[ARC5] Smart People: Multi-Set Current Corn-fusion

[J Mcvey]

OK, check that by running them individually and all three with no signal applied. 
Now you have a solid base line.
 

    On Sunday, December 3, 2017 9:47 AM, David Stinson <arc5 at ix.netcom.com> wrote:
 

 #yiv1786854735 #yiv1786854735 -- _filtered #yiv1786854735 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv1786854735 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv1786854735 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv1786854735 #yiv1786854735 p.yiv1786854735MsoNormal, #yiv1786854735 li.yiv1786854735MsoNormal, #yiv1786854735 div.yiv1786854735MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;}#yiv1786854735 a:link, #yiv1786854735 span.yiv1786854735MsoHyperlink {color:#0563C1;text-decoration:underline;}#yiv1786854735 a:visited, #yiv1786854735 span.yiv1786854735MsoHyperlinkFollowed {color:#954F72;text-decoration:underline;}#yiv1786854735 p.yiv1786854735MsoPlainText, #yiv1786854735 li.yiv1786854735MsoPlainText, #yiv1786854735 div.yiv1786854735MsoPlainText {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;}#yiv1786854735 span.yiv1786854735PlainTextChar {}#yiv1786854735 span.yiv1786854735EmailStyle19 {color:#1F497D;}#yiv1786854735 .yiv1786854735MsoChpDefault {font-size:10.0pt;} _filtered #yiv1786854735 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv1786854735 div.yiv1786854735WordSection1 {}#yiv1786854735  From: Mike Feher [mailto:n4fs at eozinc.com] 

When you have just one set on, did you include the off current of the other sets. How were the measurements made? 73 – Mike ----------  Have them all on a common B+ buss, fed from a regulated, current-limited supply.  Individually, when off, the sets should draw about 4 mA each (screen dividers).  Current is measure both at the supply and via a Fluke bench meter in the Negative lead.  Individual set current measurements do, therefore, include the currents from the two “off” sets, but that should amount to no more than 8 or 9 mA additional.  With all three sets playing at identical levels, we seem to have 34 mA missing here.  A dim bulb just went off in my head…The DC current isn’t constant; the current varies with the receiver output, especially the Audio PA output.  Bench meters “average” the current over time.  Since the three receivers are outputting different waveforms if plotted over time, the average of the currents will not be a straight sum of the individual currents, but rather an *averaged* sum of all three over time.  i.e. At any one instance in time, Set 1 may be at full output and pulling 50 mills, while set 3 is silent pulling 5 mills and set 3 is in between, pulling 20 mills.   Total at that time: 75 mills.  Take an average over a long enough time and 83 mills is probably right.  What do you think?  Somewhere close?

73 Dave AB5S  ______________________________________________________________
ARC5 mailing list
Home: http://mailman.qth.net/mailman/listinfo/arc5
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:ARC5 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20171203/b50a9a42/attachment-0001.html>