Fluke 9100 User Handbook Manual page 130

Final Width = 215mm
It is clear that at lower power factors the contribution from the Phase Uncertainty dominates. This demonstrates why most
calibrations are performed at Unity Power Factor (0 phase difference between channels). The following table illustrates the
amplitude uncertainties introduced due to a phase difference. The user can optimise the total power uncertainty by calibrating at
higher power factors.
Corresponding Channel Phase
Power Factor Difference
1 0
0.95 18.19
0.90 25.84
0.86 30.00
0.80 36.87
0.70 45.57
0.60 53.13
0.50 60.00
0.25 75.52
* For Calibrator output <65Hz
7-34 Section 7: Model 9100: Specifications
Amplitude Uncertainty due
to Phase*
Voltage <105V Voltage >105V
Current <20A Current <20A
0.0003% 0.0009%
0.0864% 0.1385%
0.1271% 0.2037%
0.1515% 0.2427%
0.1967% 0.3150%
0.2674% 0.4282%
0.3494% 0.5594%
0.4538% 0.7264%
1.0141% 1.6229%