SECTION 2
OPERATING INSTRUCTIONS
FUNCTIONS OF CONTROLS AND
CONNECTORS
TRIGGERING
LEVEL
TRIGGERING
MODE
Selects the amplitude point on the trig
gering signal where sweep-triggering oc
curs. When the knob is pulled out, greater
triggering range is offered for triggeiing
on higher amplitude signals. The trigger
ing circuit is most sensitive to small sig
nals with the TRIGGERING LEVEL control
pushed in and set to 0.
AUTO STABILITY position permits normal
triggering on signals with repetition rates
higher than about 20 cps. With no trigger
signal, or with a lower repetition rate, the
time-base circuit free runs and provides a
handy reference trace.
TRIG (triggered) position permits normal
triggering on all triggering signals. No
trace occurs when the triggering signal is
removed.
SLOPE Determines whether the time base is trig
gered on the negative- (—) or positive-
( + ) going slope of the signal.
COUPLING AC position blocks the dc component of
the triggering signal and allows triggering
to take place only on the changing portion
of the signal. With frequencies below
about 30 cps, use the DC position.
AC LF REJ position attenuates signal fre
quencies below about 1.5 kc, allowing the
trigger circuits to respond only to higher
frequencies.
DC position permits triggering on both
high- and low- (to dc) frequency signals.
SOURCE INT NORM position uses a portion of the
signal applied to the vertical deflection
plates of the crt as a trigger signal.
INT PLUG IN position applies to multitrace
plug-in units that provide a single-channel
trigger signal through pin 5 of the inter
connecting plug (e.g. Tektronix Type 1A1
plug-in unit).
LINE position uses a line-frequency signal
as a trigger.
EXT position is for external triggering on a
signal applied to the TRIGGER INPUT con
nector.
HORIZONTAL NORMAL (XI) and SWEEP MAGNIFIER
DISPLAY positions connect the time-base circuitry to
the horizontal deflection system of the
Type 544. The SWEEP MAGNIFIER posi
tions expand the display horizontally by
the amount indicated. Sweep-rate accu
racy is ±5% in the magnified positions.
EXT position allows an external signal to
drive the horizontal deflection system of
the Type 544. The horizontal deflection
factor is set by the EXTERNAL HORIZON
TAL VOLTS/CM switch.
EXTERNAL
HORIZONTAL
VOLTS/CM
VARIABLE
Selects the horizontal deflection factor
when the HORIZONTAL DISPLAY switch is
set to EXT.
SINGLE SWEEP
READY Lamp
HORIZONTAL
POSITION
VERNIER
AMPLITUDE
CALIBRATOR
5 mA Current
Strap
POWER
INTENSITY
FOCUS
ASTIGMATISM
TRACE
ROTATION
SCALE ILLUM
Permits single sweep operation at all set
tings of the HORIZONTAL DISPLAY switch
except EXT.
Lights when the time-base circuit is trig-
gerable.
Positions the display along the horizontal
axis of the crt.
Determines the peak-to-peak voltage avail
able at the CAL OUT connector.
Provides a calibrated source of square-
wave current. The arrow shows direction
of conventional current flow (i.e. positive to
negative).
Toggle switch for turning the instrument on
and off.
Controls brightness of the display.
Used in conjunction with the INTENSITY
and ASTIGMATISM controls for obtaining
a well-defined display.
Used in conjunction with the INTENSITY
and FOCUS controls for obtaining a well-
defined display.
Permits horizontal alignment of the trace
with respect to the horizontal lines of the
graticule.
Varies illumination of the grid lines of the
graticule.
TIME/CM
VARIABLE
Selects the sweep rate of the time base.
Provides an uncalibrated adjustment of
sweep rate. The sweep rate can be slowed
by a factor of at least 2.5X. An UNCALI
BRATED lamp lights when the VARIABLE
control is not in the CALIBRATED position.
Beam Position Four neon lamps with accompanying ar
rows indicate the direction when the dis
play is deflected out of the viewing area.
TRIGGER INPUT Connector for applying an external trigger
signal to the time base when the SOURCE
switch is set to EXT.
2-1
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