12
17. "Time" table: it shows the test duration and is also used to calculate
the polarization index / absorption ratio
VI. Operation Instructions
The instrument should be charged before use (full charge time is 8 hours,
its indicator light change from red to green), in order to avoid power-off during
test. In addition, please use reference resistance and attachment apparatus to
check whether the instrument work properly and accurately.
Operation method as follows:
1. Preparation
Before wiring, make sure power switch is in “off” position, HV control knob
is in “exit” state. Measured target has disconnected power; all measured
terminals should be grounded via manual discharging rod. All these are safe,
you can connect wire.
For some measured targets suffering strong interference due to power
leakage such as substations, power plants, before wiring please complete and
carefully confirm above four operations, in order to avoid the risk of electric
shock. You can remove the manual discharging rod after completed
connecting wire.
2. Connect wire
Connect the two “-” terminal of the instrument to ground terminal/zero
terminals of measured target and the earth.
Connect “+” terminal to measured target such as transformer winding and
cable core.
Connect “Guard” terminal to protection ring of measured circuit in order to
eliminate the impact of surface resistance leakage.
3. Preselect test power
Counter-clockwise rotate “HV Preselect knob” to the desired value,
display value will increase from 0V to the maximum value.
