Thanks  Neil,

Cheers

Ravi

> Assuming it's linear...
>
> TDS =3D (2500-30)/(6500-400)F + C
> Using any point, I get C =3D -132, so ...
>
> TDS =3D 0.4049 * F -132
>
> Cheers,
> -Neil
>
>
>
>
> On 8/22/2014 11:48 AM, Ravi wrote:
>> Hello All,
>>
>> I hope that I have the right tag. I am a bit rusty and hope that some
>> one 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
>> get 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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