HP 8562E - Page 338

Centerfrequency
............................................
..30 0 MHz
Span
...........................................................
. MHz
10. On the’HP 85623 spectrum analyzer, press (SGL-) and (CAL).
II. Simultaneously press I-1 on the HP 8566A/B and ADJ CUR& IF STATE on the
HP 85623 spectrum analyzer. The IF signature is displayed on the HP 8566A/B display.
It may be necessary to experiment with different time intervals between initiating
the sweep on the HP 8566A/B 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 8566A/B controls as follows:
Sweep time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 550ms
dB/division
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 dB
Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 5 dBm
b. Press LF) on the HP 8566A/B
and, a very short time later, press
ADJ Cm IF STATE 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 8566A/B and initiating the current IF state adjustment on the
HP 85623 spectrum analyzer to obtain the waveforms shown. Note the changes in the
HP 8566A/B video bandwidth and sweep time.
13. Reconnect W27 (coax 3) to A5J5.
IF
hP
REF
10 dB/
SAMPLE
CENTER
MKR 5.044 set
.I -,--. -,~ .._.I. _
y 10.0 dBm
ATTEN 20 dB
-42.30 dBm
I
FIG. 6-7
A
I I
f’
I I’
F’IG! 6-6
FIG! 8-6
10.700 000 MHz
SPAN 0 Hz
RES BW 300 kHz
VBW 300 kHz
SWP 5.50 set
Figure 9-3. IF Adjust Signature
IF Section 9-23