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Class Information
Number: 324/99D
Name: Electricity: measuring and testing > Measuring, testing, or sensing electricity, per se > Balancing (e.g., known/unknown voltage comparison, bridge, rebalancing) > Automatic > Digital voltmeters
Description:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7365528 |
Method and apparatus of voltage measurement using flying capacitor and switching circuits |
Apr. 29, 2008 |
| 7352166 |
Resistance ratio digitizing ohmmeter system |
Apr. 1, 2008 |
| 7342393 |
Multimeter with filtered measurement mode |
Mar. 11, 2008 |
| 7336063 |
Voltage detector |
Feb. 26, 2008 |
| 7304467 |
Circuit for simultaneous testing of electricity meters with interconnected current and voltage circuits |
Dec. 4, 2007 |
| 7271578 |
Voltage monitoring circuit |
Sep. 18, 2007 |
| 7034517 |
Multimeter with filtered measurement mode |
Apr. 25, 2006 |
| 6992489 |
Multiple voltage level detection circuit |
Jan. 31, 2006 |
| 6975103 |
Resistance ratio digitizing ohmmeter system |
Dec. 13, 2005 |
| 6975104 |
Clamp meter with dual display |
Dec. 13, 2005 |
| 6936978 |
Methods and apparatus for remotely controlled illumination of liquids |
Aug. 30, 2005 |
| 6927564 |
Multimeter instrument with touch-sensitive selection device |
Aug. 9, 2005 |
| 6870358 |
Methods and apparatuses for peak detection among multiple signals |
Mar. 22, 2005 |
| 6794859 |
Automatic multimeter |
Sep. 21, 2004 |
| 6731102 |
Electronic test instrument with extended functions |
May. 4, 2004 |
| 6646430 |
Current measuring shunt with circuitry mounted thereon |
Nov. 11, 2003 |
| 6556003 |
Computer multimeter |
Apr. 29, 2003 |
| 6507183 |
Method and a device for measuring an analog voltage in a non-volatile memory |
Jan. 14, 2003 |
| 6466003 |
Microamp measurement for two-terminal digital meter |
Oct. 15, 2002 |
| 6429641 |
Power booster and current measuring unit |
Aug. 6, 2002 |
| 6380726 |
Smart auto-ranging RMS measurement method and apparatus |
Apr. 30, 2002 |
| 6119073 |
Variable color digital measuring instrument for sequentially exhibiting measured values |
Sep. 12, 2000 |
| 5920196 |
Rapid low voltage testing apparatus |
Jul. 6, 1999 |
| 5764048 |
Ultra high accuracy voltage measurement system |
Jun. 9, 1998 |
| 5621311 |
Digital multimeter having an improved enclosure |
Apr. 15, 1997 |
| 5619114 |
Signal averager for use with motor controller |
Apr. 8, 1997 |
| 5543707 |
Digital tester |
Aug. 6, 1996 |
| 5455513 |
System for measuring properties of materials |
Oct. 3, 1995 |
| 5446371 |
Precision analog-to-digital converter with low-resolution and high-resolution conversion paths |
Aug. 29, 1995 |
| RE34899 |
Analog to digital conversion with charge balanced voltage to frequency converter having polarity responsive offset |
Apr. 11, 1995 |
| 5396168 |
Digital multimeter with microprocessor control |
Mar. 7, 1995 |
| 5392218 |
Electrically isolated approach to sensing dc voltages referenced to a floating ground |
Feb. 21, 1995 |
| 5373237 |
Radio frequency power measurement system |
Dec. 13, 1994 |
| 5260647 |
Measuring an AC signal value with sampling when the sampling interval does not exactly divide the AC signal's period |
Nov. 9, 1993 |
| 5256961 |
Method for measuring various measurable variables, and multimeter for performing the method |
Oct. 26, 1993 |
| 5250893 |
Digital voltmeter |
Oct. 5, 1993 |
| 5218290 |
Multi-function, multi-mode switch for an instrument |
Jun. 8, 1993 |
| 5153510 |
High impedance system for measuring voltage |
Oct. 6, 1992 |
| 5153511 |
Test lead socket indicating device for a volt-ohm-milliameter |
Oct. 6, 1992 |
| 5153502 |
Low noise charge ramp electrometer |
Oct. 6, 1992 |
| 5146155 |
Digital measuring circuit for measuring an electrical signal |
Sep. 8, 1992 |
| 5101832 |
Method and apparatus for making electrical measurements in the presence of periodic electromagnetic fields |
Apr. 7, 1992 |
| 5079509 |
Scale for a measuring instrument |
Jan. 7, 1992 |
| 4987902 |
Apparatus for transmitting patient physiological signals |
Jan. 29, 1991 |
| 4959608 |
Apparatus and method for extracting the RMS value from a signal |
Sep. 25, 1990 |
| 4949274 |
Test meters |
Aug. 14, 1990 |
| 4942401 |
Analog to digital conversion with charge balanced voltage to frequency converter having polarity responsive offset |
Jul. 17, 1990 |
| 4935692 |
Vector ammeter having digital signal processing unit |
Jun. 19, 1990 |
| 4926174 |
Digital voltmeter |
May. 15, 1990 |
| 4926360 |
Electronic gage amplifier and display |
May. 15, 1990 |
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