Keysight Technologies N9040B UXA Manual page 35

Making Noise Figure Measurements
Calculating Measurement Uncertainty
The following procedure takes the measurement results on the amplifier in
"Making Basic Measurements" on page 14
the measurement uncertainty.
Step
MEAS SETUP
1. Press
Calculator
.
2. On the Measurement Uncertainty
Calculator dialog, toggle the
Automate settings from DUT Setup
and measurement results setting
to On.
3. If you are using a Keysight SNS noise
type, go to step 4 directly.
If you are using a Keysight 346x series
noise source, choose the model
number you are using from the
drop-down list.
For other noise sources, choose
Manual Noise Source
in the
NS ENR Uncert (dB)
and enter
NS Match
values manually.
DUT In Match
4. Enter the
Match
values and choose the spec
style and distribution.
Update at current CF
5. Click the
button to show the measurement
uncertainty for the current
measurement results. The following
figure shows the uncertainty calculator
screen.
N9069C Noise Figure Measurement Guide
Notes
Uncertainty Perform this step after the corrected measurement results are
,
obtained.
This will automatically fill the parameters required for the
measurement uncertainty calculation from the instrument and
measurement results.
Once the setting is set to On,
— the noise source type is set to
— the instrument type is set to
— the Ext Preamp type is set to
Then the parameters for these devices will be loaded from the
instrument automatically.
You can also change these types to
corresponding parameters manually.
NS:
type list
and
DUT Out
The values for DUT match can be either read from the data sheet or
and
measured. They can be entered as return loss (-XX.X dB), VSWR, or
reflection coefficient.
It is recommended that the spec style is set to Fixed.
If you need to calculate measurement uncertainty for other
frequency points, enter the frequency value in the box near the
Update at selected frequency
Update at selected frequency
results for that frequency.
section as an example, to calculate
is connected.
USB Preamplifier is connected.
Auto (SNS)
if an SNS
Auto
.
Auto
if an U7227-Series
Manual
and enter the
button, and click the
button to display the
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