Products > Test Equipment
HP/Agilent 1675x logic analyzer card memory up-hack
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MarkL:

--- Quote from: perdrix on February 13, 2018, 04:32:17 pm ---Did anyone who has both 16717A and 16719A boards ever find the time to compare to see it the 16717A can be upgraded too (I'm up for upgrading the ROM ICs if I can find suitable ones).

If necessary I can pull a 16717A from the analyzer and take pix. 

Or are the 16718A/19A different beasties altogether?

Thanks
Dave

--- End quote ---
I have a 16717A and it's nothing like the 16719A, looking at pictures on ebay.  Also, a count of the populated memory on the 16717A says there's no unused memory laying around waiting to be activated.

I've never heard of any options for upgrading memory chips on these cards.  The memory is a 64-pin package and there's 34 of them.  Seems like a lot of work even if it was possible.

The 16719A looks a lot like the 1674x and 1675x series, but there's not sufficient resolution in the photos to figure out what memory is populated on it.  One photo that's on ebay right now has a sticker indicating it's a 16719A.  I wonder what's under the sticker...
Patrick.M:
Mark,

Not any time soon. I'm all good on the idea of unlocking sequestered memory, but not so sure that changing from a slower class to a faster class of a digital product actually works as well as expanding the memory. My pessimistic thinking here says one could be yield issues, say with the gate array, ADC driver with some fixed calibration for that unit that relegated it to a slower product class. Just thinking.

With this, does anyone know if changing a16533A (250 MHz. 1Gs) scope to the 16534A (500 MHz. 2Gs.) with test results? I'm reluctant to do anything with mine. Even though I can see no differences between the two PCBs what so ever.
texaspyro:

--- Quote from: Patrick.M on April 02, 2018, 09:37:38 pm ---With this, does anyone know if changing a16533A (250 MHz. 1Gs) scope to the 16534A (500 MHz. 2Gs.) with test results?

--- End quote ---

I don't have any formal test results, but I have been using some upgraded 16533A's for years without any issues.    I just swapped the resistors and ran the calibration routine.   
Patrick.M:
I'm fast becoming convenced it's the real-deal. I just wen't over my 1533A and 1534A and discoved that both have the same type markings on the chips. Two actually say 1534A on both boards. The front end attentuator module even has the same 1534A markings. I guess engineers are clever at geting components to do what we wan't them to do, so why shouldn't marketing engineers allow a feild engineer to perform an upgrade to lower end products, conveniently in the field, impressing certain customers who ghen may become very loyal.

I'm doing the R swap today and will let youall know.
texaspyro:
I once bought a couple of expansion chassis that had 16533A's in them.   I noticed that those two resistors were hand soldered (flux residue) and the 16533A's had stickers for the model number applied over the 16534A on the board.   That clued me in that it was upgradable.   I checked a 16534 and found the resistor swap.   I suspect that HP builds 16534's and downgrade them when somebody buys the low end version.
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