15. F O C U S
Spot focus control to obtain optimum waveform
according to brightness.
16. EXT T R I G
External trigger terminal. For external triggering,
set S O U R C E (17) to E X T and apply external
triggering voltage.
17.
S O U R C E
Five-position lever switch selects triggering source
for sweep.
I N T : In CH 2 mode, Channel 2 signal becomes
trigger. In CH 1 , A L T , CHOP, and A D D
mode, Channel 1 signal becomes trigger.
C H 1 : Channel 1 signal becomes trigger in ail
modes.
C H 2 : Channel 2 signal becomes trigger in all
modes.
L I N E : Line voltage becomes trigger.
E X T : Signal applied at EXT T R I G jack becomes
trigger.
18. S Y N C
Four-position lever switch with the following
positions:
S L O P E : The S L O P E positions are used for viewing
all waveforms except television composite
video signals.
(-+-): S w e e p is triggered on positive-
going slope of waveform.
( — ) : S w e e p is triggered on negative-
going slope of waveform.
S Y N C S W I T C H
V I D E O ( + )
V I D E O ( —)
V I D E O :
In the V I D E O positions, the sync pulses of
a composite video signal are used to
trigger the s w e e p ; the vertical sync pulses
(frame) are automatically selected for
sweep times of 0.5 s/div to 0.1 ms/div,
and horizontal sync pulses (line) are
automatically selected for sweep times of
5 0 /xs/div to 0.5 /ns/div.
( + ): S w e e p is triggered on positive-
going sync pulse.
( — ) : S w e e p is triggered on negative-
going sync pulse.
19. L E V E L , P U L L A U T O
Sync level adjustment determines points on
waveform slope where sweep starts; ( — ) equals
most negative point of triggering and ( + ) equals
most positive point of triggering.
P U L L A U T O :
Push-pull switch selects automatic triggering when
pulled out ( P U L L A U T O ) . When automatic trigger-
ing, a sweep is generated even without an input
signal.
20. ««• POSITION, PULL X10 MAG
Rotation adjusts horizontal position of traces (both
traces when operated in the dual trace mode).
P U L L
X 1 0
M A G :
Push-pull switch selects X 1 0 magnification when
pulled out ( P U L L X 1 0 M A G ) ; normal when pushed
in.
2 1 . S W E E P T I M E / D I V
Horizontal coarse sweep time selector. Selects
calibrated sweep times of 0.5 ^ s / d i v (microsecond
per division) to 0.5 s/div in 19 steps when
V A R I A B L E control (22) is set to the C A L position
(fully clockwise). In the X - Y position, this switch
disables the internal sweep generator and permits
the CH 2 input to provide horizontal deflection ( X - Y
operation). The Channel 1 input signal produces
vertical deflection (Y axis) and the Channel 2 input
signal produces horizontal deflection (X axis).
22. V A R I A B L E
Fine sweep time adjustment. In the extreme
clockwise ( C A L ) position the sweep time is
calibrated.
23. C A L 1 kHz, 0.1 Vp-p
Provides calibrated 1 kHz, 0.1 volt peak-to-peak
square wave input signal. This is used for calibra-
tion of the vertical amplifier attenuators and to
check the frequency compensation adjustment of
the probes used with the oscilloscope.
7
Fig. 3
