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. Bu
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
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
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
org
>Subject: Measuring AC
>
>
>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 pr
Corp. 610 648 3653
--
From: owner-emc-pstc
To: emc-pstc
Subject: Measuring AC
List-Post: emc-pstc@listserv.ieee.org
Date: Thursday, January 16, 1997 9:21AM
Return-Path:
Received: from trsvr.tr.unisys.com by trpo1.tr.unisys.com id
<32de7...@trpo1.tr.unisys.com>; Thu, 16 Jan 97
I want to thank everyone for the great information I got in response to
my question about measuring AC.
One thing I hadn't thought about with my off-the-cuff idea of simply
using a voltage divider is the issue of isolating the AC return and the
circuit board return. Not isolating these rai
I'm trying to characterize the 50Hz AC line impedance of my facility, for
comparison to the values specified in IEC61000-3-3. I've come across
"generic" short circuit values for the Resistive and Inductive components.
However, I need to determine exactly what these values are ideally through a
co
don't you stick the probes in the outlet with the knob set to 'OHMS'? (;o)
sorry couldn't resist it.
don't try this at home folks.
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
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Subject: re: Measuring AC
Author: Max at mailway
List-Post: emc-pstc@listserv.ieee.org
Date:1/22/97 4:10 PM
I
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
: emc-p...@majordomo.ieee.org
cc:(bcc: Don Borowski/SEL)
Subject: Re: Measuring AC Line Impedance
I read in !emc-pstc that Spencer, David H
wrote (in <052106A55179D611B34300096BB02E3F8B1D@USAMCMS4>) about
'Measuring AC Line Impedance' on Thu, 19 Sep 2002:
>Is anyone fam
: emc-p...@majordomo.ieee.org
cc:(bcc: Don Borowski/SEL)
Subject: Re: Measuring AC Line Impedance
I read in !emc-pstc that Spencer, David H
wrote (in <052106A55179D611B34300096BB02E3F8B1D@USAMCMS4>) about
'Measuring AC Line Impedance' on Thu, 19 Sep 2002:
>Is anyone fam
Hi Dave:
I had the same question some time back, and came up with the following process.
1) For the resistive component, I applied a resistive load to the AC line, and
calculated R = dV/dI
2) For the inductive component, I measured the transient current through an 'X'
capacitor at the moment it
In a message dated 9/19/2002, you write:
> So far, I've taken a large resistive load and measured the voltage drop on
> the AC line. From that I calculated the total impedance of the AC line.
> However, as you may suspect, with a resistive load, the power factor is
> 1.0.
> So I can't vectorly
I read in !emc-pstc that Spencer, David H
wrote (in <052106A55179D611B34300096BB02E3F8B1D@USAMCMS4>) about
'Measuring AC Line Impedance' on Thu, 19 Sep 2002:
>Is anyone familiar with a method to measure and calculate those values. The
>generic values I have for short ci
In a message dated 9/19/2002, you write:
> So far, I've taken a large resistive load and measured the voltage drop on
> the AC line. From that I calculated the total impedance of the AC line.
> However, as you may suspect, with a resistive load, the power factor is
> 1.0.
> So I can't vectorly
eee.org
To:emc-p...@majordomo.ieee.org
cc:
Subject:Re: Measuring AC Line Impedance
I read in !emc-pstc that don_borow...@selinc.com wrote (in
) about 'Measuring
AC Line Impedance' on Tue, 5 Nov 2002:
>Part 1. This measurement will NOT give just the resistive part of the
&g
I read in !emc-pstc that don_borow...@selinc.com wrote (in
) about 'Measuring
AC Line Impedance' on Tue, 5 Nov 2002:
>Part 1. This measurement will NOT give just the resistive part of the
>source impedance.
Your post is so long that it is not clear what you are trying to
corre
Hello,
UL emc in Northbrook has the capoability
http://www.ul.com/emc/
Regards,
Ken Hall
-Original Message-
From: robert.s...@flextronics.com [mailto:robert.s...@flextronics.com]
Sent: Tuesday, November 05, 2002 10:16 AM
To: emc-p...@majordomo.ieee.org
Subject: RE: Measuring AC
Does anyone know of a source of test equipment, purchase or rental, or a
test house on the US east coast that can perform the "click" test described
in CISPR 14?
Thanks,
Robert Seay
Flextronics Compliance Labs
762 Park Avenue
Youngsville, NC 27596
---
Th
annot be solved.
Don Borowski
Schweitzer Engineering Labs
Pullman, WA
"Spencer, David H" @majordomo.ieee.org on
10/30/2002 08:57:00 AM
Please respond to "Spencer, David H"
Sent by:owner-emc-p...@majordomo.ieee.org
To:emc-p...@majordomo.ieee.org
cc:
Subject:
...@jmwa.demon.co.uk]
Sent: Wednesday, October 30, 2002 11:30 AM
To: emc-p...@majordomo.ieee.org
Subject: Re: Measuring AC Line Impedance
I read in !emc-pstc that Spencer, David H
wrote (in <052106A55179D611B34300096BB02E3F8B94@USAMCMS4>) about
'Measuring AC Line Impedance' on Wed, 30 Oct 2002
I did that once. I had been measuring resistance and then needed to measure
ac outlet potential, but forgot to change the meter knob position. Now I
have a new meter.
--
>From: "Ted Rook"
>To: "<"
>Subject: measuring AC line impedance (:-)
>Date: Wed,
id H [mailto:david.spen...@usa.xerox.com]
Sent: Wednesday, October 30, 2002 9:57 AM
To: emc-p...@majordomo.ieee.org
Subject: RE: Measuring AC Line Impedance
Follow up
Having just completed an ton of work on this using input I got around here
(thanks to Don Borowski, Patrick Lawler,
I read in !emc-pstc that Robert Macy wrote (in
<000801c28045$01fc35c0$b7775142@robertmacy>) about 'Measuring AC Line
Impedance' on Wed, 30 Oct 2002:
>Do you have the liberty to share your report - or details and results with
>the group?
The results apply only to that par
I read in !emc-pstc that Spencer, David H
wrote (in <052106A55179D611B34300096BB02E3F8B94@USAMCMS4>) about
'Measuring AC Line Impedance' on Wed, 30 Oct 2002:
>Any comments or input would be welcome.
It's how I do it. It comes as a surprise to some people that the voltag
, Suite 402
San Jose, CA 95112
- Original Message -
From: "Spencer, David H"
To:
Sent: Wednesday, October 30, 2002 8:57 AM
Subject: RE: Measuring AC Line Impedance
>
> Follow up
>
> Having just completed an ton of work on this us
mains.
Any comments or input would be welcome.
Thanks
Regards
David Spencer
Xerox Corp.
-Original Message-
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: Thursday, September 19, 2002 11:56 AM
To: emc-p...@majordomo.ieee.org
Subject: Re: Measuring AC Line Impedance
I read in
%>
%>
%> I suspect (but don't know for sure) that the accuracy of a transformer
is
%> the way it performs, relative to it's spec's, rather than relative to
its
%> history. That is, a _given_ transformer may be extremely accurate once
%> calibrated, but the _initial_ accu
& Product DevelopmentDesign Quality Control
Via di Caciolle,15tel:+39.055.4229306
I- 50127 Florence fax:+39.055.4223305
e-mail: paolo.peru...@esaote.com
I read in !emc-pstc that don_borow...@selinc.com wrote (in
) about 'Measuring
AC Line Impe
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