By hvhipot 
1. After measuring the inductive load, the test line cannot be directly removed, so as not to endanger the safety of testers and equipment due to inductive discharge. The output terminal of this machine is equipped with a discharge circuit. After the instrument is reset, the inductance will discharge energy through the instrument. The test line must be removed after the discharge instruction is completed.
2. For no-load voltage-regulating transformers, it is not allowed to switch the tap switch during the measurement process.
3. If the power supply is suddenly cut off during the measurement, the machine will automatically start to discharge. Please do not disassemble the wiring immediately. Wait at least 30 seconds before disassembling the wiring.
4. During measurement, do not short-circuit the grounding of other untested windings, otherwise it will slow down the magnetization process of the transformer, prolong the data stabilization time or the value is incorrect.
5. Please check the power supply voltage before starting up: AC 220V±10%, 50Hz.
6. During the test, please confirm that the device under test has been powered off and disconnected from other live devices.
7. The case must be grounded reliably during the test.
8. Irrelevant items are not allowed to be stacked on and around the equipment panel during the test.
9. When replacing the fuse and accessories, please use the same model as this instrument (see technical specifications for details)
10. Pay attention to moisture and oil pollution for this instrument.
11. When selecting the current, please refer to the range in the technical index column. When the range is exceeded, the instrument is always in the “charging” state because the current does not reach the preset value. At this time, press the reset button to reset the instrument and select a smaller value. The current gear.