A new high-speed data-capture option has been introduced for the Yokogawa WT1800 precision power analyser. The new /HS option provides fast, accurate measurements of power parameters such as voltage, current, power, torque, speed and mechanical power with millisecond response. This allows it to capture numeric data on the change of status during one rotation of a motor when the motor is started, when the rotation speed changes, or when the load condition varies.
This new function takes advantage of the WT1800's sampling frequency (up to
2 MS/s) and its unique ability to carry out calculations on measured parameters in real-time. The new high-speed data-capturing function can measure 3-phase voltage/current/power and torque/rotation speed/mechanical power every 5 ms (when external synchronisation is off) or every 1-100 ms (depending on the clock signal frequency) if external synchronisation is on. It transmits a block of data every second to an internal or external memory or to a PC using a communications interface. Every second, the WT1800 updates its displays with the previous one second of data. The average characteristic is set using the cutoff frequency of the high-speed filter for measured data during the 5 ms or 1-100 ms period. The cutoff frequency can be varied from 1 Hz to 1 kHz in 1 Hz steps.
