Products > Test Equipment
HP 53131A vs 53132A hardware differences
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daddioo:
Calibration solved, luckily I had the function generator, I did step by step as the service manual said, I did the CAL: OFFS 1 and 2 (0V) then CAL: GAIN 1 and 2 (5V) and then CAL: TI QUIK ? 10Mhz square wave 1V peak peak, doing all this disappeared the writing UNCALIBRATED.
Thanks everyone for your help
Joseph
alexvinassa:
Hi ytsejam and Hi to everyone!
looking at the photo attached to reply 14,It seems to me that you use two identical FPGA, the XC3142A 84-PLCC instead of one XC3142 (U58) and one XC3042 (U59). Does the circuit work correctly? Are the two fpga identical? Of course, with only one type of fpga is more practical. Thanks for your attention!  :-+
switchabl:
According to the datasheet (https://www.mouser.com/datasheet/2/903/3000-1595472.pdf), the XC3100A are pin- and bitstream compatible with the XC3000A but they can run significantly faster. So, yes, if you can't re-use the original U58 XC3042A for some reason,  you could use two XC3142A instead.
alexvinassa:
yeah, I have come to the same conclusion as you! I will order all the components (aliexpress  :-X and mouser), I want to try this upgrade! I'm mainly driven by recklessness, but.. you have to have fun somehow!
nostril:
Hi all,

Write me up as one of the successful 53131A to 53132A conversions. I have what's presumably a still-to-be-located scratchy solder joint causing intermittent MEAS and INTERP failures under cold conditions. But aside from this, I now have 12 digits per second if I let things warm up, or twist the board just right. Actually the fault is getting harder to reproduce the more I prod around (Murphy!!!) I seem to have fixed the intermittent issue by blasting under some chips with isopropyl+air, out came one or two very small solder balls. Perhaps they were just large enough to cause issues. But I can no longer reproduce the MEAS and INTERP failures except shorting two of the pins near where the ball came out (data line to gnd). I had one faulty joint (pin 29 on U59) but I couldn't reproduce the bug by lifting it to GND or VCC.

I now have 12 digits per second on my "53131A".

I would like to confirm a few things to add to the public knowledge around this hack since detailed internals of genuine '32s were hard for me to find to confirm some stuff before trying this hack:

* I made all of the component replacements in the spreadsheet earlier in the thread.
* All other passive components were sourced from Mouser using exact part number matching from the CLIP for maximum authenticity ;)
* I sourced the two ADCs from Aliexpress. Took a gamble here but I found someone had reviewed a listing from a seller as being non-fake.  :-//  Probably someone recent from this thread :)
* I used a 3142 and a 3042 FPGA per the 53132A CLIP, and not two of 3142. Again, sourcing-wise I took a roll of the dice here, but the same Aliexpress ADC seller had the 3142 FPGA in stock too.
* I upgraded the SRAM to the 15ns IDT part number from the CLIP. I didn't bother trying with the original slower RAM as it may only have manifested as intermittent problems due to overclock. Not worth my time. This was obtained from an eBay seller with a fairly high (at least, high for a chip reseller) seller rating.
* MC1403D reference was obtained from another eBay seller with a similar rating
* I forgot to add it to my Mouser order, and I didn't yet want to burn the original EEPROMs even though I've backed them up... you never know... So I bought 4x AM29F010B from eBay as well. Ironically one of these ended up being the only non-working chip. Go figure. I can only speculate it is more likely to get counterfeits of popular chips that can be sold at volume?
* I found there are two resistors missing from the delta/difference spreadsheet. This is a BOM change from 100R to 422R (R195 and R196). I'm not expert enough to determine if this makes any material difference.
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