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Патент USA US2128395

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Aug- 30, 1938-
' _w. BERNDT ET AL
2,128,395
MEASURING fNSTRUMENT
Filed May 19, 19157
RADIO 0-‘
RECEIVER
~
0.
INVENTORS
.
W BERNDTAND H. E. PAUL
BY
ATTO'RNEY
Patented Aug‘. 30, 1938
2,128,395
UNITED STATES PATENT OFFICE
2,128,395
,
.
-
MEASURING INSTRUMENT
Walter Berndtand Hans Erich Paul, Berlin, Ger
many, assigns to Telefunken Gesellschaft iiir
Drahtlose Telegraphic m. b.‘ 11., Berlin, Ger
many, a corporation of Germany
.
Application May 19, 1937, Serial No. 143,491
Germany July 6, 193 6
5 Claims. (CI. 179_175.31)
For measuring or comparing the output poten- _
in a dark room. Hence, accuracy of the measure,
ments is greatly dependent upon the illumination
, of the ambient.
present, and this simply on the ground that opti
cal indication is relied upon.
‘
'
Far more favorable is acoustic indication as 10
for instance, of a potentiometer such a high nega- 15
ure and criterion for the value of the output po
tential of the receiver.
'
2°
But this scheme involves the shortcoming that
_ suddenly, but decreases very gradually. However, 25
3
ments known in the art.
Another arrangement designed to measure the
output potential of receivers is known in the prior
device a biased glow-discharge path or a con- 30
this pathrepresents no essential resistance for ,35
potential. The potentiometer adjustment is then
a measure and criterion for the output voltage of
the receiver.
-
-
However, this scheme involves these drawbacks:
For exact measurements, more particularly in the
open air, the glow-tube must be very brilliant.
This, in the ?rst place, implies a high watt con
potentials of glow-tubes, it connected in proper
circuits, are quite well de?ned, though the lumi
matching is insured between the various inner 40
A circuit organization without transformers is 45‘
nous e?'ect is poor. But the greater the requisite
brilliance or luminosity of the glow-tube, the re
veloped across iron-cored coil D and transferred
through condenser C. ‘
_
60
The measurement takes place in the following manner: By reduction 01' the biasing voltage at -
'
2
_
2,128,895 .
fering stations which come in with a higher potential will, to be sure, then still be audible, but
can aurally be distinguished from the signal to
connections between said glow tube electrodes and
spaced apart points on saidresistor.
2. The method of measuring an alternating
be measured. The_more the biasing voltage may
5 be diminished, the higher the output potential
of the receiver. Adjustment of the potentiometer
current of audio frequency which comprises the
steps of transmitting the current through the
space between the electrodes of a glow discharge
furnishing the‘biasing voltage may be provided tube, converting the transmitted current into
with a scale calibrated to read directly in terms sound waves and applying a steady potential be
of receiver output potential. But it will be found tween said electrodes of such value that the total
10 desirable to furnish the' calibrated scale with e?ective voltage therebetween isjust su?icient to
variable zero (null) point adjustment.
cause the sound waves to be audible.
The arrangement of the invention particularly
3. A measuring device comprising the combina-I
makes it feasible to compare receiver output ,po-
tion of an amplifying tube having an anode, an
tentials subject to variations with time vwith a
15 constant output potential from an auxiliary or
measuring oscillator. This is the principle un-
input transformer having its primary connected
to said anode, an output transformer having pri
mary and secondary windings, a glow discharge
derlying most out?ts designed to measure the
tube having one electrode connected to one end v
?eld intensity of transmitter stations. The pre-
of the secondary winding of said input transform
cision of the measurements, when using a cali20 brated adjustable auxiliary transmitter or oscillator, is independent of the calibration of the
er and its other electrode connected to one end of
the primary of said output transformer, a circuit
including a condenser connectingthe other end of
potentiometer furnishing the biasing voltage since
the secondary of] said input transformer to the
it sufiices to work at constant potentiometer adjustment without knowing the absolute values of
25 the receiver output potential.
V
other end of the primary of said output trans
former, means for applying a variable unidirec
tional potential between the electrodes of said
‘
One special advantage residing in the use of
glow discharge tube and a sound translating de
a glow~discharge path is that the discharge path
vice coupled to the secondary winding of said
requires no additional circuit elements such as a '
output transformer.
triode tube and that there is no need for a heat-
30 ing source. Hence, in order to measure the out-
'
.
'
4. An indicating device comprising the combi
nation of an amplifying tube ‘having an anode, .
put potential of a receiver apparatus, all that is an inductance coil having its high potential end
required is a potentiometer and a small glow- connected to said anode, a source of positive po
discharge path, for the rest of the equipment is tential connected to the low potential end of
already in the receiver itself. Moreover, the glow- _ said inductance, a glow discharge path and a
35 discharge path requires but little space so that it
may be mounted at any desired place in the inte-
sound translating device ‘connected in series be
tween the high potential end of said coil' and
rior oi the receiver case; hence, the entire meas- the negative terminal of said potential source.
uring out?t may be ?tted in any receiver after it
5. An indicating device comprising the combi
has been completed, a feature that has been unat- nation of an amplifying tube having an anode,
40 tainable in arrangements known in the prior art an inductance coil having its high potential end
on account of lack of space. The arrangement connected to said anode, a source of steady po
hereinbefore described may be used not only in tential having its positive terminal connected to
connection with receivers, but also with ampli?ers the low potential end of said coil, a series circuit
of any kind.
comprising a condenser, a glow discharge tube
45 Having described our invention, what we claim and a sound translating device arranged in the
and desire to-secure by Letters Patent is:
1. A measuring device comprising the combi-
order named connected between said anode and
the negative terminal of said potential source, a
' nation of an amplifying tube having an output
circuit, a sound translating deviee,-a circuit cou-
resistor connected across the terminals of said
potential source and a connection between an in
50 pling said output circuit and translating device
and including a series connected glow discharge
termediate point of said resistor and one electrodt
of said glow'discharge tube.
tube having two electrodes, a steady source of
potential, a resistor connected across the terminals of said potential source and direct current
'
WALTER BERNDT.
HANS ERICH PAUL.
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