High Frequency Pulse Response Adjustment Setup - HP 75000 C Series Service Manual

FAST-RISE
PULSE GENERATOR
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D C U b m
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PROTECTED
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UNPROTECTED
TOP VIEW
Figure
5-5.
Hlgh Frequency Pulse Response Adjustment Setup
5. Set the Oscilloscope controls (on the channel being adjusted)
as follows:
Time Base Range
to
5 nsec
...........................
T1M:RANG 5E-9
Time Base Delay to -1.4 nsec
.....................
T1M:DEL -1.4E-9
Digitize the channel being adjusted
...............
DIG CHAN<n>
Measure VMAX
...................
MEAS:SOUR CHAN<n>;VMAX?
Verify measured result is 5100
If
VMAX
measured result is >loo, an invalid
measurement has occurred. Find the cause and correct
before continuing.
If correct, proceed with step 6.
6. Calculate overshoot (VMAX-VTOP)/(VTOP-VBASe)* 100,
Verify calculated overshoot results are 3% f0.596.
If correct, proceed with step 7.
If incorrect, adjust the applicable resistor (A2R501 through
R504, depending on the channel being adjusted) and repeat
the procedure.
7. Disconnect test equipment and set the CAL FACTOR
PROTECT switch to
PROTECTED.
February
9, 1991
Adjustments
5-1 1