Keysight Technologies FieldFox A Series User Manual page 580

Noise Figure Mode (Option 356 – CPU2 Only)
How to Define a Noise Figure Measurement
— User Calibration Noise Source Reflection Coefficient, ENR Uncertainties
— Controlling the Uncertainty Calculation and Display
580
As in the case of the DUT, In addition to entering the magnitude reflection
coefficient values, the uncertainty calculation takes into account the
Γ
distribution ( Distribution) and specified style (Spec Style) for the
preamplifier reflection coefficient value.
and ENR values (User Calibration Only):
These are identical to the noise source values entered for the measurement,
but are entered prior to performing the user calibration (Run User Cal).
For this section, see also
(Uncertainty > Uncert Contributions
When enabled, uncertainty bars are displayed on the data trace, indicating
the uncertainty range for the current Noise Figure, Noise Factor, or Noise
Temperature measurement. By default, the displayed uncertainty range is
the measured data +/- the default coverage factor of two times the
calculated standard deviation (2
uncertainties. Optionally, the coverage factor may be changed to 1
σ
3 . Also, as an aid in determining the cause of measurement uncertainty,
any of the individual contributors (user calibration (User Cal Uncert),
mismatch uncertainty (Mismatch Uncert), ENR uncertainty (ENR Uncert), or
jitter uncertainty (Jitter Uncert) may be excluded from the uncertainty
analysis.
"Overview of Softkey Menus" on page 555
on page 561).
σ
), which is based on all included
Keysight N9927-90001 User's Guide
σ σ
, 2 or