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, otherwise the instrument may be damaged.

2. Turn on the power switch. Then the display shows self-test 1; self-test 2; self-test 3; passed, indicating that the instrument is performing self-test. Finally, it displays the transformation ratio, tap percentage, group, and the information display bar (error display bar) shows "Self-test passed", indicating that the instrument is normal and the next step can be performed.

3. Press the key to input the transformation ratio, tap spacing, and group in sequence until the parameter indicator light goes out. If the parameters used in this test are the same as the previous ones, this operation can be omitted.

4. Use the tap adjustment key to adjust the tap position. Each time this key is pressed, the tap value moves by one tap spacing. If pressing the tap adjustment key has no response in the tap display bar, it indicates that the tap spacing has not been set. At this time, 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, the instrument starts measuring and automatically enters the recording state. After each phase is measured, a prompt tone sounds, and it proceeds to the next phase measurement. After all are completed, it stops automatically.

b. Single-phase: Press the key, the key light turns on. Press the key, the key light turns on, the instrument starts measuring. 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, you must press the record key before the measurement operation. The key light turns on, and the instrument enters the automatic recording state, automatically recording the data of each subsequent measurement operation. If the power is cut off, if the three-phase continuous function is used for measurement, the instrument automatically records, 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" to complete printing. 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 the print key light and record key light to flash simultaneously, and the screen displays "Memory empty", cannot print.

C. Of course, if previous test data does not need to be retained, clear the data before measurement operation. Press the key. If the memory is already empty, the clear memory key light and record key light will flash simultaneously, and the screen displays "Memory already empty". If the memory is not empty, the screen displays "Clear memory?", then press the clear memory key again to clear the memory, or press any other key to abort clearing, and the screen displays "Abort clearing memory". When the memory is full, the and key lights 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 ratio value during measurement, press the key before measurement. The key light turns on, indicating that the measured ratio value can be displayed during measurement. Press the key again, the key light turns off, and the measured ratio value 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 this key again, the key light turns off. In most cases, this key light should be off.

c. key: If the group of a three-phase transformer is not known in advance, connect the three-phase transformer test leads, press the key, the key light turns on, press the key, the instrument starts working. It takes about 70 seconds, and the group and ratio test results will be displayed. The instrument does not analyze single-phase transformer groups; it is only 0 or 6. If the polarity is wrong, the group display window flashes to indicate an error. Some transformers may have errors when analyzing the group, but can measure normally with input parameters. The reason is that the symmetry of the transformer core laminations is poor, and when one column is excited, the magnetic distribution error in other columns is large.

d. key: Press the key, the instrument starts self-test. First, it lights up all displays in sequence for the operator to check, then checks whether the voltage divider and measurement circuit work normally.

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