Hioki 3285-20, Instruction Manual, Page: 50 / 85

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2.3 Voltage Measurement
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NOTE
2.3.4 Peak Hold Measurement
Be sure to use the test leads with the sleeves
attached when performing measurements in the CAT
III measurement category. In a CAT II environment,
if the tips of the test leads do not reach the
measurement object, remove the rigid insulating
sleeve before measuring.
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.
The polarity of the input is not displayed, even if DC
voltage is measured in this mode. If the connections
of test leads are moved, the measured values may
change, but the values are within the guaranteed
accuracy. (In case that you would like to measure DC
voltage which doesn't have AC components, you
should make the measurement in DC V mode.)
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 (See 2.2.2:
Measuring AC Current (AC A), Figs. 1 and 2).
Every range will display up to 125% of the range,
however, only the range from 10% to 100% can be
displayed with guaranteed accuracy.
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.
The peak value of measured voltage is retained on the display
to simplify reading. Peak fluctuations can also be viewed.
1. Press and select a measurement mode for the
measured circuit.
2. Insert the red test lead to V/
Ω
and the black test lead
to
COM
of the voltage/resistance input terminal.