Power Meter Tutorials - Calibration

Yokogawa hopes that its Power meters contribute to a world with cleaner and more efficient energy use. The below tutorial intends to help with power measurement.

Calibration

1. Traceability of wide-bandwidth power meter
2. Calibration method for the working standard
3. Calibration at PF=0, Capacitor method
4. Calibration at PF=1

Traceability of wide-bandwidth power meter

Calibration method for the working standard

1. Voltage calibration
2. Current calibration
3. Phase angle measurement of the capacitor

• Preparing some capacitors each frequency (50/ 60/ 400/ 1k/ 2k/ 5k / 10k/ 20k/ 50k/ 100k/ 200k/ 500kHz)
• Measuring admittance (Conductance-G and susceptance-X) of the capacitor using precision LCR meter
• Calculating the phase angle of the capacitor

1. Power calibration at PF=0
   (It measures Internal phase difference between voltage and current input circuit.)
2. Power calibration at PF=1

Power calibration at PF=0

Calibration Method for working standard at PF=0

Capacitor's Equivalent Circuit

Consumption power of the resistor in the capacitor

Working standard displays power value (expectation)

Compensate of the input impedance of the voltage input circuit

Phase difference (_t) including the influence of input impedance of the voltage input circuit

Consumption power of the total admittance

Working standard displays power value

Power calibration at PF=1