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Appendix F: Performance Verification
3. After placing a 5X SMA attenuator on the sampling head input, connect an
SMA cable from the 5X SMA attenuator to the HFS 9000 normal OUTPUT
connector of the channel under test. To save time connecting the cable to
other channels, use the SMA slip-on connector on the end of the cable that
connects to the HFS.
4. Set the DSO to display the signal with 50 mV/div (4 divisions) vertically at
zero offset. Set the DSO time base to 1 s/div horizontally. Set the DSO
MAIN POSITION to minimum.
5. Display the DSO measurement menu and turn on RISE and FALL
measurements. Touch the RISE selector at the bottom of the DSO screen to
display the RISE measurement parameters. Set these parameters according
to Table F–23.
Table F–23: DSO Settings for Rise/Fall Time Checks
DSO Control
Setting
Left Limit
0%
Right Limit
100%
Proximal
20%
Distal
80%
Tracking
On
Level Mode
Relative
6. Once the DSO captures high and low levels, turn off tracking.
7. Set the DSO sweep speed to 500 ps/div and position the first rising edge at
center screen. The measured rise time should be between 420 ps and 1.18 ns
(HFS 9PG2 & HFS 9DG2 cards). (Use waveform averaging to stabilize the
measurement.)
8. Change the Pulse menu Polarity item setting to Complement. The measured
fall time should be between 420 ps and 1.18 ns (HFS 9PG2 & HFS 9DG2
cards).
9. Change the Pulse menu Polarity item setting to Normal. Set the Pulse menu
Transition item to 5 ns.
10. Set the DSO time base to 5 ns/div. Use the RISE measurement to verify that
the rise time is between 4.2 ns and 5.8 ns (HFS 9PG2 & HFS 9DG2 cards).
11. Change the Pulse menu Polarity item setting to Complement. The measured
fall time on the DSO should be between 4.2 ns and 5.8 ns (HFS 9PG2 &
HFS 9DG2 cards).
F–26
HFS 9000 User Manual