Patent US2325714A successfully refreshed from Google Patents.
US3761827A
Expired / Lapsed
US
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Switching device for measuring electrical currents and voltages
Assignee: Siemens AG
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Filing: 1971-11-22
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Granted: 1973-09-25
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Expires: 1991-11-22
Abstract
Abstract A switching device is used for measuring electrical voltages and/or currents or their differences, particularly for measured values produced in the photometry from tests and comparative tests. The invention is particularly characterized in that values which are to be measured or compared are transformed into a sequence of impulses consisting of impulses following each other alternately in time sequence and having amplitudes corresponding to the measured values. The sequence of impulses, possibly after amplification, is further treated in two separate channels. The treatment consists in that when an impulse of the sequence is present which corresponds to one measured value in one or the other channel, the potential of the impulse sequence in that channel is shifted in the same direction by the corresponding amplitude value. The impulse sequences thus shifted are transmitted to a difference former.
Inventors
- 👤 G Tchang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:00
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/16; G01R; G01R19/00; G01R19/18; G06; G06G; G06G7/00; G06G7/12; G06G7/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
227 words
A device for measuring the difference between electrical voltages or currents derived from measured values, particularly in photometry, said device comprising transforming means transforming values which are to be compared into a single sequence of impulses consisting of impulses following each other alternately in time sequence and having amplitudes corresponding to the measured values, amplifying means connected to the output of said transforming means for amplifying said sequence of impulses, and circuit means connected to the output of said amplifying means, said circuit means comprising two separate treating channels for said sequence of impulses and a potential shifting device connected to each of said treating channels for shifting the potential of the whole impulse sequence in the one treating channel each time when an impulse corresponding to the one measured value is presented in said one channel to one direction by an amount corresponding to the amplitude of said one impulse and otherwise for shifting the potential of the whole impulse sequence in the other treating channel each time when an impulse corresponding to the other measured value is presented in said other channel to the same direction by an amount corresponding to the amplitude of said other impulse, and a difference former, connected to the outputs of that treating channels for producing the difference between the amplitudes of the so shifted one and other impulse sequence.
Claim 2
Independent Claim
227 words
A device for measuring the difference between electrical voltages or currents derived from measured values, particularly in photometry, said device comprising transforming means transforming values which are to be compared into a single sequence of impulses consisting of impulses following each other alternately in time sequence and having amplitudes corresponding to the measured values, amplifying means connected to the output of said transforming means for amplifying said sequence of impulses, and circuit means connected to the output of said amplifying means, said circuit means comprising two separate treating channels for said sequence of impulses and a potential shifting device connected to each of said treating channels for shifting the potential of the whole impulse sequence in the one treating channel each time when an impulse corresponding to the one measured value is presented in said one channel to one direction by an amount corresponding to the amplitude of said one impulse and otherwise for shifting the potential of the whole impulse sequence in the other treating channel each time when an impulse corresponding to the other measured value is presented in said other channel to the same direction by an amount corresponding to the amplitude of said other impulse, and a difference former, connected to the outputs of that treating channels for producing the difference between the amplitudes of the so shifted one and other impulse sequence.
Claim 3
Dependent Claim
162 words
A device in accordance with claim 1, wherein each treating channel consists of an inlet condenser connected in series to the output of said amplifying means, and a high-ohmic impedance operational amplifier connected in series with said inlet condenser and wherein said potential shifting device comprises switching means connected to a point in the electrical line between said condenser and said high-ohmic impedance operational amplifier and being adApted to set the zero line potential to said point and further comprising a switch actuating device connected with the switching means of each channel and operable to switch the switching means of said one channel to connect the zero line potential to said one channel when an impulse derived from said one measured value appears in said one channel and to switch the other switching means of said other channel to connect the zero line potential to said other channel when an impulse derived from said other measured value appears in said other channel.
Claim 4
Dependent Claim
38 words
A device in accordance with claim 1, wherein said transforming means comprise a switch-over device and a multivibrator clock connected with and actuating said switch-over device, said switch-over device alternately testing the measured values one after the other.
Claim 5
Dependent Claim
33 words
A device in accordance with claim 3, wherein said transforming means further comprise means adjusting the clock frequency of said clock, said frequency for measuring photometric values being in the range of kHZ.
Claim 6
Dependent Claim
22 words
A device in accordance with claim 4, wherein the ratio between pulse duration and pause duration is greater than one, preferably 3:1.
Claim 7
Dependent Claim
20 words
A device in accordance with claim 5, wherein the duration of impulses corresponding to individual measured values is the same.
Claim 8
Dependent Claim
22 words
A device in accordance with claim 1, wherein in the case of photometry said amplifying means consists of a logarithmically operating amplifier.
Claim 9
Dependent Claim
20 words
A device in accordance with claim 3, wherein said switch actuating device is connected with and operated by said clock.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |