Thanks Bob,

It is a linear response. Will try it out :-)

Cheers

Ravi

> Are you expecting a linear response? If so...
>
> We know the following:
>
>> 6500 Hz - 2500 TDS
>> 400 Hz - 30 TDS
>
> Setting that up as equations in the form y=3Dmx + b we get:
>
> 2500 =3D m*6500+b
> 400 =3D m*30+b
>
> Now just solve those two equations for 'm' and 'b' (a simple exercise for
> the reader) and you have what you need.
>
> ~ Bob Ammerman
> RAm Systems
>
>> -----Original Message-----
>> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
>> Of Ravi
>> Sent: Friday, August 22, 2014 11:49 AM
>> To: Microcontroller discussion list - Public.
>> Subject: [EE] Formula for calibration
>>
>> Hello All,
>>
>> I hope that I have the right tag. I am a bit rusty and hope that some on=
e
>> would point me in the right direction.
>>
>> I am designing a TDS meter.
>>
>> For a TDS of 2500, I get a frequency of 6500 Hz and for a TDS of 30, I g=
et
> a
>> frequency of 400 Hz.
>>
>> My 2 points of calibration are those below.
>>
>> 6500 Hz - 2500 TDS
>> 400 Hz - 30 TDS
>>
>> I need a formula to calculate the intermediate values based on the
> incoming
>> frequency.
>>
>> Thanks in advance
>>
>> Cheers
>>
>> Ravi
>>
>> --
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>

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