Correct use of DC resistance tester method

Performance characteristics

1, automatically select the output current (up to 20A output).

2, the measurement range is wide (0Ω-50Ω), can measure transformer, transformer and other inductive DC resistance.

3, the display uses 480 * 272 dot matrix 65K color large-screen display data clear and easy to read.

4, with perpetual calendar, 100 sets of data storage, automatic temperature conversion and other functions, shutdown does not lose data. This machine also has a printer that can output print test data. The "U disk" interface facilitates the export of data for review editing.

5, the device has RS485 communication interface, with the host computer control software to achieve long-distance control measurement.

6. Three identical measuring functions are provided to deal with the three-phase direct resistance measurement of the star connection winding once wiring, and the three-phase unbalanced rate is automatically calculated, which greatly saves measurement time and improves work efficiency. Phase-by-phase testing can also be used to perform phase-by-phase testing for transformers with YN and D(Y) connections. The test is completed and the three-phase imbalance rate is automatically calculated.

The instrument is also equipped with an automatic magnetic assist function. The test is performed on the low-voltage, corner-jointed transformer windings of cores. The high- and low-voltage string excitation method is used for testing. The internal magnetic loop of the windings is connected automatically to quickly and accurately test the low-voltage windings. DC Resistance.

7, the machine has a sound discharge alarm, clear discharge instructions, reduce misuse.

8, with the input misconnection AC380V power protection alarm protection function, to reduce the damage caused by misuse of the instrument, the machine also has a perfect back-EMF protection and strong arc resistance.

9, the machine has a wide temperature range, high precision, shock, anti-jamming, high stability, easy to carry and so on.

Instructions:

power supply

DC resistance fast tester provides two kinds of power for testing: AC220V/DC12V. In the case of strong electromagnetic field interference, it is recommended to use the DC power supply test. In this state, the tested value is stable and the power frequency interference resistance is strong.

A. DC power test:

Close the power switch, the power indicator light, press the "start and stop" button, you can select the appropriate resistance gear switch to test. After the test is completed, press the "start and stop" button, the "discharge" indicator light (if the test item storage capacity is small, then the "discharge" indicator does not light), after discharge, "discharge" indicator light extinguished, and then convert the test Clip, test again.

B. AC power test:

Connect the AC220V power supply, the corresponding indicator ("charge" indicator or "full" indicator) is on, close the power switch, and the power indicator is on. Press the start/stop key to select the corresponding resistance range switch for testing. After the test is completed, press the "start and stop" button. The "discharge" indicator light is on. After the discharge, the "discharge" indicator is extinguished, and then the test clip is converted and a test is performed again.

C, charge:

Connect the AC220V power supply. At this time, the "charge" indicator is on, indicating that the rechargeable battery inside the instrument is being charged. If the rechargeable battery inside the instrument is full, the “full” indicator lights up. The instrument is also charging the internal battery while using the AC power test. (The instrument has been designed with a charge protection circuit and will not be overcharged)

Test line connection method

Connect the instrument's I+, V+, V-, and I- terminals to the test object as shown in Figure 1. This connection method eliminates the effect of contact resistance and wire resistance on the measurement.

In use, if the length of the test cord that comes with the instrument is not enough, the test cord can be lengthened using a wire of comparable diameter.

measuring

After the test line is connected, close the power switch and the power indicator is on. Press the “Start/Stop” button and the meter will display “E0000”. Select the resistance range according to the size of the measured value, press the switch, then the indicator light, the four and a half LCD display the stable value is the measured resistance value, please pay attention to the selected range when reading The unit on (mΩ/Ω/kΩ). When measuring a large-inductance sample such as a power transformer, it is best to short-circuit the unmeasured coil outside the test loop to avoid electromagnetic interference.

Discharging

After testing, the total power can be turned off directly. If you are in a sensible test product, you should not disconnect the wire immediately after turning off the power. Allow the instrument to continue discharging. Generally discharge for at least 20 seconds, otherwise the back-EMF of the inductor will endanger personal safety.

Safety measures

1. Please read this manual carefully before using this instrument.

2. The operator of the instrument should have common knowledge of general electrical equipment or instruments.

3, the instrument can be used both inside and outside the home, but should avoid rain, corrosive gases, excessive dust, high temperature, direct sunlight and other places.

4, the instrument should avoid severe vibration.

5. The maintenance, care and adjustment of the instrument should be conducted by professionals.

6. After the test is completed, turn off the power first and then remove the test line.

7. When measuring a no-load regulator transformer, be sure to switch gears after the discharge indicator stops.

8. During the test, it is forbidden to move the test clamp and the power supply line.

Performance characteristics and technical indicators

1. Output current and range: Output current: 0-20A, range 0.5mW-2KW.

Note: Please use 0.2A gear test for 50W or more range.

2. Test accuracy: 0.2% The highest resolution: 0.1mW.

3. Using 7-inch large-screen true color LCD display, Chinese menu, wiring graphic tips, intuitive and convenient operation.

4. The transformer for the YN-connected winding can be measured simultaneously (three identical measurements); the resistance of the transformer N-phase connection wire (neutral resistance) of the YN-connected winding can be measured.

5. It can convert the winding material and measure the temperature; it will automatically display the unbalance ratio of the three-phase winding.

6. Manually adjust the tap position in the test interface.

7. With large capacity storage, can store 200 test records,

8. Working power supply: AC220V±10; working temperature: 10°C～40°C; working humidity: ambient humidity<80%RH

9, the instrument weight: 4.