Width Adjustment; Equipment - HP 8112A Operating, Programming And Servicing Manual

Width Adjustment

Equipment

P r o c e d u r e 1.
Note
Counter (HP5335A)
n
Oscilloscope (HP 54121T)
n
Set up the HP 8112A as follows:
Trigger Mode
Control Mode
PER
DEL
WID
Transition
HIL
COMPL
DISABLE
LIMIT
Set the counter to TIME Interval A--+B, COM, A I, B 1, Trig
2.
level 1.50 V, Z = 50R
The typical Width range characteristic is shown in Figure 9-4.
3 .
Connect the HP 8112A main output to channel A of the counter.
4.
Adjust the range high end with A2R9 for about 1% above
5 .
programmed value (1.01 ms).
Set the HP 8112A WID parameter to 9.99 ms.
6 .
Adjust the range low end with AlRll for about 1% above
7 .
programmed value (10.1 ms).
Set the HP 8112A WID parameter to 3.5 ms.
8 .
Check the mid range for 3.5 ms 650 pus.
9 .
Repeat steps 5 to 9, adjusting again if necessary for the best
10.
compromise.
If the adjustment is not possible, alter the value of A2VR3/R63
table 9-l). Repeat steps 5 to 9 if neccessary.
11. Set the HP 8112A as follows:
PER
WID
12. Connect HP 8112A Trigger Output via a 20 dB attenuator, to
trigger input of the HP 541218.
13. Connect HP 8112A Output via a 20 dB attenuator to input 4 of
the HP 541218.
NORM
Off
20 ms
65 ns
1 ms
Fixed
0.0 v
Off
Off
Off
200 ns
10 ns
Adjustment Procedures 9-13
(see