--
IOO
•
I
90--t---tl-~~.-t-----t--i-----------t--t---------J"t----t
f----+--+---t--+--+---t--t--+-COMPARISON
WAVEFORM
4998-19
Figure 6-6. Waveform comparison.
9. The acquisition waveform display may
be
positioned
horizontally for comparison with the reference signal by
using the following procedure:
a.
Use the B TRIGGER LEVEL control to set the B
TRIGGER Source to Starts After Delay.
b.
Set the HORIZONTAL MODE switch to
B.
c.
Leave the A and the B SEC/DIV knobs locked
together and use the B DELAY TIME POSITION
control to move the acquisition waveform display
horizontally.
Time Difference Between Repetitive Pulses
1 . Preset instrument controls and obtain a baseline
trace.
2.
Set the STORE/NON STORE switch to the STORE
position (button
in).
3.
Select a VOL TS/DIV switch setting that gives about
5 divisions of display amplitude.
4.
Use the selected channel Vertical POSITION control
to center the display.
Basic Applications-2230 Operators
5.
Set the A SEC/DIV switch to display the points of
interest between which the measurement
is
to
be
made.
6.
Set the SAVE/CONTINUE switch to the SAVE posi-
tion (button
in)
to hold the acquired waveform and to pro-
vide a more stable display for measurement.
7. Set the POSITION CURS/SELECT WAVEFORM
switch to the POSITION CURS position (button
in).
8.
Use the CURSORS control to move the active cur-
sor to the 50% level on the leading edge
of
the first pulse.
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100
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RSOR
FIRST
cu
ON
PULS
LE
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VEL
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i
I
~
i
10
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RV
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l'-.1/
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b.l
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-
PULSES CENTERED
VERTICALLY
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ACTI
VE
OR
CURS
ON
SECO
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ND
E
VEL
,......so%
LE
4998-20
Figure 6-7. Time
difference
between repetitive pulses.
9. Push the SELECT C1/C2 button to select the other
cursor and use the CURSORS control to move the active
cursor to the 50% level on the leading edge of the second
pulse (see Figure 6-7).
NOTE
Pulses with fast rise times have only a few sample
points
on
the leading edge, and
it
may
not
be
possi-
ble to place the cursor dot
at
exactly the 50%
level.
10. Read the time difference between pulses from the
crt readout.
6-9
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