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Circuit Description — Type 5 1 6
FROM
TIME-BASE
GENERATOR
TO CRT
HORIZONTAL
DEFLECTION
PLATES
Fig. 4*6. H orizontal A m p lifie r block diagram .
HORIZONTAL AMPLIFIER
The Horizontal Amplifier consists of the Input Cathode
Follower, the Driver Cathode Follower, the Output Amplifier,
and the Output Cathode Follower stage. A block diagram
of the Horizontal Amplifier is shown in Fig. 4-6.
The sweep waveform is coupled to the grid of the Input
Cathode Follower, V343A, via the frequency-compensated
voltage divider, R330-R332. The HORIZONTAL POSITION
control, R333A, supplies a manually adjustable dc voltage to
the grid of V343A for horizontal positioning of the crt beam.
The C340-R340 network produces a small step at the start of
the waveform at the faster sweep rates. This step is necessary
to compensate for the bandpass-limiting effect of the stray
capacitance in the amplifier. By its application the sweep
will start linearly at the faster sweep rates. The Input Cath
ode Follower provides the necessary low impedance to drive
the switch capacitances and the Driver Cathode Follower,
V343B; the Driver Cathode Follower isolates the Output Am
plifier from the HORIZONTAL DISPLAY switch.
In the MAG. position of the HORIZ. DISPLAY switch, the
sweep waveform is coupled by the Driver Cathode Follower
directly to the Output Amplifier, V364A-V384A. This stage
is a cathode-coupled paraphase amplifier which converts the
single-ended input to a push-pull output. The waveform is
then coupled by the Output Cathode Follower stage, V364B-
V384B, to the horizontal deflection plates. The MAG. GAIN
ADJ., R259, varies the degeneration in the cathode circuit
of the Output Amplifier and thus sets the gain of the stage.
C260 reduces the degeneration at higher frequencies and
thus compensates the amplifier for faster sweep rates. Boot
strap capacitors C364 and C384 also improve the response
at the faster sweep rates by supplying current from the out
put cathode followers to charge the stray capacitance at the
plates of the Output Amplifier. Neon lamp B346 is connected
in the circuit when the HORIZ. DISPLAY switch is in the
MAG. position to indicate that the magnifier circuits are in
operation.
In the NORM, position of the HORIZ. DISPLAY switch, the
gain of the amplifier is reduced by a factor of five by nega
tive feedback. The feedback, from the cathode of V364B,
is developed across R225 and R347, which have been switch
ed into the grid circuit of V343B. When the HORIZ. DISPLAY
switch is in the NORM, position, both the MAG. GAIN ADJ.
R259, and the SWP. GAIN ADJ., R225, will vary the gain of
the Horizontal Amplifier; for this reason, the MAG. GAIN
ADJ. is adjusted only when the HORIZ. DISPLAY switch is in
the MAG. position.
The SWP./MAG. REGIS, adjustment, R358, sets the dc level
at the grid of V343B so that the portion of the waveform at
the horizontal center of .the graticule will not shift as the
HORIZ. DISPLAY switch is switched between the NORM, and
MAG. positions.
In the EXT. position of the HORIZ. DISPLAY switch, the
grid of the Driver Cathode Follower is connected to the EXT.
HORIZ. INPUT connector on the front panel. With this ar
rangement, the horizontal signal is obtained from an exter
nal source rather than from the Time-Base Generator. The
HORIZ.-INPUT ATTEN. control, R349 (ganged with the STA
BILITY control), provides adjustable attenuation of the ex
ternally applied signal. Horizontal positioning is provided
by R333B rather than R333A when the HORIZ. DISPLAY switch
is in the EXT. position.
Placing the HORIZ. DISPLAY switch in the EXT. position
also disables the Time-Base Generator by opening the cath
ode circuit of the Sweep-Gating Multivibrator.
POWER SUPPLY
Plate and filament power for the tubes in the Type 516
Oscilloscope is furnished by a single transformer, T601. The
primary has two equal tapped windings which are connected
in parallel for 117-volt operation or in series for 234-volt
operation. Two auxiliary windings are also provided to
furnish aiding or bucking currents, as desired, for certain
other primary source voltages (see Section 2).
The three main full-wave power supplies furnish regulated
voltages of —150, +100, and +300 volts. The +300-volt
supply also has an unregulated output of about 400 volts
4-9
Содержание 516 series
Страница 5: ... Type 516 ...
Страница 19: ...NOTES Type 516 ...
Страница 39: ...NOTES Type 516 ...
Страница 54: ...Type 516 SECTION 7 MECHANICAL PARTS LIST 7 1 ...
Страница 55: ... Mechanical Parts List Type 516 FRONT 7 2 ...
Страница 61: ...Mechanical Parts List Type 516 REAR 7 8 ...
Страница 67: ...Mechanical Part List Type 516 LEFTSIDE 7 14 ...
Страница 73: ...Mechanical Parts List Type 516 TOP 7 20 ...
Страница 78: ...POWER VERTICAL AMPLIFIER CHASSIS Mechanical Parts List Type 516 7 25 ...
Страница 107: ...INPUT A INPUT ft T R IG G E R IN P U T C A L O U T A TYPE S I6 OSCILLOSCOPE ...
Страница 111: ... jY P O S C ILLO S C O P E F ...
Страница 114: ...T 1 1 TIM IN G I69 e SWITCH ...
Страница 116: ...C I R C U I T M U M tp S 2 2 5 T H R U 3 8 9 H O R IZ O N T A L A M P L IF IE R ...
Страница 117: ... ...
Страница 120: ... 97 O I V4 93B Z 6D JS VERTICAL OUTPUT STAGE e DELAY LINE C IR C U IT N U M tR S 5 0 T H R U 4 9 9 r p ...
Страница 122: ...P R IM A R Y FAN CO NNECTED FOR 2 3 4 V O PERATIO N I Co IC IR C U ITN U M B E R SI 600T H R U T 5 1 P O W E R SUPPLY ...
Страница 124: ...33 K UNBLANKING PULSE C IR C U IT N U M tP S 6 0 0 TH g U 8 6 9 C R T C IR C U IT TP o oA ...
Страница 125: ...C A L IB R A T O R M U L T IV IB R A T O R i o o v d i v IO O V SE VA RA wr T Y P E B IG O S C I L L O S C O P E ...
Страница 131: ...TYPE 516 CHANGE TO L460 L470 ELECTRICAL PARTS LIST CORRECTION 108 0170 01 0 5 HH 108 0170 01 0 5 HH S16 063 270 ...
Страница 132: ...TYPE 516 ELECTRICAL PARTS LIST AND SCHEMATIC CORRECTION CHANGE TO R478 311 0097 00 200 f t Var f M16 675 870 ...