Re: Measuring AC

1997-01-17 Thread Robert Macy
10>YouAsked 10>reduce line voltage down to low (DC) levels in order to measure the line 10>voltage with an AD converter.>> Three alternatives come to mind: transformers, caps, or "no connection". You can use a very small transformer to isolate the mains while maintaining great ac

EU law?

1997-01-17 Thread Therese A. Klein
I'm hoping someone could clarify the EU law. I've been told a EU member's government agency has taken one of our products to a Competent Body to verify conformance to the Directives. My understanding of the law is that there must have been a complaint, or incident, from a customer, for this to oc

Re: German Dioxin regulation

1997-01-17 Thread DAVE_OSBORN
Item Subject: German Dioxin regulation Hello Bharat, On July 6th, 1994, the German Government formally revised the "Chemical Prohibition Regulation" to include various congeners of brominated dioxins and furans. This legislative action, referred to as the "German D

Effective Date of EN 50082-1

1997-01-17 Thread markjc
I just became confused about the official effective date of EN 50082-1. I just read a message on this group from Kevin Richardson which states: <> This was in response to the Australian C-tick Effectivity and may not be directly related to the EN 50082-1 standard. But,I was reading in the Nov/Dec

Medical Devices Requirements for South America: Brazil, Argentina.....

1997-01-17 Thread Melinda Falez
Hello everybody. I've quite enjoyed listening to all of you "talk" for some time (8 months), although I've been rather quiet. I look after certification of mainly medical devices at CSA (I also do test & measurement and laboratory equipment). I kind of regret asking this loaded question, but may

Re: Re: Measuring AC

1997-01-17 Thread Horst Haug
Hello, You might use clause 2.4 of IEC950 or clause or clause 6.3.1.2 of IEC1010 depending what standard is valid for your equipment. LIMITED CURRENT CIRCIUT. In this way you should be able to avoid the use of transformer or optocoupler. This enables you to measure on AC (primary) and connect

Re: Measuring AC

1997-01-17 Thread jmalton
Hello. I don't know your application here of course, but it may not meet your needs simply to divide the incoming line voltage and give it to an ADC, since that would connect your logic ground to the AC neutral at the ADC, and this might not be a good plan. Using the "ground" reference fr

Re: Measuring AC

1997-01-17 Thread Tony J. O'Hara
Hi Max YouAsked <> Why not just use a precision voltage divider, and then feed the reduced ac voltage to your A/D. If you need only positve voltage, then couple into the A/D with a capacitor and add a precise DC offset voltage. <> Probably not the best way to do it! <> I am not a safety engine