Agilent Technologies NFA Series Performance Verification And Calibration Manual page 93

Equation 2-2
Measurement Jitter
Test Description
A noise source is connected to the NFA's input. The Analyzer then measures linear
Y-Factor over 100 samples. The standard deviation is then calculated using the
"non-biased" or "n-1" method. STDEV uses the following formula:
∑
n
σ
= ---------------------------------------- -
The linear value is then converted to Log10 to give the Y-factor Standard Deviation
with no averaging.
Test Specification
Jitter with no averaging: Y-factor Standard Deviation <0.10dB
Related Adjustment
None
Chapter 2
2
⎛ ⎞
∑
2
x – x
⎝ ⎠
( )
n n 1 –
Test Descriptions
Measurement Jitter
81