This winding resistance tester adopts a new power supply technology, which has the characteristics of small size, light weight, high output current, good repeatability, strong anti-interference ability, and complete protection functions. The entire machine is controlled by a high-speed microcontroller, with a high degree of automation and automatic discharge and discharge alarm functions. The instrument has high testing accuracy, simple operation, and can achieve rapid measurement of transformer direct resistance.
Product Introduction
1. The winding resistance tester has 6 levels of output current (maximum: 20A; minimum: <10mA), which is suitable for DC resistance measurement of a variety of transformers and mutual inductors.
2. The measurement range of the tester is 0.001Ω to 20KΩ.
3. The tester has a higher response speed. The on-load tap switch can be directly enabled during measurement, and the tester will automatically refresh data.
4. The tester has the function of sound discharge alarm and clear discharge indication, to reduce misoperation.
5. The tester has complete protection functions for reliable protection against the impact of back EMF, thus achieving more reliable performance.
6. The tester is equipped with a 7-inch color LCD screen, which can display data in a clear and attractive manner. In addition, output results can be printed in a real-time manner.
7. The protection function is perfect, which can reliably protect the impact of back electromotive force on the instrument, and the performance is more reliable.
8. The response speed is fast, the instrument measurement data is stable, and the instrument automatically refreshes the data during the test.
9. Intelligent power management technology, the instrument always works in the minimum power state, effectively reducing the internal heating of the instrument and saving energy.
10. The instrument has a non-power-off clock inside.
11. The instrument has a non-power-off memory inside, which can permanently save data.
Product Parameter
|
Model |
JH2820 |
|
Working power supply |
220V (AC) |
|
Output current |
20A, 10A, 5A, 2A, 100mA, <5mA (6 levels for testing) |
|
Measuring range |
20A, 10A, 5A, 2A, 100mA, <5mA (6 levels for testing) |
|
Minimum resolution |
1u Ω |
|
Weight |
8kg |
|
Accuracy |
±(0.2% RD+0.05% FS) |
Notes
1. When connecting the test clamp to the grounding wire, it is important to note that the contact end is exposed to the air for a long time and covered with an oxide film on the surface, which may cause unstable or inaccurate measurement results. Therefore, when wiring, it is necessary to clean the oxide film or twist the test clamp vigorously a few times after connecting it to the lead out terminal to cut through the oxide film and ensure a good connection.
2. Before disconnecting, be sure to wait for the instrument to reset and there to be no current output. After the discharge is complete, turn off the power before disconnecting.
3. When selecting the current, refer to the range in the technical specifications column and do not use it beyond or below the range.
Product Accessories
- A portable hard case
- A black carrying bag
- A set of dedicated test leads (red, black, and multi-color)
- Three spare fuses
- A USB cable
- Two rolls of printing paper
- A set of red and black adapter cables with alligator clips
- A set of black test leads with large alligator clips
Prodect Qualification
Deliver, Shipping and Serving
FAQ
Q: What core functional features does the instrument have to ensure the reliability of test results and equipment safety?
A: It has a complete protection function to resist the impact of back electromotive force reliably; 2. It adopts intelligent power management technology to reduce internal heating and ensure stable data; 3. It is equipped with automatic discharge and discharge alarm functions to avoid equipment damage caused by residual voltage.
Q: What precautions should be taken when selecting the test current to avoid affecting the measurement results?
A: When selecting the test current, refer to the range corresponding to each gear in the technical indicators, and prohibit over-range or under-range use. Over-range will lead to unstable test results, while under-range will cause unstable data for large-capacity transformers due to insufficient current.
Q: What are the requirements for the use environment of the instrument, and what should be noted for outdoor use?
A: The instrument can be used indoors and outdoors, with a working temperature of 0~40℃ and working humidity <90%RH (no condensation). When used outdoors, it must be kept away from rain, corrosive gas and severe vibration to avoid damage to the internal circuit and inaccurate test data.
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