CATHODE-RAY OSCILLOSCOPE
TYPE 315D
SERIAL N U M BE R _______________
INSTRUCTION
MANUAL
M AN U F A CT U R E R S O F CA TH O DE -R A Y A ND V I DE O TE ST I N S T R U M E N T S
Sunset Highway and Barnes Road • P. O. Box 831 • Portland 7, Oregon, U. S. A.
Phone: CYpress 2-2611 • Cables: Tektronix
SECTION I Tim e Base Magnifier
General Description
The TEKTRONIX Type 315D cathode-ray oscil
loscope is a small compact and portable high-perform
ance laboratory instrument particularly designed to
occupy minimum space. The vertical bandwidth ex
tends to five megacycles from dc. Time-base ranges
extending from one microsecond per sweep to fifty
cycles per sweep are provided. An amplitude cali
brator and a time-base magnifier are also included.
Sensitivity
Twelve calibrated fixed sensitivities: ac only, 0.01,
0.02 and 0.0& volts per division, 5 cycles to 5 mega
cycles : dc and ac 0.1, 0.2, 0.5,1, 2, 5,10, 20, and 50 volts
per division. These sensitivities fit graticule divisions
for direct reading of voltages. Continuously variable
10 to 1 sensitivity multiplier control also available.
Calibrator
Square wave at approximately one kilocycle avail
able at front-panel UHF connector at four fixed peak-
to-peak voltages of 0.1, 1, 10, and 100 volts with accu
racy within 3 per cent.
Signal Delay
Quarter-microsecond signal delay line permits all
of the triggering waveform to be viewed.
Trigger Amplitude Discriminator
Permits time base to be triggered at any desired
amulitude point on the triggering waveform.
Time Base
Twenty-four fixed times per division between
0.1 microsecond and 5 seconds per division fit grati
cule divisions for direct reading of time. Continuously
variable 10 to 1 sweep-time control also available.
Magnifies time base to right and left of center by
factor of five times. Portion of trace appearing at cen
ter is made five times as wide.
Direct-Coupled Unblanking
Accommodates slowest sweeps.
Cathode-Ray Tube
Flat-faced high definition three-inch tube.
Graticule
Quarter-inch divisions, 8 lines vertically, 10 lines
horizontally. Variable-intensity edge lighting.
Power Supply
Four electronically regulated plate-voltage supplies.
Power transformer will operate on either 117 or 234
volts, 50 to 800 cycles. (Special ventilating fan re
quired for other than 50- to 60-cycle operation.)
Crt Accelerating Voltage
1630 volts from electronically regulated rf oscillator
high-voltage supply.
Ventilating Fan
The Type 315D is normally supplied with a
50- to 60-cycle induction-motor fan. For frequencies
much above 60 cycles a dc commutator motor and
selenium rectifier are available at extra cost to extend
the range to 800 cycles.
Dimensions
12^s" high, 8 $4 " wide and I8V4" long.
Weight
36 lbs.
Construction
Welded aluminum alloy.
Finish
Anodized photo-etched aluminum panel, grey
crackle enamel case.
SECTION I, PAGE 1
TYPE 315D
Functions of Front-Panel Terminals
and Controls
5X MAGNIFIER
(Red label,
red knob)
Vertical Amplifier
MULTIPLIER Four-position switch to multiply
VOLTS/DIVISION by factors
of 1, 2, or 5. Fourth position
marked 10-1 in red permits red
coaxial knob to adjust multiplier
continuously over 10 to 1 range.
INPUT Coaxial UHF connector for con
necting signal to vertical-deflec
tion system.
AMPLITUDE Seven - position control provides
four fixed ac sensitivities and three
fixed dc sensitivities.
FOCUS Adjusts voltage of focusing anode
to provide focusing.
INTENSITY Adjusts control-grid voltage to
control brightness of trace.
SCALE ILLUM Adjustable series resistor in grati
cule lighting circuit to control
amount of scale illumination.
POSITION
HORIZ.
Adjusts average voltage of hori
zontal deflection plates to position
trace horizontally.
VERT. Adjusts average voltage of verti
cal deflection plates to position
trace vertically.
TIME BASE Four-position switch to multiply
MULTIPLIER time-base TIME/DIVISION by
factors of 1, 2, or 5. Fourth posi
tion marked 10-1 in red permits
red coaxial knob to adjust multi
plier continuously over 10 to 1
range.
RANGE Eight - position switch provides
eight fixed time base times per di
vision in decade ratio between
0.1 microsecond per division to
1 second per division.
CALIBRATOR
TRIGGER
SELECTOR
STABILITY
(Red label,
red knob)
TRIGGER
AMPLITUDE
DISCRIMI
NATOR
POWER ON
CAL OUT
EXT TRIGGER
AC Binding
Post
DC Binding
Post
-(-GATE
SAWTOOTH
GND
Two-position switch turns time-
base magnifier on in clockwise po
sition, returns time base to normal
in counterclockwise position.
Five-position switch selects four
fixed peak-to-peak squarewave
voltages of 0.1, 1, 10, or 100 volts.
Turns calibrator oscillator off in
fifth position.
Ten-position switch selects trigger
source and accommodates trigger
circuits to rising or falling trigger
waveforms. Accommodates trig
ger circuits to fast-rising or slow-
rising triggering waveforms.
Adjusts voltages of gating multi
vibrator so that it can be set for
recurrent operation or at the
threshold of recurrent operation
for triggered sweeps.
Continuously variable voltage con
trol determines point of operation
of trigger-inverter stage to select
point on triggering waveform at
which time-base circuit is tripped.
AC supply off-on toggle switch.
Coaxial UHF connector for output
of calibrator oscillator.
Connects to EXT. positions of
TRIGGER SELECTOR switch
through capacitor.
Connects directly to EXT. posi
tions of TRIGGER SELECTOR
switch.
Binding post provides 25-volt posi
tive gating pulse coincident with
time base.
Binding post provides positive
going sawtooth voltage coincident
with time base.
Binding post connected to frame
of instrument.
TYPE 315D
SECTION I, PAGE 2
SECTION II
Operating Instructions
The TEKTRONIX Type 315 Oscilloscope may be
operated in any indoor location or in the open if it is
protected from moisture.
Ventilation
Forced-air cooling is required so that care must be
taken to avoid obstructing the air intake to the cir
culating fan.
WARNING: The Type 315D Oscilloscope
should not be operated unless the fan is run
ning. The interior will reach dangerous tem
peratures within five to ten minutes of such
operation.
The operation of the calibrator and the trigger cir
cuits of the Type 315 oscilloscope is enough different
that it is especially important for users familiar with
previous TEKTRONIX oscilloscopes to understand
the difference.
The vertical amplifier is sufficiently stable that once
the gain has been standardized, voltages can be read
directly from the graticule just as you would read a
voltmeter. For this reason, the calibrator in the
Type 315 is not continuously variable in amplitude as
are the calibrators in previous TEKTRONIX oscil
loscopes. The calibrator is intended to be used as a
source of squarewave voltage, operating in the vi
cinity of one kilocycle, available at four accurate fixed
voltage levels, 0.1, 1, 10, and 100 volts, peak to peak.
It is useful to supply a signal for aligning the vertical
amplifier, and the attenuator and probe, as well as for
standardizing the gain of the vertical amplifier to the
graticule calibrations.
To check the calibration of the vertical amplifier,
make a connection between the CAL OUT terminal
and the INPUT terminal. Then, for example, set the
VERTICAL AMPLIFIER MULTIPLIER selector
to 2, the AMPLITUDE selector to DC, 0.1, and the
CALIBRATOR to 1 volt, peak to peak. With these
settings, there should be exactly five graticule divi
sions deflection of the trace. The amplifier gain can
be corrected for any difference by means of a screw
driver adjustment in the center of the AMPLITUDE
selector switch.
To use the Type 315 for making an amplitude
measurement, place the AMPLITUDE selector in the
approximate range of sensitivity desired, and the
MULTIPLIER selector on any one of the three steps,
1, 2, or 5. Each division of the graticule then cor
responds to a voltage which can be determined directly
by multiplying the AMPLITUDE and the MULTI
PLIER scale readings.
In the most counter-clockwise position of the
MULTIPLIER selector, a continuously-variable gain
is provided over a range of 10 to 1, marked in red. In
this selector position, varying the red knob mounte.
coaxially with the AMPLITUDE selector knob varies
the gain over the 10 to 1 range.
In addition to the coaxial red knob on the AMPLI
TUDE selector switch, there are three other red knobs
mounted in a like manner on the TIME BASE and
TRIGGER controls. In each case, a red scale on the
panel pertains to the position or to the function of
the red knob.
In the operation of the time base of the Type 315
oscilloscope, the TRIGGER AMPLITUDE DIS
CRIMINATOR control is likely to be somewhat con
fusing to users familiar with previous TEKTRONIX
instruments. This control is not in any sense a trigger
amplitude adjustment. The triggering circuit is direct
coupled to the vertical amplifier in the INT positions
of the TRIGGER SELECTOR switch, both for the
AC and DC connections of the vertical amplifier and
is direct coupled to one of the EXT TRIGGER panel
connectors. The TRIGGER AMPLITUDE DIS
CRIMINATOR control determines by amplitude the
portion of the triggering waveform at which trigger
ing occurs. At settings of the DISCRIMINATOR
control near zero, triggering will occur at a point on
the waveform near zero. If the zero signal trace is
centered on the screen, triggering will occur at a point
on the trace above the center of the screen. Regardless
of the amplitude of the waveform, triggering will
occur at a point on the trace the same distance above
the center of the screen, provided that the wave
reaches that amplitude. The negative trigger positions
of the TRIGGER SELECTOR control refer to the
direction of slope of the triggering waveform at which
triggering occurs. For example, to trigger the sweep
from a sine wave at a point beyond the peak but above
zero, the TRIGGER SELECTOR should be placed
in one of the negative trigger positions and the TRIG
GER AMPLITUDE DISCRIMINATOR should be
turned to a positive position.
For slow rise signals whose rise time is longer than
SECTION II, PAGE 1 TYPE 315D
one microsecond, the TRIGGER SELECTOR should
be placed in one of the SLOW RISE positions of the
scale. In these positions of the control, a regenera
tive trigger generator produces sharp triggers suitable
for initiating the sweep regardless of the rise time of
the input wave. For the FAST RISE positions, the
trigger generator is not regenerative and is capable
of producing faster triggers so that for high frequency
or fast rise time signals, the TRIGGER SELECTOR
switch should be in one of these positions. The best
way to determine which position is proper for a mar
ginal type of signal is to try both positions. There is
appreciable overlap.
Generally speaking, there is no difference in trigger
sensitivity in the different control positions. A change
in voltage which will produce a quarter of a division
deflection, will easily initiate a trigger at any speed
or in any part of the wave. For a small amplitude
wave, the TRIGGER DISCRIMINATOR control will
need to be set near zero. With settings near maximum
either clockwise or counterclockwise, a large trace will
be required to initiate a sweep and the point of initia
tion will be near the top or bottom of the waveform.
Calibrations on the DISCRIMINATOR dial are
approximately in volts for externally connected trig
ger voltages. For internally derived triggers, approxi
mately seven divisions on the DISCRIMINATOR
scale corresponds to about ten graticule divisions of
deflection.
The magnifier circuit expands to right and left the
portion of the trace that is centered on the screen.
Horizontal positioning precedes the magnifier circuits
so that this control is used for both the normal and
magnified trace.
Placing the Type 315D Oscilloscope in Operation
for the F irst T ime
The following procedure is suggested when you
put the instrument into service for the first time:
1. Set the panel controls as follows:
POWER OFF
VERTICAL AMPLIFIER MULTIPLIER. .2
VERTICAL AMPLIFIER
AMPLITUDE.DC, 0.1 VOLTS/DIVISION
FOCUS ...............................................CENTER
INTENSITY
.......
COUNTERCLOCKWISE
SCALE ILLUM..................................CENTER
HORIZ. POSITION
..........................
CENTER
VERT. POSITION
............................
CENTER
TIME BASE MULTIPLIER
..........................
1
TIME BASE RANGE................1 MILLISEC.
CALIBRATOR
.....................................
1 VOLT
TRIGGER SELECTOR.SLOW RISE, +INT.
STABILITY
.........
COUNTERCLOCKWISE
TRIGGER AMPLITUDE
DISCRIMINATOR
................................
—50
2. Connect the power cord to a source of ac power
capable of supplying 4 amperes at 117 volts at
60 cps. (240 volts if power transformer is so con
nected, and 50 to 800 cps for the universal-fre
quency model.)
3. Make a connection between the CAL OUT
terminal and the INPUT terminal. Turn the
POWER switch to ON, and permit the instru
ment to warm up for about a minute.
4. Advance the INTENSITY control clockwise a
little past center.
5. Advance the STABILITY control until a trace
appears on the screen.
6. Adjust the FOCUS and INTENSITY controls
for a sharp trace and satisfactory brightness.
7. Adjust the two POSITION controls until the
trace is centered on the screen as desired.
8. Return the STABILITY control clockwise until
the trace just disappears and return the TRIG
GER AMPLITUDE DISCRIMINATOR con
trol clockwise toward O until the calibrator
waveform appears on the screen.
The stability control determines whether the multi
vibrator retriggers itself or whether it returns to a
stable condition after executing a single sweep for
each trigger received.
In the SLOW RISE positions of the TRIGGER
SELECTOR switch the regenerative trigger gener
ator produces triggers of the same amplitude when
tripped regardless of the amplitude or speed of the
triggering waveform. The STABILITY control
should therefore be set at such a level that a trigger
output of this amplitude will trigger the sweep and
thereafter no change in the STABILITY control set
ting will be needed. The trigger sensitivity is the volt
age difference needed to trip the regenerative trigger
TYPE 315D
SECTIO N II, PAGE 2
generator, which is determined by the gain between
halves of this generator. There is no front-panel con
trol of this gain, but there is an internal screwdriver
adjustment which should not be changed, however,
except possibly after replacing the generator tube.
In the FAST RISE positions of the TRIGGER
SELECTOR switch regeneration between the halves
of the trigger-generator tube is effectively removed
by shorting out the plate-load resistor of the input
pentode section. Since the circuit thus becomes a
cathode-coupled amplifier, the amplitude of the out
put triggers is dependent on the differentiated rise 0 1
the triggering waveform. For slow-rising waveforms,
therefore, the output trigger will be too small to trip
the time-base generator. The point of transition at
which better triggering will result from one or the
other of the switch positions is not critical. For rise-
times near one microsecond it will be well to try both
types of operation. Triggering from the calibrator
waveform will be more satisfactory with the TRIG
GER SELECTOR switch in the SLOW RISE
positions.
®
SECTION II, PAGE 3 TYPE 315D
SECTION III
Circuit Description
Sweep Circuit
The time base of the TYPE 315 CATHODE-RAY
OSCILLOSCOPE is generated by means of a Miller
runup generator. New circuitry eliminates the usual
distortion of the early part of the sawtooth. A con
stant current charging source to the timing capacitor
improves the sawtooth linearity.
The triggering signal is selected by means of the
TRIGGER SELECTOR switch connected to the B
section of a cathode-coupled phase inverter, V201,
with a gain of about six at each plate. The A section
grid is connected to the arm if a potentiometer so that
its bias can be varied over a wide range. By adjusting
the bias properly you can select the portion of the trig
gering wave form that triggers the sweep.
A second section of the trigger selector switch con
nects the output of B section plate to the trigger gen
erator, V202, for negative-going triggering waveforms
and the A section plate for positive-going triggering
waveforms.
The trigger generator consists of V202, as a bistable
multivibrator for slow-risetime trigger signals, and
as a cathode-coupled amplifier for fast-risetime trig
ger signals. For signals with a risetime slower than
one microsecond, the multivibrator circuit will pro
vide the best trigger signal. In the SLOW RISE posi
tions of the TRIGGER SELECTOR switch, SW201,
C227 connected between the triode-section grid and
pentode-section plate of V202 provides the regenera
tion. For faster rising trigger signals, the FAST RISE
positions of.th'e switch effectively removes the regen
eration by shorting out plate-load resistor R220 in the
pentode section of V202. V202 thus becomes a cathode-
coupled amplifier.
Trigger output voltage is taken from the plate of
the triode section of V202. The plate load is inductor-
resistor differentiating circuit, L221, R221, so that a
reasonably fast transition is required to develope large
enough triggers to' operate the sweep circuit. The
multivibrator performs this fast transition for trig
gering waves otherwise too flat. It will perform a
regenerative transition in either direction for the slow
est risetime signals.
The sharp trigger signal is capacitance coupled into
V203, a cathode-coupled stage whose output is direct
coupled through cathode follower V204A to the junc
tion of the plate of V211A and the cathode of V211B
of the cascode Eccles-Jordan multivibrator. A posi
tive signal on the B section grid of V203 is required
to trigger the multivibrator. The B section of V203
is also connected to a bias-control potentiometer called
STABILITY which sets the dc level.
V204B, and V205 A and B surrounding V204A com
prise a hold-off circuit. The function of the hold-off
circuit is to reduce the voltage on the grid of the trig
gering cathode follower, V204A, during the sweep ana
for a short period after the multivibrator has recov
ered. V205B performs this function. During the
sweep, V205B conducts so that its plate drops. At
the termination of the sweep, V205B is cut off and
its plate rises toward 225 volts positive. A switched
capacitor between plate and ground delays this rise
toward +225 volts during the charge period, depend
ing on the size of the capacitor. When the plate of
V205B reaches 100 volts positive it is clamped to this
voltage by diode-connected V205A. The trigger am
plifier is so designed that it will trigger the multivi
brator only when its plate is in the vicinity of 100 volts,
so that triggering is held off during the rise period of
the plate of V205B.
V211 and V212 comprise the cascode Eccles-Jordan
multivibrator. The left-hand side of this multivibrator,
V211 A and B are normally conducting. Triggering
is accomplished with a positive trigger through V203
to cathode follower V204A causes it to divert current
from the upper half of V211, so that the plate rises.
The positive step at V211B plate is coupled through
cathode follower V210B to the grid of the opposite
lower side of the multivibrator, V212B, and the multi
vibrator flops over with conduction on the right-hand
side. Cathode follower V210B acts as a buffer between
the plate of V21 IB and all other external loads so that
the only additional capacitance is that added by the
input capacitance of the cathode follower. This per
mits the plate to execute a much more rapid rise. The
cathode follower drives the opposite side of the multi
vibrator, the unblanking cathode follower, the hold-off
tube, V205B, and the gate output cathode follower,
V214A.
The sweep is gated by the negative-going portion
of the multivibrator, V212A and B. The plate of
V212A is connected to the grid of the cathode-follower-
connected pentode section of V214 through a speed-up
capacitor. The cathode of this cathode follower holds
SECTION III, PAGE 1
TYPE 315D
the grid of V220 at about —3 volts through diode V21S
during the quiescent state of the multivibrator. The
negative step from the multivibrator cuts off the
cathode follower and the cathode falls, disconnecting
the grid of V220 through diode V215. V220 is the
Miller tube time base generator. When the grid is
freed from V214B cathode, it immediately begins to
drop and the plate begins to rise. The plate of V220 is
coupled back to the grid through cathode follower
V212A and the timing capacitor, and a Miller run up
commences. When the plate has risen to the vicinity
of 200 volts, the grid of cathode follower V213B has
risen to about 100 volts so that current begins to flow
in this tube which diverts current from the upper right
Section of the multivibrator, V212A, and the multivi
brator reverts to the initial stage with the left-hand
side conducting. When V212A plate rises, it carries
the grid of V214B with it causing diode V215B to
conduct and the Miller grid to rise to —3 volts so
that the plate drops again to the starting position.
The additional circuitry around the Miller tube and
direct-coupled Eccles-Jordan multivibrator is pro
vided to raise the maximum sweep speed and to elimi
nate the usual distortion of the sawtooth at the begin
ning of the Miller run-up action.
Since the multivibrator has no timing-circuit com
ponents, its recovery time of about 1 microsecond is
dependent largely on tube and wiring capacitance,
and is therefore more or less constant over the entire
range of time bases. For the longer time bases, as
much as a millisecond is required to discharge the
timing capacitor, so that circuitry is needed to prevent
the multivibrator from being triggered before the Mil
ler tube has returned to its quiescent state. The re
quired hold-off function is produced by lowering the
plate return voltage of the trigger amplifier V203A
for an adequate period after the time base termination.
Furthermore, a sharp differentiated pulse must be de
rived from a triggering waveform to trigger the multi
vibrator so as to prevent the multivibrator from re
triggering after the hold-off circuit has reached qui
escence, in the presence of a sustained triggering
waveform.
The circuit complication around the Miller tube re
moves the step from the start of the Miller run up.
This is accomplished by means of a dc feed back net
work from the plate of the Miller tube back to its grid,
which causes an equilibrium point to be established
where the plate of the Miller tube is resting at about
50 volts positive whenever the grid of the gating
cathode follower, V214B, is held in a positive direction
by the right-hand multivibrator, and the grid is at
—3 volts. This is well within the class A region of the
Miller tube, V220, where the plate voltage is directly
proportional to the grid voltage. The relationship of
50 volts plate to —3 volts grid voltage is therefore
determined by the grid to plate relationship of the
Miller tube itself in the class A region of its operation.
The actual grid voltage set by the voltage-divider
cathode follower arrangement with V214B through
disconnecting diode V215B and constant-current tube
V213A, determines the starting voltage of the saw
tooth. When diode V215 B disconnects the Miller tube
grid from the divider constant-current tube V213A
attempts to sustain the current, which it does by re
ducing its plate resistance, thereby pulling the Miller
tube grid downward. During the period of the run up,
the timing-capacitor charging current is kept essen
tially constant by action of the constant-current tube.
The charging current remains constant within about
a tenth of a per cent, but the time base is not this
linear because of the variation of capacitance with
voltage of the timing capacitors.
The sawtooth voltage is fed to the output amplifier
through cathode follower V221A by means of a volt
age divider so that horizontal positioning can be ac
complished. Cathode follower V221B prevents grid
current from flowing in the positioning circuit, and
cathode follower V222A prevents grid current from
flowing in the MAG-NORM feedback network. This
network reduces the net gain of the horizontal ampli
fier by a factor of five in the NORM position, and
permits the full gain to be realized when it is in the
MAG position.
The horizontal-output amplifier stage is a cathode-
coupled phase inverter with a cathode-follower coup
ler to each deflection plate. Use of the cathode fol
lowers to drive the deflection plates increases the
horizontal bandwidth by a factor of about three times.
Magnifier
A degenerative network between the plate of V224B
of the output amplifier to the grid of cathode follower
V222A reduces the loop gain by a factor of five in
the NORM position of the MAG-NORM switch. In
the MAG position, the network is opened to permit
the amplifier to operate at full gain. The MAG POSI
TION screwdriver control permits the dc level of the
cathode follower to be set at the same value for both
positions. Another screwdriver adjustment labeled
MAG GAIN ADJ on the chassis permits the magni
fied time base to be made exactly five times the nor
mal time base. The HORIZ POSITION control pre
cedes the magnifier circuits and therefore positions
for both the magnified and the normal time bases.
TYPE 315D
SECTIO N III, PAGE 2
Vertical A mplifier
VI is a twin-triode with the two sections operated
in parallel. The signal is taken from the common
cathode connection of VI and applied to the cathode
of V2A. V2A is operated as a grounded-grid ampli
fier. V2B is a cathode-follower output coupler be
tween V2A plate and V3 grid. The preamplifier is
used only on the AC, .01 VOLTS/DIVISION posi
tion of the AMPLITUDE selector switch. In this
switch position, switch section SW1B connects the
input terminal through Cl to the grid of VIA and B,
and SW1C connects the cathode of cathode-follower
V2B to the grid of V3 through a protective network.
R1S is a screwdriver adjustable resistor to permit the
preamplifier gain to be adjusted accurately to ten
times. LI and L2 are series peaking coils to improve
high-frequency response.
V3 and V4 form a cathode-coupled gain-control
stage. The signal is applied to the grid of V3 and
coupled through the common unbypassed cathode con
nection to V4 which operates as a grounded-grid
amplifier. The MULTIPLIER switch, SW2, connects
any one of three resistor networks or a short circuit
between the two cathodes to control the stage gain.
In the XI position, the cathodes are connected to
gether and the gain is at a maximum. In the 10-1
position, an adjustable resistor is connected between
cathodes to permit continuous adjustment of gain.
R51 and R53 connected into the circuit in the other
two positions of the switch are screwdriver adjustable
to permit the gain to be adjusted to one-half or to
one-fifth accurately so as to accommodate the gain
tp the calibrations of the graticule. R34 is a protective
resistor which limits the positive excursion of V3 grid
in case a high dc voltage is connected to the input
connector in the dc position of SW1. C14 bypasses
R34 at higher frequencies.
Plate output from V4 feeds through the delay net
work to the grid of V8B, a cathode-follower output-
cupling tube. R59 terminates the delay network
through C21 to ground. (C21 is physically located on
a bracket underneath the delay-network assembly.)
The delay network delays the vertical-deflection sig
nal long enough to permit the portion of the wave
form that has triggered the sweep to be displayed on
the crt screen.
The output amplifier consists of V10 and V I1 in
parallel, in a cathode-coupled grounded-grid phase-
inversion circuit with V12 and V13 in parallel. The
dc grid voltage of V12 and V13 is used for vertical
positioning. This voltage is controlled by V8A, a
cathode-follower voltage regulator whose grid volt
age is obtained from potentiometer R70, labeled
VERT POSITION, connected between ground and
+100 volts. R65 and R66 limit the positioning range.
R90, a part of the coupling between cathodes of
V10, Vll and V12, V13, is a screwdriver adjustable
resistor whose shaft is mounted coaxially with the
AMPLITUDE control knob. This adjustment per
mits the gain of the amplifier to be accommodated to
the calibrations of the graticule.
L3 in the grid circuit and L4, L5, L6, and L7 in the
plate circuit provide frequency compensation.
An internal triggering signal connection from the
plate of V3 to the trigger-selector circuits permits the
sweep circuit to be triggered by the observed signal.
In all other positions of the AMPLITUDE contro
SW1, than the previously-described AC, .01 VOLTS/
DIVISION position, the preamplifier is removed from
the circuit, and the INPUT connector is connected to
the grid of V3, either through attenuators, or unatten
uated. In the AC portion of the control. Cl is con
nected in series with the INPUT connector. The grid
of V4 is grounded in these positions through switch
section SW1D, and V3 and V4 become a cathode-
coupled grounded-grid amplifier.
The compensated input attenuators to the grid of
V3 are voltage dividers in which parallel capacitor and
resistor voltage dividers have the same division ratio.
C3 in the 10-to-l divider and C6 in the 100-to-l di
vider permit adjustment to be made of the capacitive
voltage division so that the high-frequency division
ratio is the same as the low-frequency division ratio.
C2, C5, and CIO are adjustable so that the same
input capacitance will exist at all AMPLITUDE
switch positions. This is necessary when the probe
is used because the probe is compensated for the input
capacitance, and w'ould otherwise need to be re
adjusted for each switch setting. C15 connected be
tween grid of V3 and screen of V4 is a neutralizing
capacitor that reduces the change in input capacitance
that occurs when the MULTIPLIER switch inserts
the various coupling resistors between cathodes of
V3 and V4.
The MULTIPLIER switch, SW2, selects the
amount of coupling between cathodes of V3 and V4 to
determine the gain of the amplifier when the pre
amplifier is switched out. The VERT ATTEN ADJ
is a chassis-mounted screwdriver adjustable potentio
meter connecting the cathodes of V3 and V4 to
—150 volts. This control operates differentially. When
it increases the resistance to the cathode of V3 it simul
taneously decreases the resistance to the cathode of
V4. When it is properly adjusted, the dc voltage at
the two cathodes is the same and no change in vertical
SECTIO N III, PAGE 3
TYPE 315D
positioning occurs when the multiplier switch connects
larger of smaller resistors between them.
Calibrator
The calibrator provides four squarewave voltages
of 100 volts, 10 volts, 1 volt and 0.1 volt, available
at a UHF coaxial fitting on the front panel but not
connected internally to the vertical amplifier. The
source of squarewave voltage is a self-excited sym
metrical ac-coupled multivibrator operating at a repe
tition frequency of about one kilocycle. The cathode
and grids of this multivibrator are returned to
—150 volts.
During the conducting period of V601B, the grid
of V601A is below—150 volts and the A-section plate
is cut off. V602B grid is directly connected to V601A
grid and V602B plate is therefore also cut off during
this period.
During the conducting period of the A section of
V601, grids of V601A and V602B are both high and
the plate of V602B is down below ground potential.
The grid of cathode-follower V602A is directly con
nected to V602B plate, and it therefore varies between
cutoff in the negative direction and a point near
100 volts in the positive direction, determined by volt
age divider R610, R611, R612.
The cathode resistor of cathode-follower V602A is
made up of a voltage-divider string, R620, R621, R622,
R623, which are of such values that voltages of
10 volts, 1 volt and 0.1 volt, peak to peak, are produced
at the taps when the cathode voltage is set at 100 volts,
peak to peak.
R612, a screwdriver adjustment labeled CAL ADJ
on the chassis, permits the grid of V602A to be set at
such a level that the cathode will be at 100 volts when
V602B is cut off. Since this portion of the circuit re
mains connected to the -(-225-volt supply when the
CALIBRATOR switch is turned to the OFF position,
the voltage calibration of the calibrator circuit can be
checked with a dc voltmeter.
C603 in the grid circuit and C604 in the cathode cir
cuit of the cathode follower reduce a small transient
waveform distortion.
Power Supply
The power-supply transformer, T401, is capable of
operating satisfactorily over the range of frequencies
between 50 cps and 800 cps. The primary of this trans
former is wound in two 117-volt sections, normally
paralleled for 117-volt operation, but they are ar
ranged to be easily reconnected in series for 234-volt
operation.
Four selenium full-wave bridge rectifiers, each sup
plied with ac from a separate section of the trans
former secondary, provide dc to four electronic volt
age regulators from which are obtained the regulated
voltages of —150 volts, -(-100 volts, +225 volts and
+350 volts. In addition to these four regulated volt
ages, two unregulated voltage sources are provided,
one at a nominal +330 volts from a tap taken ahead
of the +225-volt regulator, the other at a nominal
+420 volts taken from a tap ahead of the +350-volt
regulator.
The regulator will regulate satisfactorily over a
primary input-voltage range between 105 and 125
volts, or between 210 volts and 250 volts.
Five 6.3-volt secondary windings furnish heater
power for the various parts of the instrument, and for
the pilot light and graticule illumination.
Forced-air cooling is provided by a blower fan. Two
fan types are available. If the Type 315D oscilloscope
is to be used only on 50- to 60-cycle supply voltage,
a 60-cycle fan is recommended, and is ordinarily sup
plied with the instrument. If higher frequencies of
input voltage are to be used, however, a dc fan and
rectifier are available at extra cost which will operate
over the same range of frequencies that the trans
former will.
Negative 15 0 -Volt Regulator
The basic source of reference voltage is a type 5651
voltage-regulator gas diode, V401, in the cathode cir
cuit of V402, a voltage-comparator tube. Voltage-
divider string, R409, R410, R411, connected between
regulated —150 volts and ground, is tapped at a voltage
above —150 volts approximately equal to the voltage
across the reference tube, V401, and connected to the
grid of V402. This sets the cathode and grid of V402
at approximately the same voltage, and any change
in voltage at the —150-volt bus becomes a change in
grid-to-cathode voltage at V402. This change is
amplified in V402 and applied directly to the grids of
V403 and V404, two series-regulator tubes connected
together in parallel in the ground lead of the power
supply. If the —150-volt bus tends to go negative
below this voltage, for example, the cathode of V402
will drop thereby increasing V402 plate current. In
creased plate current will lower V402 plate, which
will pull down the grids of V403 and V404, thereby
increasing their plate resistance, so that they insert
a higher drop in the ground lead, and the —150-volt
bus will rise in the direction to correct the original
TYPE 315D
SECTIO N III, PAGE 4
negative tendency. C404, bypassing R407, R409, and
part of R410, improves the ac gain of the comparator
circuit and reduces ripple. R410 is adjustable by a
screwdriver adjustment labeled 150 V ADJ on the
chassis, so that this voltage can be set accurately.
ioo-Volt Regulator
The + 100-volt supply is regulated by comparing
to ground in comparator-tube V421, a voltage near
ground on voltage-divider R424, R425, connected be
tween —150 volts and the regulated -(-100-volt bus.
The difference voltage is amplified in V421 and ap
plied to the grid of series-regulator tube, V422, con
nected in series with the positive lead. C421 improves
the ac gain and reduces ripple. C420 filters the un
regulated dc input to the regulator, and C422A, one
of three capacitors in one can, filters the regulated
portion.
-|-2 25-Volt Regulator
The -f-225-volt supply is regulated by comparing
to ground potential in comparator tube V441, the volt
age near ground potential on voltage divider R444,
R445, connected between —150 volts and the regu
lated -(-225-volt bus. The difference voltage is ampli
fied in V441 and applied to the grid of series-regulator
tube V442A, connected in series with the +225-volts
bus. Dc input to this regulator is supplied from a
second rectified and filtered but unregulated source
connected in series with the previous source. C440
filters the unregulated input to the regulator. A tap
ahead of the regulator provides a nominal +330 volts,
unregulated. C442B, the second of three capacitors in
one can, filters the regulated supply at +225 volts.
R443, bypassing the series-regulator tube, increases
the available current at the regulated bus. C441 in
creases the regulator ac gain to reduce ripple.
50-Volt Regulator
The +350-volt supply is regulated by comparing
to ground potential the voltage near ground potential
on voltage-divider R467, R468, connected between
—150 volts and the regulated +350-volt bus, in com
parator tube V461. The difference voltage is ampli
fied in V461 and applied to series-regulator tube
V442B in series with the +350-volt bus. Dc input to
this regulator is supplied from a third rectified and
filtered, but unregulated source connected in series
with the previous two sources. C460, in series with
C440 of the previous supply, filters the unregulated
input to the regulator. A tap is taken off ahead of the
regulator at a nominal +420 volts, unregulated.
C422C, the third of three capacitors in one can, filters
the regulated +350-volt bus. R465, bypassing the
series-regulator tube increases the current available
at the regulated bus. C461 increases the regulator ac
gain to reduce ripple.
R412, a front-panel control labeled SCALE ILLUM,
is a variable resistor in series with the graticule illumi
nating lights which permits the brightness of the
graticule illumination to be varied.
High-Voltage and Cathode-Ray Tube Circuits
Accelerating voltage of about —1500 volts is ap
plied to the cathode of the cathode-ray tube. This high
voltage is obtained by rectifying a 50- to 60-kilocycle
high-voltage alternating current supplied by an oxide-
core transformer whose primary forms the inductor
of an inductance-capacitance oscillator. The primary
inductance is center tapped so that it can be used in
a Hartley oscillator. C804 is the tank capacitor and
V803 is the oscillator tube. Plate power is fed by way
of the center tap on the inductor at a nominal
+350 volts from the unregulated side of the regulated
+225-volt supply. V804 in the negative lead of the
high-voltage winding is the rectifier supplying dc to
the crt cathode. The rectifier filaments are supplied
from additional windings on the same transformer.
The positive end of the transformer winding is con
nected to regulated +225 volts. Filtering is provided
by C815 connected to ground from V804 plate,, and
by C816 and C817 in series, also between V804 and
ground.
A voltage-divider string of resistors, R902, R903,
R904, R817, and R816 connected between the rectifier
plate and regulated +350 volts provides voltage taps
for the focusing grid and for a sample of the high
voltage for use in the high-voltage regulator system.
R903 of the resistor string is a front-panel control
potentiometer labeled FOCUS which permits the volt
age of the focusing grid to be adjusted for best focus.
R817 in the resistor string is a screwdriver-adjust
able potentiometer, the arm of which is at about
—150 volts. The voltage from the arm is compared to
—150 volts in comparator tube V801A. The plate of
V801A is connected to +350 volts through a very
high resistance load, R802, and sits near ground po
tential. The grid of V801B is connected directly to
the plate of V801A, and the plate of V801B is con
nected directly to the screen of oscillator-tube V803
and through plate-load resistor R803, to regulated
+225 volts. Any departure of the voltage tap on R817
of the high-voltage resistor string is therefore first
amplified in comparator tube V801A and again in
V801B so as to change the screen voltage of V803.
For example, if the oscillator voltage becomes too
high, the grid voltage of V801A will drop, its plate
@
SECTION III, PAGE 5
TYPE 315D
will rise carrying V801B grid up with it. Plate cur
rent in V801B will increase, its plate will drop carry
ing the screen of oscillator V803 down with it, thereby
reducing the gain of this tube so that the oscillation
amplitude will drop.
Unblanking
A second high-voltage winding and rectifier supply
the control grid of the cathode-ray tube at about
—1600 volts. V805 is the rectifier and C818 is the filter
capacitor. R910, in a voltage-divider resistor string
across the high voltage is adjustable by means of a
front-panel control labeled INTENSITY to permit
adjustment of the spot intensity.
The positive end of this supply is connected to the
unblanking-output tube, V210A, through R914. Thus
the whole control-grid voltage supply including the
transformer winding is raised and lowered in voltage
by the unblanking pulse. This arrangement provides
dc coupling of the unblanking waveform to the con
trol grid, thereby making it possible to use as slow a
sweep as desired. R914 and C902 improve the rise
time of the pulse appearing at the control grid.
The astigmatism control, labeled ASTIG on the
front panel is a potentiometer, R920, connected be
tween regulated +225 volts and regulated +100 volts.
An external cathode connection is provided via C901
for introducing external z-axis signals to provide
beam-intensity modulation if desired. R905 prevents
dc, which might leak through the dielectric of C901,
from developing high voltage at the connector.
Components shown on the right of the broken line
in the diagram are located on a horizontal bakelite
mounting board above the end of the cathode-ray tube.
The transformer, rectifier tubes, and filter capacitors
shown on the diagram to the left of the broken line,
are mounted inside a shield at the left lower rear cor
ner to the left of the power transformer.
TYPE 315D
SECTIO N H I. PAGE 6
SECTION IV
Maintenance and Adjustment
Filter Maintenance
Care must be taken to assure free ventilation of the
instrument inasmuch as some of the components are
operated at dissipation levels such that excessive tem
peratures will result without adequate air circulation.
Washable Lumaloy Air Filters are used at the air
intake ports of the instrument. The following filter
cleaning instructions are given by the filter manu
facturer.
“To Clean:
(1) If grease or dirt load is light, remove filter front
installation and flush dirt or grease out of filter
zvith a stream of hot water or steam.
(2 ) If load is too heavy for treatment in (1) above,
prepare mild soap or detergent solution (see
paragraph below on use of caustics) in pan or
sink deep enough to cover filter when laid flat.
Agitate filter up and down in this solution until
grease or dirt is loosened and carried off filter.
(3) Rinse filter and let dry.
(4) Dip or spray filter with fresh Filter Coat, or
other approved adhesive. Filter Coat is avail
able from the local representative of RE
SEARCH PRODUCTS CORP. in the one-pint
Handi-Koter with spray attachment or one-gal
lon and five-gallon containers.
In most cases hot water, steam, or hot water and
mild soap solution (Ivory, Dr eft, Vel, etc.) is all
that is needed to restore the dirt or grease laden filter
to its original sparkling lustre. However, where ex
treme conditions are encountered with higher-than-
average dirt or grease loads or where maintenance
of the filters has been neglected, allowing an accumu
lation of hard grease or caked dirt, more compre
hensive cleaning steps may be taken.
CAUTION: IN CASES OF THIS KIND,
USE OF CAUSTICS WITHOUT RECOM
MENDED INHIBITORS ADDED IS DAM
AGING TO THE FILTER.
(For information on correct procedure, write the
Research Products Corporation stating name of
cleaning agent and concentration.) Certain nation
ally known and nationally distributed cleaners are
approved for use in dish-washers, cleaning tatfks or
filter service company equipment. Following is a
partial alphabetical list of cleaners already tested and
approved by Research Products Corporation:
CLEANER
Calgonite
K O L
Oakite Composition
No. 63
Pan Dandy
Super Soilax
Wyandotte Keego
MAKER
Calgon, Inc.
DuBois Company
Oakite Products, Inc.
Economics Lab., Inc.
Economics Lab., Inc.
Wyandotte Chem. Corp.
Non-inclusion of any other cleaners is not intended
to indicate their being unacceptable. For specific in
formation on other products, write the Research
Products Corporation, Madison 10, Wisconsin.’’
Replacement of Components
Most of the components used in the construction of
TEKTRONIX instruments are standard parts obtain
able from any well-equipped parts distributor. Some
of the components carrying 1% and 2 % tolerances
may not be so readily obtainable but may be pur
chased from the manufacturer at these tolerances. The
remainder of the low-tolerance components are
standard 1 0 %- and 20%-tolerance parts that are
checked at the factory for proper value or performance.
Replacement parts are available on order from the
factory at current net prices but in the case of standard
parts it is probably more economical of time to pur
chase them locally. It is not feasible to attempt to
check out low-tolerance parts or matched pairs with
out a reasonably large stock to choose from as the
rejection percentage is quite high in many cases.
IMPORTANT: It is imperative that you
get parts-ordering information from the in
struction book prepared specifically for the
instrument involved. The serial number of
the instruction book must agree with the
serial number of the instrument.
A TEKTRONIX instruction manual will usually
contain hand-made changes of diagrams, parts lists,
and text, appropriate only to the instrument it was
prepared for. There are good reasons why this is true.
First, TEKTRONIX engineers are continually
working to improve TEKTRONIX instruments.
When the improved circuitry is developed or when
better components become available, they are put into
SECTIO N IV, PAGE 1
TYPE 315D
TEKTRONIX instruments as soon as possible. As a
results of constant improvement TEKTRONIX in
struments are always built as good as we can build
them, but the changes caused by these improvements
must frequently be entered by hand into the manual.
Second, when- TEKTRONIX instruments go
through our exhaustive test procedure, TEKTRONIX
technicians adjust them individually to obtain opti
mum operation. This kind of hand tailoring occasion
ally requires substitution of components differing from
the nominal values printed in the manuals.
Third, because of procurement difficulties, equiva
lent but different parts are sometimes used. Usually
such parts are directly interchangeable with those
originally specified. No alternate parts have been
used which adversely affected the instrument, and you
were able to receive your instrument much earlier
than you might have otherwise.
To assure that you will receive the correct replace
ment parts with the minimum of delay it is therefore
important that you include the instrument serial num
ber with your order, along with the instrument type
and part numbers, of course. And as a further pre
caution, get ordering information from the instruction
manual whose serial number agrees with the in
strument.
Equivalent parts, supplied by the factory when the
exact replacement parts ordered are not available, will
be accompanied by an explanation and will be directly
interchangeable in most cases.
CAUTION: Use only silver-bearing solder
on the ceramic terminal strips and for tin
ning the soldering iron, if it becomes neces
sary to resolder.
The slots in the ceramic terminals are
filled with solder containing 3 per cent of
silver which is bonded to a film of pure silver
fused with the porcelain glaze. Ordinary tin-
lead solder absorbs the silver from the fused
film to the extent that a bond can no longer
be formed between the solder and the porce
lain after only a few resoldering operations.
Silver-bearing solder is used in printed- and
etched-circuit techniques and is therefore
readily available from all principal solder
manufacturers. A length of three-per cent
silver solder included with the instrument
will be found mounted on the left side of the
chassis.
Removal of the Case
Set the oscilloscope face downward on a padded
flat surface, turn the two fasteners on the back ap
proximately % turn to the left, and lift off the case.
The power cord is not removable so it must be fed
through the hole as the cabinet is removed.
CAUTION: Voltages high enough to be
dangerous are present in this instrument.
Since much maintenance must necessarily be
performed with the case removed, great care
should be taken to avoid contact with bare
leads. Use only insulated tools, stand on a
dry floor, and if possible, keep one hand in
your pocket.
Power Supply
Line Voltage
The power supply of the Type 315D Oscilloscope
will operate satisfactorily over the voltage ranges 105
to 125 volts and 210 to 250 volts.
The power transformer is wound with two 117-volt
primaries. When the instrument leaves the factory,
the primaries are ordinarily connected in parallel for
117-volt operation. If operation from 234-volt lines
is desired, remove the jumpers on the power trans
former between terminal 1 and terminal 2, and be
tween terminal 3 and terminal 4. Now connect termi
nals 2 and 3 together. With the line still connected
to terminals 1 and 4, the instrument is ready for
234-volt operation.
The fuse normally supplied when the Type 315D
is wired for 117-volt operation is 5-amp, 250-volt “Slo
Bio”. For proper protection on 234-volt operation,
this fuse should be changed to 2l/ 2-amp, 250-volt
“Slo Bio”.
Line Frequency
The Type 315D is supplied in two different models,
for universal line frequency 50 to 800 cycles, or for
50- to 60-cycle operation. The only difference be
tween these models is in the fan motor supplied. The
universal 50-800-cycle model uses a dc series-wound
motor with a full-wave selenium bridge rectifier. A
37j/£-volt winding on the power transformer supplies
the power to the rectifier. (NOTE: A few of the
early instruments did not have this winding but rather
used a half-wave rectifier and a series resistor con
nected directly to the 117-volt line.)
Change of Fan Motor
The 60-cycle model uses a standard 60-cycle shaded-
pole 117-volt motor. This motor, having no brushes,
will run quieter and the life should be longer than
the dc model. This motor is recommended where the
universal feature is not needed. The mounting plates
are identical on the two motors so it is possible to
TYPE 315D
SECTION IV, PAGE 2
change from one to the other if the need should arise.
If wired for the 60-cycle motor, the motor wires (grey)
should go to terminals 1 and 3. If wired for universal
line frequency, the wires should go to terminals 14
and 17. A name plate on the back of the instrument
indicates the line frequency. This plate should be
changed if the motor is changed.
Dc Voltages
All dc voltages are regulated and are referred to the
—150-volt supply. In order for the instrument to per
form properly, it is necessary for the minus 150-volt
supply to be within plus or minus 2% of this
value. The voltage should be checked with an accu
rate voltmeter and corrected if necessary by adjusting
potentiometer R410 marked ADJUST —150V (screw
driver adjust), located on the center bulkhead. This
check should always be made if the 5651 tube V401
is changed.
High Voltage
The calibration of the TIME BASE and VERTI
CAL AMPLITUDE controls are dependent on the
acceleration voltage applied to the cathode-ray tube.
If it is suspected that the calibrations are off, the high-
voltage supply should be checked with an accurate
meter of at least 20,000 ohms-per-volt sensitivity. The
supply voltage should be adjusted to—1800 volts from
the cathode (pin 3) of the CRT to ground by means of
the potentiometer R817 marked H.V. ADJUST. If
more convenient, this reading may be made from the
plate of V804 (heavy green lead) to ground. V804 is
the lower rectifier tube located under the shield.
Calibrator
Before adjustments are made on the vertical ampli
fier, it is well to check the output adjustment of the
calibrator. Inasmuch as the clipper, cathode-follower
V602A, remains conducting even with the CALI
BRATOR switch in the OFF position, it is possible
to adjust the voltage accurately with a dc voltmeter.
An accurate voltmeter of at least 1000 ohms-per-volt
sensitivity should be connected to the cathode (pin 3)
of V602A. (This is the yellow lead going to the back
of the CALIBRATOR switch.) The switch should
be turned to the OFF position and R612 (screwdriver
potentiometer marked CAL ADJ on the main bulk
head) adjusted to a reading of +100 volts. The cali
bration voltage will then be accurate on all settings.
Vertical Amplifier
NOTE:A warm-up period of approximatel
15 minutes to stabilize the characteristic
should precede adjustments of the vertica
amplifier. Also best results will be obtained
if the adjustments are made in the following
order:
Amplifier Gain Adjustment
Set the AMPLITUDE selector switch to the dc
position, .1 VOLT/DIV. Set the MULTIPLIER to
1; set the CALIBRATOR to 1. Connect a lead be
tween CAL OUTPUT and INPUT, with the STA
BILITY control advanced so the time base is free run
ning. Adjust the VERT POSITION control until the
bottom of the display coincides with the lowest small
mark on the graticule. Then adjust R90 (screwdriver
adjustment in center of AMPLITUDE knob) until
the top of the display coincides with the top small
mark on the graticule (10 division). The CALI
BRATOR voltage should be set to .1 and the display
should occupy one scale division at any setting of
the VERT POSITION control.
iX MULTIPLIER Adjustment
The CALIBRATOR should again be set to 1 volt
and the MULTIPLIER set to 2. R51 (located on the
outside of the bracket supporting the MULTIPLIER
switch) is adjusted to give a display of 5 divisions.
$X MULTIPLIER Adjustment
Next set the MULTIPLIER switch to 5, adjust R53
(located on the inside of the bracket) to give a display
of 2 divisions. With the MULTIPLIER switch in the
10-1 (red) position, a full rotation of the center (red)
knob will now give a display of 10 divisions in the
full-clockwise position and approximately 1 division
in the counter-clockwise position.
Attenuator Adjustment
Now turn the CALIBRATOR to OFF and position
the trace to the center of the screen. As the red knob
(10-1) on the MULTIPLIER is rotated, there should
be no change in position. If there is a change in posi
tion, R55, VERT ATTEN ADJ (located on side of
vertical amplifier chassis) should be adjusted until
there is no change in position as the red knob is
rotated.
NOTE: This adjustment as well as the
PRE AMP GAIN ADJ may require an occa
sional touching up as the tubes age. There
fore holes have been provided in the sides of
the cabinet to allow access to these controls,
PREAMP GAIN Adjustment
Set the CALIBRATOR to .1 volt, set the AMPLI
TUDE to .01 VOLTS/DIVISION, MULTIPLIER
to 2. Adjust R15, labeled PRE AMP GAIN ADJ,
located on side of vertical amplifier chassis, to give
a display of 5 scale divisions.
SECTION IV, PAGE 3
TYPE 315D
Input Attenuator and Probe
The various input attenuators in the Type 31SD are
of the resistor-capacitor type. The resistor divider
ratio is equal to the capacitor divider ratio, and there
fore the voltage division is constant for any frequency
from dc to well above the requirements of the instru
ment. Adjustments of these attenuators is readily
made while observing their square-wave response.
The self-contained calibrator in the Type 315D is a
suitable square-wave source, and thus a check of the
attenuators is always available. When the variable
capacitors in the attenuators are properly adjusted, a
square wave will be correctly reproduced by the oscil
loscope. If the capacitive divider has a lower attenu
ation than the resistive divider, a spike will appear on
the leading edge of the square wave. If the capacitive
divider has a higher attenuation, the corner of the lead
ing edge will be rounded. The following adjustment
procedure is recommended:
Shield
1. Lay a sheet of metal on the top of the in
strument to simulate the presence of the case.
C3 Adjust
2. Set the CALIBRATOR to 10 volts. Set the
AMPLITUDE to AC, 1 VOLT/DIV and the
MULTIPLIER to 2. With the TRIGGER SE
LECTOR set to +IN T, SLOW RISE, adjust
the TIME BASE to display 8 to 10 cycles of the
CAL waveform across the screen. Adjust C3, the
rear trimmer, on the side of the switch.
C15 Adjust
3. Turn the MULTIPLIER to the 10-1 posi
tion (red), set the center knob full counter-clock
wise, and set the CALIBRATOR to 100 volts.
Adjust C15, located on the chassis just in
the rear of the MULTIPLIER switch, until no
overshoot is observed. (NOTE: It may be
necessary to repeat step 2 after this adjustment
as there is some interaction.)
C6 Adjust
4. Set the AMPLITUDE to AC, 10 VOLTS/
DIV, set the MULTIPLIER to 2, set the CALI
BRATOR to 100. Adjust C6 (located on the rear
of the switch, and adjusted through the hole in
the chassis.)
Probe Adjust (C101)
5. Remove the wire connecting CAL OUT and
INPUT, and connect the probe, place the tip of
the probe in CAL OUT. Set AMPLITUDE to
.1 VOLT/DIV, MULTIPLIER on 2, and set the
CALIBRATOR on 10. Adjust C101, located on
the probe body.
C2 Adjust
6. Set AMPLITUDE to 1 VOLT/DIV,
MULTIPLIER on 2. Set CALIBRATOR to
100 volts. Adjust C2, located on the side of
AMPLITUDE switch.
C5 Adjust
7. Set AMPLITUDE to 10 VOLTS/DIV,
MULTIPLIER on 1, with the CALIBRATOR
at 100 volts. Adjust C5, located on the front of
the AMPLITUDE switch, through the hole on
the chassis.
Cro Adjust
8. Set the AMPLITUDE to .01 VOLTS/DIV,
MULTIPLIER on 2, with the CALIBRATOR
on 1 volt. Adjust CIO, located near VI on the
front of the vertical amplifier chassis.
High-Frequency Compensation
The following describes the adjustment procedure
for high-frequency compensation in the Type 315D.
The adjustments are not extremely critical. However,
they do require considerable care to obtain optimum
results. Also since once adjusted, they are fairly
stable, readjustment should not be attempted with
out first eliminating other possible sources of wave
form distortion, including defective tubes or a defi
cient signal source. A suitable square-wave generator
or pulser is necessary in making any high-frequency
adjustments of the Type 315D. The square-wave gen
erator rise time must not exceed .04 microseconds. A
TEKTRONIX Type 104A or Type 105 Square-wave
Generator will provide a suitable signal. All connec
tions between the generator and the oscilloscope
should be coaxial type and MUST be properly termi
nated, preferably at both ends of the cable.
Disconnect Delay Network
1. In the Type 315D, the DELAY NETWORK
must be disconnected before any adjustments are
made on the vertical amplifier. This can be done as
follows:
Disconnect the red lead (delay line input) from
pin 6 (plate) of V4.
Disconnect the purple lead (delay line output)
from pin 7 (grid) of V8B.
Connect a jumper from pin 6 of V4 to pin 7 of
V8B. This lead should be no longer than neces
sary and should be kept well away from the
chassis.
Connect a 1000-ohm, 1-watt, resistor from pin 7
of V8B to the +100-volt bus. The + 100-volt
bus is located on the terminal of C21, which is
on the bracket below the delay network.
TYPE 315D
SECTIO N IV, PAGE 4
Amplitude of Test Signal
2. Apply a square wave of 750 kc to 1 me to the
input of the Type 315 oscilloscope. Adjust the ampli
tude of the square wave so that it causes a deflection
of 5 to 6 divisions with the AMPLITUDE set on
.1 VOLTS/DIV and the MULTIPLIER on 1 or 2.
3. Adjust the TIME BASE to display 3 or 4 cycles
of the square wave.
Compensating Coil Adjustments
4. Observe the leading edge of the square wave.
Adjust L3, L4, L5, L6, and L7, if necessary, for the
best waveform with the least overshoot on the leading
edge of the wave. All of these adjustments interact
to some extent so only a small adjustment should be
made to any one coil at a time. NOTE: If the above
steps are properly made, the waveform should look
very good at this point. However, there may be a few
remaining small wrinkles. This should not cause con
cern as they will disappear when the delay line is
re-installed.
Preamp. Adjust
5. Insert a 10-to-l pad in the signal lead from the
generator, or reduce its output sufficiently that it will
not overload the preamplifier. Set the AMPLITUDE
to .01 VOLT/DIV, adjust LI and L2 for best wave
form. NOTE: These adjustments are not very critical
and it may require a large change in inductance to
show any change in waveform. The two coils should
be adjusted so that the slugs are both in about the
same position.
6. The delay network should be reconnected.
Delay Network
The delay network is a 19-section, M-derived, arti
ficial transmission line providing a signal delay of
.25 microsecond. An accurate impedance match be
tween sections must be maintained to prevent reflec
tions. Each section is adjusted by means of a variable
capacitor (C501 to C522). The effects of these ad
justments are distributed over the first .5 microsecond
of the signal.
CAUTION: Adjustment of the delay net
work should not be attempted without first
verifying normal transient response of the
output amplifier as explained under “HIGH-
FREQUENCY COMPENSATION”. Oth
erwise the delay network adjustments may
be set to compensate for deficiencies in the
output stage. This will cause a loss in over
all bandwidth of the instrument. The follow
ing methods of adjustment will give satis
factory results:
Delay Network Test Signal
1. Apply a 100-kc square wave to the input of
the oscilloscope with the AMPLITUDE set on
.1 VOLTS/DIV. Set the TIME BASE to 1 MICRO-
SECOND/DIVISION.
2. Adjust the DELAY NETWORK trimmers
(C501 to C522) for the smallest ripple or irregularity
on the first .5 microsecond of the square wave. The
position of the irregularity determines which capacitor
needs to be adjusted. Try adjusting one of the center
capacitors to see where it produces its effect.
Leading Edge
3. Change the TIME BASE to 5 or 10 MICRO-
SECONDS/DIVISION and observe the squareness
of the leading corner. If the corner (first .5 microsec)
ond is higher in amplitude than the remainder of the
square wave, repeat step 2, but setting all the capaci
tors at a higher capacitance. If lower, repeat using
lower capacitor settings. It may be found that only
part of the corner will slope up or down. In this case,
only part of the capacitors will need to be increased or
decreased.
Delay Network Terminating Resistor^
If a square corner cannot thus be obtained, an in
correct termination resistor, R59 is indicated. To
check this termination, turn off the 315D and allow
the tubes to cool. Then measure R59 between pin 7
of V8B and the +100-volt bus (located on terminal
of capacitor C21) with an accurate bridge. If outside
the range of 1100 ohms ±1%, replace with a composi
tion resistor selected to be within these limits. (R59
is located in the delay-network chassis, which must
be removed to replace the resistor.)
Astigmatism
For best focus of both horizontal and vertical lines,
the final anode of the cathode-ray tube must be re
turned to a voltage approximately equal to the dc
voltage on the deflection plates. A preliminary set
ting of the ASTIGMATISM control (R920), located
on the back plate of the instrument, may be made by
connecting a voltmeter between ground and the center
arm of this control, and adjusting to +190 volts. Be
cause of variations in individual cathode-ray tubes,
the best setting may differ slightly from this value,
so final adjustment should be made while a signal is
being observed. The optimum setting will give equally
good focus of both horizontal and vertical lines. This
should be made while a sine wave or a square wave
SECTION IV, PAGE 5
TYPE 3I5D
is being observed. This setting should be made simul
taneously with the front-panel FOCUS control be
cause these controls interact to some extent.
Time Base
A complete procedure for the adjustment and cali
bration of the time base is outlined here. However, in
normal servicing, only necessary adjustments should
be made.
Timing Series Capacitors
If it is ever necessary to replace one of the timing-
series capacitors (C280A, C280B, C280C^ C280D) it
is suggested that all four capacitors be obtained from
TEKTRONIX, INC., and be replaced as a group.
When ordering replacement parts be sure to men
tion instrument type and serial number.
The timing series consists of one group of four ca
pacitors arbitrarily chosen from the six possible series
shown below.
Nominal
Value
Series
7-K
Series
7-L
Series
7-M
Series
7-N
Series
7-P
Series
7-Q
.96
.97 .98
.99
1.0 1.01
.097 .098
.099
.10 .101
.102
.Olpi .0097
.0098
.0099
.01
.0101 .0102
lOOO^f
970
980 990
1000
1010 1020
The values shown are minimum with a tolerance of
—oto+1%-
Multivibrator Stability
1. Set STABILITY control (red coaxial knob) full
clockwise. Adjust MULTI STABILITY (R254,
screwdriver potentiometer on side of sweep deck)
about half way between the points where the sweep
stops on the left of the screen and where it stops on
the right of the screen. NOTE: It may not be possible
to make it stop on both sides. If not, adjust it to
where it stops on one side or the other, then back it
off approximately turn.
Sweep Length
2. With the sweep free running at 1 MILLI-
SEC/DIVISION adjust SWEEP LENGTH (R261,
screwdriver adjustment on side of sweep deck) until
the sweep just covers the ruled portion of the graticule
(approximately 10)4 division).
Trigger Sensitivity
3. Set the TRIGGER SELECTOR to -(-LINE or
—LINE. Set the time base RANGE to 10 MICRO-
SECONDS/DIVISION. Set the TIME BASE MUL
TIPLIER to 1. Set the VERTICAL AMPLIFIER
AMPLITUDE to .1 VOLT/DIVISION, MULTI
PLIER bn 1. Advance the STABILITY control (red
knob) until a trace appears. Now turn the STABIL
ITY control back (counter-clockwise) until the trace
disappears, or drops suddenly in intensity. If the trace
disappears, adjust the TRIGGER AMPLITUDE
DISCRIMINATOR until a dim trace is displayed.
The time base is now triggered by the ac line fre
quency. Connect, the 10X probe cable to the INPUT
and touch the probe to the cathode of V203 (pin 3
and 8). This lead appears at the terminal of the 18-k,‘
2-watt resistor (R232) located on the terminal board
just back of the TRIGGER SELECTOR switch on
the underside of the sweep chassis. Adjust TRIG
SENS (R223, screwdriver control, located on side of
the sweep chassis) until a series of oscillations are
observed on the trace, then back off the control to
the point where the oscillations just disappear.
V 201 Balance
4. Set the TRIGGER AMPLITUDE DISCRIMI
NATOR to 0 (center), and set the STABILITY con
trol full counterclockwise. Connect a dc voltmeter
between ground and the grid of the pentode section
of V202, pin 2, and rotate the TRIGGER SELECTOR
switch from the -(-EXT to the.—EXT positions. The
voltages in the two switch positions should be nearly
equal at 190 volts. If there is a difference of over five
volts it indicates either that the phase-inverter tube,
V201, is not balanced, or that the plate resistors for
this tube are not equal. V201 should be exchanged if
necessary for a tube which gives as nearly equal volt
age as obtainable with the switch in the two positions,
and the resistors, R208 and R209, should be checked.
Internal-Trigger DC Level
5. With the controls set as in step 4, rotate the
TRIGGER SELECTOR switch from —INT to
-(-INT, and if necessary, adjust R202 (a screwdriver
adjustment on side of TRIGGER SELECTOR
switch) until the average of the two voltages is the
same as the average voltage measured in step 4.
A. Set the AMPLITUDE selector to one of the
AC positions. Connect a wire between INPUT and
CAL OUTPUT. Set the CALIBRATOR and the
AMPLITUDE control so that a vertical deflection
of approximately 0.2 division is displayed. Set TRIG
GER SELECTOR to +INT or —INT, SLOW RISE.
Set the STABILITY control just below the point
where the sweep free runs. Set the TRIGGER
AMPLITUDE DISCRIMINATOR to 0 (center).
Adjust INT TRIG DC LEVEL (R202, screwdriver
adjustment on side of TRIGGER SELECTOR
switch) until the point of triggering occurs as close
as possible to the zero setting of the TRIGGER
TYPE 31SD
SECTION IV PAGE 6
AMPLITUDE DISCRIMINATOR. This point
should be checked on both +IN T and —INT set
tings of the TRIGGER SELECTOR. When a proper
adjustment is made, the point of triggering will be
at about the same rotation from zero with either posi
tive or negative settings.
NOTE: For the following step and for all
time-base calibration adjustments, either a
suitable time-mark generator or an accu
rately calibrated oscillator is required. A
suitable instrument is the TEKTRONIX
TYPE 180 TIME-MARK GENERATOR.
V213 Check (Constant-Current Tube)
6. Set the marker generator for one-microsecond
marks. Set the TIME BASE to 1 MICROSEC/DIVI-
SION, and the MULTIPLIER to 1. Display a stable
trace of the time marks, and watch the trace as you
short out R279 (15-ohm resistor in heater lead to
V213A, located on bakelite board on back of sweep
chassis). Keep R279 shorted for at least 30 seconds.
If any change occurs in the time base replace the
constant-current tube, V213. A tube should be se
lected for this position which shows no change as the
heater voltage is changed. A tube with low emission
or with high heater-to-cathode leakage is unsatisfac
tory in this position. High heater-to-cathode leakage
in this tube will cause an error in the timing of the
5 SEC/DIVISION range. If this trouble is suspected,
its presence can be checked by setting the RANGE
switch to 1 SEC/DIVISION and MULTIPLIER to
5, and advance the STABILITY control to get a
recurrent sweep. Time the full 10-centimeter transit
time first with the line voltage near 105 volts and
second with the line voltage increase to the vicinity
of 125 volts. Any difference in the timing with a
change in line voltage indicates cathode-to-heater
leakage in the constant-current tube.
Time Base Calibration
7. Set the TIME BASE RANGE on 1 MILLI-
SECOND/DIVISION. Connect the time-mark gen
erator to the vertical INPUT and select time marks
of 1 millisecond. Adjust SWEEP CAL (R286, screw
driver adjust on side of sweep chassis) until 10 marks
correspond with 10 scale divisions.
Magnifier Gain
8. With the time marks and TIME BASE set as
in step 7, turn the 5X MAGNIFIER (red knob center
of RANGE switch) to the ON position (clockwise
rotation). The HORIZ POSITION should be set so
that the center 20 per cent of the display is on the
screen of the tube. Adjust MAG GAINV(R314, screw
driver adjustment on side of sweep chassis) until 2
time marks correspond with 10 scale divisions. A
more accurate adjustment may be obtained if the
generator is set to 100 MICROSECONDS. Then 20
time marks will occupy 10 divisions. The linearity
of the sweep should be carefully checked by noting
if each time mark corresponds with a graticule divi
sion. If there is any indication that the sweep is not
linear, the horizontal output tubes (V224 and V223)
should be changed.
Mag. Centering
9. With the same setup as in step 7, position the
trace to the right with the HORIZ POSITION con
trol, until the second time mark as displayed on the
screen is centered over the center line of the graticule
(magnified sweep). Now turn the 5X MAGNIFIER
switch to OFF (counter clockwise) and reposition the
trace with MAG CENTERING (R306, screwdriver
adjust, on side of sweep chassis) until the second time
mark is centered on the screen. When this adjustment
has been properly made, there will be no movement
of the display in the center of the screen as the 5X
MAGNIFIER is switched on or off. In other words,
the trace will be magnified equally in both directions
from center.
NOTE: At this point is recommended that
all time-base ranges slower than 1 MILLI-
SEC/DIVI'SION be checked in each of the
three MULTIPLIER positions. There should
be no error greater than two per cent ex
cept at 1, 2, and 5 SEC/DIVISION settings,
where the error should not exceed four per
cent. Any greater error indicates defective
timing resistors or capacitors, or, in the case
of the slowest time bases, heater-to-cathode
leakage in V213A excessive.
Preliminary Adjustment for High-Speed Trace Linearity
10. If the linearity of the time base has deteriorated,
trimmers C260, C276, C290 and C303, located on the
underside of the sweep deck should be adjusted for
best linearity first before the timing of the 10, 1, or
0.1 MICROSEC/DIVISION time bases is adjusted.
If the linearity is good, step 10 may not be necessary.
If the linearity needs to be corrected, preset the trim
mers as follows:
C276, minimum capacitance
C303, minimum capacitance
C260, half capacitance
C290, half capacitance
®
SECTIO N IV, PAGE 7
TYPE 3I5D
Then the following procedure should be followed in
the sequence listed:
A. Set the TIME BASE RANGE to 10 MICRO-
SEC/DIVISION, MULTIPLIER to 1, and dis
play 10-microsecond time marks. Adjust C290 for
best linearity of the first half of the time base.
B. Make a preliminary adjustment of C280E (lower
capacitor on bracket on top of side of chassis) so
that 10 markers correspond with 10 graticule
divisions.
C. Change the RANGE control setting to .1 MICRO-
SEC/DIVISION and the MULTIPLIER setting
to 5. Display a five-megacycle sine wave and ad
just C276 for best linearity of the first half of the
sweep.
D. Reduce the MULTIPLIER control to 1, and ad
vance C250 until the end of the trace just starts
to fold over, and then back it off until no fold-
over occurs and the linearity of the last of the
trace is best.
E. Advance the MULTIPLIER dial to 2, and adjust
C303 for best linearity of the start of the trace.
H igh-Frequency Timing
C2 90 Adjust
11. Set the RANGE to 1 MICROSEC/DIVISION,
the MULTIPLIER to 5, and turn the 5X MAGNI
FIER to ON. Set the marker generator to give
5-microsecond marks. With the HORIZ POSITION
control, position the display so that the first of the
sweep is observed. Adjust C290 so that the first two
markers occupy 10.1 graticule division.
C280E Adjust
12. With RANGE set to 1 MICROSEC/DIVI
SION set the MULTIPLIER to XI, and turn the
5X MAGNIFIER to OFF. Set the marker generator
to give one-microsecond marks and adjust C280E (lo
cated on bracket on tube-side of sweep chassis, lower
capacitor nearest switch) so that 10 time marks cor
respond with 10 scale divisions.
C29 0 Readjust
13. With the RANGE set to 1 MICROSEC/DIVI
SION, set the MULTIPLIER to 5X and set the
marker generator for five-microsecond marks. Ob
serve the linearity of the sweep. Readjust C290, if
necessary, so that each time mark has the same spac
ing, without regard to timing. If much adjustment
is necessary, step 12 should be repeated.
NOTE: With the RANGE set to 1 MICRO
SEC/DIVISION the timing accuracy should
be checked at the X2 and X5 MULTIPLIER
settings. Any error greater than 2% indicates
resistors R282A or R282B are defective. If
there is any discrepancy it should be aver
aged between the settings by a compromise
setting of C280E. Do not confuse timing
error with non-linearity of the sweep.
C28 0G Adjust (preliminary)
14. Set the RANGE to .1 MICROSEC/DIVI
SION, set the MULTIPLIER to 5 and set the marker
generator for 1-^sec marks. Adjust C280G so that 5
marks correspond with 10 scale divisions.
C276 Adjust
15. With the same settings as in step 14, change
the marker generator to 5 me, and adjust C276, if
necessary, for the best linearity at the start of the
sweep.
C28 0G Adjust
16. With the same settings as in step 15, change
the marker generator for 1-^sec marks and readjust
C280G, if nece'ssary, so that 5 marks correspond with
10 scale divisions.
Adjust
17. With the same settings as in step 16 change
the MULTIPLIER to XI and set marker generator
to 10 me. Adjust C303 if necessary so that the center
8 scale divisions correspond with 8 sine waves. Dis
regard the first and the last marks as there may be a
small error if they are used. It may be necessary to
repeat step 16 after this adjustment is made. The tim
ing should now be checked in all positions of the
MULTIPLIER switch and if any error is found it
indicates that the sweep-linearity-setting capacitors
C303, C276 or C260, are not properly adjusted.
TYPE 315D
SECTION IV, PAGE 8
I
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DIAGRAMS
Front Panel..............................
.........................
Trigger Selector and Shaper
.........................
Time Base
.......................................................
Range and Multiplier Switch Detail
..............
Preamp ••••■••«••••••••••••••••••••••••
Vertical Amplifier
...........................................
Calibrator
.........................................................
Power Supply
High Voltage and CRT Circuits......................
. Page 1
. Page 2
.. Page 2
.. Page 2
.. Page 3
.. Page 4
. Page 5
,. Page 5
.. Page 5
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TYPE 315 D CATHODE-RAY OSCILLOSCOPE
TIME BASE
MULTIPLIER
5X MA GNIFIE R
RA NGE
5 2
SERIAL
TIME/DIVISION
CALIBRATOR
VOITS, PEAK TO PEAK
TRIGGER AMPLITUDE
DISCRIMIN ATOR
-1 0 0 4 1 0
CAL. O UT
G N D .
TEKTRONIX, INC ., PORTLAND, O R EGON, U. S. A.
ABBREVIATIONS
Cer.
ceramic m milli or 10'3
Comp.
composition
0
ohm
EMC
electrolytic, metal cased
PMC
paper, metal cased
f
farad Poly.
polystyrene
GMV
guaranteed minimum value Prec. precision
h
henry
PT
paper tubular
k
kilohm or 103 ohms
V working volts dc
meg
megohm or 106 ohms
Var.
variable
micro or 10"6
w watt
Hfi
micromicro or 10*12
WW wire wound
CALIBRATOR
Capacitors
C601
220 fifii
Mica
Fixed
500 v
20%
C602
220 fifii
Mica
Fixed
500 v
20%
C603
8 nn f Cer.
Fixed 500 v
25%
C604
47 M Cer.
Fixed
500 v 20%
R601
100 k
V w
Fixed
Resistors
Comp.
10%
R602
R603
Unassigned
820 k
Vz W
Fixed Comp.
10%
R604
100 k
Vz w
Fixed
Comp.
10%
R605
820 k
Vz w
Fixed
Comp.
10%
R610
100 k
1 w
Fixed Comp.
10%
R 611
56 k
Vz w
Fixed Comp.
10%
R612
50 k
2 w
Var.
Comp.
20% CAL. ADJ.
R620
18 k
Vz w
Fixed
Prec.
1%
R621
1.8 k
Vz w
Fixed
Prec.
1%
R622
180 ft
Vi W
Fixed
Prec.
1%
R623
20 0
Vz w
Fixed
Prec.
1%
SW601
Switches
1 Wafer
5 Position
CALIBRATOR
Vacuum Tubes
V601 12AT7 Calibrator Multivibrator
V602A 5^12AT7 Calibrator-Output Cathode Follower
V602B ^12AT7 Calibrator Amplifier and Shaper
TYPE 315— CALIBRATOR— PAGE 1
+ 225V
+ 225V
R603
820K
TYPE 315 CATHODE-RAY OSCILLOSCOPE
CALIBRATOR
Cer.
Comp.
EMC
f
GMV
h
k
meg
fifi
ABBREVIATIONS
ceramic
composition
electrolytic, metal cased
farad
guaranteed minimum value
henry
kilohm or 103 ohms
megohm or 106 ohms
micro or 10'6
micromicro or 10*12
m
f t
PMC
Poly.
Prec.
PT
V
Var.
w
WW
milli or 10'3
ohm
paper, metal cased
polystyrene
precision
paper tubular
working volts dc
variable
watt
wire wound
C241A
C241B
C241C
C241D
C241E
C241F
C280A
C280B
C280C
C280D
C280E
C280F
C280G
C 282
R282A
R282B
R282C
R282D
R282E
R282F
R282G
R282H
R282J
R285
R291
RANGE AND MULTIPLIER
.1 fii
.01 fii
.001 /if
100 /i/if
22 fifii
12 fi/ii
1 Mf
•lMf
.01 /if
.001 /if
7-45 /i/if
82 fifif
3-12 h/jl{
.01 fii
183 k
60 k
56.5 k
1.84 meg
608 k
608 k
18.6 meg
6.12 meg
6.12 meg
10 k
3.3 k
PT
PT
PT
Cer.
Cer.
Cer.
PMC
PT
PT
PT
Cer.
Cer.
Cer.
PT
A w Fixed
A w
A w
lAt w Fixed
Vz w
Vz w
2 w
Vz w
Vz w Fixed
1 w
Vz w Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Var.
Fixed
Var.
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Capacitors
400 v
400 v
600 v
500 v
400 v
500 v
400 v
400 v
400 v
600 v
500 v
500 v
500 v
400 v
Resistors
Prec.
Prec.
Prec.
Prec.
Prec.
Prec.
Prec.
Prec.
Prec.
Comp.
Prec.
SWITCH
20%
20%
20%
20%
20%
20%
Selected
Selected
Selected
Selected /
20%
20-%
i%
i%
i%
i%
i%
i%
i%
i%
10%
1%
DETAIL
\
r Timing Series
I See Text
SW202
SW203
4 Wafer
4 Wafer
Switches
4 Position
8 Position
TYPE 315— RANGE AND MULTIPLIER SWITCH DETAIL— PAGE 1
Rotary SW EEP M ULTIPLIER
Rotary SW EEP RANGE
TYPE 315 CATHODE-RAY OSCILLOSCOPE
£(U P
3 -1 6-53
TIME BASE
RANGE 8 MULTIPLIER SWITCH DETAIL
Figure 3
SWITCHING DETAIL
ABBREVIATIONS
Cer.
ceramic
m
milli or 10*3
Comp.
composition
(2 ohm
EMC electrolytic, metal cased
PMC
paper, metal cased
f
farad
Poly.
polystyrene
GMV
guaranteed minimum value
Prec. precision
h
henry
PT
paper tubular
k
kilohm or 103 ohms
V
working volts dc
meg
megohm or 106 ohms
Var. variable
micro or 10'6 w
watt
/ip
micromicro or 10"12
WW
wire wound
TIME BASE
C244
4.7 ppi Cer.
Fixed
Capacitors
500 v ±1 ppi
C250
47 ppi Cer.
Fixed
500 v
20%
C251
12 p pi Cer.
Fixed 500 v
10%
C260 5-20 p p i
Cer.
Var.
500 v.
C261 47 p p i
Cer.
Fixed
500 v
20%
C 262 8 pp i
Cer.
Fixed 400 v
±.5 p p i
C263 .001 p i Cer.
Fixed 500 v
GMV
C271
C272
Unassigned
47 ppi Cer.
Fixed
500 v
20%
C276 1.5-7 ppi
Cer.
Var.
500 v
C282
.01 pi PT
Fixed
400 v
20%
C290 1.5-7 ppi
Cer.
Var.
500 v
C291 4.7 ppi
Cer.
Fixed 500 v
±1 ppi
C303 .5-5 p p i
Poly. Var.
500 v
C325
.01 p i PT
Fixed
600 v
20%
C326
.01 p i PT
Fixed
400 v
20%
C327 M p i PT
Fixed 400 v
20%
C328 .01 p i PT
Fixed
400 v
20%
R230
39 k
Yz w
Fixed
Resistors
Comp.
10%
R231
100 k
2 w Var.
Comp. 20% STABILITY
R232 18 k
2 w
Fixed Comp.
10%
R233 2.2 k
y2 w
Fixed
Comp.
10%
R234
470 k
Yz W
Fixed Comp.
10%
R235
680 k
V2 w
Fixed Comp.
10%
R236
470Q
Yz w
Fixed Comp.
10%
R239
47 0
Yz w
Fixed Comp.
10%
R240 22 k
2 w
Fixed Comp
10%
R241
22 k
Y2 w
Fixed Comp.
10%
R242
10 k
1 w
Fixed Comp.
10%
R243
390 k
Y2 W
Fixed Comp.
10%
R244
470 k
Yz w
Fixed
Comp.
10%
R245
47 0
Yz w
Fixed
Comp.
10%
R246 4.7 k
2 w
Fixed
Comp.
10% (with L246)
R247 4.7 k
2 w
Fixed Comp.
10%
R248
100 k
1 w
Fixed Comp.
10%
R250 150 k
Y2 w
Fixed Prec.
1%
R251
150 k
Yz w
Fixed Comp.
10%
R252 4.7 k
2 w
Fixed
Comp.
10%
TYPE 315— TIME BASE—PAGE 1
Resistors (Cont.)
R253 100 k
XA w
Fixed
Comp.
10%
R254
50 k
2 w
Var.
Comp.
20% MULTI STABILITY
R255 120 k
V z w
Fixed Prec.
1%
R260 700 k
w
Fixed Prec.
1%
R261
50 k
2 w Var.
Comp.
20% SW EEP LENGTH
R262
47 k
1 w
Fixed Comp.
10%
R263
1 meg
V z w
Fixed
Comp.
10%
R264
47 n
V z W
Fixed Comp.
10%
R265
47 n
w
Fixed Comp.
10%
R270 500 k
V z W
Fixed Prec.
1%
R271 100 k
1 w Fixed Comp.
10%
R272
18k
1 w
Fixed
Comp.
10%
R273
47 k 2 w
Fixed
Comp.
10%
R274
22 k
2 w
Fixed
Comp.
10%
R275
4.7 k
V z w
Fixed Comp.
10%
R276 3.9 k
x/ z W
Fixed Comp.
10%
R279
15
1 w
Fixed
Comp.
10%
R280 22 k
2 w
Fixed Comp.
10%
R281
22 k
2 w
Fixed Comp.
10%
R283
500 k
2 w Var.
Comp.
20% 10-1
R284
18k
2 w
Fixed Comp.
10%
R285
10 k
1 w
Fixed Comp.
10%
R286 10 k
2 w
Var.
WW
20% SW EEP CAL.
R287 8.2 k
>2 W
Fixed
Comp.
10%
R288
20 k
2 w
Var.
Comp.
20% HORIZ. POSITION
R289
1.75 meg
k2 W
Fixed
Prec.
1%
R290
2.44 meg
x/ z w
Fixed
Prec.
1%
R291
3.3 k
l V z W
Fixed Comp.
10%
R300
200 k
>2 W
Fixed
Prec.
1%
R301
47 k
1 w
. Fixed
Comp.
10%
R302
47 k
1 w
Fixed Comp.
10%
R303
700 k
V z w
Fixed
Prec.
1%
R304
433 k
> 2 w
Fixed
Prec.
1%
R305
68 k
lv /
Fixed
Comp.
10%
R306
10 k
2 w
Var.
WW
20% MAG. CENTERING
R308
22 k
2 w
Fixed Comp.
10%
R309
Unassigned
R310
20 k
10 w
Fixed
WW
10%
R311
30 k
10 w
Fixed
WW
10%
R315
50012
2 w
Var.
Comp.
20% MAG. GAIN
R316
4712
k2 W
Fixed
Comp.
10%
R317
18 k
2 w
Fixed
Comp.
10%
R318
20 k
10 w
Fixed
WW
10%
R319
68 k
2 w
Fixed Comp.
10%
R325
4712
k2 w
Fixed
Comp.
10%
R326
4712
w
Fixed
Comp.
10%
R327 4712
k2 w
Fixed
Comp.
10%
R328
4712
Vt. w
Fixed
Comp.
10%
TYPE 315— TIME BASE— PAGE 2
Inductors
L246 70 Fixed Wound on R246
Vacuum Tubes
V203
6BQ7
Trigger Amplifier
V204A
546BQ7
Trigger Cathode Follower
V204B
J46BQ7
Sweep Holdoff Cathode Follower
V205A
J412AT7
Clamp Diode
V205B
J412AT7
Sweep Holdoff
V210A
H6BQ7 Unblanking Cathode Follower
V210B
K6BQ7
Buffer Cathode Follower
V211
6BQ7
Cascode Multivibrator
V212
6BQ7
Cascode Multivibrator
V213A
5412AT7 Constant Current Tube
V213B
J^12AT7
Multivibrator Reverting Cathode Follower
V214A
^6U8
Gate-Output Cathode Follower
V214B
H6U8
Sweep-Clamping Cathode Follower
V215A
J46AL5 DC Feedback Diode
V21SB
#6AL5
Sweep-Clamping Diode
V220
6AK6 Sweep Generator
V221A
546BQ7
Sweep-Out Cathode Follower
V221B
546BQ7
Sweep-Position Cathode Follower
V222A
^6BQ7
Driver Cathode Follower
V222B
y26BQ7
Sawtooth-Out Cathode Follower
V223A
H6BQ7
Sweep-Output Cathode Follower
V223B
546BQ7 Sweep Amplifier
V224A
^6BQ7
Sweep-Output Cathode* Follower
V224B
546BQ7 Sweep Amplifier
TYPE 315—TIME BASE—PAGE 3
TIME BASE
Figure
ABBREVIATIONS
Cer.
ceramic
m milli or 10‘3
Comp.
composition O
ohm
EMC
electrolytic, metal cased
PMC
paper, metal cased
f
farad
Poly.
polystyrene
GMV
guaranteed minimum value
Prec.
precision
h
henry
PT
paper tubular
k
kilohm or 103 ohms
V
working volts dc
meg
megohm or 106 ohms
Var. variable
A*
micro or 10"6
w
watt
fifi
micromicro or 10'12
WW
wire wound
Cl
A r t
PT
Fixed
C2
5-20 fifii
Cer.
Var.
C3
1.5-7 fifif Cer.
Var.
C4
27 fifii
Cer.
Fixed
C5
5-20 fifif
Cer.
Var.
C6
1.5-7 nni
Cer.
Var.
C7
330 fifii
Mica
Fixed
C8
Unassigned
C9
6.25 iif
EMC Fixed
CIO
5-20 fifii
Cer.
Var.
Cll
6.25 iif
EMC Fixed
C12
22 iif
PT
Fixed
C13
.01 fif
Cer.
Fixed
C16
.02
Cer.
Fixed
C17
.01 /Ltf
Cer.
Fixed
C25
.01 Ilf
Cer.
Fixed
C26
.01 Ilf
Cer.
Fixed
C27 .01 iif
Cer.
Fixed
C101
3-12 fi,(if
Cer.
Var.
R1
900 k
1 w
Fixed
R2
111 k
Vz w
Fixed
R3
990 k
1 w
Fixed
R4
10.1 k
Vz w
Fixed
R5
1 meg
Yz w
Fixed
R6
Unassigned
R7
1 meg
Vz w
Fixed
R10
100 O
Vz w
Fixed
Rll
47 0
Vz w
Fixed
R12
47 0
Vz w
Fixed
R13
22 k
2 w
Fixed
R14
27 k
2 w
Fixed
R15
200 0
2 w Var.
R16
12 0
Vz w
Fixed
R19
6.8 k
Vz W
Fixed
R20
600 k
y2 w
Fixed
PREAMP
Capacitors
600 v 20%
500 v
500 v
500 v 20%
500 v
500 v
500 v 20%
300 v —20% +50%
500 v
300 v —20% +50%
400 v 20%
500 v GMV
500 v GMV
500 v GMV
500 v GMV
500 v GMV
500 v GMV
500 v
Resistors
Prec. 1%
Prec. 1%
Prec. 1%
Prec. 1%
Prec. 1%
Prec. 1%
Comp. 10%
Comp. 10%
Comp. 10%
Comp. 10%
Comp. 10%
Comp. 20% PREAMP GAIN ADJ
Comp 10%
Comp. 10%
Prec. 1%
TYPE 315— PREAMP—PAGE 1
R21
610 k
V z w
Fixed
R22
Unassigned
R23
4.3 k
2 w
Fixed
R24
5.6 k
2 w
Fixed
R25
5.6 k
2 w
Fixed
R30 l k
2 w
Fixed
R31
47 0
V z w
Fixed
R32
27 k
2 w
Fixed
R33
33 k
2 w
Fixed
R36 150 0
Y z w
Fixed
R97 100 0
V z w
Fixed
R98
100 O
2 w
Var.
R101
9 meg
^ w
Fixed
Resistors (Cont.)
Prec.
1%
Comp.
5%
Comp.
10%
Comp.
10%
Comp.
10%
Comp.
10%
Comp.
10%
Comp.
10%
Comp.
10%
Comp.
10%
Comp.
20% HUM BALANCE
Comp.
10%
Vaccum Tubes
VI 6BQ7 Input Cathode Follower
V2A }46B Q 7 Amplifier
V2B J^6BQ7 Output Cathode Follower
Inductors
LI 2.2-3.9 fih Var. CV222
L2 19-35 /ih Var. CV193
Switches
SW1 2 Wafer 7 Position Rotary AMPLITUDE
TYPE 315— PREAMP—PAGE 2
♦ 1 00 V
ON po w en SUPPLY
IW PUT
TY PE 3 15 C A T H O D E -R A Y O SC IL LO SCO PE
PR.EAMP i-is-sa r.»H
Figure 5
ABBREVIATIONS
Cer.
ceramic
m milli or 10‘3
Comp.
composition
ft
ohm
EMC
electrolytic, metal cased
PMC
paper, metal cased
f farad
Poly. polystyrene
GMV
guaranteed minimum value Prec. precision
h
henry PT
paper tubular
k
kilohm or 103 ohms
V
working volts dc
meg
megohm or 106 ohms Var.
variable
A4
micro or IQ'6 w
watt
w
micromicro or 10'12
WW wire wound
POWER SUPPLY
Capacitors
C401
2x40 pi
EMC Fixed
250 v —20% +50%
C402
125 pi
EMC Fixed
350 v —20% +50%
C403
M p i
PT
Fixed
400 v
20%
C404
.01 p i PT
Fixed 400 v 20%
C420
2x40 pi
EMC
Fixed
250 v —20% +50%
C421
.01 pi PT
Fixed 400 v 20%
C422A
A 3x10 p i
EMC
Fixed 450 v
—20% +50%
C422B
A 3x10 p i EMC Fixed 450 v
—20% +50%
C422C
A 3x10 pi
EMC Fixed
450 v
—20% +50%
C440 2x40 pi
EMC
Fixed 450 v
—20% +50%
C441
.O lp i PT
Fixed 400 v 20%
C460
2x40 pi
EMC
Fixed
250 v —20% +50%
C461 .01 p i
PT
Fixed
400 v
20%
Resistors
R401 39 k
A w
Fixed
Comp.
10%
R402 47 k
Vz w
Fixed
Comp.
10%
R403
12 k
Vz w
Fixed
Comp.
10%
R404
1 meg
Vz w
Fixed
Comp.
10%
R405
1 k
Vz w
Fixed
Comp.
10%
R406
33 k
Vz w
Fixed Comp.
10%
R407
1 meg
Vz w
Fixed
Comp.
10%
R408 2k
20 w
Fixed
WW
5%
R409
220 k
y2 w
Fixed Comp.
10%
R410 100 k
2 w Var.
Comp. 20% ADJ. TO —150 V
R411 270 k
Vz w
Fixed
Comp.
10%
R412
50 0
2 w Var.
WW 20% SCALE ILLUM.
R420 39 k
l/2 W
Fixed Comp.
10%
R421 270 k
l/ 2 w
Fixed Comp.
10%
R422
1 meg
Vz w
Fixed
Comp.
10%
R423 100 k
V z w
Fixed Comp.
10%
R424
143 k
Vz W
Fixed
Prec.
1%
R425
100 k
Vz W
Fixed
Prec.
1%
R440
1.5 meg
Vz w
Fixed Comp.
10%
R441 270 k
Vz w
Fixed
Comp.
10%
R442
56 k
Vz w
Fixed
Comp.
10%
R443
3.5 k
20 w Fixed
WW
5%
R444
220 k
Vz w
Fixed
Prec.
1%
R445 143 k
V z w
Fixed Prec.
1%
R461 27 k
V z w
Fixed
Comp.
10%
TYPE 315— POWER SUPPLY—PAGE 1
Resistors (Cont.)
R462
150 k
2 w
Fixed
Comp.
10%
R463
1.8 meg
54 w
Fixed
Comp.
10%
R464
1.8 meg
V z w
Fixed
Comp.
10%
R465
1.5 k
25 w
Fixed
WW
5%
R467
1.8 meg
Vz w
Fixed
Prec.
1%
R468
750 k
Vz w
Fixed
Prec.
1%
Switches
SW401 Single Pole Single Throw Toggle
Vacuum Tubes
V401
5651
Voltage Reference
V402
6AU6
DC Amplifier, —150v
V403
12B4
Series Regulator, —150v
V404
12B4
Series Regulator, —150v
V421
6AU6
DC Amplifier, -f*100v
V422
6AS5
Series Regulator, +100v
V441
6AU6
DC Amplifier, +225v
V442A
546080
Series Regulator, +225v
V442B
546080
Series Regulator, 4-350v
V461
6AU6
DC Amplifier, +350v
POW ER
TYPE 315— POW ER SUPPLY— PA GE 2
TYPE 315 CATHODE-RAY OSCILLOSCOPE
POWER SUPPLY
Figure 8
POWER SUPPLY
Cer.
Comp.
EMC
f
GMV
h henry
k
meg
M
MM
C14
CIS
C18
C20
C21
C22
.01 /if
1.5-7 tipi
.01 ni
.01 ni
6.25 /if
.01 nf
C501 1.5-7 w*f
CS02A-E 5-25 «»f
C511A-F 5-25 Mpf
C521A-F 5-25 mii
C522 1.5-7
ABBREVIATIONS
ceramic m milli or 10'3
composition
electrolytic, metal cased
farad
guaranteed minimum value
kilohm or 103 ohms
megohm or 106 ohms
micro or 10'6
micromicro or 10"12
a
PMC
ohm
paper, metal cased
Poly. polystyrene
Prec.
PT
V
Var.
w
WW
precision
paper tubular
working volts dc
variable
watt
wire wound
VERTICAL AMPLIFIER
Capacitors
Cer.
Cer.
Cer.
PT
EMC
PT
Fixed
Var.
Fixed
500 v GMV
500 v
500 v GMV
Fixed 400 v 20%
Fixed
Fixed 400 v
300 v —20% +50%
20%
Delay Line Capacitors
Cer.
Cer.
Cer.
Cer.
Cer.
Var. 500 v
Var.
Var.
Var.
Var.
500 v
500 v
500 v
500 v
L3
L4
L5
L6
L7
R34
R35
R40
R41
R42
R43
R44
R45
4.8-8.5 pih
28-50 /ih
28-50 mh Var.
50-96 Mh Var.
50-96 /ih
100 k
47 0
2.2 k
47 0
lk
Unassigned
8k
8k
R46 27 0
R50
R51
R52
R53
R54
470 0
2.5 k
1.2 k
10 k
2250 0
R55 5k
Inductors
Var.
Var.
Var.
CV482
CV283
CV283
CV513
CV513
Resistors
Vz w
Vz W
1 w
Vz W
Vz w
5 w
5 w
Vz w
Vz w
Fixed
Fixed
Fixed Comp.
Fixed Comp.
Fixed
Fixed
Fixed
Fixed Comp.
Fixed Comp.
1/10 w Var.
Vz w
1/10 w
2 w
2 w
Fixed
Var.
Var.
Var.
TYPE 315—VERTICAL AMPLIFIER— PAGE 1
Comp.
Comp.
Comp.
WW
WW 5%
Comp.
Comp.
Comp.
Comp.
Comp.
10%
10%
10%
10%
10%
5%
10%
10%
20%
10%
20%
20% 10-1
20% VERT. AMPL. DC BAL.
Resistors (Cont.)
R59
12 0
Vz w
Fixed
Comp 10%
R60
47 0
Vz w
Fixed
Comp. 10%
R61
47 0
Vz w
Fixed
Comp.
10%
R62
12 k
2 w Fixed
Comp.
10%
R63
470 k
Vz W
Fixed
Comp.
10%
R64
12 k 2 w
Fixed
Comp.
10%
R65
220 k
V z W
Fixed
Prec.
1%
R66
22 k
Vz w
Fixed
Comp. 10%
R69
22 k
Vz W
Fixed
Comp.
5%
R70
250 k
2 w
Var.
Comp.
20% VERT. POSITIO N
R71
27 0
Vz W
Fixed
Comp.
10%
R72
10 0
Vz W
Fixed
Comp.
10%
R73
27 0
Vz W
Fixed
Comp. 10%
R74
10 0
Vz W
Fixed
Comp. 10%
R75
2k 5 w
Fixed W W
5%
R76
2k 5 w
Fixed
WW
5%
R80
2.5 k
10 w Fixed
WW (non-
inductive)
5%
R81
6.8 k
Vz w
Fixed Comp.
10%
R82 47 0
Vz W
Fixed
Comp.
10%
R83
750 0
10 w Fixed
WW
5%
R84 2.5 k
10 w
Fixed W W (non-
inductive)
5%
R85
6.8 k
3^ w
Fixed
Comp.
10%
R90
100 0
2 w
Var.
Comp.
20% SEN SITIVITY ADJUST
R91
10 0
3^ w
Fixed
Comp. 10%
R92
27 0
^ w
Fixed
Comp.
10%
R93
27 0
W
Fixed Comp. 10%
R94
10 0
3^2 w
Fixed Comp. 10%
R95
47 0
3^2 W
Fixed Comp.
10%
R521
1.1 k
1 w
Fixed
Prec.
1%
Switches
SW2 1 Wafer 4 Position Rotary MULTIPLIER
Vacuum Tubes
V3
6CL6
Gain-Control Stage Input
V4
6CL6
Gain-Control Stage Output
V8A
3^6BQ7
Vertical-Position Cathode Follower
V8B
J/26BQ7
Driver Cathode Follower
V10
12BY7
Vertical-Output Amplifier
Vll
12BY7
Vertical-Output Amplifier
V12
12BY7
Vertical-Output Amplifier
V13
12BY7
Vertical-Output Amplifier
TYPE 315— VERTICAL AMPLIFIER— PAGE 2
I—
_ ,C $ O tA _L C 59 2 6 J l c »02C _ L C 5 0 2 D J _ C * 0 2 t C ftl lA „ C 51 IB C5IIC J L cSIID
_ C5IIE
_ c 5 i;p
_ CB2IA _ L
5-2 5 £ 5-25 £ 5 - 2 5 £ 5 - 2 5 £ 5 - 2 5 £ 5 2 5
■*5- 25 £ 5 -2 5 £ 6 - 2 5
*5 - 2 5 -
* 5- 25
*■ 5 25 -T*
----
aswpj
DELAY NETWORK,
+ IOOV
OM P OWE R SUP PLY + 2 25 V +2 25 V +2 2 5 V
TY P E 315 C A T H O D E -RA Y 0 5 C I L L 0 S C O PE
VERTI CAL A MPLIFIER
Figure 6
VERTICAL
ABBREVIATIONS
Cer.
ceramic
m milli or lO"3
Comp.
composition O
ohm
EMC electrolytic, metal cased
PMC
paper, metal cased
f
farad
Poly.
polystyrene
GMV
guaranteed minimum value
Prec. precision
h
henry
PT paper tubular
k
kilohm or 103 ohms
V working volts dc
meg
megohm or 106 ohms
Var.
variable
M
micro or
10'6
w
watt
MM
micromicro or 10'
1 2
WW
wire wound
TRIGGER SELECTOR AND
SHAPER
Capacitors
C200
.047 ^
PT
Fixed
400 v 20%
C201
.001 /if
Cer.
Fixed
500 v GMV
C202
12 /i/if
Cer.
Fixed
500 v 10%
C212
.001 /if Cer.
Fixed 500 v
GMV
C221
.001 /if
Cer.
Fixed
500 v
GMV
C222
Unassigned
C223
470 /i/if
Cer.
Fixed 500 v
20%
C22 7
22/i/if
Cer.
Fixed 400 v
20%
Resistors
R200
1 meg
Vl W
Fixed
Comp.
10%
R201
1 meg
lA w
Fixed Comp.
10%
R202
10k 1/10 w
Var.
Comp.
20%
R203 50 k
V
2
W
Fixed
Prec.
1%
R204 100 k
V
2
W
Fixed
Prec.
1%
R208
4.7 k
1 w
Fixed
Comp.
10%
R209
4.7 k
1 w
Fixed Comp.
10%
R210 18 k
2 w
Fixed Comp.
10%
R211
47 k
V
2
W
Fixed
Comp.
10%
R212
100 k
2 w Var.
Comp.
20% TRIGGER AM PLITUDE
DISCRIMINATOR
R215
100 k
V
2
w
Fixed Comp.
10%
R216 560 k
lA w
Fixed Comp.
10%
R217
390 k
w
Fixed
Comp.
10%
R220 2.2 k
Vi W
Fixed Comp.
10%
R221
1.5 k
1 w
Fixed
Comp.
10% (with L221)
R222
47 0
^ w
Fixed
Comp.
10%
R223
500 0 2 w
Var.
Comp.
20% TRIG. SENS.
R224
22 k
1 w
Fixed
Comp.
10%
R225 22 k
1 w
Fixed
Comp. 10%
R226 150 k
W
Fixed Prec.
1%
R227
95 k
^2 W
Fixed Prec.
1%
Switches
SW201
3 Wafer
10 Position Rotary
TRIGGER SELECTOR
Inductors
L221
150/ih
Fixed
Wound on R221
Vacuum Tubes
V201 12AT7 Trigger Phase Invertor
V202 6U8 Regenerative Trigger Amplifier
TYPE 315— TRIGGER SELECTOR AND SHAPER— PAGE 1
sw e o i c sw eo io s w e o u sw e o ie sw e o ie
V— - h ^ - , s e l e c to r !----------------------------------------------A- 1 - A A TRIGGER ^ELECTOR
TYPE 315 CATHODE-RAY OSCILLOSCOPE SHAPER
F ig u r e 2
Cer.
Comp.
EMC
f
ceramic m
composition a
electrolytic, metal cased
farad
GMV guaranteed minimum value
h
henry
k kilohm or 10s ohms
meg
megohm or 106 ohms
micro or 10"6
Hfi
micromicro or 10'12
HIGH VOLTAGE AND CRT CIRCUITS
C802
C803
C804
C805
C815 .0068 /if
C816 .0068 /if
C817 .022 /if PT
C818'
C901
C902
.001 /if
Cer.
Unassigned
.001 /if PT
.001 /if
PT
PT
PT
.0068 /if PT
.015/if PT
.015 /if
PT
ABBREVIATIONS
Capacitors
Fixed
Fixed
Fixed
Fixed
Fixed 3000 v
Fixed
Fixed 3000 v
Fixed
Fixed
500 v
600 v 20%
600 v
3000 v 20%
400 v
3000 v 20%
3000 v
PMC
Poly.
Prec.
PT
V
Var.
w
WW
GMV
20%
20%
20%
20%
20%
milli or 10‘3
ohm
paper, metal cased
polystyrene
precision
paper tubular
working volts dc
variable
watt
wire wound
R802
R803
R804
R805
1 meg
47 k
1.5 k
47 k
R816 1.2 meg
R817
R901
R902
R903
R904
R905
R910
R911
R912
R913
R914
2 meg
27 k
1.5 meg
2 meg
3.9 meg
1 meg
1 meg
1.5 meg
5.6 meg 2 w
5.6 meg
100 k
R920 20 k
V801A
V801B
V803
V804
V805
H12AT7
J412AT7
6AQ5
5642
5642
Resistors
l/z w
2 w
lA w
V2 W
V2 W
Fixed
Fixed Comp.
Fixed Comp.
Fixed Comp.
Fixed Comp.
2 w Var.
V2 W Fixed
lA w
V2 W
Fixed Comp.
Var.
2 w Fixed Comp.
V2 w
V2 w
V2 w
Fixed Comp.
Var.
Fixed Comp.
Fixed
2 w
l/z w Fixed Comp.
2 w
Fixed Comp.
Var.
Comp.
Comp.
Comp.
Comp.
Comp. 20% INTENSITY
Comp.
Comp.
Vacuum Tubes
DC Amplifier
Shunt Regulator
High-Voltage Oscillator
High-Voltage Rectifier
High-Voltage Rectifier
10%
10%
10%
10%
10%
20% H.V. ADJUST
10%
10%
20% FOCUS
10%
10%
10%
10%
10%
10%
20% ASTIGMATISM
TYPE 315— HIGH VOLTAGE AND CRT CIRCUITS—PAGE 1
+350 V
+ 330V
+350V UNRE6.
C802
.001
TYPE 315 CATHODE-RAY OSCILLOSCOPE
+ 350 V
HIGH VOLTAGE AND CRT CIRCUITS
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