Agilent Technologies 856290216 service manual If Adjust Signature If Section

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.

I F									M K R 5 . 0 4 4	set
REFy 10.0 dBm	ATTEN	2 0 dB		- 4 2 . 3 0						dBm
hP						I
1 0 dB/					F I G . 6 - 7
							A
SAMPLE	I	I	f’					I	I ’

F’IG! 6-6

F I G ! 8-6

CENTER 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 kHz	V B W 3 0 0 kHz	S W P 5 . 5 0 set

Figure 9-3. IF Adjust Signature

IF Section 9-23