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5500A
Service Manual
6-154. Adjusting the Rise Time for the Edge Function
This procedure adjusts the edge rise time, and must be performed after repair. Both
boards use the same procedure to adjust the rise time.
6-155. Equipment Setup
Before you start this procedure, program the Calibrator Mainframe to output 250 mV p-
p @ 100 kHz. Program the digital storage oscilloscope to the parameters listed below.
Digital Storage Oscilloscope Setup
Vertical Axis:
Horizontal Axis: 1 ns/div
Function:
6-156. Adjusting the Edge Rise Time
Only one adjustment needs to be made to the edge rise time. You want a rise time of
950 ps ± 25 ps. To achieve this rise time, adjust C1 until this rise time on the
oscilloscope is within this range as shown in Figure 6-38.
Rise time
measures
between
these two
points
6-122
50 mV/div
Rise Time
90%
10%
Figure 6-38. Adjusting the Edge Rise Time with C1
C1
om044f.eps
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