Hioki 3332 - Page 40

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3.4 Selecting the Range
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NOTE
(3) Auto-ranging function
"AUTO" means auto-ranging function.
Shift level for auto-ranging function shows as follows;
① When the measured value exceeds 110% for range: range up
② When "OVER" illuminates: range up
③ When the measured value is under full scale of 30% and under 90% of the
lower range: range down
The 3332 can quickly move to the most suitable range through internal
circuitry. Therefore, when the auto-ranging function is on, the 3332 will not
necessarily go to the next range automatically. (However, only on the current
side). The range which was already set to OFF is skipped. To release the
auto-ranging function, press the
U
,
U
or
I
,
I
keys once.
･ In auto-ranging function sometimes range goes on up and down according to
distortion of input wave or size of measuring value. In this case, release
auto-ranging function and select range manually.
･ The current-measuring range will not automatically shift down unless the
peak measured value is below 90% of the high end of the lower range.
･ When auto-ranging is enabled, depending on the distortion of the input
waveform and the size of the measured values, range switching may be
unable to stabilize.
In this case, cancel auto-ranging and select the range manually. If a similar
type of behavior occurs with a manually selected range, switch to the next
higher range.
･ The OVER indicator is lit when peak value of voltage input and current input
waveform are over six times for range. In this case, internal circuit works
abnormally. Select the range not to lit the OVER indicator.
･ Even if it is either voltage or current, when massive input that will display
out of range (o.r.) is applied, sometimes other measuring values become
abnormal. Be sure to select ranges for voltage and/or current that will not be
out of range or lit the OVER indicator.
･ Apparent power shows out of range (o.r) when either voltage or current
shows same display.
･ Reactive power, power factor and phase angle shows out of range (o.r.) when
either active power and apparent power shows same display.
･ Power factor and phase angle shows out of range (o.r.) when apparent power is
0.
･ If the function's crest factor is exceeded (OVER is lit), the indicated data is
not correct.
･ After changing range, wait until the internal circuitry settles (5 seconds)
before reading the measurement value.