<div>I'm sorry to "put my nose" on the talk... have any of you guys tryed <a href="http://www.micro-ohm.com/temperature/temprecflm.html">http://www.micro-ohm.com/temperature/temprecflm.html</a> this company? I dont know if they make thoses values, but the +3500 they make them..
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<div>i've asked once for samples of 1k and 2k +3500 but i had no chance to test them yet... they are very nice persons (at least the one i've talked).</div>
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<div>hope it helps!</div>
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<div><span class="gmail_quote">On 20/05/06, <b class="gmail_sendername"><a href="mailto:HA.Synth@t-online.de">HA.Synth@t-online.de</a></b> <<a href="mailto:HA.Synth@t-online.de">HA.Synth@t-online.de</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Thanks Ryan,<br><br>looks like I should go for +3500. But I have one questons. If i look at the<br>tracking chart of PT146-35 it says 3440ppm at 25 and 3500ppm at 100degC.
<br>In your paper you wrote +3369 at 25C and +3430 at 100C.<br>If I look at RES/TEMP CURVE at their site I can read +3369 at 25C and +3420 at<br>100C.<br>What am I missing here? Is the tracking chart wrong?<br><br>Harald<br>
<br>> hi,<br>><br>> for <a href="http://precisionresistor.com">precisionresistor.com</a> tempcos, I believe that +3500 is the correct<br>> part to buy. They specify that these are actually more like +3369 at<br>
> room temperature. thats pretty close to to the +3355 that is needed. The<br>> problem is how they measure tcr and they comment on using the +3500ppm<br>> instead of the lower +3350ppm at the website. the tcr isn't linear and
<br>> there is some tolerance on the parts anyway. It would be better to have<br>> a tcr that is to high than too low since correcting the error is easier<br>> that way. I wrote some document about using the precisionresistor PT146
<br>> here:<br>> <a href="http://www.sdiy.org/destrukto/notes/tempco_calculations_pt1.pdf">http://www.sdiy.org/destrukto/notes/tempco_calculations_pt1.pdf</a><br>><br>> note: most credit goes to Ian for this since it was his analysis and
<br>> answers to my questions that helped me write it.<br>><br>> btw. if anyone sees a problem, let me know so I can correct it.<br>><br>> Ryan Williamsf<br></blockquote></div><br>