PERFORMANCE TESTSMODEL8559A

 

PERFORMANCE TESTS

4-20. GAIN COMPRESSION (Cont'd)

 

PROCEDURE:

 

1. Set equipment controls as follows:

 

Spectrum Analyzer:

 

FREQUENCYBANDGHz

.................................................. .01-3

TUNING ..............................................................

0.050GHz

FREQ SPAN/DIV .........................................................

100 kHz

RESOLUTION BW ..............................................

300 kHz, uncoupled

INPUTATTEN .............................................................

10dB

REFERENCE LEVEL ....................................................

- 10 dBm

REFLEVELFINE ...........................................................

-10

Amplitude Scale ........................................................

10 dB/DIV

SWEEP TIME/DIV ........................................................

AUTO

SWEEPTRIGGER .....................................................

FREERUN

ALT IF .....................................................................

OFF

SIGIDENT .................................................................

OFF

BLCLIP ....................................................................

OFF

VIDEOFILTER .............................................................

OFF

Signal Generator:

 

COUNTERMODE ...........................................................

INT

AM ........................................................................

OFF

FM ........................................................................

OFF

FREQUENCYTUNE ......................................................

50MHz

RF ..........................................................................

ON

OUTPUTLEVEL ........................................................

-4dBm

2.Connect equipment as shown in Figure 4-16. Note that the 10-dB attenuator is placed between the power splitter and spectrum analyzer INPUT 5(M2 connector.

3.Adjust signal generator OUTPUT LEVEL control for a power meter reading of - 10 dBm (-20 dBm at spectrum analyzer INPUT 5(X2 connector).

4.Adjust spectrum analyzer TUNING control to center 50 MHz signal on CRT. Set Amplitude Scale control to 1 dB/DIV and adjust REF LEVEL FINE control to place peak of signal at a convenient horizontal graticule line other than top graticule line.

5.Adjust signal generator OUTPUT LEVEL control for a power meter reading of 0 dBm (- 10 dBm at spectrum analyzer INPUT 5(M2 connector).

6.Set spectrum analyzer REFERENCE LEVEL control to 0 dBm, leaving REF LEVEL FINE control at

setting established in step 4. Record deviation of signal peak from reference graticule line of step 4 (step- gain error). Values above reference line are positive (+); those below are negative (-).