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IM WT310E-01EN
Features
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App
Index
Measurement Ranges (For procedures, see section 2.3)
Specify the measurement ranges in accordance with the rms values of the voltage and current that you
want to measure. You can specify fixed measurement ranges or have the ranges set automatically.
Fixed Ranges
You can select a range from various options. Even if the size of the input signal changes, the selected
range will not change. For voltage, when the crest factor is set to 3, the maximum range that you can
select is 600 V, and the minimum range that you can select is 15 V.
When the crest factor is set to 6 or 6a, the maximum range that you can select is 300 V, and the
minimum range that you can select is 7.5 V.
Auto Range
This instrument automatically switches the range according to the size of the input signal. The ranges
that this instrument switches between are the same ranges that you can select as fixed ranges.
Range Increase
The range is increased when any of the following conditions is met.
• Crest factor 3
Urms or Irms exceeds 130% of the measurement range.
Upk or Ipk exceeds approximately 300% of the currently set measurement range.
• Crest factor 6
Urms or Irms exceeds 130% of the measurement range.
Upk or Ipk exceeds approximately 600% of the currently set measurement range.
• Crest factor 6A
Urms or Irms exceeds 260% of the measurement range.
Upk or Ipk exceeds approximately 600% of the currently set measurement range.
On the WT332E/WT333E, when any of the equipped input elements meets any of the above
conditions, the measurement range is increased.
Range Decrease
The range is decreased when all of the following conditions are met.
• Crest factor 3
• Urms or Irms is less than or equal to 30% of the measurement range.
• Urms or Irms is less than or equal to 125% of the next lower measurement range.
• Upk or Ipk is less than or equal to 300% of the next lower measurement range.
• Crest factor 6, 6A
• Urms or Irms is less than or equal to 30% of the measurement range.
• Urms or Irms is less than or equal to 125% of the next lower measurement range.
• Upk or Ipk is less than or equal to 600% of the next lower measurement range.
On the WT332E/WT333E, when all the input elements meet all the above conditions, the
measurement range is decreased.
Range Skipping (For procedures, see section 2.6)
You can select which measurement ranges to skip (range configuration). Measurement ranges that are
not used are skipped, and this instrument switches between the measurement ranges that you have
chosen to enable. For example, when using the auto range feature to measure the current of a device
that produces 5 A in operation mode and 500 mA in standby mode, you can configure range skipping
so that the 1 A and 2 A ranges are disabled. When you are measuring the current of the device in
standby mode in the 500 mA range and the device switches to operation mode, the intermediate 1 A
and 2 A ranges are skipped, and the device switches to the 5 A range. Range skipping can reduce the
loss of measured data that can occur when ranges are switched one by one.
You can turn range skipping on and off from the display menu of this instrument. You can specify
which measurement ranges to skip by sending communication commands through the communication
interface or by using WTViewerFreePlus.
1.2 Measurement Conditions
