Products video
HM5002 50A Transformer DC Resistance Tester Operation and Connection Video
Products overview
The HM5002-50A instrument employs cutting-edge power supply technology, featuring a compact size, lightweight design, wide measurement range, robust interference resistance, comprehensive protection functions, and a large-screen colour LCD display. Controlled by a microcontroller, the unit automatically performs self-checks and data processing, incorporating automatic discharge and discharge indication capabilities. Offering high measurement accuracy and straightforward operation, it enables rapid direct resistance measurement.
Products features
1. The tester has 7 levels of output current (maximum: 50A; minimum: <5mA), which is suitable for DC resistance measurement of a variety of transformers and mutual inductors.
2. The measurement range of the tester is 40μΩ to 100KΩ.
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 operation interface (Chinese and English) of the tester can be configured as required by customers.
8. The tester has a RS485 communication interface to transmit test data to the background.
9. The tester has a large storage capacity for 500 test records at most.
10. The tester has USB interface for transfer of test data into USB flash disks.
11. More complete parameters can be set, including the test winding, tap position, test phase, test sample temperature, conversion temperature and others of the transformer.
12. The tester has an industrial plastic case, which is easy to carry and helpful to prolong the service life.
Products Parameter
1. Output current: 50A,20A, 10A, 5A, 2A, 100mA, <5mA (7 levels for testing).
2. Range:
40μΩ to 400mΩ (50A)
100μΩ to 1Ω (20A)
500μΩ to 2Ω (10A)
1mΩ to 4Ω (5A)
2mΩ to 10Ω (2A)
100mΩ to 200Ω (100mA)
200Ω to 100kΩ (<5mA)
3. Accuracy: ±(0.2%+2word)
4. Resolution: 0.1μΩ
5. Working temperature: -10~40℃
6. Ambient humidity: ≤90% RH, no condensation
7. Altitude: ≤1000meters
8.Working power supply: AC220V ± 10%, 50HZ ± 1HZ
9. Dimensions: 428mm * 350mm * 230mm
10. Weight: 10.9kg
Panel Description
Instrument panel, as shown below:
Figure 1
1. U+, U-: Voltage input terminals, red being positive, black being negative;
2. I+, I-: Current output/input terminals, red being positive, black being negative;
3. LCD: 7-inch colour liquid crystal display, showing menus, current and resistance values, etc.;
4. Printer: Micro printer, printing test results in real time;
5. RS485: Communication interface between the instrument and host computer;
6. USB port: Interface for connecting the instrument to a USB flash drive;
7. Three-in-one power socket: Instrument power control switch. When connected to a three-core power cable, slide the switch button on the left side of the power socket to the ON position (' ▏ ') to power on the instrument;
8. Grounding terminal: For grounding the entire instrument housing, serving as a protective earth;
9. Confirm key: When the cursor is positioned over any menu on the main interface, pressing this key enters the corresponding submenu. For example, with the cursor on the DC resistance test menu, pressing this key enters the DC resistance test current selection interface;
10. Right scroll key: Moves the cursor right through main menus and their associated function options;
11. Left scroll key: Moves the cursor left through main menus and their associated function options;
12. Up Scroll Key: Scrolls the cursor upwards through main menus and functional options.
13. : Down arrow key: Scrolls down through main menus and functional options;
14. Print key: Press to print measurement results after testing;
15. Save key: Press to save current test records after testing;
16. Back key: Press to return to the previous menu level after measurement completion or parameter configuration.
wiring Description
Test wiring:
Connect the test specimen to the terminal blocks of this unit via the dedicated test lead, ensuring a secure connection, and simultaneously connect the earth lead.
A: Single-phase measurement method, see diagram below.
Figure 2
B. See Figures 3 to 5for the auxiliary magnetic connection method (applicable to the Y(N)-d-11 connection group).
Figure 3
Figure 4
Figure 5
When measuring the low-voltage side of large-capacity transformers, if the maximum current of the DC resistance tester is relatively low under existing conditions, or to expedite the measurement process, the auxiliary magnetisation method may be employed. In the diagram above, Figures 3, 4, and 5 illustrate the wiring configurations for measuring low-voltage Rac, Rba, and Rcb respectively.
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