Optocoupler; Amplifier Dacs - HP 8114A Service Manual

Optocoupler

Amplifier DACs

5.18 Troubleshooting
Check for a signal output at TP201, TP203, TP204, and TP205 while
varying the output amplitude. In the state of rest (not varying the
output amplitude) there is +5 VFL present.
The specified output amplitude range is internally divided into 6
ranges. Eighteen hybrids are necessary to cover the amplitude range.
There are four hybrid groups, each controlled by a DAC. Different
hybrid groups are active or switched off
Following table shows in which amplitude range which output voltage
is
present at, which DAC:
4.99 v
5.00 v
7.99 v
8.00 v
15.99 v
16.00 V
29.99 v
30.00 v
50.05 v
in
the 6 amplitude ranges.
0.0 v 0.0 v
0.0 v 0.0 v 0.71 v
0.0 v 0.0 v
0.0 v 0.57 v
0.0 v 1.12 v
0.62 V 0.0 v 0.62 V
1.15 v
0.0 v
0.71 v 0.71 V 0.71 v
1.17 v
1.17 v
1.06 V
0.0 v
0.71 v
1.12 v 1.13 v
0.0 v 0.0 v
0.0 v 0.0 v
0.0 v
1.15 v 0.0 v
0.71 v
1.18 v 1.18 V