The WT300E's wide range of functions and enhanced specifications, allows handling of all the measurement applications from low frequency to high frequency inverters using a single power meter.
Accuracy with fast display and update rate:
The WT300E series with the fast display update rate of 100ms, offer’s engineers a short tact time in their testing procedures. The basic accuracy for all input ranges is 0.1% rdg + 0.05% rng (50/60Hz) and DC 0.1% rdg + 0.2% rng.
Simultaneous Measurement:
U/I/P/Freq/Integ(+/-)/Harmonics components/ THD with max. 100ms cycle.
In addition to standard power measurements, the WT300E series measures all DC and AC parameters. Additionally, the WT300E series can measure harmonics and perform integration simultaneously without changing the measurement mode. The accompanying WTViewerFreePlus software can monitor and save the 200 parameters used.

Product pics: https://cdn.tmi.yokogawa.com/1/266/files/WT300_2062px.png

Brochures:

• Seria WT300E Digital Power Meter — https://cdn.tmi.yokogawa.com/1/2562/files/BUWT300E-01EN.pdf
• Sistem automat de calibrare pentru wattmetre — https://cdn.tmi.yokogawa.com/1/10895/files/LFPowerCalibrationSystem-01EN.pdf

Instruction Manuals:
Manual de utilizare WT310E/WT310EH/WT332E/WT333E — https://cdn.tmi.yokogawa.com/1/6196/files/IMWT310E-01EN.pdf