User Manual

8
Table 3 has two examples of uncertainty calculations.
The first is a 10 mW signal at room temperature. The
second is a 10 µW, 40 MHz signal at 50°C. Since this
measurement is at both low frequency and high tem
-
perature, the uncertainty will be increased. Note that
the RSS uncertainties are smaller than the values
from the rough estimate. This will always be the case.
Table 3 - Uncertainty Examples
Example 1
(10 mW,
Room Temp)
Example 2
(10 µW,
40 MHz, 50°C)
Error
Source
Percent
Uncert.
RSS
Term
Percent
Uncert.
RSS
Term
Cal. Uncert. 1.13 % 1.28 1.13 % 1.28
Freq. Resp. 3.42 % 11.70 3.42 % 11.70
Temp. Lin. 3.43 % 11.76 3.43 % 11.76
Other 0.5 % 0.25 1.6 % 2.56
Res. 0.005 % 0.00 0.5 % 0.25
Zero Set 0.00125 % 0.00 1.25 % 1.56
Noise 0.007 % 0.00 2 % 4.00
Sum Uncert. 24.99 33.11
RSS Uncert. 5.00 % 5.75 %
Quick Uncert. 5.01 % 16 %