/technologies/test-and-measurement/b/blog/posts/repairing-a-hp5308a-counter-where-find-help-forums-discussionsHi, this is probaly not the right forum, I&#39;ll be grateful for hints on where to go, in element 14 or some other group/forum:As surplus from my old job I have an old HP5308A counter/timer that does&#39;nt work and I&#39;d like to fix it.I have manual and scheen-USTelligent Community 12https://community.element14.com/technologies/test-and-measurement/b/blog/posts/repairing-a-hp5308a-counter-where-find-help-forums-discussionsFri, 29 Sep 2017 16:13:27 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:242fdf8f-90ec-42b3-a5a1-6abedf291d96shabaz1<p>Hi Sverker,</p><p>&nbsp;</p><p>I&#39;ve no idea about this particular device, but many of the old counters just had a discrete or logic gate based crystal based clock source in their base model, unless one paid for something better like an ovenized crystal oscillator as an option.</p><p>&nbsp;</p><p>If it isn&#39;t functioning, I&#39;d be tempted to overhaul that part of the design completely, perhaps replace it with a TCXO (cheap) or ovenized (a lot more expensive, might make it not worthwhile).</p><p>If you can, you could test if the rest of it works by feeding an external 10MHz clock if there is an input for that.</p><img src="https://community.element14.com/aggbug?PostID=3623&AppID=13&AppType=Weblog&ContentType=0" width="1" height="1">