Kenwood CS-1045, Instruction Manual

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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 ® con-
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 @ to TRIG. In this
"Triggerable After Delay" mode the A trigger signal
selected by the SOURCE switch (fj) becomes the B trig-
ger source.
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 C R T 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 C H 2
VOLTS/DIV and VARIABLE controls.
4. The C H 2 (vertical) POSITION
(Q}>
control now serves as
the horizontal position control, and the POSITION
control is disabled.
5. All sync controls are disconnected and have no effect.
B Sweep
A Sweep
Intensified zone to be magnified
A Sweep
. Intensified zone to be magnified
B Sweep
Fig. 12
Fig. 14
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