Tektronix 502A, Instruction Manual

Page: 18 / 110

Operating Instructions — Type 502A
INTENSITY BALANCE —
Balances the intensity
of the two beams for
equal light output.
FOCUS — Focuses upper
and lower beam dis­
play.
INTENSITY — Controls
intensity of upper and
lower beams.
POWER and SCALE IL-
LUM. — Controls the
illumination of the grati­
cule and is the power
switch for the instru­
ment.
INPUT SELECTOR—Con­
nects inputs from se­
lected input connec-
torls) to vertical am­
plifier and also selects
either AC or DC coup­
ling of the input signal.
TRIGGER SELECTOR —
Determines whether trig­
gering occurs on the
rising portion (+
Slope) or falling por­
tion (— slope) of the
triggering waveform.
Also selects AC or DC
mode.
TIME/CM —Selects de­
sired sweep rate.
AMPLITUDE CALIBRATOR
—Controls amplitude of
the calibrator square
waves at the CAL OUT
connector.
TRIGGERING LEVEL—
Selects the voltage point
on the triggering wave­
form
where the sweep
is triggered. Also se­
lects AUTOMATIC or
RECURRENT operation.
MODE— Provides means
of obtaining single
sweep of display across
the face of the crt.
FINDER —Reduces verti­
cal amplifier gain by
100 times to enable the
trace to appear on the
crt.
HORIZONTAL DISPLAY—
Selects 1, 2, 5, 10 or
20 times horizontal
magnification of the dis­
played waveform. Also
controls horizontal sen­
sitivity for external in­
puts applied at the ex­
ternal connector.
POSITION — Positions
both upper and lower
beams horizontally.
SENSITIVITY — Selects
the sensitivity of the
vertical amplifier.
POSITION — Positions
trace vertically.
DC BALANCE—Balances
vertical amplifier o n
high ranges of sensitiv­
ity control.
Fig. 2-14. Functions of the Type 502 front panel controls.
2-12