Elenco 30MHz Dual Trace - Manual (Page 38)

MIX: The main and delayed sweep share a single trace; main sweep occupies
the left portion of the display; delayed sweep occupies the right portion of the
display. The DELAY TIME POSITION control determines the percentage of
display that is main sweep and the percentage of display that is delayed sweep
(main sweep is usually brighter than the delayed sweep). Delayed sweep
speed cannot be slower than main sweep speed.
DELAY: Only delayed sweep operates, while main sweep stays inactive.
DELAY TIME POSITION control determines the starting point of the delayed
sweep.
X-Y: Used with the VERTICAL MODE switch and TRIGGER SOURCE switch
to select X-Y operating mode. The channel 1 input becomes the X-axis and the
channel 2 input becomes the Y-axis. Trigger source and coupling are disabled
in this mode.
TRIGGERING CONTROLS
HOLDOFF/PULL NORM TRIG Control(21):
HOLDOFF:
Rotation adjusts hold off time (trigger inhibit period beyond sweep duration).
When control is rotated fully counterclockwise, the hold off period is MINIMUM
(normal). The holder period increases progressively with clockwise rotation.
PULL NORM TRIG: When pushed in, selects automatic triggering mode. In
this mode, the oscilloscope generates sweep (free runs) in absence to
triggered sweep operation when an adequate trigger signal is present.
Automatic triggering is applicable to both the main sweep and delayed sweep.
When pulled out, selects normal triggered sweep operation. A sweep is
generated only when an adequate trigger signal is present.
TRIGGER SOURCE Switch: Selects source of sweep trigger. Four-position
lever switch with the following positions:
CH 1/X-Y
CH 1: Causes the channel 1 input signal to become the sweep trigger,
regardless of the VERTICAL MODE switch setting.
X-Y: Used with two other switches to enable the X-Y mode-see the Operating
Instructions under “XY Operation”.
CH 2: The channel 2 signal becomes the sweep trigger, regardless of the
VERTICAL MODE switch setting.
ALT: Alternate triggering, used in dual-trace mode, permits each waveform
viewed to become its own trigger source.
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CONTROLS AND INDICATORS