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HP 5335A Timer / Counter - Anything i should know?

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Dr. Frank:

--- Quote from: Vgkid on May 22, 2014, 12:30:20 am ---It would be interesting to know why they didn't fit the 10811A spec'd oscillators to these units, as opposed to the 10811-6011 oscillators.

--- End quote ---

Hu, waddaya mean??

The 10811 OCXO exists in many different versions, i.e. HP10811A/B/D-xxxxx, differently specified (Allan statistics), different pinning, or in a doube oven.

The 5335A, opt. 010 and the 5370B both have the 10811-60111 version, which already is very good... after all those years.

If I find the datasheet, that specifies several of the versions, I'll upload it here.

Here's the document about the various versions:
http://www.leapsecond.com/museum/10811a/90027-1.pdf

Frank

babysitter:

--- Quote from: Dr. Frank on May 21, 2014, 09:52:46 pm ---
--- Quote from: babysitter on May 21, 2014, 09:46:53 pm ---
Glad to hear that the 5335 also has a crappy timebase :)

--- End quote ---

No, my friend!  :box:
Mine already came with the 10811  :-+

--- End quote ---

Well, yours... your equipment I suppose is one of the best cal labs around. And with competent end enthusiastic personnel, not just soe demotivated guy who needs to do it to bring home food  ;)

But I somewhat understand the reasoning behind HPs decision for those designs.

max_torque:
Here's a few pics of the internals.  Looks like it must have been built some time late in 1987, as most of the iC date codes are mid '87:






















I'm definitely going to be looking for an 10811a to fill the empty slot ;-)

Wim13:
I got mine 5335a very cheap, because it was totally dead, but cosmetic very good condition

After lot of research, all of the tantal C's on the input board were totally short circuit. The blue bulbs in the picture.
The power supply is short protected, so replaced all tantals, and the unit was up and running, and in good condition.

In my unit there was a 10544 ocxo, whixh is very good, compared to my Rubidium standard.
i also have a 10811, but that unit is worse compared to the 10544.

For precision work i use the rubidium clock, connected to the external clock input.

Also replaced the FAN for a silent computer fan, works very well no fan noise anymore.

max_torque:
Interesting about the fan replacement, mine i extremely noisy, and seemingly over powerful for the heat generation capability of the unit!  I wonder if being "rack mountable" the fan is spec'd to get relatively "hot" air, rather than the typical 25-30degC air of a typical electronics lab??  A quiet fan would be nice, looks like mine is powered off the unregulated ~25vdc rectified bus.  Fan is 30Vdc rated

Regarding swapping in a OCXO, the manual suggests a jumper wire must be removed to disconnect the original "on pcb" clock source, but where is this wire? (maybe later units don't have it?)  I can find all the components in the original clock source, but it's not immediately obvious (to me ;-) where that jumper is.

Thirdly, are there any affordable GPIB -> USB adaptors, they all seem silly money for what is effectively a parallel to serial converter  :o

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