Hioki 3285 - 2.5 Auto-Zero-Adjustment;Zero-Cancel Correction Function; 2.5.1 Auto-Zero-Adjustment Function

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Chapter 2 Measurement Procedure
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NOTE
NOTE
2.5 Auto-Zero-Adjustment/
Zero-Cancel Correction Function
2.5.1 Auto-Zero-Ad
j
ustment Function
･ For a long term measurement, use the optional
9445-02 or 9445-03 AC ADAPTER.
･ When the AC adapter is used and there is a large
amount of noise in the power line, the display may
show several counts or noise may be present in the
output. In such a case, connect the ground terminal
of the level recorder or the L side of the input to
ground.
The auto-zero-adjustment function is used to adjust
offsets in the internal circuit automatically that
result from temperature characteristics or clamp
sensor magnetization. The clamp core is
magnetized during a large DC current measurement,
or when a powerful magnet is placed close to the
clamp core.
1. Wait until the counter is stable under no input.
Then, press
0ADJ/RESET
.
ADJ
annunciator lights.
･ You can perform the auto-zero-adjustment, if the
counter displays within ±45 A in a current mode.
･ When there is an input or the counter decreases, the
measurement accuracy will be spoiled by pressing
0ADJ/RESET as well as the accurate auto-zero-
adjustment. If inaccurate auto-zero-adjustment is
performed, perform the correct procedure again.
･ It would take approximately 20 seconds to stabilize
the counter in AC+DC A mode.
･ Use the zero-cancel correction function if the
counter fails to revert to zero after correct auto-zero-
adjustment in AC+DC A mode.
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