(2) Earth voltage check
● Press the 3POLE button and select precision measurement function.
Then, 3POLE mark is displayed on the LCD.
● In the connection state of Fig. 9-10, check the earth voltage displayed
on the LCD. The earth voltage displayed in this state is the voltage
between P(S) and E terminals.
Display example
Fig. 9-11
Make sure that the voltage is less than 10 V. When the display reads 10 V
or more, the warning LED as shown below lights up. (The warning LED
lights up at 5 V or more for an earth voltage of 400 Hz.)
Red LED lights up. Fig. 9-12
Excessive errors in earth resistance measurement may be caused in the
condition that warning LED for high earth voltage is lighting up. To avoid
this, make measurement after reducing the voltage by turning off the
power supply of the equipment under test etc.
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