Test Equipment Anonymous (TEA) group therapy thread

[Cerebus]

Also bear in mind, they are center-tapped earth on the secondary, so do not try to bond earth to neutral...[/b]

I would NEVER do that, except in ONE place. If, and only IF, you get your feeder from the utility company as a 3 phases plus PEN, which I do, there is a point in the fuse panel where Neutral busbar and Ground busbar are joined. PEN is connected adjacent to this point, and further out in the network, blue and green/yellow never mix.

Further, as a principle, I treat phase and neutral as live conductors in ANY single-phase situation. That way, I never ever have to bother with polarity.  Our plugs (we're on the same standard as Germany, i.e. Schutzkontakt CEE7/4 and europlug CEE 7/16) aren't polarized, so as soon as one's used an extension cord or a multiple outlet, polarity is stochastic.

Bonding the center-tap on the transformer secondary is both possible and (looking at security) desirable. Also serves to teach the poor uneducated about both poles of a mains flex best being regarded as dangerous.

This is done for specifically for construction sites and nowhere else. The idea is to ensure that that both sides of the line (it makes little sense to talk of live and neutral) are close to ground compared to a normal supply. Reducing both sides to 55V_rms away from ground is a lot better than what would be the usual arrangement in the UK of having 240V_rms to ground.

[Mr. Scram]

I can find pretty much all my electronics kit except for the bloody IC box. Almost all the op-amps and shift registers and what not I own not which aren't in actual equipment are in there.  The upside is that I found my microcontroller box.

I had to dig up half the storage unit but I found it. Found my useless decade box too, and various other bits and bobs that'll keep me entertained.

[AVGresponding]

Also bear in mind, they are center-tapped earth on the secondary, so do not try to bond earth to neutral...[/b]

I would NEVER do that, except in ONE place. If, and only IF, you get your feeder from the utility company as a 3 phases plus PEN, which I do, there is a point in the fuse panel where Neutral busbar and Ground busbar are joined. PEN is connected adjacent to this point, and further out in the network, blue and green/yellow never mix.

Further, as a principle, I treat phase and neutral as live conductors in ANY single-phase situation. That way, I never ever have to bother with polarity.  Our plugs (we're on the same standard as Germany, i.e. Schutzkontakt CEE7/4 and europlug CEE 7/16) aren't polarized, so as soon as one's used an extension cord or a multiple outlet, polarity is stochastic.

Bonding the center-tap on the transformer secondary is both possible and (looking at security) desirable. Also serves to teach the poor uneducated about both poles of a mains flex best being regarded as dangerous.

Heheh, wasn't my intention to patronise... but I have seen some scary things that non-sparkies have done...

The IET 18th edition (what you have to know to be a sparky in the UK) incorporates some things that were revisions in the 17th edition, one of those is to define both line and neutral as live conductors (confusing some as live is now line, and neutral is now live...
     ) which is just another way to justify their existence imo (and the opinion of others), to whit; changing the nomenclature on a regular basis in order to force tradespersons to re-up and fork out more cash in order to stay certified.
Nevertheless, I agree in principal with treating neutral as dangerous, since in many situations it can be, not even necessarily a fault condition.
One of our senior (and now retired) electricians used to short neutral and earth in order to find what circuit a socket was on (he did at least make sure the sockets were on rcd/rcbo/gfci), and used to say regarding neutral in (large) 3-phase boards, "if you are fast, touching neutral doesn't hurt".

Fun times.

Side note: My Easter Weekend overtime is cancelled; the mains change at City Hall is postponed until next year, for obvious reasons...

[Brumby]

OMG ..... Looks like Med has inspired Daniel...

https://www.eevblog.com/forum/testgear/can-your-scope-do-this/

 

[Neomys Sapiens]

Could not resist, I found another of those really nice Power Designs power supply on ebay at a really reasonable price. This time it's model 2010 0-20v 1A.

One day I'll get one of these beauties. One day ...   

I've not even seen one offered! That 'One day ...' might be a long time off. And then we might be fighting over it.

With teeth, claws and Handflammpatronen!!!

[Neomys Sapiens]

well, since the pain is sitting mostly in my forehead I suspect a true Sinusitis which basically has gone downstairs and caused the usual inflammation, i.e. bronchitis. I'll get my inhaler tomorrow, the fever indicator is showing 37.04 (measured in the arm pit), my normal measurement would be 35.4

I suspect a flu or common cold, but should know better tomorrow.

As for the lens, when it hugged the ground the front element separated from the housing and rolled along the floor of the aviation museum of the pacific.
I suspect cleaning the sensors will not do the trick in this case ...

Seriously!

[mnementh]

   



   

Okay... dumb question, for anyone who knows about 3DP. Which of these fittings for the Bowden tube are supposed to be "the good ones" and which the "crap ones" ? They ALL look like cheap China-direct pneumatic fittings to me...

mnem
 

[Specmaster]

4503 update, dead battery clipped out to prevent further leakage through heat from desoldering, PCB thoroughly scrubbed with IPA, both sides and any corrosion on leads etc removed. Replacement battery ordered, stickers removed from case and the case cleaned, tilting bail removed before cleaning. Once battery arrives and its been reassembled, I'll some internal photos tear down photos for the record and post and hopefully it will then just need some slight calibration, last calibration was 3/11/2005. Before and after case photos below.

Before


After

[beanflying]

Okay... dumb question, for anyone who knows about 3DP. Which of these fittings for the Bowden tube are supposed to be "the good ones" and which the "crap ones" ? They ALL look like cheap China-direct pneumatic fittings to me...

mnem
 

Look inside the barrel is the first place to go. The bad ones lack grip points which is why they start to allow the tube to move in and out over time under extrusion pressure. The early Ender ones were only two points from memory. Other than that assuming you got fittings with your new Capricorn then trust them in particular if they were in a Capricorn Baggy.

[mnementh]

Okay... dumb question, for anyone who knows about 3DP. Which of these fittings for the Bowden tube are supposed to be "the good ones" and which the "crap ones" ? They ALL look like cheap China-direct pneumatic fittings to me...

mnem
 

Look inside the barrel is the first place to go. The bad ones lack grip points which is why they start to allow the tube to move in and out over time under extrusion pressure. The early Ender ones were only two points from memory. Other than that assuming you got fittings with your new Capricorn then trust them in particular if they were in a Capricorn Baggy.

You mean the number of fingers in the grip ring? I'll look into that. Thanks. 

I would've gotten the full Cap kit with fittings if they had it; only had the tubing in the Cap baggie. Pretty sure it's real Cap XS tubing; you can feel the slickery on the outside and the ID is 1.9mm as opposed to 2.05ish for that in the CReality kit. Difference is very visible too.

mnem
 

[med6753]

OMG ..... Looks like Med has inspired Daniel...

https://www.eevblog.com/forum/testgear/can-your-scope-do-this/

 

Huh? I fail to see how I am responsible or inspired that tomfoolery. 

[Cubdriver]

OMG ..... Looks like Med has inspired Daniel...

https://www.eevblog.com/forum/testgear/can-your-scope-do-this/

 

Huh? I fail to see how I am responsible or inspired that tomfoolery. 

You aren't, unless he does a follow-on video where he paints the enclosure blue...   

-Pat

[tautech]

OMG ..... Looks like Med has inspired Daniel...

https://www.eevblog.com/forum/testgear/can-your-scope-do-this/

 

Huh? I fail to see how I am responsible or inspired that tomfoolery. 

Agreed, nutthing to do with Med. 

Tomfoolery yes or more like diversionary tactics away from all the low series KS DSO's can't do Statistics. 
Really  what would be of more use on/in a DSO ? 

[beanflying]

I was tempted to include the clearly superior custom Siglent ones

[mnementh]

Fuck you, bean. 

mnem
We all thought it; I just said it.

[tautech]

Fuck you, bean. 

mnem
We all thought it; I just said it.

He's as sharp as a tack that Bean ! 

[VK5RC]

Finally worked out how to upload re-sized photos after a phone software 'upgrade '. D'oh.
Digital height guage - bit rough, but ok reviews.

[BU508A]

OMG ..... Looks like Med has inspired Daniel...

https://www.eevblog.com/forum/testgear/can-your-scope-do-this/

 

Yesterday: April fool's day.

[McBryce]

   Having ignored they "nay-sayers" and the why-bother gang, I went ahead and finished my 3D printed attachment for my DER EE DE5000 LCR meter. I can now connect my BNC Kelvin tweezers and probes to the meter.

McBryce.

  PPPPPPPTTTTTPPPPBBBBB!

That said... how did adding all that coax & connectors affect your accuracy & ability to zero out the poor fucker...? Net gain, or just more assache...?

In all honesty... I didn't mean to sound so negative; it just seemed a lot of work to try & achieve Lab-grade measurement process from a device which was designed primarily to be quick & versatile in connectivity yet reasonably accurate for diag work. Kind of the antithesis of what the DE-5000 is all about.

mnem
*currently hating the "oh, so close..." aspect of Murphy's Law*

I haven't wired it up yet. The PCB in the picture is still the 1.6mm version which doesn't fit into the meters slots. The 1mm PCB has arrived, but I haven't had a chance to cut and fit it yet. It shouldn't be an issue to zero it out. If it's properly shielded and the internal connections kept to a minimum length and seperated it should have results equal or better than the standard crocodile clip version.

McBryce.

You & I both know that "shouldn't be" & "should have" are BOTH Murphy's pups. I can see just the capacitance of all that extra coax fscking with your head bigtime. Good luck, my friend.

mnem
The Devil, she never sleeps.

Yes, but we won't be able to answer that question until I actually build and test one.

And to answer your 3D question above. I've had best results with the brass coloured fitting on the far right of your pictures.


McBryce.

[BU508A]

Could not resist, I found another of those really nice Power Designs power supply on ebay at a really reasonable price. This time it's model 2010 0-20v 1A.

One day I'll get one of these beauties. One day ...   

I've not even seen one offered! That 'One day ...' might be a long time off. And then we might be fighting over it.

With teeth, claws and Handflammpatronen!!!

Mit Geduld, List und Tücke, fängt man eine Mücke.     

[med6753]

OMG ..... Looks like Med has inspired Daniel...

https://www.eevblog.com/forum/testgear/can-your-scope-do-this/

 

Yesterday: April fool's day.

That's right, it was. But given the current state of world affairs I think we can be forgiven that it wasn't important or wasn't even on the bottom of the "don't care" list.

[McBryce]

I switched over to CNN yesterday and was amazed that they were running and obvious April fools prank despite the crisis, then I realised it was just Trump giving a speech on how he evaluates the current situation

McBryce.

[Brumby]

Am I the only one who got flashbacks of a certain fan mod?

[Specmaster]

Cheers Ice-Tea, you pre-empted me stubbing my right foot into a wooden storage chest that we have in our hallway in the early hours of the morning while attempting to catch a very naughty cat who didn't want to go to bed last night. It almost brought tears to my eyes. Had no sleep all night as it kept giving my shooting pains like someone was poking red-hot needles into my toes. Got up worked my way downstairs and took some painkillers and then sat up all night with the pain. Still doing this morning, no sign of an bruising or other damage just these regular shooting pains 

[Specmaster]

Am I the only one who got flashbacks of a certain fan mod?

Nope, but that was not an addition to a scope, but an attempt at replacing what was thought to be an unobtainable fan