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<blockquote data-quote="Mark DeArman" data-source="post: 138018" data-attributes="member: 950">Re: dB calculationsHah cool, I used to have an ole&#039; Simpson 260 when I was a kid.&nbsp; I loved that bakelite construction and smell of old circuit boards it had.&nbsp; Unfortunately the switch broke in it, and it wasn&#039;t worth replacing.Yes, the neat thing about measuring RMS average and instantaneous power simultaneously is you can measure the real and imag power components.I&#039;m in the process ( I might have mentioned this a couple times over the past year... I just keep putting it off, because it requires some mechanical design,) of making an even more advanced power/impedance meter right now.&nbsp; The key component, made by some start-up company in the valley, I&#039;m told can measure the current phase with 0.1% linearity over the full audio band.&nbsp; I&#039;m going to package this up with a 500W class-D amp with has an attenuated output coherent with the driven channel, a six channel ADC, some calibration hardware, and a high stability signal generator.&nbsp; Should be able to make very precise network measurements, and then use the sixth channel to correlate with either a laser or SPL input.&nbsp; It&#039;s kind of a fun project, it has just taken me some time to select the right analog components to do the voltage and current measurements with.</blockquote>

[QUOTE="Mark DeArman, post: 138018, member: 950"] Re: dB calculations Hah cool, I used to have an ole' Simpson 260 when I was a kid. I loved that bakelite construction and smell of old circuit boards it had. Unfortunately the switch broke in it, and it wasn't worth replacing. Yes, the neat thing about measuring RMS average and instantaneous power simultaneously is you can measure the real and imag power components. I'm in the process ( I might have mentioned this a couple times over the past year... I just keep putting it off, because it requires some mechanical design,) of making an even more advanced power/impedance meter right now. The key component, made by some start-up company in the valley, I'm told can measure the current phase with 0.1% linearity over the full audio band. I'm going to package this up with a 500W class-D amp with has an attenuated output coherent with the driven channel, a six channel ADC, some calibration hardware, and a high stability signal generator. Should be able to make very precise network measurements, and then use the sixth channel to correlate with either a laser or SPL input. It's kind of a fun project, it has just taken me some time to select the right analog components to do the voltage and current measurements with. [/QUOTE]

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