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Test Equipment Anonymous (TEA) group therapy thread
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Specmaster:

--- Quote from: nixiefreqq on July 02, 2022, 12:43:27 am ---<snip>

gotta' agree with the dragon on this one.

with those two T-15 screws missing from the back the cabinet will almost fall off on its own.  (don't ask how i know)

even if you did not know there was supposed to be a display board inside, how could you not notice the ribbon cables hanging loose inside?

will be interesting to see how it all plays out.

edit  just looked and there are supposed to be 3 screws back there.  mine is missing one.



--- End quote ---
Agreed about the screws and the ribbon cable hanging loose etc, but I'm talking about the dragons claim that it is "not being as described", if you actually read the sellers description of the item, it fits the description precisely as the seller states

   "Condition:    
   
Overall Condition    AS-IS (Please view all pictures)
Cosmetics    Please view all pictures
Completeness    As seen in pictures
Functionality    AS-IS (Powers on / Unable to test further)"

They do mention that it was missing the handle, hence why I asked the dragon "Have you powered it up?, did the lights come on? ", if so then it matched the description as the seller also states that the unit is as shown in the photos. I was playing "Devil's advocate".

Now I may be totally wrong here, but I suspect that the seller is not a one-man band and so it is a reasonable assumption that the item might have been tested and packed by someone who does not have a clue what they are doing, maybe a school-leaver etc., the back may not have come off while they were wrapping it, therefore they would not have known the ribbon cables were hanging loose inside, who knows  :-// :-//


tggzzz:

--- Quote from: bd139 on July 02, 2022, 07:23:26 am ---This is extremely cool for an electronics book.

No Starch Press. Open Circuits: The Inner beauty of electronic components:

https://nostarch.com/open-circuits

Chapter 1 PDF https://nostarch.com/download/OpenCircuits_Chapter1.pdf

I will buy a hard copy of that when it comes out.

--- End quote ---

I've seen that before, and I like the the diagrams, clarity of the photos, and the brevity of the informative description. Brevity is all too rare nowadays.

That there are also diagrams and information indicates that careful thought has gone into how to educate the reader. Also all too rare nowadays.

<Carefully avoids standard diatriabe about yootoob talking-head vids, for brevity>
tautech:

--- Quote from: Vince on July 01, 2022, 11:35:57 pm ---


--- Quote from: tautech on July 01, 2022, 10:57:59 pm ---
--- Quote from: tautech on July 01, 2022, 08:21:53 pm ---
--- Quote from: Vince on July 01, 2022, 02:01:39 pm ---Forgive the dumb question, but why not just put that tool in a vice to squeeze it smoothly instead of hammering it ?!  :-//
The smooth progressive action of the vice would be kind to the lug wouldn't it.

I mean a real big/full size garage vice of course, not the tiny vice we use in the lab, that goes without saying ! ;D

--- End quote ---
With a little care you can indeed make very serviceable crimps in a vise if you know how.
Not so much with the smaller cable sizes however in a permanent installation where there will be zero vibration or rarely a need to disconnect it, then bucket type lugs, those without a opening at the bottom of the bucket then soldering on crimps works just fine however a cleaner job is done with a Propane torch rather than Oxy/Acetylene.

Crimps in the vice with commercially or homemade lugs really need a reasonably heavy wall lug to withstand the compression as only 2 sides of the crimp are contacted on.
First you need a crimp that well matches the cable size and then the Hex head of a bolt or stout nut for just one of the Hex faces to be squeezed into the side of the barrel of the crimp to leave a deep rectangle pressed into the crimp.
I've used this method with 100% success over many decades on heavy welder leads and with a couple of layers of shrink sleeve for strain relief it's a quick solution if you don't have some blowtorch handy or your sparky mate with the good crimpers has gone AWOL.

Edit
However care must be taken where one might do such non-standard procedures so to properly consider the risk to life, limb or property.

--- End quote ---
Hey Vince, about the vise crimp we're trying to achieve with a Hex nut or bolt head, similar to this done with a commercial tool with a plunger pressing into a Vee .... this one a double - crimp some are + plungers.

Anyways, just the flat of a Hex done longways or across the lug depending on the size of the lug and the bolt/nut hex used to squeeeeze it together.
This is for a pis ant old and little 140A caddy welder lead, didn't check but probably 25mm2 cable and 13mm hole in the lug. Muppets that made it couldn't even be bothered to sleeve it for bending strain relief so it's starting to show signs of early failure.  :horse:

Final word:
Any lug crimp for mains must be done with approved tools to meet compliance.......trying to get my sparky mate's old crimpers that he can no longer use for NZ mains work and comply with a COC. (cert of compliance)

--- End quote ---

OH it looks like this lug is soon to part with that wire ! :-DD

Time to get that Hex bolt and vice in action, replace that crimp and show us nice pictures ! I am waiting !  >:D


Going to bed, good night....   :=\

--- End quote ---
Sorry buddy, not happening as it's a welder I rarely use and therefore as sad as the joint looks it will last me until I am no more.  ;)
However AWOL Sparky mate dropped by today and we had a chat about crimped lugs and here in NZ now only Hex crimps are permitted for any mains feeds and crimp lugs must match cable size used and with the correct Hex die selected which when all are properly matched and a properly tight crimp made the mirrored cable/crimp size in the Hex die is formed into the lug upon crimping.
This results in the electrical inspectors just requiring a glance to know if the crimp has been properly done.
Just sometimes officialdom has some good legislation !
Vince:
Dear Kiwi,

I am extremely surprised by your reaction and I shall soon be seeking experienced, professional psychological help in order to recover, heal, overcome.... this traumatizing, severe disappointment.   :horse:



Specmaster:
Seen today on Ebay UK, anybody requiring a 50Mhz LA, starting bid of only £15...

https://www.ebay.co.uk/itm/255609408885
WTF is this?
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