Preshoot - HP 8114A Service Manual

1) Overshoot and Ringing
Note

2) Preshoot

3.42 Testing the HP 8114A
3. Set the digitizing oscilloscope HP 54121T:
Press (KKZZiK)
n
Select the Display menu and set, the Number of Averages to 32
n
Select the Channel menu and set the Attenuation factor to 100
n
Center one pulse horizontally and vertically on screen (e.g.
n
]
LEVEL SET
Select the channel menu and center vertically the top pulse
n
(offset = 25 V)
Set the VOLTSDIV = 1 V/div
n
Select the Timebase menu and set TIMEiDIV = 20 ns/div,
n
DELAY = 30 ns
4. Check that Overshoot and Ringing are within the f5% of
amplitude lt50 mV window (within the two marker positions)
5. Enter the result in the Test Report as TR entry 9 I
lake the oscilloscope's trace flatness error (GaAs input circuit) into
account.
6. Set HP 8114A to: Amplitude = 5 V
7. Repeat steps 3 to 5, but this time set the Scope to:
OFFSET = 5 V
n
8. Enter the result in the Test Report as TR entry 9 - 2
9. Set HP 8114A to:
Period = 1 ps
l
Amplitude = 5 V,
l
Baseline = 0 V
Delay = 50 ns
n
10. Set the digitizing oscilloscope, HP 54121T:
Press (iii]
l
Select the Display menu and set the Number of Averages to 32
l
Select the Channel menu and set the Attenuation factor to 100
l
Center one pulse horizontally and vertically on screen (e.g.
n
Select the delta V menu and turn
n
Set the
VARIABLE LEVELS = -6% to +6% and press
n
( )
A U T O L E V E L S E T
Select the channel menu
n
pulse (offset = 0 V)
Set the VOLTSDIV = 200 mV/div
n
[
AUTO LEVEL SET
the
voltage markers On
and
center vertically the bottom of the
On
]