The WT310 is a single phase, portable unit, with the capability of measuring low currents from 50 micro-Amps up to 20 Amps RMS and a voltage ranges from 15 to 600 Volts RMS. The WT310 was designed to accurately measure conversion circuits that use energy saving switching techniques that can cause distorted voltage or current waveforms with high harmonic content. A high resolution sixteen bit Analog to Digital converter, a digitizing rate of 100 kS/s and a bandwidth from DC and 0.5 Hz to 100 kHz allow the WT310 to perform these complicated measurements with ease. 

An optional Harmonic Analysis function is a must for design and test engineer in product evaluation and power quality testing. Normal power parameters and Harmonic data are measured simultaneously, providing faster, more accurate power analysis. Harmonic Analysis and THD Computations can be calculated up to the 50th order from a 50 or 60 Hertz fundamental frequency. The Integration function measures Amp-Hour and Watt-Hour parameters. A new Auto Range feature has been added to the Integration, which is especially important for stand-by-power measurements. In the stand-by mode the current can be very low. Then when the device goes to operation mode, the current can increase substantially. The new Auto Range feature optimizes the range setting for maximum accuracy measurements. Yokogawa’s "Average Active Power" function makes it possible to measure power consumption under conditions where the power fluctuates greatly. Watt-hours are measured over some time period, then the time is divided out to leave an average power reading. This is the preferred method for Stand-by-Power measurements. All industry standard communication interface ports such as USB, GPIB, RS232C and Ethernet are available for the WT300 Series of Power Meters. The standard interface is USB plus GPIB or RS232C, with Ethernet as an available option. Yokogawa’s WTViewer Free Plus software is provided with each WT300 unit. IEC62301 software for stand-by-power measurements is also available as a free download.