
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 Critical specifications Recommended Model/Part
Pulse generator Rise time ≤ 700 ps Agilent 8131A
Cable 50Ω BNC (m-m) Agilent 10503A
1 Press Setup , press the Default Setup softkey, then set the
oscilloscope and pulse generator as indicated below.
Pulse Generator Oscilloscope Channel 1 and Channel 2
Delay 0 ps Input 50Ω
Duty Cycle 50% Volts/Div 50 mV
Width 50 ns Display Vectors Off
High 0.3 V Display Grid None
Low 0.0 V
2 Connect the pulse generator output to the Channel 1 input of the
oscilloscope , then enable the pulse generator output.
3 Press Autoscale .
4 Press Cursors , then press the appropriate V1 or V2 Active Cursor
softkey.
5 Adjust the V1 cursor to the bottom-base of the waveform and adjust
the V2 cursor to the top-base of the waveform.
6
Record the ∆V(1) value as V
base
= ____________
7 Adjust the V1 cursor to the peak of the first excursion above the V2
cursor.
This is the overshoot of the input pulse which is used to optimize the
frequency response of the channel.
8
Record the ∆V(1) value as V
overshoot
= ____________
9 Calculate % overshoot = (V
overshoot
/ V
base
) X 100 _____________
Service
Adjusting the Oscilloscope
4–27
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