Hioki 3285-20, Instruction Manual, Page: 83 / 85

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5.3 Troubleshooting
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The measured value is smaller than the estimated
value.
Current / Voltage measurement:
Check that the clamp sensor is firmly closed. (At current
measurement)
Check that the test leads are fully connected. (At voltage
measurement)
Check that the frequency of the measured circuit is
within the range provided in the specifications. (A
smaller value will be displayed for a high inverter carrier
frequency.) *Items within parentheses apply to current
measurement only
Check that the proper steps have been taken, according to
procedure described in 3.1.1: Auto-zero adjustment
function and 3.1.2: Zero-cancel correction function.
Check that you're using the proper mode. (See 1.5:
Modes.)
Check that the peak value is below the circuit dynamic
value provided in the specifications. (To check
transitional peak values, see Notes in 2.2.4 and 2.3.4:
Peak Hold Measurement.)
Check that the crest factor (peak value / RMS value) is
below the circuit dynamic value provided in the
specifications.
Check that the battery warning annunciator is off.
Frequency measurement:
Check the waveform. Some special frequencies can't be
measured, such as those of inverters.
Check that the input value corresponds to 10% or more
of the range.