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DANGER
●
Use a voltage detector to check a common earth of commercial power
supply.
●
Do not use this instrument to check a common earth of commercial
power supply.
A danger will be caused because the voltage may not be displayed even
in case of a live conductor, when the connection of the earth electrode to
be measured has come off, or when the connection of the test leads of
the instrument is not correct etc.
(3) Earth voltage check
●
Press the 2POLE button and select simplified measurement function.
Then, 2POLE mark is displayed on the LCD.
●
In the connection state of Fig. 9-3 or 9-4, check the earth voltage
displayed on the LCD. The earth voltage displayed in this state is the
voltage between C(H) and E terminals.
Display example
Fig. 9-5
Make sure that the voltage is less than 10 V. When the display reads 10 V
or more, a 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. 9-6
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.
Displayed at the lower
left of the LCD display
