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