Design Con 2015

MeasurementBlues

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Senior Technical Editor

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MeasurementBlues

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  • 10.18.2013
  • Try an oscilloscope for under $200
  • If the SmartScope lives up to the claims, Oscium will have a hard time charging higher prices for just 5 MHz of bandwidth.
  • 11.16.2014
  • Software option multiplies oscilloscope vertical resolution
  • I asked R&S about how they get 16 bits. US oscilloscope product manager Rich Markley replied, Q: Is it really 16 bits or is the performance enhancement done through software? How is it that performance is not slower at the higher resolution? A: It is up to 16bits that we achieve through bandwidth filtering to improve our signal to noise ratio and give more effective bits. The performance isn't compromised because we do the bandwidth filtering in hardware. There are two other significant benefits: 1. Unlike a high resolution mode that uses box car averaging of sample points to get higher resolution, our method maintains our high sample rate that helps prevent aliasing and maintains high sample resolution. 2. The filtering is done prior to our digital trigger which means we can trigger on the higher resolution data unlike other higher resolution methods. This is extremely powerful as our digital trigger allows very high sensitivity (down to 0.04div) which combined with the high definition mode allows for triggering on signals that hasn't been available before.
  • 11.13.2014
  • How to measure the world's fastest power switch
  • Steve, DC-DC switching frequencies of 250 MHz might improve efficiency, but what about EMI or signal/power-integrity problems? The fifth harmonic of 250 MHz is 1.25 GHz. That's getting up there.
  • 12.13.2013
  • Sports should adopt real technology
  • I heard something on the radio today about a sensing technology that lets refs find the location of the ball when it's under a pile of bodies. I'll try to find a link. In the meantime, see this link. http://engineeringsport.co.uk/2012/03/13/sensor-sensor-in-a-ball-which-is-the-best-goal-line-technology-of-them-all/ It's about that other game called football.
  • 10.29.2014
  • Design for test boot camp, part 1: Scan test
  • Alan, If you do a search on EDN for DFT, you will see both design for test and discrete Fourier Transform. Note the "discrete" uses a lowe case, same as in FFT (fast Fourier transform) The important thing is the the acronym is defined on first use in an article, as done here. When I was at Test & Measurement World, we always used DFT for both but, it was always defined on first use, which was our editorial standard. I've continued that convention. There are other acronyms that had more than one meaning, take IP. It can stand for intellectual property or internet protocol. The solution again is define on first use. TMW and EDN had different conventions for FFT, as in fast Fourier Transform and fast Fourier Transform. TMW used "fast" and EDN used "Fast." Now that the TMW content is merged with EDN, we have both conventions. We also had different conventions for using a space between an value and its unit. TMW always used a space, as in "50 Ω" but EDN sometimes used a space and sometimes not. If the unit had some character, then no space as in 50Ω but more than one character got a space, as in 10 mA. I follow the TMW convention and always use a space.
  • 11.01.2014
  • Book Review: Power Integrity
  • More articles by Steve Sandler Match impedances when making measurements http://ubm.io/1oIAhcR SPICE models need correlation to measurements http://www.edn.com/design/test-and-measurement/4430457/SPICE-models-need-correlation-to-measurements Measure small impedances with Rogowski current probes http://www.edn.com/design/test-and-measurement/4427931/Measure-small-impedances-with-Rogowski-current-probes
  • 11.01.2014
  • Book Review: Power Integrity
  • http://www.edn.com/electronics-blogs/impedance-measurement-rescues/4435846/Impedance-measurements-stabilize-op-amp-buffers