Re: LM35 - Length of cable ?

["Frank Mc Alinden" <armagh@xxxxxxx>]

Mark
        If its only 20 ft  the 4
core security cable would work . I dont
imagine you would be that unlucky .

Frank Mc
----- Original Message -----
From: "Mark Marooth" <MMarooth@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, May 31, 2002 9:19 PM
Subject: Re: [ukha_d] LM35 - Length of cable ?


>
>
> Hi Frank,
>
> Runs should be no longer than 20 feet through the roof space. 
You've also
> confirmed what I suspected about noise, as I am running thorugh
roof
space,
> think I'll use something shielded.
>
>
> Mark
>
>
>
> --------+------------------------>
>        
          "Frank
Mc     
>        
         
Alinden"      
>        
         
<armagh@xxxxxxx
>        
         
d.com>        
>        
                       
>        
         
31/05/2002    
>        
         
12:09         
>        
          Please respond
>        
          to
ukha_d     
>        
                       
> --------+------------------------>
>
>---------------------------------------------------------------------------
-
>   

>         To:    
ukha_d@xxxxxxx
>         cc:    
(bcc: Mark Marooth/SCOTIA)

>        
Subject:     Re: [ukha_d] LM35 - Length of cable ?

>
>---------------------------------------------------------------------------
-
>
>
>
>
> Hi Mark
>                
Havnt used the analogue sensor . The capacitance shouldnt
be
> a problem with unshielded cable but not being shielded you may get
noise
> injected into your analogue signal, so keep the cables well away
from
mains
> type stuff . How long are your runs?
> Frank Mc
> ----- Original Message -----
> From: "Mark Marooth" <MMarooth@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Friday, May 31, 2002 8:58 PM
> Subject: [ukha_d] LM35 - Length of cable ?
>
>
> >
> >
> > Chaps,
> >
> >
> > I'm going to be building a couple of temperature sensors this
weeked
using
> the
> > LM35D IC hooking into me Weeder Analogue In card.  I'm not
too sure how
> long a
> > cable I can run before the IC gives up the ghost as far as load
is
> concerned.
> > Thought I'd use 3/4 core alarm wire providing power (12V) and a
return
for
> the
> > sensor values.
> >
> > The specs say it will drive upto 50pf without special precautions
but
I'm
> afraid
> > my electronics maths is not that good to turn that into cable
length
> and/or
> > load.
> >
> > Does anyone have experience of this chip and cable length. 
If load is a
> problem
> > then I can decouple with either a resistor (2k) or with an R-C
damper.
> >
> >
> > Any thoughts,
> >
> > TIA
> >
> >
> >
> > Mark
> >
> >
> >
> >
> > For more information: http://www.automatedhome.co.uk
> > Post message: ukha_d@xxxxxxx
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> >
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> >
>
>
>
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>
>
>
>
> For more information: http://www.automatedhome.co.uk
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