US4213085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase inversion test device
Assignee: Individual
•
Filing: 1978-08-28
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Granted: 1980-07-15
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Expires: 1998-08-28
Abstract
Abstract A device for testing phase inversion of a circuit includes a signal generator having an assymetrically shaped positive phased test signal output electrically connected through a buffer circuit to the input of the circuit under test. A differentiator circuit electrically connected to the output of the test circuit, produces in response to the test circuit output, rectangular pulses whose amplitudes are proportional to the slopes of the test waveform. The differentiated output signals are isolated into positive and negative signals by a plurality of peak detectors whose outputs are fed to a summing amplifier. The summing amplifier amplifies the difference between the positive and negative isolated peak voltages and in turn drives a polarity indicating device which was previously calibrated to indicate a positive or negative polarity as either a phase or non-phase inversion. An alternate mode of measuring pulses directly and bypassing the differentiator is also provided.
Inventors
- 👤 Daniel J. Ramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:21
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/14; G01R27/00; G01R27/28
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
249 words
A device for testing phase inversion of a circuit under test which comprises: signal generator means for generating an assymetrical test signal; means for electrically coupling said assymetrical test signal to said circuit under test; means for receiving a plurality of output signals from said circuit under test; first switching means for selectively testing a first output signal of said plurality of output signals from said circuit under test; differentiator means electrically coupled to said first switching means for generating a plurality of voltages proportional to the slopes of said assymetrical test signal; means for electrically by-passing said differentiator means; polarity oriented peak detector means, electrically coupled to said means for electrically by-passing, for generating D.C. voltages and isolating said plurality of voltages porportional to the slopes of said assymetrical test signal when said differentiator means is utilized, said D.C. voltages are proportional to peak amplitudes of said assymetrical test signal when said differentiator means is by-passed, and for integrating frequency dependent variations within a sweep range of said assymetrical test signal; summing amplifier means for summing the output of said peak detector means and amplifying the difference between said D.C. voltages generated therefrom; and indicator means, electrically coupled to said amplifier means for registering a change in polarity in response to the output of said amplifier means, said indicator means calibrated to represent no phase inversion for a positive polarity indication from said indicator means and a phase inversion for a negative polarity indication from said indicator means.
Claim 2
Independent Claim
249 words
A device for testing phase inversion of a circuit under test which comprises: signal generator means for generating an assymetrical test signal; means for electrically coupling said assymetrical test signal to said circuit under test; means for receiving a plurality of output signals from said circuit under test; first switching means for selectively testing a first output signal of said plurality of output signals from said circuit under test; differentiator means electrically coupled to said first switching means for generating a plurality of voltages proportional to the slopes of said assymetrical test signal; means for electrically by-passing said differentiator means; polarity oriented peak detector means, electrically coupled to said means for electrically by-passing, for generating D.C. voltages and isolating said plurality of voltages porportional to the slopes of said assymetrical test signal when said differentiator means is utilized, said D.C. voltages are proportional to peak amplitudes of said assymetrical test signal when said differentiator means is by-passed, and for integrating frequency dependent variations within a sweep range of said assymetrical test signal; summing amplifier means for summing the output of said peak detector means and amplifying the difference between said D.C. voltages generated therefrom; and indicator means, electrically coupled to said amplifier means for registering a change in polarity in response to the output of said amplifier means, said indicator means calibrated to represent no phase inversion for a positive polarity indication from said indicator means and a phase inversion for a negative polarity indication from said indicator means.
Claim 3
Dependent Claim
49 words
A device for testing phase inversion as recited in claim 1 wherein said signal generator means comprises: a free-running sawtooth generator having a voltage output; and a voltage controlled sawtooth generator, electrically coupled to said free-running sawtooth generator, generates a repetitive swept frequency assymetrical waveform at an output thereof.
Claim 4
Dependent Claim
47 words
A device for testing phase inversion as recited in claim 2 wherein said signal generator means comprises: a manual trigger source means for initiating a pulse signal; and a monostable multivibrator, electrically coupled to said manual trigger source means for generating a single assymetrical pulse test signal.
Claim 5
Independent Claim
97 words
A device for testing phase inversion as recited in claims 2 or 3 wherein said means for electrically coupling comprises: a first single pole double throw switch having a first switch terminal electrically connected to the output of said voltage controlled sawtooth generator and a second switch terminal electrically connected to an output of said monostable multivibrator; and a buffer and/or equalizer circuit member electrically coupled to a pole member terminal of said first single pole double throw switch, said buffer and/or equalizer circuit member operatively functioning to lower the output impedance of said signal generator means.
Claim 6
Dependent Claim
85 words
A device for testing phase inversion as recited in claim 4 wherein said means for receiving a plurality of output signals comprises: a microphone operatively positioned proximate to an acoustic output of said circuit under test; a preamplifier, electrically coupled to said microphone, having an output electrically connected to a first switch terminal of said first switching means; and an input terminal jack electrically coupled to a second switch terminal of said first switching means which includes a second single pole double throw selector switch.
Claim 7
Dependent Claim
105 words
A device for testing phase inversion as recited in claim 5 wherein said means for electrically by-passing said differentiator means comprises: a by-pass conductor having one end electrically coupled to a common junction point intermediate said second single pole double throw selector switch and said differentiator means and an other end; a by-pass single pole double throw switch having a first switch terminal electrically coupled to an output of said differentiator means and a second switch terminal electrically connected to said other end of said by-pass conductor, and a pole member electrically connected to a common input junction of said polarity oriented peak detector means.
Claim 8
Dependent Claim
84 words
A device for testing phase inversion as recited in claim 6 wherein said polarity oriented polar detector means comprises: a positive peak detector having an input electrically coupled to said common junction of said peak detector means and an output electrically coupled to a first input of said summing amplifier means; and a negative peak detector having an input electrically coupled to said common junction of said peak detector means and an output electrically coupled to a second input of said summing amplifier means.
Claim 9
Dependent Claim
97 words
A device for testing phase inversion as recited in claim 7 wherein said indicator means comprises: a first light emiting diode electrically coupled to an output of said summing amplifier means, said light emiting diode being activated when a positive resultant voltage is generated by said summing amplifier means and indicating thereby no phase inversion; a second light emiting diode electrically connected in parallel and in reverse polarity with said first light emiting diode, said light emiting diode being activated when a negative resultant voltage is generated by said summing amplifier means, indicating thereby a phase inversion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |