Hioki 3284 HiTester, Instruction Manual

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Chapter 2 Measurement Procedure
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NOTE
2.2.3 Measuring AC/DC Current (AC+DC A)
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Just after suspension of input, or when modes are
switched under no input, the counter would not
become zero for about 10 seconds. This is normal
and simply reflects the workings of the internal
circuit. But you can measure with guaranteed
accuracy before the counter becomes zero.
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Depending on ambient temperatures, the counter
would not become zero under no input. If this
happens, perform a zero-cancel correction (2.5.2:
Zero-cancel correction function).
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During a f.s. input, the measurement response speed
is about 250 ms during rise (0% to 90%) and about
500 ms (100% to 10%) during fall (2.2.5, Figs. 1
and 2).
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The AC A mode does not allow measurement of DC
waveforms, full-wave rectification waveforms, half-
wave rectification waveforms, or DC+AC
waveforms (See 1.5: Modes).
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The 20 A range will display up to 25 A, however,
only the range from 1 A to 20 A can be displayed
with guaranteed accuracy.
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At any range, gross errors may occur at 1% or
below of the range ,whose accuracy is not
guaranteed, as a result of internal corrective
calculations.
1. Press to display .
2. Switch between the auto range and the manual range as
necessary.
3. Please execute auto zero adjustment before measuring.
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.)