HP 8562E, Service Manual

Page: 338 / 482

Centerfrequency
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..30 0 MHz
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. MHz
10. On 85623 spectrum analyzer, press and (CAL).
Simultaneously press on the HP and ADJ IF STATE on the
HP 85623 spectrum analyzer. The IF signature is displayed on the HP display.
It may be necessary to experiment with different time intervals between initiating
the sweep on the HP
and initiating the current IF state adjustment on the
HP 85623 spectrum analyzer.
12. Compare the IF signature to the signature of a properly operating spectrum analyzer
illustrated in Figure 9-3. If the signatures do not closely resemble each other, a more
detailed view of the signature may show the failed hardware.
a. Set the HP controls as follows:
Sweep time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 550ms
dB/division . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
b. Press on the HP
and, a very short time later, press
IF on HP 85623 spectrum analyzer. Figure 9-4 through Figure 9-8
illustrate detailed IF signatures of a properly operating HP 85623 spectrum analyzer.
It may be necessary to experiment with different time intervals between initiating the
sweep on the HP
and initiating the current IF state adjustment on the
HP 85623 spectrum analyzer to obtain the waveforms shown. Note the changes in the
HP
video bandwidth and sweep time.
13. Reconnect W27 (coax 3) to
I F
REF
1 0
SAMPLE
CENTER
M K R 5 . 0 4 4
10.0 2 0
- 4 2 . 3 0
I
F I G . 6 - 7
I I I I ’
F’IG! 6-6 F I G !
1 0 . 7 0 0 0 0 0 M H z
S P A N 0 H z
R E S B W 3 0 0 V B W 3 0 0
S W P 5 . 5 0
Figure 9-3. IF Adjust Signature
IF Section 9-23