New voltage-fluctuation/-flicker and cycle-by-cycle options have been introduced for the WT3000 three-phase precision power analyser, further optimising its performance. The instrument can be used to carry out normal flicker measurement, in which it calculates all the values of the relative steady-state voltage change, the maximum relative voltage change, the period during which the relative voltage change exceeds the threshold level, the short-term flicker value, and the long-term flicker value. It then compares them to preset limits, and provides a pass/fail judgment. The analyser can also be used to measure instantaneous flicker sensation and cumulative probability function. The cycle-by-cycle function takes measurements of parameters such as voltage, current and active power for each cycle, and then lists the data on-screen in a time series. This function is intended for use in situations where the measurement data exhibits significant fluctuations.
