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Old 10-21-2020, 08:26 PM   #21
redwire
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Default Re: MAX134CMH+D A/D Converter: Faulty or OK?

Let us know when the chip comes in. I can't see any other parts that would give the same problems.

I've worked a few projects in GP, it's a bit north for my liking.
First snow a few days ago and record cold snap -10C/+15F for this time of year. Polar vortex brrr.
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Old 01-21-2021, 11:40 PM   #22
Krisby
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Default Re: MAX134CMH+D A/D Converter: Faulty or OK?

Update:

Some time ago I took delivery of a new MAX134 ADC and soldered it into the Protek 506 DMM. However, the DMM is still not working correctly; the fault has merely changed in it's characteristics! I thought perhaps I may have damaged the chip by exposing it to too much heat, but, then again, it may have been a reject dud chip to begin with!

I've now taken delivery of two more MAX134, as well as a practice PCB with a practice 44pin MQFP IC, so that I can perfect the soldering technique before attempting on the DMM itself.
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Old 01-22-2021, 06:54 AM   #23
stj
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Default Re: MAX134CMH+D A/D Converter: Faulty or OK?

i would have just swapped parts with the other meter till the fault moved.
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Old 01-23-2021, 06:16 AM   #24
Krisby
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Default Re: MAX134CMH+D A/D Converter: Faulty or OK?

stj: a lot of components are SMD (SMT), but I may have to test/replace everything until I find the fault. I refuse to give up on this meter!

I've been trying to purchase an Evaluation Kit for the MAX134, but it is now obsolete and nobody has any in stock, that I can find. The model number is MAX134EVKIT#. The board has the MAX134 on it, a microcontroller with software and a LCD. It would be a good tool to get to understand the basics of a DMM.
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Old 01-23-2021, 06:38 AM   #25
stj
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Default Re: MAX134CMH+D A/D Converter: Faulty or OK?

i know it's SMD,
i'm doing some smd work as i type - hot air is not expensive
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