Counter pron. HP 5384A check out.
Went really well - nothing wrong with it at all I can find.
Good first sign - original HP stickers still covering the screw holes. And oh yes it did have four actual HP feet which I have already removed here.
![](https://imgur.com/xXesFF5.jpg)
Insides - nice neat and tidy. Date codes point to late 1992 as the build date
![](https://imgur.com/noCAluI.jpg)
Quick look towards the display
![](https://imgur.com/5EVnvDn.jpg)
Hole ready for something better than the built in oscillator. I have taken measurements. Distance between the three pins is 0.3". Distance between the three and the single one is 1.5". Bounding box is 2"x 1.25" centred. Will knock a board up in Kicad for this and a footprint for the OCXO I have ordered.
![](https://imgur.com/42RoxEB.jpg)
10MHz "standard" oscillator. 3.6 Roentgen Not Great Not Terrible. Will be removed when the above is done...
![](https://imgur.com/JfBZWHI.jpg)
Bottom of the board. Nice HP design, clearly Zukon output though as always
![](https://imgur.com/qgMnErn.jpg)
Close up
![](https://imgur.com/HimRqYl.jpg)
I'm really liking this. It's fairly small and it'll do 11 digits over 10s which is plenty. 11 digits only between 1.0 and 1.299 multipliers apparently. Assume that's a register or buffer limit but fine for standard 1/10MHz references
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/xsmiley.gif.pagespeed.ic.R8GFI-pF6f.png)