Measurement Jitter - Keysight NFA Series Performance Verification And Calibration Manual

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
83