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Noise Figure Mode (Option 356)
How to Define a Noise Figure Measurement
— Noise Source Reflection Coefficient, ENR Uncertainties, and ENR values:
Template *.enr files for several common models of noise sources may be
found in the default ENR table directory of the FieldFox. In these files, the
reflection coefficients have been set to the values specified for the
respective model numbers, but the values for the ENR or ENR uncertainty
will need to be entered at each frequency. Refer to
page
— Preamplifier Reflection Coefficients (User Calibration Only):
Template preamplifier (*.amp) files for several common models of
preamplifiers may be found in the default
FieldFox. In these files, the reflection coefficients have been set to the
values specified for the respective model numbers.
DUT and preamplifier *.snp files may be generated in the FieldFox VNA
mode, and then imported into the Noise Figure mode.
712
For this section, see also
Source
on
page
683) and
Noise source reflection coefficients, ENR Uncertainties, and ENR values
may be entered by Recalling a previously generated *.enr file, editing an
ENR table, or set as a spot value to be applied across all frequencies. Note
that any *.enr file which uses the standard *.enr file format may be recalled
by the Noise Figure mode.
715.
As in the case of the DUT, in addition to entering the magnitude reflection
coefficient values, the uncertainty calculation takes into account the
distribution and specified style for the noise source reflection coefficient
value. Additionally, the ENR table requires a value for the ENR uncertainty
coverage (Uncert Coverage), which states how the entered ENR uncertainty
(ENR Uncert) value is related to the population of possible ENR
uncertainties. This is typically set to 2
the actual ENR is within the range of ENR +/- ENR Uncertainty.
For this section, see also
Preamp
(Uncertainty
>
When a user calibration is performed, the Preamplifier Reflection
Coefficient values may be imported to a Preamp table from *.snp or *.csv
files, entered by editing a preamplifier table (Preamp Table), recalled as a
previously saved preamp table (in a *.amp file), or set as a spot value to be
applied across all frequencies.
"Overview of Softkey Menus" on page 682
"Using ENR Tables" on page
σ
which means that 95% of the time,
"Overview of Softkey Menus" on page 682
page
689).
on
Preamp
Keysight N9915-90020 User's Guide
(Noise
714.
"ENR (*.enr) Files" on
table directory of the
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