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3.1 Adjusting and Correcting Values
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NOTE
Chapter 3
Useful Functions
3.1 Adjusting and Correcting Values
3.1.1 Auto-Zero-Adjustment Function
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
button.
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.
Summary of Contents for 3285-20
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