7-32
Section 7: Model 9100: Specifications
Final Width = 215mm
The equation yielding the actual amplitude uses the term Cos (Ø + Ø
ERROR
). The equation yielding the error free amplitude uses
the term Cos (Ø). 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 (0 + 0.15)
Cos 0
= 100 x 1 – 0.999996573
1
= 0.0003427%
The Total Power Uncertainty is therefore the rss of the individual contributions :
= (0.0463)
2
+ (0.096)
2
+ (0.0003427)
2
= 0.107%
Example 2:
Calibrator Output 100V, 3A (at 400Hz) Power Factor 0.5 (Ø = 60
°
).
1. Voltage Amplitude Uncertainty (From Section 7.4.1)
100V Specification :
= 0.04%Rdg
+
6.3mV(Floor)
= 0.04%
+
(6.3mV/100V) x 100
= 0.04%
+
0.0063%
= 0.0463%
2. Current Amplitude Uncertainty (From Section 7.19.7)
3A Specification :
= 0.08%Rdg
+
480
µ
A(Floor)
= 0.08%
+
(480
µ
A/3A) x 100
= 0.08%
+
0.016%
= 0.096%