Arthur Pini

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Articles

示波器的選擇性平均技術 - 電子技術設計

1 week ago | edntaiwan.com | Susan Hong |Arthur Pini

作者 : Arthur Pini 如何運用示波器的Pass/Fail測試與遮罩功能，進行選擇性平均處理？針對特定訊號成分的平均處理有時，我們只想分析特定條件下的訊號成分，例如在擷取期間內於某些特定時間點發生的訊號。對單一次擷取資料來說這並不困難，但若你希望針對這些特定事件的多筆資料進行平均，問題就變得比較複雜了。在這種情況下，示波器中看似無關的功能，事實上可以互相配合達成目標。以某裝置產生週期性射頻(RF)脈衝為例，如圖1所示：圖1：待測裝置會產生週期性RF脈衝；測試目標為擷取並平均具有特定振幅的脈衝。(來源：Arthur Pini) 這一測試的目標是僅擷取並平均那些具有特定振幅的脈衝訊號。在此例中，為峰對峰值(peak-to-peak；Pk-Pk)約為300mV的脈衝。這可透過示波器的通過/失敗測試(Pass/Fail Testing)功能來達成。 Pass/Fail測試允許使用者依據波形的參數性質(如振幅)進行測試，判斷該波形是否落在預先設定的合格區間；或是，透過與遮罩模板(mask...
How to Minimize Noise and Interference in Oscilloscopes and Digitizers

Oct 29, 2024 | ednasia.com | Arthur Pini

Article By : Arthur Pini Here are some techniques for minimizing the effects of noise in measurements with digitizing instruments such as averaging and filtering. Even in the best designs, noise and interference sneak in to reduce the signal-to-noise ratio (SNR), obscure desired signals, and impair measurement accuracy and repeatability.
Combating noise and interference in oscilloscopes and digitizers

Oct 15, 2024 | edn.com | Arthur Pini

Even in the best designs, noise and interference sneak in to reduce the signal-to-noise ratio (SNR), obscure desired signals, and impair measurement accuracy and repeatability. Digitizing instruments like oscilloscopes and digitizers incorporate many features to characterize, measure, and reduce the effects of noise on measurements. Every measurement includes the signal of interest and a collection of unwanted signals such as noise, interference, and distortion.
Custom measurements using waveform and parameter math

Aug 5, 2024 | edn.com | Arthur Pini

Oscilloscope measurement parameters provide accurate measurements of acquired waveforms. Most digital oscilloscopes offer around twenty-five standard parameters like frequency, peak-to-peak amplitude, and RMS amplitude. What if you need a measurement parameter that is not in the standard measurement package? Most oscilloscope manufacturers keep alert for these opportunities and offer specialized software analysis packages with optional application-specific parameters.
Oscilloscope special acquisition modes

Jun 11, 2024 | edn.com | Arthur Pini

Digital oscilloscopes are normally operated in real-time acquisition mode, where the analog input is sampled and digitized at a user-selected sampling rate and written continuously into the acquisition memory. There are, however, other acquisition modes available in most oscilloscopes: random interleaved sampling (RIS), sequence mode, and roll mode (Figure 1).
Measuring pulsed RF signals with an oscilloscope

Apr 16, 2024 | edn.com | Arthur Pini

RF signals historically are measured using spectrum analyzers, at least that was before oscilloscopes offered sufficient bandwidth for those measurements. With oscilloscope bandwidths over 100 GHz, RF measurements are no longer the exclusive domain of the spectrum analyzer; this is especially true for pulsed RF measurements, where the time domain measurements of an oscilloscope have several advantages. This article will focus on the time measurements of pulsed RF signals.
Oscilloscope persistence displays

Feb 12, 2024 | edn.com | Arthur Pini

Persistence displays retain waveform traces on the screen, allowing them to decay over a user set time duration, they allow users to see a history of signal variations on the screen. This feature is very useful if you are adjusting a signal, as it allows you to see the changes as they are made. Some oscilloscope applications require displaying a history of events in order to see how the signal varies over time.
Achieve better measurements with oscilloscope filters

Dec 18, 2023 | ednasia.com | Arthur Pini

Article By : Arthur Pini Using scope filters such as the input band limit and noise filters, enhanced resolution digital filters, and general-purpose digital filters. Most oscilloscopes are fitted with filters to help improve measurement by reducing overall noise in an acquisition to improve signal-to-noise ratio (SNR). Even the most basic oscilloscopes include an analog 20 MHz low pass filter in the input channel signal path.
Using oscilloscope filters for better measurements

Dec 6, 2023 | edn.com | Arthur Pini

Most oscilloscopes are fitted with filters to help improve measurement by reducing overall noise in an acquisition to improve signal-to-noise ratio (SNR). Even the most basic oscilloscopes include an analog 20 MHz low pass filter in the input channel signal path. High end oscilloscopes with a GHz or better bandwidth generally offer multiple input low pass filters, some analog and some digital.
Arbitrary waveform generator waveform creation using equations

Oct 17, 2023 | ednasia.com | Arthur Pini

Article By : Arthur Pini This article provides examples of waveform creation techniques for arbitrary waveform generators using equations. An arbitrary waveform generator (AWG) is a powerful and flexible signal source capable of generating any wave shape within the bandwidth and amplitude range of the generator. Populating an AWG with precise and accurate waveforms can be a major challenge. Every AWG supplier offers tools, like waveform creation software, to make this task easier.