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Precise Measurement for Earth Resistance
(Precise Measurement Method, Three-pole Method)
• This device automatically detects AC/DC ( / ) of the
earth potential.
If AC/DC needs to be switched, it can be switched by pressing
DISPLAY button while the current earth potential has been
displayed.
• To check earth potential
After measurement of earth resistance, press DISPLAY button
while is lit up so that the earth potential will be displayed.
When is lit up, press Fn button so that the retained
value is unlocked and the current earth potential will be
displayed.
When OPEN Appears
This device automatically check whether or not each earth
resistance is within the allowable range by measuring the earth
resistance of the auxiliary earthing rod prior to measuring the
resistance of the earthing electrode E.
If the earth resistance of the auxiliary earthing electrode exceeds
the allowable range, OPEN appears below the measurement
terminal that exceeds the allowable range and the earth resistance
of the earthing electrode E will not be measured.
Countermeasures when OPEN appears
Take the following actions for the auxiliary earthing rod connected
with the measurement terminal for which OPEN appears.
• Pour water
• Stick in deeper
• Insert the auxiliary earthing rod into another location
• If the clip connecting point is dirty, wipe and clean the auxiliary
earthing rod with a soft cloth.
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