Iwatsu SS-500 Series Instruction Manual page 62

Measuring Currents
IMPORTANT
When you measure high-frequency currents, Clamping the
sensor around the high-potential side of a circuit may cause
common-mode noise to affect the measurement accuracy
adversely.
See "Influence of common-mode voltage" (p. 8 2).
As needed, reduce the frequency band of the waveform
measuring instrument, or clamp the sensor around the low-
potential side conductor.
Power
source
Displayed values can frequently fluctuate due to induction
potential even when no voltage is applied. This, however, is
not a malfunction.
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Load