Hioki CM7290, Инструкция по эксплуатации

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58
Troubleshooting
Problem Check Solution See
Display value is
lower than expected
• Is the filter function being
used
• Disable the filter function.
• If components of 60 Hz or
higher are present, the value
will be low.
p. 22
• Does the indicator
flash?
• The batteries have run low.
Replace with new batteries.
p. 27
• Does the frequency of the
current being measured fall
outside the range defined
in the product specifications
(for either the unit or the
current sensor)?
• Use a current sensor
that conforms with the
specifications.
• If the inverter's carrier
frequency is high, the display
value will be lower than the
total rms value.
p. 45
• Has the peak value
exceeded the product
specification?
• If possible, use a larger
current range.
• If that is not possible, use a
current sensor that conforms
with the specifications.
p. 16
Frequency measurement
• Are you measuring a special
waveform - of an inverter,
etc.?
• In frequency measurement,
a frequency value is
calculated from a count of
the number of times that a
particular threshold value is
exceeded. This means that
even in the case of a special
waveform, it may be possible
to measure it by changing
the mode – AC or AC+DC,
etc. – or changing the range.
−
• Is the current input value 300
dgt. or more of the range?
• Use an appropriate range
and/or an appropriate
current sensor.
p. 16