I would suspect that sunlight on the display raises the current draw of the display. This current draw is on the 5 volt regulator of the entire meter. Being an inexpensive meter the 5 volt regulator is also the reference voltage for the meter. Current goes up, reference voltage goes down. Reference voltage goes down and the reading goes up.
Sincerely, Mark Grasser - -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of Cor van de Water via EV Sent: Tuesday, March 17, 2015 7:22 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] Watch "Malfunctioning meter." on YouTube Electronic circuits (The silicon wafer that carries the transistors and other circuitry) is affected in its operation by light. Similar to a solar cell generating current when hit by photons, also a slice of silicon for a transistor or other electronic component will start generating a small current under light, so it is a sign that the actual chip of the meter, which normally is potted in a black blob for this reason, is not completely potted and is receiving enough light to be affected by the (stray) light falling on it. It is the electronics that is affected by light (photons), not the LCD or the heat. Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of Lawrence Rhodes via EV Sent: Tuesday, March 17, 2015 3:33 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] Watch "Malfunctioning meter." on YouTube I suspect some sort of feedback via the LCD panel caused by sunlight. Using Ohm's law might shed some light...I don't know how though. Lawrence Rhodes >________________________________ > From: Michael Ross <[email protected]> >To: Lawrence Rhodes <[email protected]>; Electric Vehicle >Discussion List <[email protected]> >Sent: Tuesday, March 17, 2015 3:08 PM >Subject: Re: [EVDL] Watch "Malfunctioning meter." on YouTube > > > >If it wasn't for the possibly coincidental sunlight, I would say it looks like an electromechanical voltage regulator in action. A regulator might go as high as 14 and change, and when it stops charging the battery voltage shows and is load dependent - not steady. > > >The change is kind of fast to be a thermal effect of the sunlight on plastic (not very conductive). Usually instrumentation amps for voltage are not that susceptible to changes in ambient temperature. How could be simply the light intensity? I don't have a feel for that. You could mess around with an ice pack or a bottle of chip freezer spray and see if the change goes the other direction. > > > > > >On Tue, Mar 17, 2015 at 5:55 PM, Lawrence Rhodes via EV <[email protected]> wrote: > >Malfunctioning meter.: https://youtu.be/xNy8IOlRkII >> >>This is the correct url. Lawrence Rhodes >> >>-------------- next part -------------- An HTML attachment was >>scrubbed... >>URL: >><http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150317/0d >>32c3cf/attachment.htm> >> >>_______________________________________________ >>UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >>http://lists.evdl.org/listinfo.cgi/ev-evdl.org >>For EV drag racing discussion, please use NEDRA >>(http://groups.yahoo.com/group/NEDRA) >> >> > > > >-- > >To invent, you need a good imagination and a pile of junk. >Thomas A. Edison > > >A public-opinion poll is no substitute for thought. >Warren Buffet > > >Michael E. Ross >(919) 585-6737 Land >(919) 576-0824 Google Phone >(919) 631-1451 Cell > > >[email protected] > > > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150317/358718ea /attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
