Gain Compression Test; Gain Compression Test Setup - HP 8566B Adjustment Manual

Gain compression is measured by changing the power level at the
spectrum analyzer input mixer from -15 dBm to -5 dBm (2 to 22
indicating gain compression of the input mixer. Since a 10 dB change
in IF gain is used to keep the signal trace near the same point on
the display when the input power is increased, the error due to this
IF gain change is first measured, then subtracted from the displayed
deviation to give the deviation due to gain compression only.
Figure 2-32. Gain Compression Test Setup
Synthesized Signal Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8340A
Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..HP436 A
Power Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..HP8485 A
Adapter, Type N (m) to SMA (f) (2 required) . . . . . . . . . . . . . . .1250-1250
Adapter, Type N Female Connectors . . . . . . . . . . . . . . . . . . . . . . . 1250-0777
Adapter, SMA (f) to SMA (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1250-1158
Adapter, BNC Tee (m)(f)(f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-0781
Low Loss Microwave Test Cable (APC 3.5) . . . . . . . . . . . . . . . . 8120-4921
1. Press (21, lsHlFTl lATTENj, CsHiFTl $oj 0 dBm on the
spectrum analyzer. Set FREQ REFERENCE switch
of analyzer to INT and set FREQ STANDARD switch on rear panel
of synthesizer to EXT.
2. Set synthesizer frequency to 2000.000 MHz. Set other synthesizer
controls as follows:
ALC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INT
AM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
FM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
RF OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ON

18. Gain Compression Test

on rear panel
Performance Tests 2-77