"Beta" value on thermistors - what is it and how do I use it

[JaimeP]

Hello..

I was making a fan controller for my servers and I noticed that these
thermistors that I'm going to be using has a "Beta" value. What is
this value and why do I care?

I tried to look it up on Google but I didn't find anything useful.
Maybe it's because I didn't really know what I was looking for.

Thanks for any information anyone might have,

-Jaime

 

[John Jardine]

JaimeP <jaime@pirnie.org> wrote in message
news:s1ce5091348o4j3vre9hqnakrkp9a5pr6o@4ax.com...

Hello..

I was making a fan controller for my servers and I noticed that these
thermistors that I'm going to be using has a "Beta" value. What is
this value and why do I care?

I tried to look it up on Google but I didn't find anything useful.
Maybe it's because I didn't really know what I was looking for.

Thanks for any information anyone might have,

-Jaime

If it's a value between say 1500 and 6000 then it could be a 'degrees K'
value that's used in an equation for a thermistor's resistivity. Marked as
'B'
something like ... Q=AT^-c exp(B/T)
regards
john

 

[John Popelish]

JaimeP wrote:

Hello..

I was making a fan controller for my servers and I noticed that these
thermistors that I'm going to be using has a "Beta" value. What is
this value and why do I care?

I tried to look it up on Google but I didn't find anything useful.
Maybe it's because I didn't really know what I was looking for.

Thanks for any information anyone might have,

-Jaime

Take a look at page 3 of this application note:
http://www.vishay.com/docs/33001/seltherm.pdf
beta is the B multiplier in the expression.

--
John Popelish

 

[John Fields]

On Tue, 16 Mar 2004 08:50:33 -0800, JaimeP <jaime@pirnie.org> wrote:

Hello..

I was making a fan controller for my servers and I noticed that these
thermistors that I'm going to be using has a "Beta" value. What is
this value and why do I care?

I tried to look it up on Google but I didn't find anything useful.
Maybe it's because I didn't really know what I was looking for.

Thanks for any information anyone might have,

---
Try "thermistor beta" (without the quotes) for some excellent hits,
including:

http://www.betatherm.com/thermistortheory/betavalueb.htm

--
John Fields