YOKOGAWA WT5000, Features Manual

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3-5
IM WT5000-01EN
Auto Voltage Range (Auto (Voltage), AUTO (VOLTAGE RANGE))
When auto range is turned on, the range change automatically according to 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.
760901 (30A High Accuracy Element), 760902 (5A High Accuracy Element)
Range increase
The measurement range is increased when any of the following conditions is met.
• The crest factor is set to CF3 or CF6 and the data of measurement function Urms or Irms exceeds 110% of
the measurement range.
• The crest factor is set to CF6A and the data of measurement function Urms or Irms exceeds 220% of the
measurement range.
• The crest factor is set to CF3 and the data of Upk* or Ipk* exceeds approximately 310% of the measurement
range.
• The crest factor is set to CF6 or CF6A and the data of Upk* or Ipk* exceeds approximately 620% of the
measurement range.
* Even if the null feature is on, the values are determined as if it were off.
• 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 all the following conditions are met.
• The data of Urms or Irms is less than or equal to 30% of the measurement range.
• The data of Urms or Irms is less than or equal to 105% of the next lower range.
• The crest factor is set to CF3 and the data of Upk* or Ipk* is less than or equal to 290% of the next lower
range.
• The crest factor is set to CF6 or CF6A and the data of Upk* or Ipk* is less than or equal to 580% of the next
lower range.
* Even if the null feature is on, the values are determined as if it were off.
• When a wiring unit is configured, the measurement range is decreased on all input elements in the wiring unit
when all the elements in the unit meets the range-decrease conditions described above.
• If you disable a measurement range in the valid measurement range settings, that measurement range is
skipped, and the auto range feature operates using only the valid measurement ranges.
• When non-periodic pulse waveforms are applied, the range may not remain constant. If this happens, use
the fixed range setting.
3 Input Settings (Basic Measurement Conditions)