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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) correspondingly. 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 input the turns ratio, tap spacing, and vector group in sequence until the parameter indicator light goes out. If the parameters used for this test are the same as the previous ones, 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 spacing. If pressing the tap adjustment key has no effect on the tap display, it means the tap spacing has not been set. In this case, press the parameter key to set the tap spacing.

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 the recording state. After each phase is measured, a prompt tone 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. 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, press the record key before the measurement operation. The key light turns on, and the instrument enters the automatic recording state, automatically recording data from each subsequent measurement operation. If the power is cut off, and if the three-phase continuous function is used 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 any key is pressed 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 key light and the record key light 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 the measurement operation. Press the key. If the memory is already empty, both the clear memory key light and the record key light will flash, 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, or press any other key to abort clearing, and the screen will display "Memory clear aborted". When the memory is full, the and key lights will flash as a prompt. 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 measuring transformers with taps on the low voltage side, use this key. The key light turns on. Press this key again, the key light turns 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, the instrument begins working, taking about 70 seconds. The vector group and turns ratio test results will be displayed. The instrument does not analyze the vector group of single-phase transformers; 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 normal measurement can be performed with input parameters. The reason is that the symmetry of the transformer core lamination is poor, and when one limb is excited, the magnetic distribution in other limbs has larger errors.

d. key: Press the key, the instrument starts self-test. First, it lights up all displays in sequence for the operator to check, then it 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 with the number "0" inputs 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 measurement is attempted, 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 place of the instrument should be far from strong electric fields, strong magnetic fields, and high-frequency equipment. The power supply interference should be as small as possible. It is advisable to use lighting lines. 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 is an inter-turn short circuit in the transformer.

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

5. Provide the accuracy of the turns 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 flashes to indicate an error, then displays the measured turns ratio. If the exact turns ratio is unknown, you can input any turns ratio, and after measurement, the instrument will display the measured turns ratio.

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-loading 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 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-loading 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 groove 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, 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, and the paper will gradually enter 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 of replacing the ribbon cartridge is as follows:

① Open the printer front cover.

② First lift the right end of the ribbon cartridge, then lift the left end (the end with the knob), and the ribbon cartridge can be removed.

③ Gently place the left end of the new ribbon cartridge on the gear shaft of the print head, turn the knob on the ribbon cartridge in the direction of the arrow until the 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 on the frame, paying attention to aligning the indicator lights and buttons, then press the lower part of the front cover towards the frame with slight force to snap it into place.

Safety Measures

1. Read this manual carefully before using this 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 A, B, C of the transformer, respectively. Do not connect them incorrectly.

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

8. When measuring a single-phase transformer, only use the yellow and green clips. Do not use the wrong ones. Unused test clips should be left hanging.