HP 8753E Service Manual

Al2 Reference Check
The signals are evaluated with pass/fail checks. The most efficient way to check
the Al2 frequency reference signals is to use the analog bus while referring to
‘Pable 7-2.
Alternatively, you can use an osciuoscope, while referring to ‘Ihble 7-3 and
Figure 7-8 through F’igure 7-14. If any of the observed signals differs from
the figures, there is a 90% probability that the Al2 assembly is faulty. Either
consider the Al2 assembly defective or perform the “A12 Digital Control Signals
Check”.
Both of these procedures are described ahead.
Analog Bus Method
counter.
2. Press L21) IXJ to count the frequency of the 100 kHz signal.
3. Press 1Menu) ~~~~~~~ 1500) m. Verify that the counter reading (displayed
::: :... ii ~........~...i__--.i . . . . . .
on the analyzer next to cnt :) matches the corresponding 100 kHz value for
the CW frequency. (Refer to Table 7-2.)
4. Verify the remaining CW frequencies, comparing the counter reading with
the value in
‘Ihble 7-2:
able 7-2. Analog Bus Check of Reference Frequencies
CW Fre4pency
5ookIiz
2Bm!&
6OBmz
Analog BM Node 21 Analog BUE Node 24
lOOkILt
2ndLO
0.100 MHZ 0.504 MHZ
0.100 MHZ 2.007 Jmz
0.100 MHZ 0.996 MB2
Analog Bus Node 25
0.500 MHZ
2.000 MHZ
1.000 Bmz
the frequencies listed in this table to within 3~0.1%. Accuracy may vary
Source Troubleshooting 7-13

HP 8753E Specifications

General

Brand	HP
Model	8753E
Category	Measuring Instruments
Language	English