A test system includes a test and measurement instrument having one or more inputs for receiving one or more signals to be measured or tested, a display for outputting measurement results or test results, one or more processors for operating the instrument, a chassis housing the instrument, a power connection to receive power for powering the one or more processors from a wall connection. The test system further includes an external battery pack separate from the test and measurement instrument and structured to mechanically and electrically couple to and decouple from the test and measurement instrument, the external battery pack including a DC power source for powering the one or more processors. The test and measurement instrument includes no batteries or other power storage device for powering the one or more processors within the chassis of the instrument.

A test and measurement device has an input port configured to receive a signal from a device under test, the signal having a symbol rate, one or more analog-to-digital converters to convert the signal to waveform samples at a sampling rate, and one or more processors configured to execute code that, when aliasing is present in the waveform samples, causes the one or more processors to: up-sample the waveform samples to produce up-sampled samples; use the up-sampled samples to produce a real-time waveform; perform clock recovery on the real-time waveform to produce a recovered clock; and resample the waveform samples using the recovered clock to produce a non-aliased waveform. A method of acquiring a waveform in a test and measurement device includes receiving a signal from a device under test, the signal having a symbol rate, converting the signal to waveform samples at a sampling rate of the test and measurement device, when aliasing is present in the waveform samples, up-sampling the waveform samples to produce up-sampled samples, using the up-sampled samples to produce a real-time waveform, performing clock recovery on the real-time waveform to produce a recovered clock, and resampling the waveform samples using the recovered clock to produce a non-aliased waveform.

The invention relates to an electrical, preferably portable and battery-powered, measurement device. The device comprises: an electrical measurement unit supplying electrical measurement signals, a processing unit processing said electrical measurement signals, a memory, and a display controlled by the processing unit and displaying the processed electrical signals, wherein the processor is arranged to execute an operating system stored in the memory, and wherein the in the memory furthermore a local web browser application is stored which can be executed by the processor in order to control the display.

A device includes a control circuit, a scope circuit, a first logic gate and a second logic gate. The control circuit is configured to generate a first control signal according to a voltage signal and a delayed signal. The scope circuit is configured to generate a first current signal in response to the first control signal and the voltage signal. The first logic gate is configured to perform a first logical operation on the voltage signal and one of the voltage signal and the delayed signal to generate a second control signal. The second logical gate configured to perform a second logical operation on the second control signal and a test control signal to generate a second current signal.

A leakage electric field measurement device includes a first acquirer that measures a distance to an electric wire, a second acquirer that measures a leakage electric field of the electric wire, a third acquirer that acquires a captured image of the electric wire, and a controller that calculates a predicted value of the leakage electric field of the electric wire on the basis of the distance measured by the first acquirer and the leakage electric field measured by the second acquirer, performs determination of whether or not the electric wire is a live wire according to comparison between an assumed electric field of the electric wire and the predicted value, and generates a composite image in which a result of the determination is superimposed on the captured image acquired by the third acquirer.

A method, a system, and a computer program for executing high resolution spectrum monitoring. A sensor receives an input signal having a varying frequency content over time. One or more samples of the received input signal are sampled. The samples of the received input signal include one or more swept signal samples generated by sweeping, using a center frequency of the sensor, the received input signal across an entire frequency spectrum associated with the received input signal. Sampling of the samples of the received signal is performed while performing the sweeping. The signal samples are processed.

A method and system are provided for reducing noise in a time domain waveform of a signal under test (SUT). The method includes performing cross-correlation of multiple first complex signals and multiple second complex signals, respectively, from the SUT to provide multiple cross-correlated signals, respectively, where the cross-correlated signals have amplitude components and no phase components from the SUT, and where the first and second complex signals include uncorrelated noise, respectively. The method further includes determining an average of the cross-correlated signals to provide an average cross-correlated signal with reduced uncorrelated noise; obtaining a representative phase component from one of the first complex signals or the second complex signals; and combining the representative phase component with the average cross-correlated signal to provide a representative complex signal corresponding to the SUT with reduced uncorrelated noise.

An inertial measurement system includes three acceleration sensors detecting along three orthogonal axes, a display having several display areas, and a processor programed to perform a process. The processor calculates frequencies and spectral intensities of vibrations based on detected time series accelerations by three acceleration sensors and obtains relationship values between the calculated frequencies and the calculated spectral intensities. The processor causes the display to successively display an N-th value, intermediate values, and an (N+1)-th value of the relationship values at one display area in time series.

The method allows the measurement of the audio signal-to-noise ratio, without having to interrupt the transmission to make the measurements. The method comprises: taking the audio signal processed by the system in a frequency hand (ΔF) for a predefined 5 measurement time period (T1); Fast Fourier Transform the sampled audio signal to obtain a signal power spectrum for the entire frequency band (ΔF); for each frequency (F), detect and store the maximum (PMax) and minimum (PMin) power values relating to each frequency considered with operations of “MaxHold” and “MinHold”, to obtain 10 corresponding sequences, respectively of maximum power (CMax) and minimum power (Cmin) of the audio signal; for each frequency (F), obtain the signal/audio noise ratio (S/N) of the signal as a function of the corresponding values of said sequences (CMax) and (CMin). 15

A digital data rate enhancement filter is described. The digital data rate enhancement filter-includes an enhancement filter input, a first interpolation filter, a second interpolation filter, and a multiplexer circuit. The first interpolation filter is connected to the enhancement filter input downstream of the enhancement filter input. The second interpolation filter is connected to the first interpolation filter downstream of the first interpolation filter. The enhancement filter input is configured to receive a digital input signal set. The first interpolation filter is configured to receive the digital input signal set and to interpolate the digital input signal set, thereby obtaining a first interpolated signal set. The second interpolation filter is configured to receive the first interpolated signal set and to interpolate the first interpolated signal set, thereby obtaining a second interpolated signal set. The multiplexer circuit is configured to selectively receive the first interpolated signal set and/or the second interpolated signal set. The multiplexer circuit further is configured to output the first interpolated signal set and/or the second interpolated signal set received. Further, a digital data rate reduction filter and a digital oscilloscope are described.