Author Topic: HP 5314A Universal Counter Teardown  (Read 7293 times)

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Offline theatrus

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HP 5314A Universal Counter Teardown
« on: June 20, 2014, 11:09:09 am »
Got this unit for free recently, and decided to do a teardown. It is functional, but the buttons on the unit are absolutely terrible (hard to push, don't stay pushed, etc etc). Even after some contact cleaner - need to do a bit more work on that.

Click the image to embiggen.





The inside gets the "whole lot of nothing" award, presumably for the battery option:



Power supply, note the internal voltage range switch:



The actual counter is tucked behind the front panel:



Removing the knobs (which had the set allen screws very stuck) shows the main board. Random note: the fat left 7-segment is inverted in order to put the "dot" next to the gate indicator on the front panel. A second LED is added for the Overflow indicator. The far right dot is used to indicate microseconds, and kilohertz just is indicator-less. Thats some creative cost cutting!



I miss old package markings sometimes - a transistor:



I can't find a datasheet on the main IC :(



The frequency reference / oscillator with the tuning adjustment.



There are a number of these resistor packs throughout the board:





I'm also unsure of what to make of this fuse - looks like a cotton string wrapped element with a spring? First I've seen of this particular construction.



Main pass transistor of the power supply:



Software by day, hardware by night; blueAcro.com
 

Offline Flump

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Re: HP 5314A Universal Counter Teardown
« Reply #1 on: June 20, 2014, 11:26:40 am »

Nice counter theatrus, I hope you can fix the buttons,
is that the only problem with it ?

lovely pictures  :-+
 

Offline theatrus

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Re: HP 5314A Universal Counter Teardown
« Reply #2 on: June 20, 2014, 11:56:47 am »

Nice counter theatrus, I hope you can fix the buttons,
is that the only problem with it ?

lovely pictures  :-+

Effectively - I haven't done all the ranges on both channels, but it does seem to be functional.

Its all about lighting. In this case, off camera white ceiling bounce flash
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Offline skennedy

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Re: HP 5314A Universal Counter Teardown
« Reply #3 on: June 20, 2014, 12:12:03 pm »
Amazing photos. I found the main intersil chip from the HP part number 1820-2187 to be a ICM7226A datasheet: http://www.intersil.com/content/intersil/en/products/timing-and-digital/counters-time-base-ics/counter-time-base-ics/ICM7226A.html. Looks like it does it all. I am pretty impressed by how little is in this counter. I have a 5316A that I bought a while ago and it has a lot more going on inside. I suppose this is how HP got the price down for this model.
 

Offline theatrus

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Re: HP 5314A Universal Counter Teardown
« Reply #4 on: June 21, 2014, 12:45:10 am »
That does look like a pretty much all-in-one.

I found the schematics and block diagram at the end of this scanned service manual: http://exodus.poly.edu/~kurt/manuals/manuals/HP%20Agilent/HP%205314A%20Operating%20&%20Service.pdf

Readability is pretty terrible but it can be deciphered.
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Offline SeanB

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Re: HP 5314A Universal Counter Teardown
« Reply #5 on: June 21, 2014, 03:14:08 am »
Wet slug tantalums in a good case ( glass frit seal which essentially lasts till the end of time) and a slow blow fuse with the resistance wire time delay element inside it to heat it up to melting when subjected to prolonged overload.

Lovely, and I like the Intersil house coded parts for HP. You get a variant that does timekeeping in the same package, and you can preset the count as well with the display drive. ICM 7227.
 

Offline PaulAm

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Re: HP 5314A Universal Counter Teardown
« Reply #6 on: June 21, 2014, 04:36:25 am »
HP used that case for a number of instruments of that era (the reason for all the empty space).  I have a 3466a DMM and a 5004a signature analyzer in that case.  The buttons/switches are also used on the 3466a.

The white silkscreen on the LED window is not very durable.   I have a parts 3466a with all of the white legends worn off.  Even if it worked, it would be unusable.

HP may also have offered that unit in a more standard box shaped case.  The clamshells do not stack well.  I see the handle is missing; somebody probably took it off to make it stack better.
 

Offline theatrus

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Re: HP 5314A Universal Counter Teardown
« Reply #7 on: June 21, 2014, 04:38:40 am »
I took the handle off for disassembly.

The buttons are working better with very light lubrication, but still having issues staying depressed.
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Online PA0PBZ

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Re: HP 5314A Universal Counter Teardown
« Reply #8 on: June 21, 2014, 05:11:06 am »
To compare some quick and dirty shots of my 5315A, just a little bit more inside including the C input:





Anyone know where to get the knobs? 2 are broken  :(
« Last Edit: June 21, 2014, 05:13:27 am by PA0PBZ »
Keyboard error: Press F1 to continue.
 

Offline theatrus

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Re: HP 5314A Universal Counter Teardown
« Reply #9 on: June 21, 2014, 03:37:23 pm »
A fused BNC? That's a new one to me
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Offline MudMan

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Re: HP 5314A Universal Counter Teardown
« Reply #10 on: October 28, 2016, 07:41:33 am »
I got a used 5314A and need a readable schematic. I downloaded the manual from Keysight and also searched the Internet, but all I found was unreadable. Anybody out there who can help me? ::)
 

Offline villas

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Re: HP 5314A Universal Counter Teardown
« Reply #11 on: October 29, 2016, 01:56:32 am »
I've got one earlier this year. Mine came with original battery (dead as expected) with '79 date code on it.

Led display became orange, but still readable.

 


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