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| Number | Title | Issue Date |
| 7394773 | Network bridge uplink port identification An ICMP ping is sent from a test instrument to all known bridges and switches on a network, which respond by populating the forwarding data base (FDB) tables with the MAC addresses of adjacent bridges. Then an SNMP query is sent to the FDB table of a selected bridge... | 07/01/2008 |
| 7295018 | Correction of loss and dispersion in cable fault measurements A method of correcting distortions resulting from loss and dispersion in cable fault measurements. A cable is measured in the frequency domain to obtain a reflected response. Fractional sinusoidal components of the reflected response having attenuated amplitude and ... | 11/13/2007 |
| 7242173 | Combined test instrument probe and voltage detector A voltage detector is combined with a test instrument probe to provide an indication of the presence of a.c. voltage when the test instrument probe approaches or comes in contact with a source of a.c. voltage. ... | 07/10/2007 |
| 7034517 | Multimeter with filtered measurement mode A multimeter with a filtered measurement mode. By pressing a single button or key, a low-pass filter is switched into the signal path to filter voltage spikes, noise, and switching transients from pulse-width modulated pulses, or lower frequency sinusoidal signals w... | 04/25/2006 |
| 6989892 | Optical fiber propagation time measurement An optical fiber propagation time measurement circuit. A light pulse is iteratively transmitted into a near end of a fiber under test (FUT) at a predetermined frequency and detected at a far end of the FUT after a propagation time. A repetitive propagation signal ha... | 01/24/2006 |
| D511700 | Tone-generating probe | 11/22/2005 |
| D510533 | Network cable certification instrument | 10/11/2005 |
| 6566994 | Coil for an AC current sensor An improved formable coil for an AC sensor having a predetermined length and a predetermined number of turns. The coil is wound in multiple passes in opposite directions, with a predetermined number of passes in each direction to fill in any gaps and prov... | 05/20/2003 |
| 6469492 | Precision RMS measurement A precision RMS measurement system is provided by extending the effective resolution of a medium-resolution sampling RMS converter. An AC or other time-varying cyclic signal is simultaneously applied to an average-responding AC-to-DC converter and to a hi... | 10/22/2002 |
| 6293700 | Calibrated isothermal assembly for a thermocouple thermometer A calibrated isothermal assembly for a thermocouple thermometer is provided to obviate a calibration step after manufacture of the instrument. A compact isothermal block is fabricated on a specialized printed circuit board which includes a thick metal pla... | 09/25/2001 |
| 6275047 | Capacitance measurement An improved capacitance measurement system employs a selectable constant current source which is switched into a capacitor in a charge measurement system. The capacitor produces a linear ramp voltage in response to the constant current. An analog-to-digit... | 08/14/2001 |
| 6191723 | Fast capacitance measurement A method of measuring capacitance is provided in which measurement speed is increased by as much as two orders of magnitude by optimizing timing parameters to rapidly charge and discharge the capacitor in small increments about an equilibrium voltage. The... | 02/20/2001 |
| 6094949 | Lock device for electronic test apparatus A lock device for electronic apparatus is provided as a non-intrusive and removable attachment, The lock device has an actuating member that translates linear movement along a longitudinal axis to linear movement of a pair of retractable lugs along a tran... | 08/01/2000 |
| 6064372 | Touchscreen display system for a test instrument A graphical user interface implemented with touchscreen technology with associated indicators for a test instrument is provided. A set of indicators is mounted around the periphery of the touchscreen display so that each indicator is associated with a set... | 05/16/2000 |
| 6043640 | Multimeter with current sensor A multimeter having an elongated housing with a fixed recess for receiving a current-carrying conductor is provided. The multimeter is adapted to measure various parameters including a.c. and d.c. voltage, resistance, and a.c. current. On one end of the e... | 03/28/2000 |
| 5998985 | Voltage indicator using serial comparison voltage measurement A voltage indicator using a serial or sequential comparison voltage measurement technique. Reference voltages generated by a voltage divider are applied to inputs of a multiplexer which is driven by a counter to select one reference voltage at a time in s... | 12/07/1999 |
| 5939890 | Tweezer probe and arm therefor A tweezer probe comprises a pair of arms (10) each made of a multi-layer printed circuit board. The outer conductive layers (20, 32) on each arm are etched to form a shield region (36) and a tip contact (34). The tip contacts (34) are connected to inner c... | 08/17/1999 |
| 5929842 | Method and apparatus for improving time variant image details on a raster display A method of displaying digital samples with enhanced image details on a raster display using a limited set of brightness values is provided. Digital samples are interpolated and stored as pixel information in high resolution intensity memory. An adaptive ... | 07/27/1999 |
| 5920188 | Voltage measurement instrument having transient overvoltage input protection A voltage measurement instrument such as a digital multimeter is provided with transient overvoltage input protection. Internal walls are integrally molded with the instrument case and disposed in close proximity to the input receptacles and terminals to ... | 07/06/1999 |
| 5914612 | Tweezer probe and arm therefor A tweezer probe comprises a pair of arms (10) each made of a multi-layer printed circuit board. The outer conductive layers (20,32) on each arm are etched to form a shield region (36) and a tip contact (34). The tip contacts (34) are connected to inner co... | 06/22/1999 |
| 5872592 | Test signals and test signal generators A test pattern produced by a television signal generator includes picture elements derived at least substantially from helper lines, and vertically adjacent picture elements of substantially different luminance derived at least substantially from the main... | 02/16/1999 |
| 5841251 | Test signals and test signal generators for use with PAL plus televisions A test pattern is suitable for a television signal decoder which detects changes in the color content of a signal from frame to frame, and on the basis of these changes attenuates high frequency luminance components, and possibly switches its output betwe... | 11/24/1998 |
| 5821760 | Method and apparatus for measuring near-end cross-talk in patch cords A pulse-based local area network (LAN) cable test instrument provides a measurement of the cross-talk characteristic of a LAN patch cord as a function of frequency in order to evaluate its relative performance and workmanship of assembly. A LAN cable test... | 10/13/1998 |
| 5812112 | Method and system for building bit plane images in bit-mapped displays In a measurement instrument, a display processor system and method for efficiently building a display image on a bit-mapped liquid crystal display are provided. The display processor system contains a set of bit plane images corresponding to predetermined... | 09/22/1998 |
| 5809446 | Instrument for measuring fuel injection time A test instrument for measuring the injection time of different types of electronic fuel injectors in a fuel injected engine is provided. The test instrument is coupled to receive an injection signal from any of a variety of fuel injector types and over a... | 09/15/1998 |
| 5790480 | Delta-T measurement circuit A method and apparatus for measuring very short time periods, or differences between two events, such as the delta-T between a trigger point on a waveform and a sampling clock edge of a digital oscilloscope. The delta-T measurements are made using the tim... | 08/04/1998 |
| 5691635 | Probe identification system for a measurement instrument An auxiliary device (such as probe or the like) identification system for measuring instruments (such as oscilloscopes or voltmeters or the like) incorporates a commercially-available containing stored personality identification information, that is inter... | 11/25/1997 |
| 5663680 | Chopper stabilized amplifier having an additional differential amplifier stage for improved noise reduction A chopper-stabilized amplifier having an additional differential amplifier stage for improved noise reduction. A main amplifier provides a fast AC path, while a nulling amplifier is used to zero out input offset voltages of both the main amplifier and its... | 09/02/1997 |
| 5647515 | Stepping plunger for air-activated dispensing system An dispensing system is provided with a stepping plunger to minimize the air buffer at develops as material is dispensed. The stepping plunger includes a plunger body having an air passage therethrough for insertion into a syringe containing a material to... | 07/15/1997 |
| 5570029 | Cable crosstalk measurement system A cable crosstalk measurement system provides fault diagnostic information to locates faults in addition to providing a crosstalk versus frequency function to test and troubleshoot LAN cables. In a preferred embodiment, a narrow pulse is introduced into o... | 10/29/1996 |
| 5565869 | Multiple slope analog-to-digital converter having increased linearity A multiple slope integrating analog-to-digital converter (ADC) includes an integrator and a comparator in which an input voltage to be measured is applied to a summing node at the input of the integrator during an integrate cycle, while at the same time p... | 10/15/1996 |
| 5530367 | Pulse based cable attenuation measurement system A pulse-based cable attenuation measurement system provides a measurement of attenuation characteristics of a cable over a wide frequency spectrum. A main test and troubleshooting unit of a cable test instrument applies stimulus signals via a selected one... | 06/25/1996 |
| 5485115 | Impedance synthesizer An impedance synthesizer includes an amplifier with selectable gain and a reference capacitor, resistor, or inductor for providing a plurality of synthesized impedance values. The voltage gain of the amplifier is controlled by a programmable multiplying d... | 01/16/1996 |
| 5446371 | Precision analog-to-digital converter with low-resolution and high-resolution conversion paths An analog-to-digital converter utilizes low-resolution and high-resolution conversion paths for precision voltage measurements. A first conversion made using a comparatively low resolution ADC is used to predict the reference voltage to one input of a nul... | 08/29/1995 |
| 5440528 | Dual time base zero dead zone time domain reflectometer A dual time base, zero dead zone time domain reflectometer repetitively launches a predetermined number of stimulus pulses into a transmission system in synchronism with clock signals from a first time base, providing a measurement cycle. The duration of ... | 08/08/1995 |
| 5436555 | LAN cable identifier for testing local area network cables A LAN cable identifier for testing and identifying copper-conductor LAN cables in conjunction with a LAN cable test instrument is provided. Series combinations of resistors and diodes allow for both resistance measurements and polarity determinations for ... | 07/25/1995 |
| 5424677 | Common mode error correction for differential amplifiers Common mode error correction for differential amplifiers involves accurately measuring both the input and output of an amplifier using a low-leakage measurement path, and calculating common-mode gain. Two measurements are made at each node by appying two ... | 06/13/1995 |
| 5402082 | Voltage and resistance synthesizer using pulse width modulation A voltage and resistance synthesizer includes a pulse width modulator (PWM) for synthesizing voltage and resistance values at a pair of terminals. A selector switch selects between a resistance synthesis mode, in which resistance values are synthesized fr... | 03/28/1995 |
| 5397981 | Digital storage oscilloscope with automatic time base A digital storage oscilloscope capable of acquiring and displaying input signals over a wide range of frequencies, and automatically establishing, by menu setups or user selection, any of a number of cycles of an input signal for viewing. An input analog ... | 03/14/1995 |
| 5382910 | Dual time base zero dead zone time domain reflectometer A dual time base, zero dead zone time domain reflectometer repetitively launches a predetermined number of stimulus pulses into a transmission system in synchronism with clock signals from a first time base, providing a measurement cycle. The duration of ... | 01/17/1995 |
