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(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 sweep time to magnify a por-
tion of an observed waveform can result in the desired por-
tion disappearing off the screen, such magnified display
should be performed using the MAGNIFIED SWEEP.
Using the
POSITION control, adjust the desired portion
of waveform to the C R T . Pull the P U L L x 10 MAG ®
trol to magnify the display 10 times. For this type of
display the sweep time is the SWEEP TIME/DIV setting
divided by 10.
(3) A L T E R N A T I N G S W E E P O P E R A T I O N
A sweep and B delayed sweep 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
waveform display.
2. Set the B TRIG MODE to AFTER DELAY and set the
HORIZ MODE to A L T . Adjust T R A C E SEPATATION @
for easy observation of both the A and B traces. The up-
per trace is the non-magnified portion of the waveform
with the magnified portion super-imposed as an inten-
sified section. The lower waveform is the intensified
portion displayed magnified.
3. The DELAY TIME MULT can be used to continuously
slide the magnified portion of the waveform across the
A sweep period to allow magnification of precisely the
desired portion of waveform. To magnify the front part
of the sweep, set B TRIG MODE @ to DELAY = 0.
4. Set the HORIZ MODE to B to display the INT intensified
portion as a magnified B sweep. (Fig. 13)
Delay Time (magnified portion) = DELAY TIME MULT
setting x A S W E E P TIME/DIV setting.
5. For Starts AFTER DELAY operation, apparent jitter in-
creases as magnification increases. To obtain a jitter
free display set the B TRIG MODE @
"Triggerable After Delay" mode the A trigger signal
selected by the SOURCE switch (fj) becomes the B trig-
ger source.
A S w e e p
con-
to TRIG. In this
Intensified zone to be magnified
Fig. 12
B S w e e p
Fig. 13 Magnified view of intensified zone above
Note that for this type of operation both the DELAY TIME
MULT and TRIG LEVEL affect the start of the B sweep so
that the delay time is used as a reference point. (Fig. 14)
(4) X - Y O P E R A T I O N
For some measurements, an external horizontal deflection
signal is required. This is also referred to as an X - Y
measurement, where the Y input provides vertical deflec-
tion and X input provides horizontal deflection.
X-Y
operation permits the oscilloscope to perform many
types of measurements not possible with conventional
sweep operation. The CRT display becomes an electronic
graph of two instantaneous voltages. The display may be a
direct comparison of two voltages such as during phase
measurement, or frequency measurement with Lissajous
waveforms.
To use an external horizontal input, use the following pro-
cedure;
1. Set the HORIZ MODE switch to X - Y the position.
2. Use the channel 1 probe for the vertical input and the
channel 2 probe for the horizontal input.
3. Adjust the amount of horizontal deflection with the CH2
VOLTS/DIV and VARIABLE controls.
4. The CH2 (vertical) POSITION (Q}> control now serves as
the horizontal position control, and the
control is disabled.
5. All sync controls are disconnected and have no effect.
A S w e e p
B S w e e p
POSITION
. Intensified zone t o be magnified
Fig. 14
1 7
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