Measuring PSU supply line impedance?
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Solid State Talk all about solid state amplification.

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
 20th May 2002, 12:10 AM #1 Kevinbd   diyAudio Member   Join Date: Apr 2002 Location: Swindon, U.K. Measuring PSU supply line impedance? Hello, I am novice at electronics but do want to build a good amp. Just wondering if anyone could tell me how to measure supply line impedance of the PSU? Can it be done with a good meter? Or do you need certain equipment? Thanks Kevin
 20th May 2002, 02:15 AM #2 Kevinbd   diyAudio Member   Join Date: Apr 2002 Location: Swindon, U.K. Just wanted to add something Obviously psu impedance varies with frequency, unless it's a very good regulator which can be flat, say upto 100Khz. If i wanted to measure psu impedance at 20Hz, would i inject a 20HZ sine or square wave at an appropriate voltage level into the power amp then measure it with a meter?
 20th May 2002, 04:55 AM #3 Jocko Homo   Banned   Join Date: Feb 2002 Location: As far from the NOSsers as possible Not sure exactly what you want to measure. You can measure the impedance of any power supply by feeding a signal through a large value resistor (making it a constant-current source of sorts)and a cap to prevent DCfrom frying the source. Then measure the voltage on the supply rail, but you need a way of measuring only the signal frequency, and not ripple, hum, whatever. Jocko
 20th May 2002, 09:56 AM #4 UrSv   diyAudio Member     Join Date: Jan 2002 Location: Sweden I would also expect that you mean output impedance which you can measúre for DC impedance by measuring the output voltage at one specific current and then at another and then calculating the impedance as dU/dI. So say that you have 40 V out with 2 A load and 38 V out with 4 A load then the output impedance is (40-38)/(4-2) = 1 Ohm as far as I can tell (it is the voltage drop over the internal output impedance). Also you might want to investigate an article in Elektor a few years back which deals with measuring dynamic performance of PSUs by switching a load in and out for the PSU and measures recovery, spikes ect by simulating this more real life load (for some apps of course). Interesting as far as I remember. /UrSv

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Aussie Amplifiers         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post korneluk Tubes / Valves 21 27th December 2010 10:58 PM dallaire Multi-Way 4 11th December 2007 11:44 AM ch83575 Multi-Way 4 24th November 2005 09:31 AM Kevinbd Solid State 1 22nd October 2004 08:00 AM gary f Multi-Way 12 5th June 2004 01:18 AM

 New To Site? Need Help?

All times are GMT. The time now is 06:20 PM.

 Home - Contact Us - Advertise - Rules - diyAudio Store - Sponsors - Privacy Statement - Terms of Service - Top - Opt-out policy

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.