MY-5201S Portable Loop Resistance Tester, High Precision Handheld Micro Ohm Meter for Substation Test

MY-5201S Portable Loop Resistance Tester, High Precision Handheld Micro Ohm Meter for Substation Test

Product Description

This rugged handheld contact resistance tester is powered by built-in rechargeable lithium battery. It delivers precise micro-ohm resistance measurement for high voltage circuit breakers, isolating switches, earthing switches and busbar joints. Widely applied in power plants, transformer factories and substations for factory inspection, handover acceptance and preventive maintenance.

Product Alias

Handheld Micro Ohmmeter / Portable Loop Resistance Tester / High Current Contact Resistance Meter / Circuit Breaker Contact Resistance Tester / Micro-ohm Resistance Analyzer / Portable Contact Resistance Test Instrument

Feature

1.High Precision: Measures contact resistance with ±0.5% accuracy.
2.Wide Current Range: Supports up to 200A for versatile circuit testing.
3.Compact Design: Portable size fits easily in your pocket.
4.User-Friendly Interface: Intuitive screen with multiple measurement options.
5.Robust Build: Rugged design withstands harsh environments.

Product Parameters

Application Scenarios

FAQ

Question 1: The measured resistance value is unstable and fluctuates greatly during testing
Customer: When I use this handheld contact resistance tester on site, the resistance reading keeps jumping and cannot get stable data. What are the possible reasons?
Manufacturer: This issue is mostly caused by poor contact or electromagnetic interference. First, clean the contact surface of the tested equipment to remove oxide, paint, dust and grease. Check whether the test clamps and alligator clips are firmly clamped without looseness. Confirm that test wires are not damaged. Keep the instrument and test cables away from high-voltage live lines and power cables to reduce electromagnetic interference. Avoid shaking the test leads during measurement. Restart the instrument and perform measurement again after all above checks.
Question 2: Instrument fails to start after long time storage
Customer: The handheld tester cannot power on after being stored for several months. How to troubleshoot?
Manufacturer: It is usually caused by low built-in lithium battery. Connect the 12.6V matching charger to charge the host continuously for 4 hours. Do not use non-original chargers with mismatched voltage. If charging for 4 hours still cannot boot, check whether the charging port is loose or oxidized. If the battery is aging and cannot hold charge, please contact us for battery replacement. Do not disassemble the host by yourself.
Question 3: What test objects can this contact resistance tester measure?
Customer: What power equipment can this instrument test on substation site?
Manufacturer: This handheld contact resistance tester is designed for micro-ohm level resistance measurement. It is widely used for high voltage circuit breakers, isolating switches, earthing switches, busbar joints and cable connectors. It is applied for factory delivery inspection, handover acceptance and preventive maintenance test in power plants, transformer factories and substations.
Question 4: "Test Failed" prompt appears after starting measurement
Customer: After wiring and starting the test, the screen pops up "Test Failed". How to solve it?
Manufacturer: First check the wiring sequence, confirm positive and negative test leads are correctly connected to the two ends of the measured contact. Check open circuit of test cable or loose terminal connection. Confirm the measured object is disconnected from power supply and fully discharged before test. If the measured resistance exceeds the maximum measuring range, the test will also fail. Recheck wiring and test loop, then retry.
Question 5: How to store and maintain the instrument when not in use?
Customer: What maintenance requirements for long-term storage of this handheld tester?
Manufacturer: Store the instrument in dry, dust-free room with temperature from -10℃ to +50℃. Fully charge the battery every 3 months during long storage to protect lithium battery life. Wipe the instrument shell and test clamps with dry soft cloth, do not use corrosive liquid. Avoid heavy drop and strong impact to the touch screen and host. Put all accessories into cable bag after use. Regularly use the standard resistor to verify measurement accuracy before field test.
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

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Scene (Two)

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