General Specification; Noise Figure; Gain - Keysight M9290A Manual

General Specification

Description

Noise Figure

b
10 MHz
10 MHz to 26.5 GHz
Noise Source ENR
4 to 6.5 dB
12 to 17 dB
20 to 22 dB
a. The figures given in the table are for the uncertainty added by the CXA-m Signal Analyzer instrument
only. To compute the total uncertainty for your noise figure measurement, you need to take into account
other factors including: DUT NF, Gain and Match, Instrument NF, Gain Uncertainty and Match; Noise
source ENR uncertainty and Match. The computations can be performed with the uncertainty calculator
included with the Noise Figure Measurement Personality. Go to
. Similar calculators are available on the Keysight web:
Calculator
b. Uncertainty performance of the instrument is nominally the same in this frequency range as in the higher
frequency range. However, performance is not warranted in this range. There is a paucity of available
noise sources in this range, and the analyzer has poorer noise figure, leading to higher uncertainties as
computed by the uncertainty calculator.
c. "Instrument Uncertainty" is defined for noise figure analysis as uncertainty due to relative amplitude
uncertainties encountered in the analyzer when making the measurements required for a noise figure
computation. The relative amplitude uncertainty depends on, but is not identical to, the relative display
scale fidelity, also known as incremental log fidelity. The uncertainty of the analyzer is multiplied within
the computation by an amount that depends on the Y factor to give the total uncertainty of the noise
figure or gain measurement.
See Keysight App Note 57-2, literature number 5952-3706E for details on the use of this specification.
Jitter (amplitude variations) will also affect the accuracy of results. The standard deviation of the
measured result decreases by a factor of the square root of the Resolution Bandwidth used and by the
square root of the number of averages. This application uses the 4 MHz Resolution Bandwidth as default
since this is the widest bandwidth with uncompromising accuracy.
Description

Gain

a
Instrument Uncertainty
b
10 MHz
10 MHz to 26.5 GHz
106
Specifications
Measurement Instrument
Range Uncertainty
0.05 dB
0 to 20 dB
0.05 dB
0 to 30 dB
0.1 dB
0 to 35 dB
Specifications
0.17 dB
Supplemental Information
Uncertainty Calculator
Using internal preamp (such as
Option P07) and RBW = 4 MHz
c
then select
Mode Setup
http://www.keysight.com/find/nfu
Supplemental Information
DUT Gain Range –20 to +40 dB
a
Uncertainty
.