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7591165 |
Control circuit for sensor array and related methods
A control circuit for scanning a pressure or force responsive sensor array is disclosed. Pressure or force sensors formed of an array of pressure or force responsive sensor elements can be used to...
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7583088 |
System and method for reducing noise in sensors with capacitive pickup
An apparatus and method are provided for reducing noise in a capacitive sensor ( 200 ). One apparatus includes a gain stage ( 210 ) including an output, the gain stage configured to generate a...
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7436188 |
System and method for improving time domain processed sensor signals
Noise discrimination in signals from a plurality of sensors is conducted by enhancing the phase difference in the signals such that off-axis pick-up is suppressed while on-axis pick-up is enhanced....
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7345490 |
Filter calibration
A method for calibrating a filter begins with the filter filtering a first signal having a first frequency to produce a first filtered signal, wherein the first frequency is in a known pass region...
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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...
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7235979 |
Apparatus and method for measuring loop insertion loss single-endedly
The system and method of determining insertion loss of a telephone line under test (LUT) determines a first insertion loss as a function of plurality of different equivalent circuit values of the...
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7002357 |
Method and apparatus for phase calculation from attenuation values using a Hilbert transform for FDR measurements
The invention concerns a method and a device for phase calculation from attenuation values using a Hilbert transform for reflectometric measurements in the frequency domain. The invention is...
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6914437 |
Filter calibration and applications thereof
A method for calibrating a filter begins with the filter filtering a first signal having a first frequency to produce a first filtered signal, wherein the first frequency is in a known pass region...
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6864689 |
Determining cable attenuation and loss of signal threshold
Attenuation of a pulsed signal traversing a cable is assessed by identifying a pulse in a signal received after traversing the cable and determining first and second reference signal levels in...
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6844740 |
Measuring a signal using a programmable gain amplifier
Measuring a signal includes setting a gain numerator of a gain value and setting a gain denominator of the gain value, where the gain value is a ratio of the gain numerator to the gain denominator....
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6819119 |
Method for evaluating a crystalline semiconductor substrate
In a method for evaluating a crystalline semiconductor substrate which includes a collector layer, a base layer, and an emitter layer and is used for a heterojunction bipolar transistor, a layer is...
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6745137 |
Single ended attenuation measurement
A signal-based cable attenuation measurement device, system and methodology provides measurement of attenuation characteristics of a cable over a wide frequency spectrum. Located at a single...
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6744261 |
Method and an apparatus for measuring the ratio of the amplification factor of a signal level normalizer
An apparatus and method of determining the ratio of an amplification factor before and after changing the amplification factor of a signal normalizer that amplifies the voltage amplitude of signals...
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6731681 |
Method for determining the frequency instability noise from a source and a device for implementing the method
A method and device for measuring frequency instability noise ΔT RMS from a source includes measuring the signal to noise ratio SRN 1 at the output from a circuit having an input to receive a...
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6687289 |
Method for measuring the attenuation in digital transmission lines
A method for measuring the attenuation in digital transmission lines between a switching center and a subscriber station, with a first pulse of a known frequency spectrum being sent from the...
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6661217 |
Wideband precision current sensor
A wideband precision current sensor employs DC-coupled and AC-coupled sensing circuits to generate lower and higher frequency sense signals; which are combined to form a wideband output signal that...
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6606583 |
Real-time error-suppression method and apparatus therefor
A thorough error suppression signal measurement system (20) having a transmitter (300) for propagating a transmission signal to a first probe 100, through a device under test (26), and into a...
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6496017 |
Measuring antenna signal strength with automatic gain control receiver
Apparatus and method for measuring an antenna signal strength (X). The apparatus includes a first amplifier section ( 3 ) for receiving an antenna signal and having a first automatic gain control...
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6144265 |
Calibrated high power radio frequency step attenuator
A high power radio frequency(RF) precision step attenuator includes a trim attenuator, a multi-step attenuator and a calibration/control circuit. The control circuit includes a memory for storing...
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6114858 |
System for measuring noise figure of a radio frequency device
Noise factor of a radio-frequency device under test (DUT) is determined by driving the input of the DUT with a randomly modulated sine wave and measuring the power of a resulting DUT OUTPUT signal...
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6104197 |
Apparatus for acquiring waveform data from a metallic transmission cable
An apparatus for acquiring waveform data from a metallic transmission cable under test includes a transmitter for generating interrogating pulses for examining a segment or segment lengths of the...
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5783977 |
Tunable and bandwidth programmable multi-element filter system
A method and apparatus which realize an RF bandpass filter having a tunable bandwidth and center frequency over a large range of the radio frequency spectrum. The filter is comprised of a cascade...
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5698985 |
Cross-talk measurement instrument with source indication as a function of distance
A pulse-based LAN cable test instrument that processes time-domain cross-talk measurement information in order to troubleshoot and quickly locate sources of cross-talk as a function of distance...
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5594350 |
Signal detecting circuit for digital controller
An instantaneous value of alternating current signal from an instrument potential transformer 10 or an instrument current transformer 9 is processed with an analog filter 21, 22, the frequency to...
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5548222 |
Method and apparatus for measuring attenuation and crosstalk in data and communication channels
A termination control circuit is coupled to a far end of a cable. A modulated test signal is reflected back to a near end of the cable at a different frequency but at substantially the same level...
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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...
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5404109 |
Method and apparatus for testing circuits containing active devices
A test system for measuring the characteristics of an active circuit employs a pulsed bias technique for periodically biasing the input control port of the active circuit into the active region of...
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5402073 |
Near-end communications line characteristic measuring system with a voltage sensitive non-linear device disposed at the far end
A method and apparatus (3, 60, 202, 300) for measuring the dynamic, or alternating current, and static, or direct current, characteristics of a cable pair (2, 10, 24, 133) from one end, the local...
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5317273 |
Hearing protection device evaluation apparatus
A portable hearing protection device evaluation apparatus which can be taken into the field to measure noise attenuation of a muff type hearing protection device under actual working conditions is...
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5245630 |
Equalized eye pattern instrument
An equalized eye pattern instrument inserts an equalizer between the input of the instrument and a display device for the instrument. The equalizer compensates for losses and other distortions in a...
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5083080 |
High frequency signal measuring equipment with cabled detecting and signal companding
A signal detector includes a signal input section, a detector, and a converter. The signal input section inputs a high frequency signal to be measured. The detector detects the high frequency...
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5068616 |
Monitoring process and device of a quasi-closed electromagnetic shield
An emitter assembly of low-power electromagnetic signals with random or pseudo-random frequency variation is located inside an electromagnetic shield to be monitored. These signals are detected by...
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5059915 |
Vector network analyzer RF pulse profiling method and apparatus
A vector network analyzer comprising a circuit for measuring the real and imaginary components of the central spectral line in an RF pulse from a device-under-test is provided. The circuit...
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4896118 |
Variable gain current-to-voltage amplifier with gain independent test mode operation
The present invention provides a precision variable gain current-to-voltage amplifier which has a test mode of operation wherein the gain is independent of the gain of the amplifier when operated...
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4797627 |
Programmatically generated in-circuit test for general purpose operational amplifiers
A device and process for programmatically generated and controlled in-circuit pin tests and gross functionality tests of operational amplifiers. The tests provide basic functionality verification...
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4745353 |
In situ BS&W measurement
A centrifugal filter element is inserted into a pipeline to provide a dry oil stream for analysis. A moisture sensing probe is inserted along the central axis of the centrifugal filter to sense the...
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4663586 |
Device with automatic compensation of an ac attenuator
An ac measuring instrument automatically compensates an input attenuator to achieve precision frequency response. The output of the input attenuator is applied to both the conventional measurement...
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4647845 |
Apparatus and method for utilizing an AC detection scalar network analyzer with a CW signal source
A method and apparatus for using an AC detection network analyzer with either a pulsed RF or a CW source signal is disclosed. An AC/DC detector is placed between an AC detection network analyzer...
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4507606 |
Device for measuring the variations in the gain of a laser amplifier as a function of the pumping energy and a process utilizing this device
Device for measuring variations of the gain of a laser amplifier at a particular wavelength, as a function of a pumping energy, said device comprising a source supplying continuous light radiation...
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4491783 |
Apparatus for measuring noise factor and available gain
Disclosed is a noise factor and available gain measuring apparatus in which a first noise source is connected to a first port of a circulator through a device under test, a second noise source is...
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4275446 |
Method and apparatus for measurement of attenuation and distortion by a test object
A method for measurement of transmission characteristics consists of supplying a test pulse to an object under test and measuring the pulse at the output of the object under test with the...
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4259631 |
Method and arrangement for measuring the attenuation-versus-frequency characteristics of two-ports
A method and device for quickly performing simple frequency-response measurements on two-ports. A controllable-frequency constant-output-voltage A.C. voltage generator has its output connected to...
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4219770 |
Insertion loss and phase shift measurement system and method
Insertion loss measurement at microwave frequencies is achieved using an improved IF substitution technique wherein the IF test signal is applied to a feedback loop which generates a feedback...
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4103223 |
Closed loop for automatic substitution of a signal of equal amplitude
A device for testing the accuracy of an attenuator, over a range of frequencies from 1 to 18 GHz, for example, and having a first variable frequency signal generator which passes its output through...
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4061892 |
Instruments and methods for measuring characteristics of only a selected portion of a transmission channel
There are disclosed instruments and methods for facilitating the measurement of characteristics of only a selected portion of a transmission channel. In my copending application Ser. No. 661,106,...
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4032716 |
Measurement of noise in a communication channel
A measure of the noise performance of an FDM system can be made by making measurements when the system is carrying traffic. The technique consists of creating a quiet channel in the system, and...
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3920935 |
Method for measuring the frequency-dependent attenuation of a telecommunications line, especially a two-wire line
A method for measuring the frequency-dependent attenuation of a telecommunications line, particularly a two-wire line, in both traffic directions, from one line end. Measurement voltages having...
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3904959 |
Swept frequency measurement system
A calibration curve for a test circuit alone is first memorized by the system and is then automatically subtracted from subsequent response measurements of a test device placed in the test circuit...
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3899738 |
System for measuring group delay and/or attenuation in closed signal-transmission loop
Several measuring stations are linked with one another by line segments enabling signal transmission thereover in a closed loop, each station including a receiving section and a transmitting...
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3848185 |
CIRCUIT ARRANGEMENT FOR DETERMINING THE VOLTAGE FRACTION RATIO OF A VOLTAGE DIVIDER
A circuit arrangement for determining the ratio of a voltage divider including two impedances joined at a junction and said impedances including reactance components and including resistance...
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