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YOKOGAWA WT310 User Manual

YOKOGAWA WT310
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2-11
IM WT310-02EN
Making Preparations for Measurements
1
2
3
4
5
6
7
App
Index
Continuous maximum allowable input
Voltage input
Peak value of 1.5 kV or rms value of 1.0 kV, whichever is less.
Current input
Direct input
WT310 and WT330
When the crest factor is 3: 0.5 A to 20 A
When the crest factor is 6: 0.25 A to 10 A
Peak value of 100 A or rms value of 30 A, whichever is less.
WT310
When the crest factor is 3: 5 mA to 200 mA
When the crest factor is 6: 2.5 mA to 100 mA
Peak value of 30 A or rms value of 20 A, whichever is less.
WT310HC
When the crest factor is 3: 1 A to 40 A
When the crest factor is 6: 0.5 A to 20 A
Peak value of 100 A or rms value of 44 A, whichever is less.
External sensor input
Peak value less than or equal to 5 times the range.
CAUTION
Use measurement cables with dielectric strengths and current capacities that are appropriate
for the voltage or current being measured.
Example: When making measurements on a current of 20 A, use copper wires that have a
conductive cross-sectional area of 4 mm
2
or greater.
Attaching a measurement cable to this product may cause radio interference in which case
the user will be required to correct the interference.
Note
If you are measuring large currents or voltages or currents that contain high frequency components, take
special care in dealing with mutual interference and noise when you wire the cables.
Keep measurement cables as short as possible to minimize the loss between the circuit under
measurement and the instrument.
The thick lines on the wiring diagrams shown in sections 2.9 to 2.11 are the parts where the current flows.
Use wires that are suitable for the current levels.
To make accurate measurements of the voltage of the circuit under measurement, connect the
measurement cable that is connected to the voltage input terminal to the circuit as closely as possible.
To make accurate measurements, separate the measurement cables as far away from the ground wires
and the instrument’s case as possible to minimize static capacitance to the ground.
To measure the apparent power and power factor more accurately on an unbalanced three-phase circuit,
we recommend that you use the three-voltage, three-current method (3V3A).
2.5 Precautions When Wiring the Circuit under Measurement

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YOKOGAWA WT310 Specifications

General IconGeneral
ModelWT310
CategoryDigital Power Meter
Current Measurement Range0.5 mA to 20 A
WeightApprox. 3.5 kg
Voltage Measurement Range15 V to 600 V
Frequency Range100 kHz
Basic Accuracy0.1%
Power Accuracy0.1%
DisplayLCD
InterfacesUSB, RS-232, GP-IB
Input Elements1
Dimensions213 mm x 88 mm x 346 mm

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