Патент USA US2128395код для вставки
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.