Timing
Equipment
•
Counter (HP 5335A)
Procedure
•
Oscilloscope (HP 52141 T)
Period
1 . Set up the HP 8 1 12A as follows:
Trigger Mode
NORM
Control Mode
Off
PER
1 ms
DEL
65 ns
DTY
503
Transition
Fixed
HIL
+3.0
v
LOL
0.0
v
COMPL
Off
DISABLE
Off
LIMIT
Off
2. Set the counter for Period measurement.
3. Connect HP 8 1 12A 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
PERIOD
Figure 9-4. Decade Accuracy
5. Adjust the range
high
end with A2R4 for approx 13 above the
programmed value (i.e. l .Olms).
6. Alter HP 8 1 12A PER to 9.99 ms.
7. Adjust the range
low
end with A2R6 for approx 13 above the
programmed value (i.e. 10. lms).
8. Alter HP 8 1 12A 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.
9-10 Adjustment Procedures
Summary of Contents for 8112A
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