YOKOGAWA WT500 User Manual page 105

IM 760201-01E
• Auto Range
• Press SHIFT+ (AUTO) to set the range automatically. The AUTO LED lights. The
measurement range is switched automatically depending on the amplitude of the input
signal as described below. The different ranges used in the auto range are the same
as those available for the fixed range.
• Range Increase
• The measurement range is increased when the data of measurement function
Urms or Irms exceeds 110% of the currently set measurement range.
• The measurement range is increased when the crest factor is set to 3 and the
peak value of the input signal exceeds 330% of the currently set measurement
range, or when the crest factor is set to 6 and the peak value of the input signal
exceeds 660% of the currently set measurement range.
• If all of the installed input elements are selected (all the element indicators are
lighted), the measurement range is increased on all input elements when any of
the elements meets the range-increase conditions described above.
• When a wiring unit is configured, the measurement range is increased on all
input elements in the wiring unit when any of the elements in the unit meets the
range-increase conditions described above.
• Range Decrease
The measurement range is decreased when the data of the measurement function
Urms or Irms is less than or equal to 30% of the measurement range and Upk
*
Ipk are less than or equal to 300% of the next lower range when the crest factor is
set to 3, or 600% of the next lower range when the crest factor is set to 6.
• If all of the installed input elements are selected (all the element indicators are
lighted), the measurement range is decreased on all input elements when all of
the elements meets the range-decrease conditions described above.
• When a wiring unit is configured, the measurement range is decreased on all
input elements in the wiring unit when all of the elements in the unit meet the
range-decrease conditions described above.
* Even if the NULL feature is on, the values are determined as if though it were off.
Note
When non-periodic pulse waveforms are applied during auto range, the range may not remain
constant. If this happens, use the fixed range setting.
4.4 Setting the Measurement Range for Direct Input
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* 7
and
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App
Index
4-9