The WT300 Series Digital Power Meters are the 5th generation of Yokogawa’s highly recognized high performance low cost product group. They offer updated and innovative measurement functions which will benefit the engineer with basic electrical power measurements. They are the ideal measurement solution for doing Stand-by-Power measurements, Energy Star®, and IEC62301 testing, Battery Charger and other low level power measurements.
The WT300 series digital power meters offer users the high performance and reliability customers have come to trust from Yokogawa.
- Basic accuracy: 0.1% of Reading
- DC measurement: 0.5 Hz to 100 kHz frequency range
- Measures all AC and DC parameters
- Compact design (half-rack size)
- Standard USB, and GPIB or RS232 Interfaces
- Low current measurements down to 50 micro-Amps (WT310 only)
- High current measurements up to 40 Amps RMS (WT310HC only)
- High-speed data update (up to 10 readings per second)
- Simultaneous Normal and Harmonic measurements
- Optional Ethernet interface
- WTViewerFreePlus Software included
- Single Phase measurements with the WT310 series
- Split Phase and Three Phase measurements with the WT300 series
The WT300's enhanced specifications and its wide range of functions let you handle all your measurement applications from low-frequency to high-frequency inverters using a single power meter.
First in Class:
Auto ranging function available in selected ranges.
The auto-range function is used to select or change the range automatically in specific ranges. This results in shorter range changing times, allowing more quick and efficient testing.
First in Industry:
Integration measurement auto ranging function.
Typically, when power meters operate in an integration mode to measure power consumption and standby power, the measuring ranges need to be fixed. However, if the level of the input exceeds the maximum of the selected range, the test will need to be repeated. The WT300 Series has a high speed automatic ranging capability in integration mode, which removes the need to repeat any test.
Comparison of WT210/230 with WT310/330
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WT310/WT332/WT333
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WT310HC
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WT210/WT230
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| DC power measurement accuracy |
0.1% of reading+0.2% of range
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0.3% of reading+0.2% of range
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0.3% of reading+0.2% of range
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| Current range (Crest factor=3)Voltage and current basic accuracy |
Direct Input |
5m/10m/20m/50m/100m/200m/
0.5/1/2/5 /10/20[A]（ WT310） 0.5/1/2/5/10/20[A]（WT332/WT333 |
1/2/5/10/20/40[A]
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5m/10m/20m/50m/100m/200m/
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| External current input |
EX1: 2.5/5/10[V]
EX2: 50m/100m/200m/500m /1/2[V] (OP.) |
EX1: 2.5/5/10[V]
EX2: 50m/100m/200m/500m /1/2[V] (OP.) |
EX1: 2.5/5/10[V]
EX2: 50m/100m/200m[V] (OP.) |
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| Effective input range for voltage & current (CF=3) |
1% to 130%
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1% to 100% (40A range only)
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1% to 130%
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| Maximum displaying value for voltage & current (CF=3) |
1% to 140%
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1% to 110% (40A range only)
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1% to 140%
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| Effect of Power Factor (CF=3) | 0<PF<1 |
Power reading x {power reading error + (power range / apparent power reading) + tanφ x (influence when PF = 0)} %
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Power reading x {power reading error + (power range / apparent power reading) + tanφ x (influence when PF = 0)} %
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Add the power reading x {tanφ x (influence when PF = 0)}%.
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| Simultaneous measurement of RMS, Voltage MEAN & DC |
Yes
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Yes
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No
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| Frequency measurement |
2 channels (voltage & current) |
2 channels (voltage & current)
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selected voltage or current (one)
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| Number of display items |
4 items
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4 items
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3 items
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| Sampling rate |
Approximately 100 kS/s
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Approximately 100 kS/s
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Approximately 50 kS/s
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| Harmonic measurement |
Yes (OP, /G5)
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Yes (OP, /G5)
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Yes (OP, /HRM)
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| THD calculation maximum order setting |
Yes (OP, 1-50th)
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Yes (OP, 1-50th)
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No
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| Auto ranging of integration |
Yes
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Yes
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No
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| Communication interface | USB |
Yes
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Yes
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NO
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| GP-IB |
Yes GP-IB or RS-232
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Yes GP-IB or RS-232
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Yes (OP) GP-IB or RS-232C
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| RS-232 |
Yes RS-232 or GP-IB
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Yes RS-232 or GP-IB
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Yes RS-232 or GP-IB
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| Ethernet |
Yes (OP)
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Yes (OP)
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NO
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| IEEE standard for GP-IB |
IEEE488.2
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IEEE488.2
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IEEE488.1 and IEEE4882.
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| Comparator function |
No
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No
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Yes
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| Viewer software |
Free (included)
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Free (included)
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Free (download)
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