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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.
4-1
1.
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
+.
5
percent of the indicated frequency separa
-
tion.
DESCRIPTION:
FIGURE
4-1.
FREQUENCY SPAN ACCURACY TEST SETUP
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.
SPECTRUM
ANALYZER
FUNCT
l
ON
QENERATOR
FREQUENCY
COUNTER QENERATOR
/
\
EQUIPMENT:
-0'
000 000
-
0
0
000
p
0
........................................................
Comb Generator HP 8406A
..............................................
Frequency Counter
HP
5342A, Opt. 005
......................................................
Function Generator HP 33 10A
............................................................
BNC Tee HP 1250
-
078 1
...............................
Adapter, Type N (m) to BNC
(f)
(2 required)
HP 1250
-
0780
0:
:
O
.oooq
HIGH
UODUL
i
------
BNC TEE