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Class Information
Number: 324/118
Name: Electricity: measuring and testing > Measuring, testing, or sensing electricity, per se > Modulator/demodulator
Description: Subject matter having means to modulate the voltage or current being measured onto a carrier wave and having further means to demodulate the resulting modulating carrier wave into a replica of the original voltage or current.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7449912 |
Fault detection circuit |
Nov. 11, 2008 |
| 7412338 |
Radio frequency device within an energy sensor system |
Aug. 12, 2008 |
| 7395044 |
Signal processing apparatus and method of differential transformer |
Jul. 1, 2008 |
| 7321482 |
Sub-circuit voltage manipulation |
Jan. 22, 2008 |
| 7305038 |
Peripheral device receiver detection in a high noise environment |
Dec. 4, 2007 |
| 7190714 |
Peripheral device receiver detection in a high noise environment |
Mar. 13, 2007 |
| 7126323 |
Systems and methods for synchronous detection of signals |
Oct. 24, 2006 |
| 6924724 |
Method and apparatus for transformer bandwidth enhancement |
Aug. 2, 2005 |
| 6885184 |
Galvanically isolated voltage sensing circuit |
Apr. 26, 2005 |
| 6809508 |
Detection circuitry for surgical handpiece system |
Oct. 26, 2004 |
| 6734659 |
Electronic interface for use with dual electrode capacitance diaphragm gauges |
May. 11, 2004 |
| 6590400 |
Inductive signature measurement circuit |
Jul. 8, 2003 |
| 6590379 |
Apparatus for detecting the envelope of an input signal |
Jul. 8, 2003 |
| 6489776 |
Non-contact mechanical resonance method for determining the near surface carrier mobility in conductors |
Dec. 3, 2002 |
| 6291980 |
High-resolution measurement of phase shifts in high frequency phase modulators |
Sep. 18, 2001 |
| 6259259 |
Method and apparatus for automatically adjusting the measurement range of admittance level sensors |
Jul. 10, 2001 |
| 6078870 |
Electricity meter with multiplexers for monitoring measurement channels |
Jun. 20, 2000 |
| 5917319 |
Methods and apparatus for sensing currents |
Jun. 29, 1999 |
| 5828576 |
Power monitor apparatus and method with object oriented structure |
Oct. 27, 1998 |
| 5650936 |
Power monitor apparatus and method with object oriented structure |
Jul. 22, 1997 |
| 5646520 |
Methods and apparatus for sensing currents |
Jul. 8, 1997 |
| 5594329 |
Method and apparatus for obtaining voltage-isolated measurement channels with an isolation transformer and multiplier |
Jan. 14, 1997 |
| 5471144 |
System for monitoring the insulation quality of step graded insulated high voltage apparatus |
Nov. 28, 1995 |
| 5440229 |
Fundamental voltmeter |
Aug. 8, 1995 |
| 5365184 |
Quadrature phase processing |
Nov. 15, 1994 |
| 5210484 |
Lock-in amplifier |
May. 11, 1993 |
| 5097229 |
Modulator - demodulator transformer coupled D.C. to one Mhz information channel |
Mar. 17, 1992 |
| 5083080 |
High frequency signal measuring equipment with cabled detecting and signal companding |
Jan. 21, 1992 |
| 5034681 |
Voltage detection |
Jul. 23, 1991 |
| 4949030 |
Isolated analog voltage sense circuit |
Aug. 14, 1990 |
| 4933888 |
Process for the digitization and linearization of a transducer with a quasi-sinusoidal periodic characteristic and corresponding apparatus |
Jun. 12, 1990 |
| 4890333 |
Test bench for wideband radio link |
Dec. 26, 1989 |
| 4814695 |
Measurement method for an electrical signal, series-parallel negative-feedback measuring circuit, as well as use of the method of the measuring circuit for measuring voltage sources with v |
Mar. 21, 1989 |
| 4747035 |
Isolator for power system instrument |
May. 24, 1988 |
| 4683436 |
Surface potential electrometer and image forming apparatus using the same |
Jul. 28, 1987 |
| 4669037 |
Isolator for power system instrument |
May. 26, 1987 |
| 4649336 |
Automatic, self sustaining probe for measuring the work function |
Mar. 10, 1987 |
| 4628256 |
Thermocouple power meter |
Dec. 9, 1986 |
| 4591810 |
Pulse width modulator for electronic watthour metering |
May. 27, 1986 |
| 4553099 |
Electrostatic voltage sensor |
Nov. 12, 1985 |
| 4412348 |
Apparatus for testing linearity of an FM transmitter |
Oct. 25, 1983 |
| 4341994 |
Power level measurement system |
Jul. 27, 1982 |
| 4264860 |
Resistor measuring apparatus |
Apr. 28, 1981 |
| 4264861 |
Electronic ampere-hour meter |
Apr. 28, 1981 |
| 4263558 |
Phase-selective amplifier |
Apr. 21, 1981 |
| 4237417 |
Signal transmission apparatus of two-wire type |
Dec. 2, 1980 |
| 4218140 |
Light meter |
Aug. 19, 1980 |
| 4188586 |
Demodulator circuit for chopper amplifier |
Feb. 12, 1980 |
| 4134059 |
Method and apparatus for measuring the corrosion current of an immersed structure provided with a cathodic protection device |
Jan. 9, 1979 |
| 4047099 |
Method and apparatus for determining boiler water conductivity |
Sep. 6, 1977 |
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