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Test Equipment Anonymous (TEA) group therapy thread

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duckduck:

--- Quote from: duckduck on June 22, 2022, 07:41:05 pm ---New acquisition: [(hp)] 34401A 6 1/2 digit bench multimeter

Also part of the same Craigslist buy. I couldn't get it to read an AC measurement or a frequency measurement but I didn't bring anything and I had limited equipment/time available to test with. I should really buy one of these small multimeter calibrators. I could bring it on shopping trips with my Fluke 87V DMM and it would probably pay for itself after a few Craigslist buys.

The Bad:
* Does not make measurements when in AC or Frequency modes.
* Fails self-test with the following errors:
     620 - AC rms zero failed
     621 - AC rms full scale failed
     622 - Frequency counter failed
* No folding bale
* VFD is dim

<SNIP>

--- End quote ---


--- Quote from: Zucca on June 22, 2022, 07:44:28 pm ---The 34401A is spreading like rabbits. Do not worry about the failure, they are such a fun to fix...
Congrats!

--- End quote ---

Zucca, you called it. That was about the dumbest fix of all time. Monkey look at PCB, monkey see two burned-up-looking components, monkey order replacement components from Digi-Key, monkey replace components. I think a NASA soldering inspector would just shake his head, but at the end of the day I'm happy. Not too bad for USD66 plus USD12 in components (I bought extras in case I sneezed).

Vince:

--- Quote from: bd139 on June 28, 2022, 07:25:53 pm ---When colour scopes came out no one noticed. We didn’t even put the rings on the probes anyway  :-DD

As for the customer insisting they’re not stupid, that’s a fairly large assumption.

--- End quote ---

That's the point I just made... probe colours has nothing to do with the screen. Being able to change the screen colours is useful in its own right, has nothing to do with freaking probes, hence why it was implemented in the old TDS scopes where they recognized that basic, obvious fact.

Soon car makers will offer their cars in only one colour, the colour of your house, so that the two match. What if the owner wants a different colour ? No, your house is white, I will only sell you your car in white. Model T tried that with black IIRC, but somehow, go figure, over time people really wanted other colours, strange...

I am trying to decide if I should keep my BC307 and BC368 trannystors...

bd139:

--- Quote from: Vince on June 28, 2022, 08:04:46 pm ---
--- Quote from: bd139 on June 28, 2022, 07:25:53 pm ---When colour scopes came out no one noticed. We didn’t even put the rings on the probes anyway  :-DD

As for the customer insisting they’re not stupid, that’s a fairly large assumption.

--- End quote ---

That's the point I just made... probe colours has nothing to do with the screen. Being able to change the screen colours is useful in its own right, has nothing to do with freaking probes, hence why it was implemented in the old TDS scopes where they recognized that basic, obvious fact.

Soon car makers will offer their cars in only one colour, the colour of your house, so that the two match. What if the owner wants a different colour ? No, your house is white, I will only sell you your car in white. Model T tried that with black IIRC, but somehow, go figure, over time people really wanted other colours, strange...

I am trying to decide if I should keep my BC307 and BC368 trannystors...

--- End quote ---

I'll have any colour as long as it's black  :-DD



As for the BC307 and BC368, best to think about it in this way:

TUN and TUP. Transistor Universal NPN and Transistor Universal PNP:

https://www.mikroe.com/ebooks/components-of-electronic-devices/tun-and-tup

Or just do what I did which was throw them all away by accident and just buy a shit ton of 2n3904, 2n3906, pn2222a, bd139 and bd140 and be done with it (that's 90% coverage of all normal electronics requirements)

Neomys Sapiens:

--- Quote from: AVGresponding on June 28, 2022, 05:41:47 am ---

https://www.eevblog.com/forum/dodgy-technology/the-non-linear-plasma-reactor/msg4265899/#msg4265899

--- End quote ---
Is this hairy-brained guy by any chance related to the notorious Ivor Catt? His persistence strikes me as very similar!

Cerebus:

--- Quote from: bd139 on June 28, 2022, 08:01:05 am ---
--- Quote from: McBryce on June 28, 2022, 07:41:36 am ---So I printed the PH-163 casing. Fit's perfectly and seems relatively safe to use, but the creator neglected to mention which terminals he used. Has anyone an idea what terminals would fit the PH-163 pins? Or what terminals these are in his picture? https://3dmixers.com/m/268285-ph-163-connector-hp-oval-

McBryce.

--- End quote ---

Did you print it in PLA? It's hygroscopic. I wouldn't put mains near it.

My approach on these in the future are going to be making a blanking plate with a cable strain relief and either a dangling IEC socket or a captive mains lead.

Although I managed to avoid that at the weekend with the 400E as it had an IEC already

--- End quote ---

PLA may be hygroscopic, but so's nylon, and that's used as an insulator.

For the record, volume resistivity of PLA is 49-55 x 1016 \$\Omega\$m (depends on which crystal form). By comparison XLPE* (widely used for high voltage insulation) is 46 x 1016  \$\Omega\$m.

*Crosslinked Polyethylene

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