C O N T R O L S ON P A N E L S
25. SOURCE
Sync source voltage selector switch for three functions,
INT (internal sync), LINE ( 5 0 / 6 0 Hz sync) and E X T (exter-
nal sync).
INT: S w e e p is triggered by vertical input signal.
LINE: S w e e p is triggered by 5 0 / 6 0 Hz power fre-
quency.
E X T : S w e e p is triggered by voltage applied to
E X T T R I G terminal and D C component.
26. SLOPE
S y n c polarity selector s w i t c h . In the " + " position,
s w e e p is triggered with rising slope of input w a v e f o r m ,
and in t h e " — " position, with falling slope of input
w a v e f o r m .
27. LEVEL, PULL AUTO
Triggering level control adjusts s y n c phase to deter-
mine the starting point of s w e e p on the slope of trigger
signal w a v e f o r m . B y pulling the knob toward y o u , auto
s w e e p is effected; the s w e e p is set in free-run state
and the trace is displayed on C R T even when no trigger
signal is present. W h e n trigger signal is present, s w e e p
is started so the triggering level can be adjusted.
28. TRIG'D
S y n c indication lamp lights w h e n s y n c signal is trig-
gered. Check this lamp lights w h e n writing input singal
to memory.
T h e lamp may light in the GND position of the A C -
G N D - D C ( 1 3 ) . T h i s is normal and is not an indication
that the unit is defective.
29. EXT TRIG
Input terminal for external trigger signal. External trig-
ger signal (1 Vp-p or higher) should be applied with
S O U R C E s w i t c h set to E X T .
30. HOR INPUT
Input terminal for external horizontal signal. D I S P L A Y
MODE s w i t c h should be set to X - Y .
3 1 . DISPLAY TIME
Store and read-out operation are automatically
repeated w h e n this knob is pulled out (free run
fuction). T h e display time is about 1 second w h e n the
knob is fully set to the left and about 2 0 seconds w h e n
it is fully set to the right. T h i s function is effective only
w h e n the D I S P L A Y mode is R E A L .
32. PEN SPEED
Selects the memory read speed in the PEN mode from
among three speeds: 10 to 5 0 ms/word. This switch
functions regardless of the position of S W E E P TIME/DIV
( 2 1 ) .
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