MODEL 8559APERFORMANCETESTS

PERFORMANCE TESTS

4-11. FREQUENCY SPAN ACCURACY(Cont'd)

f0.4 DIVISION

 

-d I 4

NINTH GRATICULE LlNE

 

FIRST GRATICULE LINE

 

 

NINTH SPECTRAL LlNE

COMB SIGNALS

 

FIRST SPECTRAL LlNE

 

CENTERFREQUENCY

FlGURE4-3. FREQUENCYSPAN ACCURACY MEASUREMENTFOR NINTHSPECTRALLINE

Set FREQ SPAN/DIV to 5 MHz. Adjust TUNING control to position one spectral line on the first graticule line. Measure the error between fifth spectral line and ninth graticule line. Error should be no greater than +0.4 division.

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Set comb generator COMB FREQUENCY- MHz for 1-MHz comb and increase OUTPUT AMPLITUDE control to maximum setting. Set spectrum analyzer FREQ SPAN/DIV to 2 MHz. Adjust TUNING control to position one spectral line on the first graticule line. Measure the error between 17th spectral line and ninth graticule line. Error should be no greater than k0.4 division.

div

Set FREQ SPAN/DIV to I MHz. Adjust TUNING control to position one spectral line at first graticule line. Measure the error between ninth spectral line and ninth graticule line. Error should be no greater than +0.4 division.

div

Set FREQ SPAN/DIV to 500 kHz. Adjust TUNING control to position one spectral line on the first graticule line. Measure the error between fifth spectral line and ninth graticule line. Error should be no greater than +0.4 division.

div

Set comb generator COMB FREQUENCY- MHz for 10-MHz comb. Adjust spectrum analyzer TUNING to position an in-band spectral line on the center graticule line (use SIC IDENT if necessary).