My advice would be to us a programmable AC source. It provides all the isolation and flexibility with an undistorted waveform. You can vary the frequency from 35 Hz. to 2000 Hz, and the voltage from 0 to 240 volts. The unit can be used for generation of EMC transients and surges as called out in the IEC 1000 series and can be used to measure the effects of power quality anyway in the world. It comes in single and three phase versions. Good to 20 amperes but there are smaller versions. If you want to get the supply call me and I will refer you to the company.
Dave George Unisys Corp. 610 648 3653 ---------- From: owner-emc-pstc To: emc-pstc Subject: Measuring AC List-Post: [email protected] Date: Thursday, January 16, 1997 9:21AM Return-Path: <[email protected]> Received: from trsvr.tr.unisys.com by trpo1.tr.unisys.com id <[email protected]>; Thu, 16 Jan 97 13:45:40 EST Received: from bbmail1.unisys.com by trsvr.tr.unisys.com (8.6.12/8.6.12) id SAA17068 ; Thu, 16 Jan 1997 18:38:50 GMT Received: from ruebert.ieee.org (ruebert.ieee.org [199.172.136.3]) by bbmail1.unisys.com (8.7.3/8.6.12) with ESMTP id SAA28793; Thu, 16 Jan 1997 18:48:49 GMT Received: (from daemon@localhost) by ruebert.ieee.org (8.7.5/8.7.3) id LAA29202 for emc-pstc-list; Thu, 16 Jan 1997 11:27:03 -0500 (EST) Message-Id: <[email protected]> To: [email protected] Subject: Measuring AC List-Post: [email protected] Date: Thu, 16 Jan 1997 09:21:22 -0700 From: Max <[email protected]> Sender: [email protected] Precedence: bulk Reply-To: Max <[email protected]> X-Resent-To: Multiple Recipients <[email protected]> X-Listname: emc-pstc X-List-Description: Product Safety Tech. Committee, EMC Society X-Info: Help requests to [email protected] X-Info: [Un]Subscribe requests to [email protected] X-Moderator-Address: [email protected] ---------------------------------------------------------------------------- -- Does anyone know of a good method (or have any ideas) of how I could reduce line voltage down to low (DC) levels in order to measure the line voltage with an AD converter. Using a transformer is obviously the easiest way and probably provides the least potential problems with safety agencies. But transformers are not (I don't think) terribly accurate and they are rather bulky even in this sort of application. What are the safety implications, for example, of just rectifying and filtering the voltage and running it through a voltage divider? Thanks, Max Kelson [email protected]
