Products > Test Equipment
HP/Agilent 34970A Teardown
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BravoV:

--- Quote from: nanofrog on February 14, 2013, 10:10:11 pm ---Don't have the scope yet, so I've not had the chance to actually see anything other than a photo of the U800.

--- End quote ---
Here in this forum, made a teardown thread on my 2465B which is quite identical to 2445B -> here
nanofrog:

--- Quote from: BravoV on February 15, 2013, 04:34:04 am ---
--- Quote from: nanofrog on February 14, 2013, 10:10:11 pm ---Don't have the scope yet, so I've not had the chance to actually see anything other than a photo of the U800.

--- End quote ---
Here in this forum, made a teardown thread on my 2465B which is quite identical to 2445B -> here

--- End quote ---
Thanks, this helps a lot.  :) BTW, I'll probably borrow your heatsink idea (looks really nice).  ;D
Rick:

--- Quote from: BravoV on February 15, 2013, 04:34:04 am ---
--- Quote from: nanofrog on February 14, 2013, 10:10:11 pm ---Don't have the scope yet, so I've not had the chance to actually see anything other than a photo of the U800.

--- End quote ---
Here in this forum, made a teardown thread on my 2465B which is quite identical to 2445B -> here

--- End quote ---

On that thread, why don't you shape your heatsink so that it extends up to the bolt because the bolt is in contact with the bottom metal of the IC: http://www.qservice.tv/N_PICS/PICS_TEK_SPARES/ALL_9F/EX_LARGE/DSC09382.JPG
It's better than cooling only the body of the IC through that black body isn't it?
And instead of the bolts you could insert some more metal to elevate the bottom metal to the top level of the black body so that it touches the heatsink...
BravoV:

--- Quote from: Rick on February 15, 2013, 06:05:56 am ---On that thread, why don't you shape your heatsink so that it extends up to the bolt because the bolt is in contact with the bottom metal of the IC: http://www.qservice.tv/N_PICS/PICS_TEK_SPARES/ALL_9F/EX_LARGE/DSC09382.JPG
It's better than cooling only the body of the IC through that black body isn't it?
And instead of the bolts you could insert some more metal to elevate the bottom metal to the top level of the black body so that it touches the heatsink...

--- End quote ---
Rick, thanks for the suggestion, yes, I'm aware of optimizing the heat path, totally agree on metal beats plastic when it comes to heat conduction.

Actually that is only temporary solution, I'm planning to desolder the whole U800 IC and put a custom cut copper to cool it directly from below and I already have an idea how to proceed next, yes, I have the photo how that U800 ic bottom looks like. Too bad its just I travel a lot, just don't have time and commitment to do a major big surgery on that big ass A1 board yet.  :'(

Geezz.. this is becoming off topic from this original thread's subject, sorry Vincent  :-[ , and if you want to proceed this discussion on improving U800 cooling, I will be really glad if we could continue this interesting subject in that thread of mine, and I will post the photo of U800's bottom as well to get possibly better idea to cool it better.
KJR:
Found this post while trying to resurrect a 34970A with "all segments showing on front panel" issues.  What you posted is/was incredibly useful, thanks much for the effort to document your work.

FYI anyone else going down this rabbit hole, the equiv part that's readily available (for those of us without nearby bins of parts for $1 each) is the Allegro System A6818; I found a couple of vendors with Min Order Quantity of 1 at $5 each + reasonable shipping + 2 weeks wait on Ebay. 

Regards,

Kurt
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