Hioki 3284 HiTester, Instruction Manual

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Chapter 2 Measurement Procedure
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NOTE
2.5 Auto-Zero-Adjustment/
Zero-Cancel Correction Function
2.5.1 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 . ADJ annunciator lights.
･
You can perform the auto-zero-adjustment, if the
counter displays within
4.5 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.
･
If you press
0ADJ/RESET
again during the auto-
zero-adjustment in the internal circuit, the auto-zero-
adjustment is canceled.
･
Do not perform auto-zero adjustment when using
auto range in the DC V mode. Always switch to the
range you will use (a manual range) before
performing the adjustment.