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Re: Solve Simple Relationship

From: Thomas D. Dean
Subject: Re: Solve Simple Relationship
Date: Fri, 27 Aug 2021 17:06:39 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

On 8/27/21 2:17 PM, José Abílio Matos wrote:
On Friday, 27 August 2021 16.09.33 WEST Thomas D. Dean wrote:
I have a voltage divider I want to calibrate. I tried this by exchanging
the resistors and measuring the resultant rfesistance.

1.6516 = 3.3 * R1 / (R1 + R2)
1.6484 = 3.3 * R2 / (R1 + R2)

R1 is around 1005 ohms
R2 is around 1003 ohms

I think this is simple.  But evidently, it is beyond me.

Tom Dean

As others said your equations are the same, that is

1.6516 = 3.3 * R1 / (R1 + R2) <=> 1.6484 = 3.3 * R2 / (R1 + R2)

So you do not have 2 but just 1 equation.

Note that 1.6516 + 1.6484 = 3.3.

So you really need another equation to resolve this problem. :-)

Yes, I saw the relationship between the coeffs. And, the two equations are not independent, implicit plot shows they are the same line. I should have done this first.

Thanks for all the replies.

Tom Dean

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