Sencore PS163 - MANUAL TRIGGERED; AUTO TRIGGERED; FREE RUNNING; TIME BASE-FREQUENCY

HORIZONTAL SWEEP
This pushbutton switch provides selection of four
different modes of time base operation.
MANUAL TRIGGERED
This mode provides manual control of the SYNC
LEVEL, and is the best to use when attempting to
view very low level signals. The CRT of the PS163
will be blanked in the MANUAL TRIGGERED mode
until the time base receives a properly adjusted trigger
pulse. (Refer to section on HORIZONTAL SYNC,
SYNC POLARITY, and SYNC LEVEL for proper ad-
justment of these controls).
AUTO TRIGGERED
In this mode, the time base will provide a free run-
ing sweep in the absence of a trigger signal. The time
base will automatically switch to true calibrated
triggered sweep operation as soon as a trigger signal
is applied. The SYNC LEVEL is preset, and the con-
trol is inoperative in this mode.
FREE RUNNING
The time base provides a free running sweep in this
mode, with sync automatically provided from the
source selected by the HORIZONTALSYNC SWITCH.
The TIME BASE - FREQUENCY switch serves as a
course frequency adjustment, with range of frequencies
indicated by the outer ring around the switch. The
fine frequency adjustment is the small center knob of
the TIME BASE - FREQUENCY switch, and is ad-
justed for a locked in pattern.
There is also a fourth mode of operation not specifi-
cally called out on the front panel. The horizontal
sweep will function in the automatic mode, with man-
ual adjustment of the SYNC LEVEL control if all
three HORIZONTAL SWEEP push buttons are in the
out position.
TIME BASE-FREQUENCY
This control consists of two separate sections. The
first is an outer switch showing sweep rate per div-
ision. This switch also shows the approximate sweep
rate in cycles per second to aid the technician in -
determining the correlation between time base rates
and frequency. Two additional positions (TV Hor-
HORIZONTAL SWEEP
MANUAL AUTO FREE
TRIGGERED JTRIGGERED | RUNNING
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EXTERNAL EXTERNAL
HORIZONTAL GROUND TRIGGER
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izontal and TV Vertical) provide preset sweep fre-
quencies for convenient display of television signals.
A sync separator circuit is automatically switched in
when the TV Vertical or TV Horizontal positions are
selected. The 60 Hertz position of this switch con-
nects the 60Hz line signal to the horizontal deflec-
tion amplifier. The phase can be adjusted by the
LINE SWEEP PHASE control.
The EXT. position allows an external signal to pro-
vide horizontal sweep. This signal should be con-
nected to the EXTERNAL HORIZONTAL jack.
The second section is the small knob in the center of
the outer switch. This control operates as an uncal-
ibrated fine frequency control in all normal sweep
positions, and as a horizontal gain control in the 60Hz
and EXT. sweep positions. For normal operation of
the calibrated sweep speeds, this control should be
turned to the clockwise end of its rotation until it
snaps into the detent provided. €