YOKOGAWA WT310EH User Manual

2-7
IM WT310E-01EN
Measurement Conditions
1
2
3
4
5
6
7
8
App
Index
Current Range
WT310E
• Whenthecrestfactoris3,youcanselect20A,10A,5A,2A,1A,0.5A,200mA,100mA,50
mA,20mA,10mA,or5mA.
• Whenthecrestfactoris6or6A,youcanselect10A,5A,2.5A,1A,0.5A,0.25A,100mA,
50mA,25mA,10mA,5mA,or2.5mA.
WT310EH
• Whenthecrestfactoris3,youcanselect40A,20A,10A,5A,2A,or1A.
• Whenthecrestfactoris6or6A,youcanselect20A,10A,5A,2.5A,1A,or0.5A.
WT332E/WT333E
• Whenthecrestfactoris3,youcanselect20A,10A,5A,2A,1A,or0.5A.
• Whenthecrestfactoris6or6A,youcanselect10A,5A,2.5A,1A,0.5A,or0.25A.
Note
When the WT310E is measuring using one of the following fixed current ranges and receives excessive input
for a given period of time, to protect the input circuit, the WT310E forcefully changes the current range to 1 A
(0.5Aifthecrestfactoris6or6A)andswitchesfromfixedrangemodetoautorangemode.
• Whenthecrestfactoris3,youcanselect200mA,100mA,50mA,20mA,10mA,or5mA.
• Whenthecrestfactoris6or6A,youcanselect100mA,50mA,25mA,10mA,5mA,or2.5mA.
Auto Range (Auto)
This instrument automatically switches the range according to the size of the input signal.
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or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.
Note
When the auto range feature is enabled and an irregular pulse waveform is applied, a steady range may not
be maintained. If this occurs, specify a fixed range.
2.3 Setting the Measurement Range When Using Direct Input

YOKOGAWA WT310EH Specifications

General

Brand	YOKOGAWA
Model	WT310EH
Category	Measuring Instruments
Language	English