1. This instrument can only be used on equipment that has been de-energized; the grounding terminal should be reliably connected to the grounding grid,

and the instrument should be used in a spacious, safe, and reliable location as much as possible.

2. The equipment under test should be disconnected from the high-voltage leads and switched from operational status to maintenance status, cleaned, and after preliminary insulation tests are satisfactory, the instrument can be used for testing to prevent damage to the instrument during voltage application due to poor insulation of the equipment under test.

3. Determine the wiring method based on the installation situation of the equipment, and select the corresponding wiring method in the relevant menu options.

4. Correctly select the test voltage level according to different equipment, and choose the required voltage in the corresponding menu options.

5. In case of special situations that endanger safety during testing, the main power supply can be urgently turned off.

6. Only after turning off the power switch on the panel and clearly disconnecting the 220V test power supply can wiring changes be made or work be concluded; when repeating tests on the same test equipment, press reset and then measure again, or choose to repeat after the previous test is completed.

7. To ensure measurement accuracy, especially when the loss of small capacitance test samples is small, it is necessary to ensure that the low-voltage end (or secondary end) of the equipment under test has good insulation and measure in an environment with relatively low humidity.

8. When conducting tests on large capacitance test samples, the grounding of the instrument and the grounding of the test sample should not be at the same grounding point to prevent back-surge voltage or traveling waves from affecting the safety of the instrument during grounding discharge.

9. The instrument comes with a voltage boosting device; attention should be paid to the insulation distance of high-voltage leads and personnel safety; 10. The instrument should be reliably grounded; poor grounding may cause machine protection or danger.

10. After the instrument is started, except for special circumstances, it is not allowed to suddenly turn off the power to avoid overvoltage damage to the equipment;

11. Although the special high-voltage wire (HVx) provided with the instrument has been tested and qualified at the factory, it should still be kept away from the human body and low-voltage test lines (Cx) during measurement; neither the high-voltage core wire nor the high-voltage shielding wire is allowed to be grounded or connected to the low-potential part of the test circuit.

The core wire and shielding wire of the CX input line must not contact the high-voltage part of the test circuit.

12. The instrument should be protected from moisture and severe vibration.

13. When on-site interference is significant and power frequency measurement cannot yield definite results, use heterodyne frequency measurement; otherwise, use power frequency measurement.

14. If after issuing a measurement command, the measurement result does not appear on the screen for a long time (1 minute), it may be due to excessive capacitance of the test sample or a system crash; restart the instrument and reduce the measurement voltage before measuring again.