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Chapter 3 Technical Information
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(3) External noise
When measuring earthing resistance, leakage
current from connected equipment, earth
voltage caused by earth current, and auxiliary
earthing resistance can affect the measurement
and cause erroneous readings.
To eliminate such influences as much as
possible, the 3151 uses a newly developed AC
phase differential method to measure earthing
resistance. This assures accurate results also
under difficult conditions.
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