# How to calculate 50Hz active power measurement accuracy from datasheet?

The R&S HMC8015 power analyzer datasheet and technical data list:

## Range configuration

            CF3      Peak
voltage     600 V    ±1800 V
current     100 mA   ±300 mA


## Measurement accuracy (±reading in % ±peak range in %)

Frequency         ActivePower
45Hz < f < 66Hz   0.05 + 0.05


voltage, current: F = frequency in kHz

Power factor < 1 | ±(0.2 + 0.2 *F)%, only for active power

Does this mean that when range is set to 600 V, 100 mA and measuring these values:

• Urms = 229.96 V
• f = 49.986 Hz
• Irms = 15.33 mA (with peaks to 230mA)
• P = 0.064 W
• Q = 3.525 var
• Lambda = 0.018

That the measurement accuracy for active power can be calculated as follows:

1. 0.05% for reading + 0.2% for power factor < 1 = 0.25% of reading

plus

1. 0.05% for peak range + 0.2*F for power factor < 1 = 0.05 + 0.2 * 0.049986 ≅ 0.06% of peak value for range

resulting in a nett measurement accuracy of:

1. 0.06% of 0.064 W = 0.0000384 W

plus

1. 1800 V x 0.3 A = 600 * 0.06% = 0.36 W

totalling to ≅ ±0.36 W of measurement accuracy?