Timing - HP 8112A Operating, Programming And Servicing Manual

Timing

Equipment
Procedure
9-10 Adjustment Procedures
•
Counter (HP 5335A)
•
Oscilloscope (HP 52141 T)
Period
1 . Set up the HP 8 1 1 2A as follows:
Trigger Mode
Control Mode
PER
DEL
DTY
Transition
HIL
LOL
COMPL
DISABLE
LIMIT
2. Set the counter for Period measurement .
3. Connect HP 8 1 1 2A output via a 50!1 feedthrough to the counter.
4. The typical period accuracy of the period decades is as shown in
Figure 9-4.
+ 2%
E R ROR
Figure 9-4. Decade Accuracy
5. Adjust the range high end with A2R4 for approx 1 3 above the
programmed value (i.e. l .Olms).
6. Alter HP 8 1 1 2A PER to 9.99 ms.
7. Adjust the range low end with A2R6 for approx 1 3 above the
programmed value (i.e. 10. lms).
8. Alter HP 8 1 1 2A PER to 5.0 ms.
9. Check that the mid-range deviation is about the same as the
low /high range BUT negative. See Figure 9-4.
NORM
Off
1 ms
65 ns
503
Fixed
v
+3.0
v
0.0
Off
Off
Off
P E R I O D