Specifications

Chapter 1 1-11
Overview
Characteristics
Preamp ON:
Computed Measurement NF Uncertainty vs. DUT Gain, > 3 GHz
(Non-warranted Frequency Range)
Assumptions: Measurement Frequency 12 GHz, Instrument NF = 6.4 dB
1
, Instrument
VSWR = 1.5
2
, Instrument Gain Uncertainty = 2.2 dB, Instrument NF Uncertainty = 0.05
dB, Agilent 346B Noise Source with Uncertainty = 0.2 dB, Source VSWR = 1.25, DUT
input/output VSWR = 1.5.
Figure 1-6 NF Uncertainty vs. DUT Gains > 3 GHz, Preamp On
1. The preamp/analyzer combination NF is 6.4 dB; the internal preamp alone has a gain of 27 dB
and a NF of 5 dB.
2. Instrument VSWR is now that of the internal preamp; VSWR = 1.5
0
1
2
3
4
-10-5 0 5 1015202530
DUT Gain (dB)
Meas NF Uncert (dB)
NF = 5 dB
NF = 15 dB
NF = 10 dB