PERFORMANCE TESTS

MODEL 8559A

PERFORMANCE TESTS

NOTE

Perform the Front Panel Adjustment Procedure in Section Ill before proceeding with performance tests. Allow at least 30 minutes warmup time.

4-11. FREQUENCY SPAN ACCURACYSPECIFICATION:

There are 14 calibrated spans ranging from 10 kHz per division to 200 MHz per division in a 1, 2, 5 sequence. Frequency error between-anytwopoints on the display is within +. 5 percent of the indicated frequency separa- tion.

DESCRIPTION:

Wide span widths are checked using the 100-, lo-, and 1-MHz outputs of a comb generator. Narrow span widths are checked using the output of a comb generator modulated by a function generator. Since the comb generator produces frequency components separated by a precisely determined frequency interval, the resultant spectral lines displayed on the CRT are evenly spaced when no span error exists in the instrument. Thus, span error is the cumulative variation of distance among the spectral line intervals displayed across the CRT. The amount of span error is determined by comparing the distance of the first nine graticule divisions with the displayed distance of the correspondingspectral line intervals.

SPECTRUM

ANALYZER

FREQUENCY

FUNCT lON

QENERATOR

 

COUNTER

QENERATOR

 

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00 000

 

 

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-0'

 

0::

 

 

 

p 0-

 

O . ooo q

 

 

 

 

 

 

H I G H

 

 

 

UODUL

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BNC TEE

 

FIGURE 4-1. FREQUENCY SPAN ACCURACY TEST SETUP

 

EQUIPMENT:

 

Comb Generator ........................................................HP 8406A
Frequency Counter ..............................................

HP 5342A, Opt. 005

Function Generator ......................................................HP 3310A
BNC Tee ............................................................

HP 1250-0781

Adapter, Type N (m) to BNC (f) (2 required) ...............................

HP 1250-0780