Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
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tautech:

--- Quote from: Cubdriver on July 07, 2022, 04:26:13 pm ---
--- Quote from: bd139 on July 07, 2022, 04:07:13 pm ---So sitting here cleaning test gear again.

Anyone got any ideas what might remove this horrible idiot graffiti on the panel? Isopropyl doesn’t touch it.

--- End quote ---

Cold chisel?  <ducking>

-Pat

--- End quote ---
Dremel  :P
mnementh:

--- Quote from: Cubdriver on July 07, 2022, 04:26:13 pm ---
--- Quote from: bd139 on July 07, 2022, 04:07:13 pm ---So sitting here cleaning test gear again.

Anyone got any ideas what might remove this horrible idiot graffiti on the panel? Isopropyl doesn’t touch it.

--- End quote ---

Cold chisel?  <ducking>

-Pat

--- End quote ---

Duckling butt?

mnem
*dodges barrage of cold chisels like Matrix Bullet-time*
Zoli:

--- Quote from: AVGresponding on July 07, 2022, 08:03:42 am ---
--- Quote from: bd139 on July 07, 2022, 07:19:35 am ---
--- Quote from: Specmaster on July 07, 2022, 07:13:09 am ---
--- 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 ---
I've just checked my bench meters and was pleasantly surprised to discover that my oldest meter, HP 3466A also gave me the highest voltage in diode mode of 4.6V and handhelds only giving me 3.2V, one more reason for keeping the HP then  :-DD

--- End quote ---

Yeah I measured the 3465A. It doesn’t have a diode mode. You stick it in 1K ohms and it works. 4.6V too. Same circuit probably.

--- End quote ---

The O/C voltage can be misleading; none of the mentioned meters will measure as far as that I'll bet. Vince likes his Metrix MX-series, and they have an O/CV of ~4, but won't give a reading on a white LED, despite making it light. The forward voltage of this diode is 2.7V according to my Fluke 289, which has an O/CV of 5.4 but will for sure not measure above 3V or so, and the same applies to the Fluke 89 V which has an O/CV of 7.3, and will light two 2.7V white LEDs in series, but will not give a reading.

--- End quote ---
The important part is to see if the LED is lit up in the first place; voltages should be checked under working conditions, NOT on multi-meters.
Zoli:

--- Quote from: AVGresponding on July 07, 2022, 04:37:01 pm ---
--- Quote from: Zoli on July 07, 2022, 04:34:45 pm ---
--- Quote from: vk6zgo on July 07, 2022, 09:16:56 am ---
--- 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

--- End quote ---
So the Fluke 8060A is new and fancy for your Fluke 77? :-DD :-DD :-DD
Side notes:
1. I've measured my 75 seriesII diode voltage: 2.5V; the 77series I&II should be the same
2. You don't really need 3.2V to lit up the blue/white LED's; 2.8V is usually enough

--- End quote ---

Yes, but what is the maximum reading you can get?

--- End quote ---
The maximum reading is what the manufacturer is programmed in the unit; for details, Read The Fine Manual(I'm pretty sure that you have it)  >:D :-DD :-DD :-DD
Zucca:

--- Quote from: bd139 on July 07, 2022, 04:45:55 pm ---First winner on that one. Much better now. Thank you

--- End quote ---

I have a couple of TEA boxes that would need your services.... new business opportunity for you?
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