[volt-nuts] 7081 resistance accuracy issue

[m k]

Hi Mickle,

That is good to know, I know it is a positive tempco I have, I will just have to try a stable resistor and see what it gives me, but there is more checking to do first.

Regards,

M K

> Date: Sun, 20 Jan 2013 17:02:04 +0400
> From: timka2k at yandex.ru
> To: volt-nuts at febo.com
> Subject: Re: [volt-nuts] 7081 resistance accuracy issue
> 
> Hi, M K!
> It is almost impossible to check any of the Ohms range performance via TESTK
> mode. While in this mode a constant current is applied to the ADC with a low
> input resistance equal to 160 kOhm (R201). R201 paired with R202 is a Vishay
> VHA51x custom metalfoil resistors set. It have a very low TCR tracking error
> (needed for ADC slope stability), but a large absolute TCR value, up to 5 ppm/C.
> 
> Regards,
> Mickle T.
> 
> 
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