical support: our engineers can guide you through the operation and troubleshooting by phone, email or remote video. If the instrument needs to be repaired, please contact our after-sales team first, do not disassemble the instrument by yourself, so as not to affect the warranty. We also provide operation manual, video tutorials and standard wiring diagrams for the first-time users.
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

Shipping scenario

Scene (One)

Scene (Two)

Attachment Directory

No.	Part Name	Description	Qty
1	Crocodile Clip Test Lead (Black)	Black wire with black-silver crocodile clip for test circuit connection	1 set
2	Crocodile Clip Test Lead (Red)	Red wire with red-silver crocodile clip for test circuit connection	1 set
3	Test Leads with Terminals (Red & Black)	Red and black wires with terminals for terminal connection	2 pcs
4	AC Power Cord (3-Pin)	Black 3-pin power cable for instrument power supply	1 pc
5	Grounding Test Lead	Braided copper wire with crocodile clip for earthing connection	1 pc
6	Metal Contact Terminal	Gold cylindrical metal fitting	1 pc
7	Spare Fuse	Fuse for instrument over-current protection replacement	2 pcs

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