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General => General Technical Chat => Topic started by: odessa on August 08, 2017, 06:26:11 pm

Title: Logic probes
Post by: odessa on August 08, 2017, 06:26:11 pm
Hi,
Having just unlocked my Keysight 2000x Infinnivision scope using the awesome thread on this forum  8) I wondered  .... now all the features like serial decode etc are unlocked, is there anywhere that sells the logic probe kit to plug into the scope ? Or, is it possible to knock something up ?

Thanks

Jay
Title: Re: Logic probes
Post by: alm on August 08, 2017, 07:29:08 pm
You can probably order the original probe from Keysight. Pretty sure it is the same they have been using since the 54600 series. Expect them to be expensive. They certainly are on eBay.

Here (http://www.ebay.com/itm/Agilent-HP-10089A-Logic-Probe-with-Flying-Leads-for-54622D-Keysight-2000X-3000X/253041052557) is a kit which uses the ubiquitous 18-channel HP logic analyzer pods together with a flat cable and some custom adapter boards. Note that this is somewhat inferior to the original, which used a coaxial cable instead of a plain flat cable. There were some indications (https://www.eevblog.com/forum/microcontrollers/cross-talk-on-logic-analyzer-leads/) of signal integrity issues.

In my opinion $60 is not particularly cheap. It comes without ground leads or grabbers for the pod. You could buy a pod with grabbers and ground leads for a little over half that (http://www.ebay.com/itm/HEWLETT-PACKARD-HP-AGILENT-POD-1-DATA-J-CLOCK-KIT-FOR-LOGIC-ANALYZER-/222560339167). Search for (hp,agilent) (pod,pods), and look for one with accessories. You could use an IDE cable (make sure it is one with all the 40 pins present and use the part before the twist), but you would have to design your own adapter boards. I believe the pin-out is just straight through, so might even be able to build it on veroboard. There was also some discussion in the topic about cross talk of old logic analyzer cables that might fit.

If you feel like going the DIY route, you can find the equivalent schematic of the pods on page 47 and the pin-out of the pods on page 71 of this document (http://literature.cdn.keysight.com/litweb/pdf/5968-4632E.pdf).
Title: Re: Logic probes
Post by: odessa on August 09, 2017, 06:21:51 am
That's fantastic, thanks very much :)