64 N9069C Noise Figure Measurement Guide
Measurement Related Tasks and Concepts
Setting the Signal Analyzer to Make a Measurement
Entering Excess Noise Ratio (ENR) Data
You can enter ENR data under Meas Setup for the noise source you are using
as a table of values or as a single spot value. The values held in the table can
be used for measurements at a range of frequencies as well as at a fixed
frequency.
The single spot value is used either for measurements at a single frequency, or
for measurements across a range of frequencies that is narrow enough such
that the ENR value does not change significantly across that range.
There are two types of noise source. The first type, for example, a Keysight
346B, is a noise source that is powered by a 28 V supply on the rear
panel of the analyzer. These noise sources need their ENR data to be entered
manually, either by using the Alpha Editor or by transferring the data from the
diskette supplied with the Keysight noise sources to a USB storage device. See
“Entering ENR Table Data for Noise Sources” on page 65
for more information.
The other type of noise source, for example, a Keysight N4000A, is known as a
SNS Noise Source. These SNS Series Noise Sources connect directly to the
analyzer SNS connector on the rear panel and their ENR data is downloaded
automatically into the analyzer.
The tasks related to “entering ENR data” in this section are listed below:
“Selecting a Common ENR Table” on page 65
7
External LO Control
On/Off
Allows you to toggle the external LO control on and off through LAN, USB, or
GPIB interface.
8
LO Power
Allows you to set the LO power level in dBm units.
10
DUT Input (RF)
Start/Stop
Allows you to set the RF start and stop frequencies. RF here refers to the
frequency or frequency range before the DUT.
12
DUT LO
Start/Stop
Allows you to set the LO star and stop frequency. LO here refers to the
frequency or frequency range of the DUT LO.
11
DUT Output (IF)
Fixed
Allows you to set the IF fixed frequency. IF here refers to the frequency or
frequency range after the DUT.
9
Sys Downconv
IF
Allows you to set the tuned frequency of the system downconverter output
when the LO Frequency mode of the system downconverter is set to Swept.
This will be the input frequency of the signal analyzer.
LO
Allows you to set the external LO frequency of the system downconverter when
the LO Freq Mode of the system downconverter is set to Fixed. The input
frequency of the signal analyzer can be calculated by subtracting the System
Downconv LO from the
.
On/Off
Allows you to specify whether or not the system downconverter is to be used
in the measurement.
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Summary of Contents for CXA N9000B
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