HP 8559A Operation And Service Manual page 38

PERFORMANCE TESTS
Perform the Front Panel Adjustment Procedure in Section Ill before
proceeding with performance tests. Allow at least 30 minutes warmup time.
FREQUENCY SPAN ACCURACY
SPECIFICATION:
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-any twopoints on the display is within
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 corresponding spectral line intervals.
FREQUENCY
COUNTER
EQUIPMENT:
Comb Generator
Frequency Counter
Function Generator
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BNC Tee
Adapter, Type N (m) to BNC (f) (2 required)
PERFORMANCE TESTS
NOTE
FUNCT l ON
QENERATOR
UODUL
BNC TEE
FIGURE 4-1. FREQUENCY SPAN ACCURACY TEST SETUP
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5 percent of the indicated frequency separa-
SPECTRUM
ANALYZER
QENERATOR
MODEL 8559A
HP 8406A
HP 5342A, Opt. 005
HP 33 10A
HP 1250-078 1
HP 1250-0780