HP 3720A - 4-21 FLOW D - Other Transferred Signals Faults

Model 3720A
4-21 FLOW D - Other Transferred Signals Faults
4-22 Faults in this category subdivide into three groups, each with its own Flow. However, the same general
troubleshooting procedure applies to locating faults in all
of these groups.
Repeat check. Moni-
Monitor 3720A J3 pins tor 3721A J18 pins
(as appropriate) with
(as appropriate)
Logic Probe. Is Logic with Logic Probe.
Probe condition correct?
Is Logic Probe
condition correct?
IIII)c 3721A
1
3720A 15549-70002 Cable
4-23 FLOW D(a) - Timescale Transfer Faults
4-24 Procedure
1. Set controls as in Paragraph 4-12 except as follows:
Set 3721A controls:
FUNCTION
.. .. .. .. CROSSCORRELATION -
A DELAYED
.. ._ EXPONENTIAL x 1
.. .. .. .. see Table 4-6
AVERAGING
..
TIMESCALE ..
Set 3721A TIME-
SCALE switch
according to Table 4-6.
Monitor 3720A J3
pins 20, 21, 22, 23, 24
and 45 with Logic
Probe?
Is Logic Probe
condition correct?
3720A
4-8
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Repeat check. Moni-
tor 3721A J18 pins 20,21
22,23,24 and 45
with Logic Probe?
- 3721A
Is Logic Probe
condition correct?
15549-70002 Cable
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L
4
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