Fluke 9100 User Handbook Manual page 129

3. Amplitude Uncertainty due to Phase Uncertainty (From Section 7.19.9)
Specifications:
Combined Phase Uncertainty
Ø
ERROR
Again, the equation yielding the actual amplitude uses the term Cos (Ø + Ø
error.
Amplitude uncertainty
The Total Power Uncertainty is therefore the rss of the individual contributions :
Voltage Phase Uncertainty = 0.07 + 0.001 x (400-65)
= 0.405
Current Phase Uncertainty = 0.08 +0.0008 x (400-65)
= 0.348
= 0.405 + 0.348
= 0.753
). These have to be combined to yield a percentage
ERROR
= 100 x 1 – Cos (Ø + Ø )
ERROR
Cos Ø
= 100 x 1 – Cos (60 + 0.753)
Cos 60
= 100 x 1 – 0.488575
0.5
= 2.285%
2 2
= (0.0463) + (0.096)
= 2.287%
Section 7: Model 9100: Specifications
2
+ (2.285)
Final Width = 215mm
7-33