Electronics > Repair
Agilent 34401A Bubble on PCB ... can it be saved ? (SOLVED)
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Dr. Frank:

--- Quote from: The_Spectrum.A_idiot on September 24, 2024, 05:21:55 pm ---
--- Quote from: Dr. Frank on September 24, 2024, 05:04:47 pm ---and the other currents, 5µA and 10µA?

Does it now pass the test?

That means, DIP 8 is obsolete, and you have used an SOIC / DIP adapter? Or was it an SO package initially? I don't remember..
This type is correct, anyhow

--- End quote ---

Well I managed to solder it on .. regardless if it was a different package ... pinout was the same so I just made due.

--- End quote ---
That's sub optimal. Please have a closer look for possible contamination or solder bridges, with your nice microscope
The_Spectrum.A_idiot:

--- Quote from: Dr. Frank on September 24, 2024, 09:30:08 pm ---
--- Quote from: The_Spectrum.A_idiot on September 24, 2024, 05:21:55 pm ---
--- Quote from: Dr. Frank on September 24, 2024, 05:04:47 pm ---and the other currents, 5µA and 10µA?

Does it now pass the test?

That means, DIP 8 is obsolete, and you have used an SOIC / DIP adapter? Or was it an SO package initially? I don't remember..
This type is correct, anyhow

--- End quote ---

Well I managed to solder it on .. regardless if it was a different package ... pinout was the same so I just made due.

--- End quote ---
That's sub optimal. Please have a closer look for possible contamination or solder bridges, with your nice microscope

--- End quote ---

Thank you for getting back to me ,

Well I will have a look , but I don't have much hope. ( it was pretty flush with the PCB )

If that ends up to be a dead end. what are other possibilities ?

Thanks
Dr. Frank:
you might replace U201 with another sample, maybe you created an ESD damage when assembling the new component.
And as said, I assume you can use the instrument with a fresh calibration in most modes / ranges.
The_Spectrum.A_idiot:

--- Quote from: Dr. Frank on September 24, 2024, 10:01:28 pm ---you might replace U201 with another sample, maybe you created an ESD damage when assembling the new component.
And as said, I assume you can use the instrument with a fresh calibration in most modes / ranges.

--- End quote ---

Okay , hopefully I will be able to pull it of in an ESD safe environment ,

I bought off ebay original agilent part number parts. Hopefully by next week they will be in my possession , If I can't find a solution for this I will most probably just swap the original part and then send it for calibration and hope that they can calibrate it in fault mode. ( I think they are not accepting devices for calibration and certification if they fail any of the self tests ... am I correct ?

Thanks
The_Spectrum.A_idiot:


 :box: :box: :-+ :-+ :clap: :clap: IT PASSED !!!! :box: :box: :-+ :-+ :clap: :clap:

After re-checking every solder joint , every flux residue , anything and everything on the PCB.

3 things.
Dr.Frank - Thank you for everything for all the valuable advice and helping me every step of the way !!! the IC being the wrong footprint and pointing that out put me into thinking !!
Kleinstein - You were right and I was wrong there was some pesky flux hidden under the IC so contact cleaner and IPA and passing KIMTECH wipe under the IC for 1h it finally worked :D

Everyone else that spend time helping me out and pointing out obvious things that I didn't know and helped me through eveything step by step I would like to tell you a huge thank you !!

Now off to calibration house :D !!! Hopefully they won't need and arm and a leg :D

Thank you in advance for your help , for your time , and your patience !!!

The Spectrum

p.s.: The Ohms values :

Results :
000. ohm range -997.0 μA
0.1k range - 997.0μA
00.1k range -99.44μA
000.1k range -9.98μA
0.1M range -5.00μΑ
00,1M range - 0.52μΑ
000,1Μ range -0,52μΑ
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