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Trigger point
Trigger
point
Trigger
point
Fig. 11
Trigger
point
Input signal changed
into a pulse waveform.
Readjust level
(a) When the trigger level is set
around the center of the waveform.
Trigger point
S w e e p stops with no trigger.
S a m e level as (1)
Highest level
(b) When the trigger level is set to
the " - " side of the waveform
(Mode switch set to " N O R M " )
(4)
(c) Mode s w i t c h set to " F I X " .
Fig. 12
1 8
" N O R M '
" F I X '
L E V E L control
Triggering without
setting level
5. Adjust the A S W E E P / T I M E DIV control @ to obtain an
appropriate display. Now a normal s w e e p display is ob-
tained.
(2) M A G N I F I E D S W E E P O P E R A T I O N
Since merely shortening the s w e e p time to magnify a por-
tion of an observed w a v e f o r m can result in the desired por-
tion disappearing off the screen, s u c h magnified display
should be performed using the M A G N I F I E D S W E E P .
Using the ^ • POSITION ® control, adjust the desired por-
tion of waveform to the C R T . Pull the P U L L x 1 0 M A G ®
control to magnify the display 10 times. For this type of dis-
play the s w e e p time is the S W E E P T I M E / D I V setting divid-
ed by 10.
(3) A L T E R N A T E S W E E P O P E R A T I O N
A s w e e p and B delayed s w e e p are usable in an alternating
fashion making it possible to observe both the normal and
magnified waveform simultaneously.
Procedure:
1 . Set the HORIZ MODE to A and adjust for a normal w a v e -
form display.
2. Depress the HOLD O F F control (26) ( A F T E R D E L A Y ) and
set the HORIZ MODE to A L T . Adjust T R A C E S E P A T A -
TION (27) for easy observation of both the A and B traces.
The upper trace is the non-magnified portion of the wave-
form with the magnified portion super-imposed a s an
intensified section. T h e lower w a v e f o r m is the intensi-
fied portion displayed magnified.
3 . T h e z l R E F / D E L A Y TIME POSITION (35) control can be used
to continuously slide the magnified portion of the w a v e -
form across the A s w e e p period to allow magnification
of precisely the desired portion of w a v e f o r m .
4 . Set the HORIZ MODE to B to display the INT intensified
portion as a magnified B s w e e p . (Fig. 14)
5. For Starts A F T E R D E L A Y operation, apparent jitter in-
creases as magnification increases. T o obtain a jitter free
display pull the HOLD O F F control out. In this "Trigger-
able After D e l a y " mode the A trigger signal selected by
the S O U R C E s w i t c h © becomes the B trigger source.
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