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Operation

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1. Wiring: Connect the instrument terminals (A, B, C, a, b, c) to the transformer terminals (A, B, C, a, b, c) accordingly. Be careful not to reverse the high and low voltage connections, as this may damage the instrument.

2. Turn on the power switch. The display will show self-test 1; self-test 2; self-test 3; passed, indicating the instrument is performing self-test. Finally, it will display the turns ratio, tap percentage, vector group, and the information display (error display) will show "Self-test passed", indicating the instrument is normal and ready for the next step.

3. Press the key to sequentially input the turns ratio, tap step, and vector group until the parameter indicator light turns off. If the parameters for this test are the same as the previous one, this step can be omitted.

4. Use the tap adjustment key to adjust the tap position. Each press of this key moves the tap value by one tap step. If pressing the tap adjustment key has no effect on the tap display, it means the tap step has not been set. In this case, press the parameter key to set the tap step.

5. Measurement

a. Three-phase continuous: Press the key, the key light turns on. Press the key, the key light turns on, and the instrument begins measurement and automatically enters recording mode. After each phase is measured, a beep sounds, and it proceeds to the next phase. After all phases are completed, it stops automatically.

b. Single-phase: Press the key, the key light turns on. Press the key, the key light turns on, and the instrument begins measurement. After the error display stabilizes, record the data, then press the key, the key light turns on, completing the AB phase test. Similarly, complete the BC and CA phase measurements.

6. Printing

a. If printing is required, you must press the record key before measurement. The key light turns on, and the instrument enters automatic recording mode, automatically recording data for each subsequent measurement operation. If the power is cut off, or if you use the three-phase continuous function for measurement, the instrument records automatically, and there is no need to press the key before measurement.

b. Press the print key, the screen displays "Printing", and after a moment, the screen displays "Print completed". If you press any key during printing, the screen displays "Print aborted", allowing you to exit printing midway. If there is no data in memory, pressing the print key will cause both the print and record key lights to flash, and the screen will display "Memory empty", indicating printing is not possible.

C. Of course, if previous test data does not need to be retained, clear the data before measurement. Press the key. If the memory is already empty, the clear memory and record key lights will flash simultaneously, and the screen will display "Memory already empty". If the memory is not empty, the screen will display "Clear memory?", then press the clear memory key again to clear the memory. If you want to abort clearing, press any other key, and the screen will display "Clear memory aborted". When the memory is full, the and key lights will flash as a reminder. Press the key twice consecutively to clear old data.

7. Use of Other Function Keys

a. key: If you need to observe the measured turns ratio during measurement, press the key before measurement. The key light turns on, indicating that the measured turns ratio can be displayed during measurement. Press the key again, the key light turns off, and the measured turns ratio will not be displayed during measurement.

b. key: Most transformers have taps on the high voltage side. When testing transformers with taps on the low voltage side, use this key. The key light turns on; press again to turn it off. In most cases, this key light should be off.

c. key: If the vector group of a three-phase transformer is unknown, connect the three-phase transformer test leads, press the key, the key light turns on. Press the key, and the instrument begins working. It takes about 70 seconds, after which the vector group and turns ratio test results will be displayed. The instrument does not analyze single-phase transformer vector groups; it is only 0 or 6. If the polarity is incorrect, the vector group display window will flash to indicate an error. Some transformers may show errors during vector group analysis, but can measure normally with input parameters. The reason is that the transformer core lamination symmetry is poor, and when one limb is excited, the magnetic distribution in other limbs has large errors.

d. key: Press the key, and the instrument begins self-test. First, it sequentially lights up all displays for the operator to check, then checks whether the voltage divider and measurement circuit are working properly.

e. Numeric keys: The numeric keys are multi-function keys, effective when the key light is on. For example, when the parameter key light is on, pressing the key inputs the digit "0". When the parameter light is off, pressing the key prints.

Usage Precautions

1. During measurement, do not touch the test object.

2. If the test leads are short-circuited or the high and low voltage connections are reversed, the fuse will blow. After the fuse blows, if you attempt a measurement, the display will show "Measuring, please wait!" and then stop. Turn off the power, replace the fuse with one of the same capacity, and retest.

3. Ensure good contact in connections, and the instrument should be properly grounded!

4. The working environment of the instrument should be away from strong electric fields, strong magnetic fields, and high-frequency equipment. The power supply interference should be as low as possible; it is advisable to use lighting circuits. If power interference is still significant, an AC purified power supply with a capacity greater than 200VA can be used to power the instrument.

5. During operation, if the LCD display is disordered, all keys are unresponsive, or the measured values differ greatly from actual values, press the reset key or turn off the power and restart the operation.

6. If the display has no characters or the color is too light, adjust the brightness potentiometer to a suitable position.

7. The instrument should be stored in a dry and ventilated place.

Test Purpose

1. Check whether the turns ratio matches the nameplate value to ensure the required voltage transformation is achieved.

2. Check whether the tap changer indicator position is correct.

3. Check the turns ratio of each winding to determine if there are inter-turn short circuits in the transformer.

4. Measure the unbalance of the transformation ratio of a three-phase transformer itself.

5. Provide the accuracy of the transformation ratio to determine whether transformers can operate in parallel.

6. Testing of transformer turns ratio.

Practical Tips

1. For single-phase turns ratio or coil turns ratio measurement

◆ Connect the high-voltage terminals (A, X) of the coil to terminals A and B of the bridge, and the low-voltage terminals (a, x) to terminals a and b. Set the vector group to 0 (or 6), and use the AB phase for measurement. Other phases can also be used.

2. Unknown turns ratio situation

◆ When the turns ratio error is too large, the turns ratio will flash to indicate an error, and then display the measured turns ratio value. If the exact turns ratio is unknown, you can input any turns ratio, and after measurement, the instrument will display the measured turns ratio value.

Installation Method

(1) A-type panel: Hold the elastic clips on both sides of the printer frame, push the entire printer into the mounting hole of the instrument or equipment panel, and check that the printer is securely installed.

(2) D-type and F-type front paper-load panel: Installation is extremely simple and convenient. Insert the entire printer into the mounting hole of the instrument or equipment panel, then clamp the printer from behind the equipment panel with the plastic clips and tighten the screws.

The general paper loading process is as follows:

① Remove the front cover of the printer

② A-type panel micro printer must be removed from the instrument panel. Note that the micro printer power must be turned off before operation. D-type, F-type front paper-load panel, and T-type desktop can skip this step.

③ Remove the paper roll shaft, install a new paper roll, place the paper shaft back into the guide slot of the printer, and ensure the paper roll shaft is securely installed and will not fall out.

④ Cut the paper end into a triangle or trim it neatly.

⑤ Turn on the printer power. After the printer advances a few lines of paper, press the SEL key to turn off the SEL indicator, then press the LF key to rotate the print head. Manually feed the paper head into the paper inlet below the print head. The paper will slowly feed into the print head until it emerges from the front of the print head. Then press the LF or SEL key to stop the print head rotation → close the printer cover, and thread the paper out through the paper slot in the front cover.

Replacing the Ribbon Cartridge

Replacing the ribbon is only for dot matrix printers. Thermal printers only require special thermal paper and do not need ribbon replacement (consumables). Note: Thermal paper has two sides, and only the front side can be printed on.

The process for replacing the ribbon cartridge is as follows:

① Open the printer front cover.

② Lift the right end of the ribbon cartridge first, then lift the left end (the end with the knob) to remove the ribbon cartridge.

③ Gently place the left end of the new ribbon cartridge onto the gear shaft of the print head, turn the knob on the ribbon cartridge in the direction of the arrow until the right end of the ribbon cartridge falls into place, then lower the right end of the ribbon cartridge.

④ Install the printer cover. First, hang the upper part of the front cover onto the frame, paying attention to aligning the indicator lights and buttons, then press the lower part of the front cover toward the frame with slight force to snap it into place.

Safety Measures

1. Read this manual carefully before using the instrument.

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

3. This instrument can be used indoors and outdoors, but should avoid rain, corrosive gases, excessive dust, high temperature, direct sunlight, and other places.

4. The instrument should avoid severe vibration.

5. Maintenance, care, and adjustment of the instrument should be performed by professionals.

6. The yellow, green, and red test clips correspond to the transformer's A, B, C phases; do not connect them incorrectly.

7. Do not reverse the high and low voltage cables.

8. When testing single-phase transformers, only use the yellow and green clips; do not use the wrong ones. Unused test clips should be left hanging.