Tektronix P6015A, Instruction Manual

Page: 58 / 76

Adjustments
2–10
P6015A Instruction Manual
Bandwidth and Rise Time Verification
The following check is part of the performance verification
procedure. You may omit it if you are performing the adjustment
procedure.
1. Substitute the sine wave generator for the calibration generator.
2. Set the oscilloscope vertical deflection to 1 mV/div (1 V/div
when using the readout option), and set the time base to display
10
m
s/div.
3. Set the generator frequency to 50 kHz, and set the amplitude to
display five divisions peak-to-peak.
4. Increase the generator frequency to:
H
75 MHz for a 10 ft. (3 m) cable.
H
25 MHz for a 25 ft. (7 m) cable.
while observing the oscilloscope display. Set the generator
frequency to the point of lowest amplitude at or below
75 MHz (10 ft. cable) or 25 MHz (25 ft. cable).
5. The amplitude of the waveform should be at least 3.5 divisions
(0.707 of the amplitude in Step 3).
This procedure does not check rise time directly, but it can be
approximated by the ratio t
r
= 0.35 / bandwidth.