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Патент USA US2404738

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«MY 23, Í945°
A. E. MOULIN. JR., ETAL
2,404,738
0S C ILLOGRAPH
Filed Oct. 22, 1942
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Patented July 23, 1946
2,404,738 `
UNHTED STATES PATENT‘IUFFICE "
2,404,738
OSCILLOGRAPH
Albert E. Moulin, Jr., and Paul W. Urchard, Jr.,
New Orleans, La. -
Application October 22, 1942, ASerial No. 463,016
6 Claims.
( Cl. S15-.28)
1
2
Our invention relates to electric circuits, and
has among its objects and advantages the pro
vision of an oscillograph designed for operation
on alternating or direct current, wherein a vibra
tor is employed for converting battery or direct
Y
connects with the screen grid 54 of the cathode
ray tube. The cathode voltage is controlled by a
32,000 ohm potentiometer 56 grounded at 58.
Thus the grid bias is obtained from the poten
tiometer 56 connected from the cathode 60 0f the
tube to the ground as (-) voltage increases when
current into alternating current pulsations, and
in which the oscillograph may be employed for
the centerarmapproaches thev cathode point of
testing tone qualities of ampliñers, radios and
the control l(the ray becoming and finally reach
the like, testing strength of materials and me
ingA invisibility). l Whenthe arm Aapproaches the
chanical vibrations of all kinds, testing al1 types 10 groundposition,-the`converse occurs. An exter-v
of tubes, coils, interference noises, in addition to
nal sweep circuit 62 is employed, which Vincludes
its eñîcient service in various other fields.
two .001 microfarad coupling condensers 64 and
The figure is a diagrammatic illustraticn'of
a 5 megohmresistance 06 grounded at 68. The
our oscillograph circuit.
wiper 36‘connects with a line 10 leadingv to the
In the embodiment of the invention selected 15 platev'IZ of the cathode' ray tube and a switch‘fM `
for illustration, we make use of a vibrator cir
cuit I0 in association with direct current lines I2
and I4, which may connect with a battery or di
is interposed in this line.
e'
` The vertical sweep impulses are vfed to'the low
impedance winding of anvimpedance matching
rect current supply lines. The vibrator I0 in
transformer '16, are then transferred to the high
cludes a .02 microfarad 1,000 volt condenser I 6 20 resistance winding and are passed through a
shunted by a 5,000 ohm 10 watt resistance I8,
.00045v microfarad blocking condenser 'I8 to the
which are interposed in the line I2. The pri
vertical deñecting plates. The necessary poten
mary winding 20 of a power transformer 22 is
tial is supplied by a 5 megohm resistance 80 con
tapped for input voltages of 6, 32, 100 and 110,
nected from the B+ lead tothe deñector plate.
and is provided with a switch 24 for changing 26 This high resistance in the defiector circuit makes
from one voltage to another.
the ray'much more sensitive to signal changes.
110-120 volt 60 cycle alternating current lines
The transformer winding 82 may be connected
26 and 28 connect with the primary winding,
with the voice coils of' a dynamic speaker, while
and a 30 watt 100 ohm resistance 30 is interposed
the winding 04 may be connected with a magnetic
in the line 25. A sweep control 32 includes a .5 30 speaker coil `orother input, a .1 microfarad by
megohm resistance 34 and a wiper contact 36,
pass condenser 80 being vemployed as a blocking
the resistance being shunted across the’input
condenser in order to prevent the transformer
winding of the power transformer, with one ter
windings from shunting magnetic speaker wind
minal of the input winding connected to the B
ings. The sweep voltage is supplied from the con
supply lead.
The high voltage winding 38 of the power
trol 32 shunted acrossthe input winding, with
one end of the input winding connected to the
transformer has one terminal grounded at 39
B+ lead so that the control may'cancel any de
to the chassis and its other terminal connected
sired amount of sweep effect. When no sweep
with the parallel plates of a rectifier tube of the
voltage’is applied or the wiper is in its minimum
8O type so that it may be operated as a half 40 position, it cancels ‘all -horizontal sweep effect.
wave rectifier. There is a voltage of 350 in the
The cathode ray will appear as a'staticnary point
high voltage winding 38. This is sufficient to
produce a good cathode beam focus.
of light on the screen.
K
l
f
I
The ñla
The vertical signal amplitude is controlled by
ment winding 42 of the power transformer 22 con
a two point control shunted high resistance wind
nects With the filament -44 of the tube 40 and 45 ing of the coupling transformer 16. The advan
is grounded at 45 and connected with a .25 mi
crofarad condenser 48 employed'to filter the B+
voltage.
tages in ‘using an impedance matching trans
former reside in the fact that the oscillograph»,
may be clipped to any radio frequency receiver
The voltage from the filament All is applied to
or superheterodyne circuit without soldering or
the shell of a SIB cathode ray tube 50, which is 50 changing the circuit of- theset. 'Since Ythe trans
connected to the de?lecting plates. While there
may be a slight disadvantage in having a high
charge on the shell of this tube, the beam focus
is more accurate than if a negative or no voltage
were applied. A .5 megohmpotentiometer-52 55
formerlß is connected to the voice coil leads of
the speaker, the outputY of the device under test
serves as a verticalampliñer.
The removal of
thevertical amplifying tube increases the sim
plicity and decreases the’operating difficulties.v
2,404,738
Although the transformer 16 is the simplest de
vice, other inductance, capacitance, impedance,
resistance, electronic coupling, special filtering de
vices and/or combinations of the above can be
substituted for said transformer 15. When used
with a magnetic speaker circuit, or intercircuit
4
therefor, grid and defiecting plates, a control cir
cuit for the input to said cathode ray tube from
said transformer, a rectifier tube having plates
connected in parallel and a filament connected
with the grid and heater-cathode elements of
said cathode ray tube, a power transformer hav
ing a high voltage secondary winding connected
with the plates of said rectifier tube, means for
selectively supplying alternating current or con
The vibrator converter circuit is of relatively
simple construction and includes but one point 10 verted direct current to the primary winding of
the tarnsformer, a sweep voltage control shunted
thereby causing less wear on the vibrator parts.
across the primary winding of said power trans
It has the added feature of more current delivery
former and leading to a deflecting plate of the
with less arcing and is less difficult to maintain
cathode ray tube to cancel out any desired amount
in good operating condition than are vibrators of
15 of sweep effect, a connection between the pri
the multipoint type.
mary winding of said power transformer and
With respect to the power transformer 22, a
the filament of said rectifier tube, and a poten
special sweep voltage winding may be employed
tiometer controlling the biasing voltage applied to
instead of the type shown, although the type
the grid of the cathode ray tube.
illustrated is relatively simple in design and op
4. In an oscillograph circuit, the combination
eration. A vibrator of the self rectifying type
of an impedance matching transformer, a cathode
may be employed, in which case the tube 4G may
ray tube having a cathode, heater element there
be eliminated. Should a glass type tube 5E! be
for, grid and deflecting plates, a control circuit for
employed, the two deilector plates which are
the input to said cathode ray tube from said trans
connected to the metal shell should be con
former, a rectifier tube having plates connected
nected together and then to the B+ voltage sup
in parallel and a filament connected with the
ply.
grid and heater-Cathode elements of said cathode
Without further elaboration, the foregoing will
ray tube, a power transformer ‘having a high volt
so fully explain our invention, that others may, by
age secondary winding connected with the plates
applying current knowledge, readily adapt the
of said rectifier tube, means for selectively sup
same for use under various conditions of service.
plying alternating current or converted direct
We claim:
current to the primary winding of the trans
l. In an oscillograph circuit, the combination
former, a sweep voltage control shunted across the
of an impedance matching transformer, a cath
primary winding of said power transformer and
ode ray tube having a cathode, heater 'element
therefor, grid and deflecting plates, a control 1’ leading to a deñecting plate of the cathode ray
tube to cancel out any desired amount of sweep
circuit for the input to said cathode ray tube
effect, a connection `between the primary wind
from said transformer, a` rectifier tube having
ing of said power transformer and the ñlame‘nt of
plates connected in parallel and a filament con
said rectifier tube, a potentiometer controlling
nected with the grid and heater-cathode elements
of said cathode ray tube, a power transformer -10 the biasing voltage applied to the grid of the cath
ode ray tube, and a second potentiometer con
having a high voltage secondary winding con
trolling the ‘voltage applied to the cathode of said
nected with the plates of said rectiñer tube and a
cathode ray tube and connected from the cathode
secondary winding connected with the ñlament
to ground.
thereof, means for selectively supplying alternat
5. In an oscillograph circuit, the combination
ing current or converted direct current to the pri
of an impedance matching transformer, a cath
mary winding of the transformer, and a svi/'ecp~
ode ray tube having a cathode, heater element
voltage control shunted across the primary wind
therefor, grid and deñecting plates, a control cir
ing of said power transformer and leading to
cuit for the input to said cathode ray tube from
a deñecting plate of the cathode ray tube to cancel
said transformer, a rectifier tube having plates
out any desired amount of sweep effect.
connected in parallel and a ñlarnent connected
2. In an oscillograph circuit, the combination of
with the grid and heated-cathode elements of
an impedance matching transformer, a cathode
said cathode ray tube, a power transformer hav
ray tube having a cathode, heater element there
ing a high voltage secondary winding connected
for, grid and deflecting plates, a control circuit
with the plates of said rectifier tube and a second
for the input to said cathode ray tube from said
secondary winding connected with the filament
transformer, a rectifier tube having plates con
thereof, means for selectively supplying alternat
nected in parallel and a filament connected with
ing current or converted direct current to the
the grid and heater-cathode elements of said
primary winding of the transformer, a sweep volt
cathode ray tube, a power transformer having a
high voltage secondary winding connected with b1) age control shunted across the primary winding
of said power transformer and leading to a de
the plates of said rectifier tube and a second
ilecting plate of the cathode ray tube to cancel
secondary winding connected with the ñlainent
out any desired amount of sweep effect, a connec
thereof, means for selectively supplying the al
tion between the primary winding of said power
ternating current or converted direct current to
transformer and the filament circuit of said recti
the primary winding of the transformer, a sweep
fier tube, a potentiometer controlling the bias
voltage control shunted across the primary wind
ing Voltage applied to the grid of the cathode ray
ing of said power transformer and leading to a
tube, a second potentiometer supplying a voltage
deñecting plate of the cathode ray tube to cancel
connection, high resistance input provides con
siderable induction amplification.
out any desired amount of sweep effect, and a
connection between the primary winding of said “
power transformer and the filament of said recti
ñer tube.
to the cathode of the cathode ray tube and con
nected from the cathode to ground, and a filter
condenser connected from the filament of the
3. In an oscillograph circuit, the combination
of an impedance matching transformer, a cath
ode ray tube having a cathode, heater element
6. In an oscillograph circuit, the combination
of an impedance matching transformer, a cath
ode ray tube having a cathode, heater element
i
rectifier tube to ground.
.
Y
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2,404,738
¿j
therefor, grid and deñecting plate, a control cir
desired amount of sweep eiîect, a connection
cuit for the input to said cathode ray tube from
between the primary Winding of said power trans
said transformer, a rectiñer tube having plates
former and the ñlament circuit of said rectifier
connected in parallel and a filament connected
tube, a potentiometer controlling the biasing volt
with the cathode ray tube, a power transformer
age applied to the grid of the cathode ray tube,
having a high voltage secondary winding con
a second potentiometer supplying a voltage to
nected with the plates of said rectifier tube,
the cathode of the cathode ray tube and con
means for selectively supplying alternating cur
nected from the cathode to ground, and a ñlter
rent or converted direct current to the primary
condenser connected from the filament of the
winding of the transformer, a sweep voltage con if) rectifier tube to ground, said input control cir
trol shunted across the primary winding of said
cuit including a blocking condenser.
power transformer and leading to a deflecting
ALBERT E. MOULIN, J R.
plate of the cathode ray tube to cancel out any
PAUL W. ORCHARD, JR.
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