Hioki 3290-10, Instruction Manual

Page: 79 / 152

4.5 Current Integration
73
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M
easurement
P
ro
cedure
Starting Measurement
14.
Open the sensor clamp and clamp it around the conductor to
be measured, position the conductor at the center of the
clamp, and start measuring.
• The input impedance of the connected instrument should be at
least 1 M
Ω
to avoid affecting the displayed value.
• Output is unaffected by pressing the button.
• Use the optional 9445-02 AC ADAPTER for long-term record-
ing. If using the AC adapter with very noisy AC mains power,
displayed values may be unstable, or noise may appear in the
output, in which case connect the ground of the connected
instrument (data recorder) or L terminal at the recorder side to
earth ground.
(DC mode case)
Make sure that the direc
tion of current flow in the
conductor matches that
of the arrow on the
clamp.
SOURCE
LOAD
• The most precise measurements are obtained when the con-
ductor to be measured is centered in the clamp, to minimize
the effects of conductor proximity to the clamp. However, if the
conductor to be measured is not positioned orthogonally to the
clamp-on sensor, current measurements will be slightly
affected at higher frequencies.
• Measurement values may differ when the direction of the
clamp-on sensor is changed, but any such differences should
be within the specified accuracy.
• In AC, AC+DC, and Hz modes, the direction of current flow in
the conductor does not need to match that of the arrow on the
clamp.