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Test Equipment Anonymous (TEA) group therapy thread

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vk6zgo:

--- Quote from: Zoli on July 07, 2022, 06:06:33 am ---
--- Quote from: Vince on July 06, 2022, 05:58:52 pm ---...
As for DMM's, I don't have fancy modern ones that can test white LEDs.
...

--- End quote ---
You don't need a new and fancy DMM to test the LED's; as example, my DMM870(1998) gives 3.2v,  and the 8060A gives 8V in diode testing mode, both enough to light up any LED's.
That's why I've asked to check your multi-meters, so next time you will know which is suitable for LED testing(is part of "Know your tools" training)  >:D :-DD :-DD :-DD

--- End quote ---

That's "new & fancy" to me!
My Fluke 77 won't turn on blue LEDs, either, as they also require 3.2v.

My "bodge tester", consisting of a 9v battery, a 360 \$\Omega\$ resistor, a switch, and a small "junk" pin connector does, though!
(I dunno how I happened to have 360 \$\Omega\$ resistors & not 330 \$\Omega\$, but that's what my junk box had!)

An old ADSL box teardown yielded some nice blue LEDs with long leads, plus two bicolour ones.(red & blue, so if I ever need  a purple light, I'm in good shape!) ;D

tggzzz:

--- Quote from: med6753 on July 06, 2022, 08:41:45 pm ---End of an era. I've had that same roll of 60/40 for perhaps 40 years.

--- End quote ---

Mine is ~38 years old. Can't be more than 36.

med6753:

--- Quote from: bd139 on July 07, 2022, 07:42:44 am ---Good write up as always  :-+

Might have to refurb this 465B yet. Still waiting for that IC to turn up.  Hopefully today. If it checks out I’ll do a full clean and cal on it and sorted.

--- End quote ---

I didn't know yours had a bad IC. That must of happen when I was on vacation. I have a 465B parts mule and I would have given you the IC for cost of shipping only.

bd139:

--- Quote from: med6753 on July 07, 2022, 09:34:10 am ---
--- Quote from: bd139 on July 07, 2022, 07:42:44 am ---Good write up as always  :-+

Might have to refurb this 465B yet. Still waiting for that IC to turn up.  Hopefully today. If it checks out I’ll do a full clean and cal on it and sorted.

--- End quote ---

I didn't know yours had a bad IC. That must of happen when I was on vacation. I have a 465B parts mule and I would have given you the IC for cost of shipping only.

--- End quote ---

Yeah was a few days back. Details here:

discovery: https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg4268857/#msg4268857

workaround: https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg4268941/#msg4268941

first power up: https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg4268986/#msg4268986

Dang it  :-DD. Paid £23 for a replacement NOS part here  :-DD

Cerebus:

--- Quote from: Robert763 on July 07, 2022, 06:56:09 am ---One fervently hopes that those LEDs are driven by an active constant current source. Shorting out one or two does not stress the other LEDs in the string. It does affect the CC driver but probably not enough to reduce it's reliability.

--- End quote ---

FTFY

Relying on someone doing things the way they should have been done can be foolhardy.  :)

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