Tektronix 511A-AD, Instruction Manual, Page: 6 / 75

PANEL MARKINGS EXPLANATION INTENSITY
INPUT CHAN.
SEL.
Gang switch permitting the input
signal to be connected to the vertical
deflection plates either directly, via a
.1 mfd capacitor, 1 stage amplifier, or
2 stage amplifier.
Potentiometer controlling the average
grid voltage of the CRT and thereby
the brightness of the image.
POWER On-off switch in the AC line voltage
supply to the oscilloscope.
INPUT
ATTENUATOR
Four position RC compensated attenu­
ator located between the SIGNAL
CALIBRATE switch and INPUT CHAN.
SEL. for reducing the voltage of signals
which would otherwise produce exces ­
sive deflection or overload the ampli­
fiers.
FOCUS Potentiometer controlling the voltage
applied to the focus anode of the CRT
and thereby the sharpness of the
image.
VERT. AMPL.
ATTEN.
500 ohm potentiometer in cathode of
cathode follower permits adjusting
gain of signal amplifier.
HOR. POSITION Potentiometer controlling the bias ap ­
plied to grid of one sweep amplifier
tube and thereby the position of the
image.
SWEEP Binding post connected to sweep gen-
OUTPUT erator via cathode follower.
SIGNAL —
CALIBRATE
Switch which connects arm of INPUT
ATTENUATOR to EXT. CAL. binding
post, SIGNAL INPUT binding post, or
line frequency calibrating voltages.
SWEEP
MAGNIFIER
POSITION
SIGNAL INPUT Coaxial connector permits connection
of the low capacity probe or binding
post adapter.
Potentiometer controlling voltage ap ­
plied to grid of sweep magnifier (V 11)
and thereby determining portion of
sweep to be magnified. When turned
to OUT sweep magnifier is discon­
nected from the circuit.
DELAY
(511 -AD only)
Two position switch which permits the
Type 1AD25
Delay Network
to
be
switched in or out of the video ampli­
fier.
SWEEP
SPEED
MULT.
Decade control
plus
vernier
control
setting sweep speed and duration
within range indicated by SWEEP
RANGE.
VERT.
POSITION
Twin potentiometers controlling aver­
age potentials of vertical deflection
plates and therefore the image posi ­
tion.
EXT. SWEEP
ATTEN.
Potentiometer controlling the fraction
of the voltage applied to EXT. SWEEP
INPUT
binding
post
which will
reach
the grid of the sweep amplifiers when
the
SWEEP RANGE switch is set
in the
EXT. position.
CAL. VOLTAGE Potentiometer for adjusting the clipped
sine wave calibrating voltage of line
frequency on ranges determined by
the
setting
of
the
SIGNAL CALIBRATE
switch.
CRT CATHODE Binding post permitting connection of
external modulating signals to the
cathode of the cathode ray tube via a
.1 mfd capacitor. RC=. 0 12 sec.
GND. Connection to frame of oscilloscope.
ASTIGMATISM Potentiometer varying potential on
Anode No. 2 with respect to the de ­
flection plates. Correct adjustment of
this control makes possible a sharp
focus of
the
image in
both
directions
simultaneously.
SCALE ILLUM. Variable resistor controlling brightness
of the lamp which illuminates the plas ­
tic graticule over the face of the cath­
ode ray tube.
EXT. SWEEP
INPUT
CAL. INPUT
CAL. OUTPUT
+ GATE
Binding post connecting to sweep am ­
plifier via EXT. SWEEP ATTEN. when
SWEEP RANGE switch is in EXT. posi­
tion. (100 K input impedance).
Binding post connecting to EXT. CAL.
position of SIGNAL CALIBRATE switch
permitting an external calibrating sig ­
nal source to be permanently con­
nected to the oscilloscope.
May be used as auxiliary signal input
Binding post connected to arm of
CAL. VOLTAGE potentiometer permits
use of internal calibrating voltage as
an external test signal of known am ­
plitude.
Binding post for connection to the cath ­
ode of the gate phase splitter (V8). This
furnishes a 40 V peak positive pulse of
the same duration as the sweep.
TYPE 511-A, 511-AD SECTION 1, PAGE 2