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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Hi Jean-Pierre!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">I would go for option one and use a AA or AAA size lithium cell that will last for the next 25 years for sure…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Why?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">As the lifetime of lithium cells is given in the datasheet for about 10 years. Even if they are not used – just think of self discharge
and electrode passivating effects.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Ciao<br>
Peter<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="DE" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Von:</span></b><span lang="DE" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Synth-diy <synth-diy-bounces@synth-diy.org>
<b>Im Auftrag von </b>Jean-Pierre Desrochers<br>
<b>Gesendet:</b> Freitag, 30. April 2021 22:08<br>
<b>An:</b> Synth-diy@synth-diy.org<br>
<b>Betreff:</b> *EXT* [sdiy] Hardware gurus.. I need your opinion here..<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoPlainText"><span lang="EN-CA">I have a full functional old 90's Tektronix TDS350 that I use a lot.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA">I love this Faithfull scope but its Dallas non-volatile Ram DS1630AB-120 has a datecode 9430 (1994, 30th week !)<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA">BUT it still keeps its calibration and data memory settings !!
<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA">Imagine.. more than 25 years after !<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA">Well because I don't want to push my luck too far here<br>
I decided to replace this Dallas RAM for something more reliable<br>
for the next years to come..<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoPlainText"><b><span lang="EN-CA" style="font-size:12.0pt">2 choices:<o:p></o:p></span></b></p>
<p class="MsoPlainText"><b><span lang="EN-CA" style="font-size:12.0pt"><o:p> </o:p></span></b></p>
<p class="MsoPlainText"><span lang="EN-CA">Replace it with a small 28DIP600 pcb hybrid filled with<br>
a non-volatile RAM controller IC + a 32k x 8 SRAM<br>
using an external connected 3V lithium battery.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoPlainText"><b><span lang="EN-CA" style="font-size:12.0pt">OR<o:p></o:p></span></b></p>
<p class="MsoPlainText"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA">Buy a genuine Tektronix Dalals DS1630AB-120 like these ones for sale at $14.99US each.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="FR-CA"><a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.qservice.tv%2Fvpasp%2Fshopexd.asp%3Fid%3D12458%26bc%3Dno&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7Cccf7343fab48405e365f08d90c1453c5%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637554103712111104%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=Ogec5bXOqV9O9JI0WZryVa5A4Jqu6KJ6XrUgFoR4XUA%3D&reserved=0"><span lang="EN-CA">https://www.qservice.tv/vpasp/shopexd.asp?id=12458&bc=no</span></a></span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA"><br>
</span><span lang="FR-CA">The seller quotes:<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA">".. the date codes are 9510 or -1995, 10th week"<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA">".. all these are genuine parts bought from the tektronix surplus store in Beaverton, "<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA">Here I was aware of the inner battery life span left from the manufacturer's datecode.<br>
But the actual DS1630AB specs page 10 says:<o:p></o:p></span></p>
<p class="MsoPlainText"><b><i><span lang="EN-CA" style="font-size:12.0pt">9 - Each DS1630 has a built-in switch that disconnects the lithium source until Vcc is first applied by the user.<br>
The expected Tdr is defined as accumulative time in the absence of Vcc starting from the time power<br>
is first applied by the user.<o:p></o:p></span></i></b></p>
<p class="MsoPlainText"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA">Sure these could have been connected at least once then the battery<br>
countdown started OR these have never been used..<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-CA">What do you think ?<o:p></o:p></span></p>
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