Products > Test Equipment

121GW RF Issue

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joeqsmith:

--- Quote from: GuidoK on September 03, 2023, 11:57:09 am ---
--- Quote from: EEVblog on September 03, 2023, 11:25:03 am ---
--- Quote from: joeqsmith on September 02, 2023, 07:02:12 pm ---From my testing, Brymen has proven to be right there with the name brands.  Not only some of the most electrically and mechanically robust products on the market but also are withstanding the test of time.
--- End quote ---

As someone who sells a lot of Brymen's, I can attest that they have a noticeable non-zero long term failure rate. It's not high, but it's certainly not zero.

--- End quote ---
No brand has a zero long term failure rate.

--- End quote ---

True.  When I worked in automotive, we would burn-in our products to address the infant mortality.   If anyone is interested in a book on reliability, see attached.   It doesn't really cover the basics like burn-in but is more advanced.  Heavy math.

Thanks everyone who ran their 121GW in the mVDC mode.   I spent some time today to see if I could sort out why mine is so unstable.   

EEVblog:

--- Quote from: joeqsmith on September 03, 2023, 11:41:40 pm ---Thanks everyone who ran their 121GW in the mVDC mode.   I spent some time today to see if I could sort out why mine is so unstable.   


--- End quote ---

Your meter may not have the extra shielding that was added quite a few years ago now.

joeqsmith:

--- Quote from: EEVblog on September 04, 2023, 01:11:15 am ---
--- Quote from: joeqsmith on September 03, 2023, 11:41:40 pm ---Thanks everyone who ran their 121GW in the mVDC mode.   I spent some time today to see if I could sort out why mine is so unstable.   

--- End quote ---

Your meter may not have the extra shielding that was added quite a few years ago now.

--- End quote ---

That's certainly possible. 


--- Quote ---Looks like I purchased the two 121GWs from Dave around 11/3/2019.
--- End quote ---

Post a few photos of the current shielding and I will pull mine apart and post a few of what I received. 

***
Attached showing one of the production meters.  These were purchased at the same time and from what I remember had the same construction.

EEVblog:

--- Quote from: joeqsmith on September 04, 2023, 01:19:22 am ---Attached showing one of the production meters.  These were purchased at the same time and from what I remember had the same construction.

--- End quote ---

That does have the shielding.
What firmware are you running? Try the latest version.

BillyO:

--- Quote from: EEVblog on September 03, 2023, 11:10:56 pm ---So don't necessarily expect your Brymen to last 20 years. One of the failure modes seem to be related to some sort of processor die rot.

--- End quote ---
That's not great to hear.  I have a 45 year old RadioShack DMM that's still going strong.  20 years should be nothing, especially for what my  Brymen BM786 cost.

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