Equipment - HP 8112A Operating, Programming And Servicing Manual

Width Adjustment
Equ ipm en t
Procedure
Note
•
Cou nter (HP 5335 A )
•
Oscilloscope (HP 541 2 1 T)
1 . Set up the HP 8 1 1 2A as follows:
Trigger Mode
Control Mode
PER
DEL
WID
Transition
HIL
LOL
COMPL
DISABLE
LIMIT
2. Set the counter to TIME Interval A-+B, COM, A z
v,
=
level 1 .50
3. The typical Width range characteristic is shown in Figure 9-4.
4. Connect the HP 8 1 1 2A main output to channel A of the counter.
5. Adjust the range high end with A2R9 for about 1 % above
programmed value ( 1 .0 1 ms).
6. Set the HP 8 1 12A WID parameter to 9.99 ms.
7. Adjust the range low end with AlRl l for about 1% above
programmed value ( 1 0 . 1 ms).
8. Set the HP 8 1 12A WID parameter to 3.5 ms.
9. Check the mid range for 3.5 ms ±50 µs .
5
10. Repeat steps to 9, adjusting again if necessary for the best
compromise.
If the adjustment is not possible, alter the value of A2VR3/R63 (see
table 9- 1 ) . Repeat steps 5 to 9 if neccessary.
1 1 . Set the HP 8 1 1 2A as follows:
PER
WID
12. Connect HP 8 1 12A Trigger Output via a 20 dB attenuator, to
trigger input of the HP 54121A.
13. Connect HP 8 1 1 2A Output via a 20 dB attenuator to input 4 of
the HP 54121A.
NORM
Off
20 ms
65 ns
1 ms
Fixed v
v
+3.0
0.0
Off
Off
Off
son
200 ns
10 ns
Adjustment Procedures 9-13
f ,
B \ , Trig