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Chapter 2 Measurement Procedure
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NOTE
2.2 Current Measurement
2.2.1 Measurin
DC Current
DC A
･ Accurate measurement may be impossible in
locations subject to strong external magnetic fields,
such as transformers and high-current conductors, or
in locations subject to strong external electric fields,
such as radio transmission equipment.
･ Make sure that only one conductor is clamped in
the center of the clamp sensor. If you clamp single-
phase (2-wire) or three-phase (3-wire) lines together,
it will be impossible to measure.
･ The display may show a measured value bigger than
the actual value due to a magnet:c field interference.
The interference is less than 2 A during the
measurement.
1. Press
to display .
2. Switch between the auto range and the manual range
as necessary.
3. Press
0ADJ/RESET
to make an auto-zero-adjustment
(without clamping the measured conductor inside
the clamp sensor) with the clamp sensor firmly
closed. (see 2.5.1: Auto-zero-adjustment function).
ADJ
annunciator lights to indicate that auto-zero-
adjustment is complete. (If you make an auto-zero-
adjustment in the auto range, two current ranges will
be adjusted in this mode.)
4. Open the top ends of the clamp core, orient the
current direction indicator on the clamp in the
current direction of the measured conductor, and
clamp the conductor so that it passes through the
center of the clamp core.
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