If a loading resistor of 10kohm is needed for the circuit, and you are
using a digital multimeter with a sensitivity of 10mohm/volt, you should be
able to substitute the measurement with an older analog meter such as a
Simpson 260 that has a sensitivity of 10kohm/volt and would be ideal for
checking the accuracy of the sensor out of circuit without any loading
resistor (the meter would be your loading resistor).  Maybe this is what
the manufacturer does during the QA process of the component anyways?
Mike/ke6cvh
----- Original Message -----
From: Nick Veys <nick@VEYS.COM>
Sent: Wednesday, July 25, 2001 12:13:19 PM
To: <PICLIST@MITVMA.MIT.EDU>
Subject: Re: [EE]: LM35 Woes

> Glancing at the datasheet I don't see anything for a loading resistor so
> I didn't use one... I'll give that a try.
>
> nick@veys.com | www.veys.com/nick
>
>
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Scott F. Touchton
> > Sent: Wednesday, July 25, 2001 9:41 AM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [EE]: LM35 Woes
> >
> >
> >
> > If all you connections check out (including placing a loading
> > R on the output... 10K or so) they might in reality be the
> > Fahrenheit version......
> >
> > Scott F. Touchton
> > 1550 Engineering Manager
> > JDS Uniphase
> >
> >
> >
> >                     Nick Veys
> >                     <nick@VEYS.COM        To:
> > PICLIST@MITVMA.MIT.EDU
> >                     >                     cc:
> >                     Sent by: pic          Subject:     Re:
> > [EE]: LM35 Woes
> >                     microcontrolle
> >                     r discussion
> >                     list
> >                     <PICLIST@MITVM
> >                     A.MIT.EDU>
> >
> >
> >                     07/25/01 09:12
> >                     AM
> >                     Please respond
> >                     to pic
> >                     microcontrolle
> >                     r discussion
> >                     list
> >
> >
> >
> >
> >
> >
> > First thing I tried... It promptly heated up way beyond being
> > touchable...
> >
> > nick@veys.com | www.veys.com/nick
> >
> >
> > > -----Original Message-----
> > > From: pic microcontroller discussion list
> > > [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Richard Prosser
> > > Sent: Tuesday, July 24, 2001 10:55 PM
> > > To: PICLIST@MITVMA.MIT.EDU
> > > Subject: Re: [EE]: LM35 Woes
> > >
> > >
> > > Try connecting them the other way around
> > > (when connected backward they look like a diode)
> > >
> > > Richard P
> > >
> > >
> > >
> > > Greetings :)  I'm having trouble with some LM35 Centigrade
> > temperature
> > > sensors... I'm simply trying to read them w/a multimeter
> > and getting
> > > annoying values.  The Vss and Gnd are 5.12 and 0 respectively, and
> > > when I go to read the Vout, I get between .667 - .733 V.
> > Meaning my
> > > room is a toasty 66.7-73.3C.  Quite warm!  This is happening with 3
> > > separate sensors!  Not sure what my problem is...  Any
> > tips?  Perhaps
> > > I'm reading this totally wrong?
> > >
> > > nick@veys.com | www.veys.com/nick
> > >
> > > --
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