GW Instek APS-1102 User Manual - Manual (Page 257)

9.5 Measurement Functions
APS-1102 Programmable AC/DC Power Source 9-9
 Output power measurement
Effective
power
Full scale: 1200 W
Display resolution: 1 W
Measurement accuracy: ±2% of the full scale (at 23 ±5°C)
(when output is 100 VA or above)
Apparent power:
Calculated as output voltage RMS value × output current RMS value
Full scale: 1400 VA
Display resolution: 1 VA
Measurement accuracy: ±2% of the full scale (at 23 ±5°C)
(when output is 100 VA or above)
Reactive power:
Calculated as (apparent power) 2 – (effective power) 2
Full scale: 1400 Var
Display resolution: 1 Var
Measurement accuracy: ±2% of the full scale (at 23 ±5°C)
(when output is 100 VA or above)
 Load power factor measurement: Calculated as effective power / apparent power
Measurement range: 0.00 to 1.00
Display resolution: 0.01
 Load crest factor measurement: Calculated as (  positive peak current  and  negative
peak current  maximum value) / RMS current
Measurement range: 0.00 to 50.00
Display resolution: 0.01
 Output harmonic current measurement
(AC - INT mode only, fundamental wave is 50 or 60 Hz only)
Measurement range:
To 40th harmonic of fundamental wave
Full scale: 15 Arms and 100%
Display resolution: 0.01 Arms and 0.1%
Measurement accuracy: 1% of full scale at RMS value current (at 23 ±5°C, to 20th harmonic)
±1.5% of full scale at RMS value current (at 23 ±5°C, from 20th to
40th)
Note: This measurement does not comply with the IEC standards.
 External synchronization frequency measurement
(external synchronization mode only)
Measurement range:
38.0 to 525.0 Hz
Display resolution: 0.1 Hz
Measurement accuracy: ±0.2 Hz (at 23 ±5°C, 50 or 60 Hz)