[sdiy] PT1000 (was Re: (no subject))

Ian Fritz ijfritz at comcast.net
Sat Apr 6 15:12:16 CEST 2019


Roman --

 I do not understand why the series resistor would not work well. We must be calculating differently?
http://ijfritz.byethost4.com/sy_cir7.htm
Isn't the resistance PTAT plus a constant?

Ian


> On Apr 5, 2019, at 3:23 AM, Roman Sowa <modular at go2.pl> wrote:
> 
> I have used PT1000 once, mostly because I could, and out of curiosity, and because it's the only tempco available in SMD with well defined TCR. Nice thing about it is precise tempco, 3850 every time, while typical cheap tempsos have +/-400ppm tolerance.
> 
> But whatever math I tried, could not find nice and clean way to make the overal circuit down to 3300ppm from those 3850 in reasonable temp range. You can trim to whatever TCR by adding resistor, but it works only at given temperature. I guess it's still better than random TCR of regular cheap 3300ppm PTC in a small range of temperatures.
> 
> Roman
> 
> W dniu 2019-04-04 o 21:55, Mike Beauchamp pisze:
>> Has anyone used the Platinum RTD mentioned in the PDF? I see Digikey has quite a few in stock of different values,  ±3850ppm/°C.
>> Mike
>>> On 3/27/19 1:31 AM, Michael E Caloroso wrote:
>>> I wish he wasn't anonymous.  He does very good work.
>>> 
>>> MC
>>> 
>>>> On 3/27/19, Ian Fritz <ijfritz at comcast.net> wrote:
>>>> “Guest” has been reporting his results regularly over at Muff’s for the past
>>>> few years. Very careful and thorough work, IMO.
>>>> 
>>>> Ian
>>>> 
>>>>> On Mar 26, 2019, at 10:17 PM, Michael E Caloroso
>>>>> <mec.forumreader at gmail.com> wrote:
>>>>> 
>>>>> Not sure this was already posted, but this is an excellent article
>>>>> (technical descriptions including the math) on temperature
>>>>> compensation techniques used in exponential converters for VCO.
>>>>> 
>>>>> http://www.openmusiclabs.com/2015/03/temperature-compensation-of-analog-exponential-converters/trackback/index.html 
>>>>> 
>>>>> MC
>>>>> _______________________________________________
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