POWER MEASUREMENT OF HIGH FREQUENCY LIGHTING SYSTEMS
Power Measurement of High Frequency Lighting Systems
Notes for actual measurement:
Since the inverter output is in the tens to hundreds of kHz range, the power factor error effect of the WT2000 (or 2532) cannot be ignored. In an actual measurement of a 100kHz input signal, phase delay of the WT2000 current side is estimated at approximately 6°and that of the 2532 is approximately 3 °.
Generally, since the power factor in an fluorescent light inverter measurement is close to 1, the power factor error effect is not so big compared to the amplitude error effect. (When PF=1 @ 6°phase delay the effect is cos(6 °) = - 0.5%, when @ 3 °delay the effect is cos(3°) = - 0.14%. On the other hand, the amplitude error is estimated at 2 to 5%)
Solution Features
- High accuracy measurements at high frequencies (output of ballast, couple dozen to hundreds of kHz)
- High stability measurements with digital filter system (special mode for lighting equipment is not necessary)
- High noise-resistance (excellent high-frequency Common Mode Rejection Ratio, CMRR)
- Harmonic analysis in conformity to IEC1000-3-2, voltage fluctuation and flicker measurements in conformity to IEC1000-3-3
- The WT2000 series enables you to set the measurement range for each
input element, permitting accurate measurement according to the level
of each input signal. The 3-phase 4-wire model permits measurement of
single-phase power and 3-phase power (3-phase 3-wire, 2-wattmeter
method), and the MATH function enables you to perform input-to-output
efficiency calculations. When you need different sensors to measure
large currents and high voltages, please contact your local YOKOGAWA
representative.
Power calibration system
- The WT2000 series has a high basic power measurement accuracy of
0.04% of rdg + 0.04% of rng (cos f = 1, 45 Hz to 66 Hz), and also the
effect of power factor is small, being 0.1% of rng (cos f = 0, 45 Hz to
66 Hz), hence you can use the instrument as a standard for calibrating
various wattmeters, reactive power meters, and power factor meters.
FG120: Yokogawa 2-channel
Synthesized Function Generator
2558: Yokogawa AC Voltage/Current Standard
- Measurement of cooling and heating performance of air conditioners
The WT2000 series has a wide bandwidth (DC and 2 Hz to 500 kHz) and
high accuracy (0.04% of rdg + 0.04% of rng), and can directly measure
inputs of up to 30 A. It is therefore suitable for evaluating the
stability of an air conditioner in an environmental test chamber during
measurement of the cooling and heating performance, and also for
measuring electric power and electric power quantity after evaluating
the stability.
