YOKOGAWA WT310EH User Manual

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IM WT310E-01EN
Measurement Conditions
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App
Index
2. Press
SHIFT+▼(►)
to switch between direct input and external current sensor input.
3.
Use ▲ or ▼ to select the range.
Display D shows the range temporarily while you are changing it.
4.
Press CURRENT to confirm the setting.
TheCURRENTand▼and▲keylightsturnoff.
Note
For information on how to switch between the menu configuration and quick configuration modes for the
menu range, see section 2.3.
Explanation
External Current Sensor
The output of current sensors that produce voltage, such as shunts and clamps, can be applied to an
element’s external current sensor input terminal (EXT) and measured. Set the scaling constant and
the measurement range according to the external sensor’s conversion ratio before using the external
sensor for measurement.
Note
When using a current sensor that produces current, set the conversion ratio as the CT ratio.
External Current Sensor Scaling Constant
TheconversionratioisthenumberofmVthattheexternalcurrentsensoroutputswhenacurrentof1
A flows through it. Set the scaling constant to the conversion ratio.
Determining the Scaling Constant
Forexample,ifyouusetheYokogawa96030Clamp-onProbe,theconversionratiois2.5mV/A,
sowhen1Aofcurrentflowsthroughtheprobe,thecurrentsensoroutputis2.5mV.Setthescaling
constantto2.500.
Inthesamemanner,whenyouusethe96031,theconversionratiois1mV/A,sosetthescaling
constant to 1.000.
Whenyouusethe96001,theconversionratiois10mV/A,sosetthescalingconstantto10.00.
Note
The method of computing the scaling constant will be different if you use this instrument and an external
current sensor to replace the WT110, WT110E, WT130, WT200, WT210, or WT230, so you may have to
change the scaling constant. Set the scaling constant to the correct value in accordance with the above
explanation.
Setting All the Values or Individual Values (WT332E/WT333E)
On the WT332E/WT333E0, you can set the method for setting the scaling constant to ALL or EACH. The
default setting is ALL. The setting method selection menu will not appear on the WT310E or WT310EH.
• ALL:Selectthisoptiontosetallthescalingconstantsofeachelementtothesamevalue.
• EACH:Selectthisoptiontosetthescalingconstantsofeachelementindividually.
2.4 Setting the Measurement Ranges When Using an External Current Sensor (Option)

YOKOGAWA WT310EH Specifications

General

Brand	YOKOGAWA
Model	WT310EH
Category	Measuring Instruments
Language	English