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</o:shapelayout></xml><![endif]--></head><body lang=FR-CA link=blue vlink=purple><div class=WordSection1><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><a href="https://www.qservice.tv/vpasp/shopexd.asp?id=12458&bc=no"><span lang=EN-CA>https://www.qservice.tv/vpasp/shopexd.asp?id=12458&bc=no</span></a><span lang=EN-CA><o:p></o:p></span></p><p class=MsoPlainText><span lang=EN-CA><br></span>The seller quotes:<o:p></o:p></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></div></body></html>