HP 3562A Service Manual page 485

MOD E L 3S62A
G. Oscilloscope Signal Waveforms
The osc i l loscope p l ots are u sed for tro u b l eshooting the A2 C PU/H P I B. N ote that a l l the
me asu reme nts are taken with a 1 0:1 probe. Other notes u n ique to a measurement are
written next to the waveform.
Remove Power
J um pers in normal (N) position: A l l j u m pers
Connect ground to A2 TP1
Probe: 1 0:1
Power On
Setup
H
MHz Clock
Connect CH1 to A2 TP5
Oscil loscope:
Bandwidth L i m it: ON
Mode
CH1 V/Diy
CH1 Cou p l i ng
Time/Div
Trigger
Press A2 S1 switch to see the waveform #2. DT ACKL and ASL w i l l stop changing for a short time
DTAC K l, ASl
Connect CH1 to A2 U1 00-1 0
Connect C H 2 to A2 U1 00-6
Oscil loscope:
Bandwidth L i m it: ON
Mode
CH1 V/Diy
C H 2 V/Diy
CH1 Cou p l i ng
C H 2 Cou pl ing
Ti me/Div
Trigger
Table A2-S CPU Signal Waveforms
Important
Parameters
Time
Pulse shape
A
50
mV/Div
d c
50 ns/D iv
CH1
Time
rel ationship
A & B
1 00
mV/Div
1 00
mV/Div
d c
dc
200
ns/D iv
CH1
Waveform
C H I C P L G = D C
C H 1 = 5 121 m V / D l v
OVdc
M T C H I
M a l n = 5 121 n s / 0 1 V
#1
C H I C P L G � D C C H 2
C H 1 = 1 0 0 m V / D l v C H 2 =
OVdc
OVdc
M T - C H i
M a l n = 2 121 121 n s / D l v
#2
S E RV I C E
( =
2s).
C P L G = D C
1 121 121 m V / O i v
8-35