Tektronix 543B Instruction Manual page 7

OPERATING INSTRUCTIONS
f u n c t i o n
o f c o n t r o l s a n d c o n n e c t o r s
C-GERING Selects the amplitude point on the trigger-
_=V:L ing signal where sweep-triggering occurs.
S'ABiLITY Adjusts the oscilloscope for a stable dis­
played waveform. The STABILITY control
can be set to the PRESET position and
left there. This position provides for con­
venient triggering since only the TRIGGER­
ING LEVEL control needs to be adjusted
to obtain a stable display.
"< GGERING AUTO: Permits normal triggering on smipie
••'.ODE waveforms with
than about 50 cps. With no trigger signal,
or with a lower repetition rate, the trigger
circuit free runs at approximately 40 cps
and triggers the time base at this rate, pro­
providing a reference trace.
AC LF REJ: Attenuates trigger-signal fre­
quencies below about 17 kc, allowing the
trigger circuit to respond only to higher
frequencies.
AC: Blocks the dc component of the trig­
gering signal and allows triggering to fake
place only on the changing portion of the
signal. With frequencies below about 30
cps, use the DC position.
For best triggering at high frequencies,
use an ac coupling position of the TRIG­
GERING MODE switch.
DC: Permits triggering on both high- and
low-frequency (to dc) signals.
TRIGGER SLOPE Determines whether the time base is trig­
gered on the negative- (—) or posifive-
(+ ) going slope of the signal.
LINE: Uses a line-frequency signal as a
trigger.
INT: Uses a portion of the signal applied
to the vertical deflection plates of the
erf as a trigger signal.
EXT: Provides external triggering on c
signal applied to the TRIGGER INPUT
connector.
TIME/CM Selects the time-base sweep rate.
TIME/CM Provides an uncalibrafed sweep rote ad-
VARIABLE justment. The sweep rate can be slowed
to at least 0.4X any setting of the TIME/
CM switch.
lights when the VARIABLE control is not
in the CALIBRATED position.
SECTION 2
repetition rates higher
An UNCALIBRATED lamp
HORIZONTAL NORMAL ( X I) and SWEEP MAGNIFIED
DISPLAY positions expand the display horizontally
by the amount indicated. Sweep-rate ac­
curacy is r=5% in the magnified posi­
tions.
EXT position allows an external signal
to drive the horizontal deflection system.
The horizontal deflection factor is set by
the EXTERNAL HORIZONTAL VOLTS/CM
switch and variable.
The MAGNIFIER ON lamp lights when­
MAGNIFIER
ever the HORIZONTAL DISPLAY switch is
Lamps
in any of the SWEEP MAGNIFIED posi­
tions. The MAGNIFIER UNCALIBRATED
lamp is connected to light whenver the
sweep rate exceeds the maximum cali­
brated rate of 0.02 /tsec/cm. This lamp
will not light as long as the setting of
the TIME/CM switch, divided by the mag­
nification factor is not faster than 0.02
usee.
EXTERNAL Selects the horizontal deflection factor
when the HORIZONTAL DISPLAY switch
HORIZONTAL
VOLTS/CM is set to EXT. The VARIABLE control must
VARIABLE be fully clockwise when using the cali­
brated horizontal deflection factors.
Permits single sweep operation at all
SINGLE SWEEP
settings of the HORIZONTAL DISPLAY
switch except EXT.
READY Lamp Lights when time-base circuit is ready for
triggering after being reset.
Positions the display along the horizontal
HORIZONTAL
POSITION and axis of the erf.
VERNIER
AMPLITUDE Determines the peak-to-peak voltage avail­
able at the CAL OUT connector.
CALIBRATOR
POWER ON Toggle switch for turning the instrument
power on and off.
INTENSITY
Controls brightness of the display.
Used in conjunction with the INTENSITY
FOCUS
and ASTIGMATISM controls for obtaining
a well-defined display.
ASTIGMATISM Used in conjunction with the INTENSITY
and FOCUS controls for obtaining a well-
defined display.
TRACE Permits horizontal alignment of the trace
ROTATION with respect to the horizontal lines of
the graticule. The TRACE ROTATION con­
trol is a screwdriver adjustment concentric
with the ASTIGMATISM control.
2-1