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Basic Applications -- 2221 Operators
C
li
AT =0.525mis
SAVE REF
WAVEFORM
AV2.08V
100
100
90
90 .
t
+ + + + + + +
ACTIVE
CURSOR
ON
SECOND
PULSE
50 % LEVEL
N
CURSOR
ON FIRST
PULSE 50 %
LEVEL
-
C
PULSES CENTERED
VERTICALLY
10
COMPARISON
WAVEFORM
21
Di 1ms
Com
4998-19
4998-20
Figure 6-17. Waveform comparison.
Figure 6-18. Time difference between repetitive pulses.
NOTE
TIME DIFFERENCE BETWEEN
REPETITIVE PULSES
Pulses with fast rise times have only
few sample
points on the leading edge, and it may not be possi
ble to place the cursor dot at exactly the 50 % level.
1. Preset instrument controls and obtain a baseline
trace .
9. Read the time difference between puises from the
crt readout.
2. Set the STORE /NON - STORE switch to the STORE
position ( button in ).
1
UU
3. Select a VOLTS/ DIV switch setting that gives about
five divisions of display amplitude .
TIME DIFFERENCE BETWEEN
TWO TIME -RELATED PULSES
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1. Set the VERTICAL MODE switches to BOTH and
ALT.
4. Use the selected channel Vertical POSITION control
to center the display .
UU
5. Set the SEC/ DIV switch to display the points of
interest between which the measurement is to be made .
2. Use probes or coaxial cables with equal time delay
to apply the pulse signals to be measured to the input
connectors ; one to Channel 1 and the second to Chan
nel 2 .
6. Push the SAVE / CONT button to activate SAVE
mode to hold the acquired waveform and to provide a
more stable display for measurement.
3. Set the VOLTS/ DIV switches to obtain about three
divisions of display amplitude for each signal .
UU
U외
7. Use the CURSORS control to move the active cur
sor to the 50% level on the leading edge of the first pulse.
4. Set the STORE /NON -STORE Switch to STORE
( button in ) , set the TRIGGER Mode switch to NORM , set
the SOURCE switch to INT , and set the INT switch to
CH 1 .
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8. 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 6-18 ).
5. Adjust the TRIGGER LEVEL and SLOPE control for
a continuous, triggered acquisition of the signals.
C
C
6-18
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