To Adjust The High-Frequency Pulse Response - HP 54616B User And Service Manual

To adjust the high-frequency pulse response

In this procedure you adjust the high-frequency pulse response for each
channel to a nominal setting for optimum performance over all sensitivity
settings.
Table 4-11 Equipment Required
Equipment
Pulse generator
Cable
Press
1
oscilloscope and pulse generator as indicated below.
Pulse Generator
Delay
Duty Cycle
Width
High
Low
Connect the pulse generator output to the Channel 1 input of the
2
oscilloscope , then enable the pulse generator output.
Press
3
Press
4
softkey.
Adjust the V1 cursor to the bottom-base of the waveform and adjust
5
the V2 cursor to the top-base of the waveform.
Record the ∆V(1) value as V
6
Adjust the V1 cursor to the peak of the first excursion above the V2
7
cursor.
This is the overshoot of the input pulse which is used to optimize the
frequency response of the channel.
Record the ∆V(1) value as V
8
Calculate % overshoot = (V
9
Critical specifications
Rise time ≤ 700 ps
50Ω BNC (m-m)
, press the Default Setup
Setup
0 ps
50%
50 ns
0.3 V
0.0 V
.
Autoscale
, then press the appropriate
Cursors
base
overshoot
overshoot
Adjusting the Oscilloscope
Recommended Model/Part
HP 8131A
HP 10503A
softkey, then set the
Oscilloscope Channel 1 and Channel 2
Input 50Ω
Volts/Div 50 mV
Display Vectors Off
Display Grid None
or
V1 V2 Active Cursor
= ____________
= ____________
/ V ) X 100 _____________
base
Service
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