Yokogawa digital power meters

The WT3000-2A and WT210 digital power meters are certified to carry out the standby power tests specified in the IEC 62301 standard, which defines the standby mode as the lowest consumption of an appliance connected to the mains but not performing its main function.

IEC 62301 has been introduced in response to the need for power savings in household electrical appliances. Measurements of standby power are generally regarded as challenging because general-purpose power meters do not usually have the accuracy to measure low power values (typically less than 1 W) accurately.

In addition, average measurements over a period of time may be required to compensate for the effects of surges on the AC power lines.

The power meters feature a fundamental active power accuracy of 0.5% or better, measurements down to 0.01 W or lower and the capability of including components up to the 49th harmonic (2.5 kHz). Other key parameters which power meters comply with are total harmonic distortion (THD), crest factor, accuracy, resolution, stability at different power levels and the ability to record true average power over a period of more than 5 minutes.