Product Details
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400A Loop Resistance Tester Battery Operated with Touch Screen & Thermal Printer

400A Loop Resistance Tester Battery Operated with Touch Screen & Thermal Printer

Product Description

The reliable and effective connection between the grounding downconductor of the power equipment and the grounding network is the fundamental guarantee for the safe operation of the equipment. The grounding down-conductor is the connection part between the power equipment and the ground network. During the long-term operation of the power equipment, the connection may be affected by factors such as moisture, and the nodes may be corroded or even broken. The resistance of the connection point of the grounding grid increases, so that it cannot meet the requirements of the electric power regulations, so that the equipment has unsafe hidden dangers in operation, and in severe cases, the equipment will lose ground.

Product Alias

400A Loop Resistance Tester / 400A Contact Resistance Tester / Battery Powered Loop Resistance Tester / Portable Loop Resistance Tester / High Current Micro Ohmmeter

Features

1. The new power supply technology is adopted in the grounding down lead conduction tester.
2. It has the characteristics of small size, light weight, large output current, good repeatability, strong anti-interference ability and protection function.
3. The whole machine is controlled by single chip microcomputer, which has a high degree of automation.
4. The instrument has high precision and easy operation. The maximum current is 10A

Product Parameters

Product Name	Ground Down Lead Continuity Tester
Model Number	MY-5204
Measuring Range	0.3A~10A
Accuracy Class	0.02
Operating Temperature	-10ºC~50ºC	Maximum Test Current	10A
0.3A	100mΩ~50Ω	1A	30mΩ~15Ω
3A	10mΩ~5.0Ω	5A	5mΩ~2.0Ω
10A	1mΩ~0.6Ω	Resolution	0.0001μΩ

Application Scenarios

FAQ

Question 1: What kind of field test services can you provide for power equipment?
Manufacturer: We provide full-set on-site testing, commissioning and diagnostic services for high-voltage power equipment, covering power transformers, high-voltage circuit breakers, current transformers, voltage transformers, high voltage cables, arresters and GIS switchgear. Our available test items include transformer turns ratio, winding DC resistance, insulation resistance, dielectric loss & capacitance, power frequency / AC/DC withstand voltage, SFRA sweep frequency response analysis, OLTC on-load tap changer test, circuit breaker dynamic characteristic test, contact resistance test and partial discharge inspection. These field test services are widely applied in substation hand-over acceptance after new project construction, regular preventive maintenance of in-service power equipment, and fault location & diagnosis when equipment has abnormal alarm or hidden defects. Our professional technical team can go to the substation site to complete all tests on site.
Question 2: What pre-work should be prepared before on-site HV test?
Manufacturer: First of all, the tested power equipment must be completely de-energized, fully discharged for enough time and reliably connected to the ground wire, which is the most critical safety requirement. The customer needs to clean the test area, reserve enough safe working space, remove dust, oil stain and oxide on equipment terminals, and isolate the test zone with warning barriers and safety signs to prevent unrelated personnel from entering. Meanwhile, please prepare and provide equipment nameplate parameters, historical test reports, previous maintenance records, and on-site environment data including ambient temperature, relative humidity, and surrounding strong electromagnetic interference condition. Our engineers will rely on these materials to formulate a targeted, safe and standardized field test plan before we arrive at the site.
Question 3: Can your instruments work normally in strong electromagnetic interference substation environment?
Manufacturer: Yes. All our high voltage test instruments adopt mature EMC electromagnetic compatibility and anti-interference design. Many testers use variable frequency and frequency offset technology to separate the test signal from 50Hz power frequency interference generated by surrounding live equipment, effectively filtering interference noise. Even in substations with heavy electromagnetic disturbance, the instrument can keep stable sampling and accurate measurement. However, we still recommend operators keep sufficient safety distance from live high voltage equipment during testing, use shielded and low-noise test cables, properly ground the instrument host, and avoid long parallel layout of test wires and power cables. These operations can further reduce signal disturbance and guarantee repeatable and reliable test data.
Question 4: Will the high voltage field test damage the power equipment under normal operation?
Manufacturer: When the whole test is strictly implemented following IEC, IEEE and domestic power industry standards together with our official operation manual, the field high voltage withstand test belongs to non-destructive inspection. Its core purpose is to evaluate the insulation health status of power equipment, and qualified equipment can pass the test without any damage. If the tested equipment already has hidden insulation defects such as insulation aging, tiny crack or internal damp, the test can detect these potential risks. Our engineers will select the proper test voltage value and holding time strictly according to the equipment rated voltage, service age and operation condition. We will never carry out over-voltage test to protect the power equipment.
Question 5: Can you supply test reports after field test service?
Manufacturer: Definitely yes. Once all on-site measurement and data recording are finished, our technical engineers will organize and check all raw test data, waveform curves, screenshots and field records one by one. We will make a formal and complete test report, including basic equipment information, test environment parameters, test items, original measured data, historical data comparison, result analysis and professional evaluation & maintenance suggestions. The final report can be exported as PDF electronic file, and we also support on-site printing of paper copies. The report can be directly used for project handover acceptance, power department file archiving, and long-term tracking of equipment performance trend in future maintenance cycles.
Question 6: 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: 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: 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: 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

Serial Number	Name	Amount
1	Mainframe	one
2	Test line (high current line 6m2, two high current test clps, Voltage test line 6m2)	one
3	Ground lead	one
4	8A Fuse	three
5	Accessory package	one
6	AC 220V Power line	one
7	Printing paper	four
8	Disk	one
9	Specification	one
10	Inspection Report	one
11	Certification	one

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