Tektronix P6205, Instruction Manual

Page: 55 / 74

Performance Verification
P6205 Instruction Manual
4–13
NOTE
. If the waveform front corner appears rounded or rolled-off, set
the left-limit measurement cursor at the first 100% amplitude point
of the waveform. Refer to Figure 4–9 above.
15. The probe aberrations are approximately the difference between
the measured probe aberrations and the oscilloscope system
aberrations. Subtract the system aberrations (Step 6) from the
measured aberrations (Step 14) for both the peak and the
peak-to-peak aberrations.
abs
p
+
abs
p
)
s
– abs
s
NOTE
. In some cases the measured aberrations are less than the
system aberrations. This situation occurs when the slower rise time
of the probe (compared to the oscilloscope/sampling head combina-
tion) filters out a portion of the higher-frequency aberrations.
16. Verify that the probe-only aberrations meet specifications:
peak, first 20 ns
±
7%
peak to peak, first 20 ns 10%
17. Repeat steps 1 through 15 above using an oscilloscope sweep
speed of 500 ns per division. Adjust the oscilloscope as necessary
to display one pulse step and at least 2
m
s of settling time.
Optional: Increasing the number of waveforms averaged will
reduce the effects of noise on the smaller aberrations in the latter
part of the signal.
18. Verify that the probe-only aberrations meet specifications:
peak, 20 ns to 2
m
s
±
3%
peak to peak, 20 ns to 2
m
s 5%