Test equipment is everywhere. Every trade show has it regardless of the focus. Power is no exception. At APEC 2024, EE World visited several booths displaying test equipment: meters, oscilloscopes, source-measure units (SMUs), bench power supplies, … [Read More...] about APEC 2024: Test equipment
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FROM THE EDITORS
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Aimee Kalnoskas
Function, arb generators and multimeters enhance test equipment lines -
Martin Rowe
APEC 2024: Test equipment -
Rick Nelson
Why does the Fourier transform provide apparently inaccurate results, and what can I do about it? Part 4 -
Emma Lutjen
Moku product line enhanced with added instrument -
Kenneth Wyatt
How to separate differential and common-mode harmonic noise currents
Today on Test & Measurement Tips
- APEC 2024: Test equipment
- Function, arb generators and multimeters enhance test equipment lines
- Why does the Fourier transform provide apparently inaccurate results, and what can I do about it? Part 4
- Perform phase noise and VCO measurements to 50 GHz
- Test equipment line expanded to include AWG featuring 500 MHz frequency
- Digital oscilloscopes offer up to 2GSa/s sampling rate, 56Mpts memory depth
FAQs
Why does the Fourier transform provide apparently inaccurate results, and what can I do about it? Part 4
The FFT can measure phase angle, but what appears to be a meaningful result might just be the arctangent of a ratio of rounding errors. Throughout this series, we reviewed the fast Fourier transform (FFT) as implemented in Microsoft Excel and investigated windowing functions. In this final part, … [Read More...] about Why does the Fourier transform provide apparently inaccurate results, and what can I do about it? Part 4
How to separate differential and common-mode harmonic noise currents
Differential-mode and common-mode currents can cause your product to produce radiated and conducted emissions. These three techniques can help you measure them. If you've dealt with EMC issues for any length of time, you've probably run into the term "common mode currents," which often lead to … [Read More...] about How to separate differential and common-mode harmonic noise currents
Why does the Fourier transform provide apparently inaccurate results, and what can I do about it? part 3
Windowing functions account for mismatches between an input signal and FFT sample size. We concluded part 2 of this series with a look at fast Fourier transforms (FFTs) of 39.1-Hz and 38.12-Hz cosine waves, with our sample size N = 512 and our sample interval Δt = 1 ms (Figure … [Read More...] about Why does the Fourier transform provide apparently inaccurate results, and what can I do about it? part 3
Why does the Fourier transform provide apparently inaccurate results, and what can I do about it? part 2
A bare-bones implementation of the Fast Fourier Transform helps illuminate how to extract frequency information from input data samples. In part 1 of this series, we reviewed the discrete Fourier transform (DFT) and manually calculated one DFT shown in Table 1. Table 1. Manual DFT … [Read More...] about Why does the Fourier transform provide apparently inaccurate results, and what can I do about it? part 2
Review: Electronic bug and hidden camera detectors
Do you want assurance that cameras embedded in everyday devices don't spy on you? Then you should check for cameras, SD card slots, and Wi-Fi-connections. We reviewed two devices that help you find those lurking spies. While discovering a hidden camera in an Airbnb, VRBO, or hotel is rare, there … [Read More...] about Review: Electronic bug and hidden camera detectors
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What is the importance of resolution in an oscilloscope?
When looking at the oscilloscope feature of a multi-instrument device or when comparing two benchtop oscilloscopes, the first specifications that we look at are the bandwidth and sample rate. While these are incredibly important specs, often most design work is done well within the limits of most products and the more critical specification to consider is resolution. Did you know that while most […]