<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">I use tweezers/pinchettas to pick up parts so my body temp will not influence the measurement.</div><div class=""><br class=""></div><div class="">I match transistors all the time and we super match resistors for building my own DACs and I use a piece of styrofoam to hold the measured devices.</div><div class=""><br class=""></div><div class="">I keep a few extra from each category so I can replace one if it goes defective.</div><div class=""><br class=""></div><div class="">We bake the resistors at a low temperature in the oven to drive out moisture .</div><div class=""><br class=""></div><div class="">Best regards,</div><div class=""><br class=""></div><div class="">Terry</div><div class=""><br class=""></div><div class="">Shultz Products LLC.</div><div class=""><a href="mailto:thx1138@earthlink.net" class="">thx1138@earthlink.net</a></div><div class=""><br class=""></div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Apr 10, 2020, at 4:12 PM, Didier Leplae via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class=""><div class="ydp79c16950yahoo-style-wrap" style="font-family:verdana, helvetica, sans-serif;font-size:13px;"><div class=""></div>
<div dir="ltr" data-setdir="false" class="">Gordon, </div><div dir="ltr" data-setdir="false" class=""><br class=""></div><div dir="ltr" data-setdir="false" class="">I tried your suggestion. Over 5 minutes the reading changed from about 350mV to about 365mV. When I grab the diode with my fingers, it actually goes down a bit, just about 2mV. I tested this repeatedly with exactly the same result.</div><div dir="ltr" data-setdir="false" class=""><br class=""></div><div dir="ltr" data-setdir="false" class="">Incidentally, if I change the multimeter to read another diode, the reading stays at the elevated reading, 365mV. So that suggests to me that the meter is what's heating up, or causing the change, rather than the diode.</div><div dir="ltr" data-setdir="false" class=""><br class=""></div><div dir="ltr" data-setdir="false" class="">Throughout all this testing, I've been quite careful not to subject the diodes to temperature changes. I've got them taped to a notebook. The notebook is sitting by itself on a chair, not in my lap or anything. I've been working in a basement, so no big temperature changes or sunlight coming in to heat them up.</div><div dir="ltr" data-setdir="false" class=""><br class=""></div><div class=""><br class=""></div>
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On Friday, April 10, 2020, 05:14:22 PM EDT, Gordonjcp <<a href="mailto:gordonjcp@gjcp.net" class="">gordonjcp@gjcp.net</a>> wrote:
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<div class="">On Fri, Apr 10, 2020 at 08:44:28PM +0000, Didier Leplae via Synth-diy wrote:<div class="ydp71332ddcyqt4938102269" id="ydp71332ddcyqtfd35852"><br clear="none" class="">> So far I have tried three different methods of testing and find the results to be confusing and unreliable.</div><br clear="none" class=""><br clear="none" class="">Get a single 1N4148 diode. Stick it in your meter in diode check mode. Observe the reading. Leave it for five minutes. Observe that the reading has changed. Squeeze the diode between your finger and thumb. Notice that the reading changes wildly with the temperature.<br clear="none" class=""><br clear="none" class="">-- <br clear="none" class="">Gordonjcp<div class="ydp71332ddcyqt4938102269" id="ydp71332ddcyqtfd16240"><br clear="none" class=""><br clear="none" class=""></div></div>
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