DC resistance testerRegarding the internal battery instructions:

The instrument has a rechargeable battery pack inside and is equipped with a charging and discharging protection circuit.

Connect the external AC 220V power socket and start charging the internal battery, which is not controlled by the switch.

When the battery is fully charged, the charge discharge protection circuit will automatically reduce the charging current and control the charging voltage to protect the battery pack from overcharging. Continuous charging for one day and night will not damage the battery pack.

If the battery voltage of the battery pack is lower than the rated value *, the output of the battery pack will be cut off and the whole machine will not work to protect the battery pack from discharging.

Notes:

1. Select the appropriate range based on the measured resistance value of the transformer.

If the instrument malfunctions or starts incorrectly, the testing process should be terminated by pressing the "reset" button to initialize the system. During the reset process, the display should show "0000" for a few seconds before displaying the current value.

When testing the no-load voltage regulating winding, unless there is a short-circuit switch, it is not allowed to switch the tap changer before the discharge is completed.

Before dismantling the measuring line, be sure to wait for the charging and discharging indicator head to return to zero and the audio prompt to end.