Test Equipment Anonymous (TEA) group therapy thread

[Specmaster]

ya know.....I can never remember if its mnem or nmem or or mnen.   BUT TVOR.....I can remember TVOR.

I have the same problem, TVOR, I don't know that one but...PUFF I do know, Puff the magic Dragon.


Perhaps from this day forward mnem should be known as Puff 

[Specmaster]

No I've got a 465 as well

Currently have a 475A, 465, 2235 and TDS210

Wow, impressive list, I only have 2, PM3390B and TDS210 but there are both fully functioning   

Edit, technically 3 if you count a DSO138, also fully functional.

[nixiefreqq]

ya know.....I can never remember if its mnem or nmem or or mnen.   BUT TVOR.....I can remember TVOR.

I have the same problem, TVOR, I don't know that one but...PUFF I do know, Puff the magic Dragon.
Perhaps from this day forward mnem should be known as Puff 

well you just called yourself "the voice of reason".  if the shoe fits.....

[bd139]

No I've got a 465 as well

Currently have a 475A, 465, 2235 and TDS210

You haven't got a 465B junker there with a good attenuator switch do ya? 

If only ... the TDS210 is the only scope I have that works properly at the moment.

[Specmaster]

ya know.....I can never remember if its mnem or nmem or or mnen.   BUT TVOR.....I can remember TVOR.

I have the same problem, TVOR, I don't know that one but...PUFF I do know, Puff the magic Dragon.
Perhaps from this day forward mnem should be known as Puff 

well you just called yourself "the voice of reason".  if the shoe fits.....

Hmm, no, that was mnem or puff

[Berni]

Do any of you fine TEAers happen to have (or know where I can purchase) the rear panel bumpers for HP 8568/66 spec analyzers? I only have 3 of them between all the units I have, and only one of the ones that clamp the RF unit and the display unit together on the back. I'm happy to paypal a reasonable cost + shipping. Thanks!

What do they look like? Job for 3D printing maybe?

Here's an example. Those plastic things at each corner, and the ones in the middle screw together to secure the halves.

Im not too worried about these feet. On that SA they only come useful for lifting it occasionally since the feet are too short to actually set it down on them with the cables still plugged in. You don't want to bend those rare cables (They are almost worth more than the SA itself).

I do have a whole bag of spare HP feet for the bottom of the case tho. They come useful every so often.

[bd139]

Well this 465 is being a dick. The vertical is exactly half the height it should be. 

Bet there's a cracked resistor somewhere 

[Specmaster]

Or a duff bastard Tant?

[Brumby]

https://www.ebay.com/sch/i.html?_from=R40&_nkw=7442+ic&_sacat=0&LH_TitleDesc=0&_sop=15

Oh fuck... right, you're in oz. Not like it is over here, where 74xx are like potato chips: Plentiful, if a little greasy.

We've come full circle.  I remember getting my first rounds of 74xx ICs by mail order from the U.S.A.  Heaps cheaper than local.  I can still remember the bank cheques being made payable through The Chemical Bank New York, New York.  The 7400's I have here are from those days.  (Hope they still work.)

I think you should take bean up on his offer. I know it was genuine; just look at it as a chance to Pay It Froward.   

Of the chips of interest, Bean's image only showed 7404's.  They aren't the problem.  I can get one for $3.95 and a 45 minute road trip.  Other chips might be needed - and the only ones I have found in my stash are 7402's.

[bd139]

Or a duff bastard Tant?

Voltages all fine. Grr.

[mnementh]

I feel you. Have several "must-do" projects on at the same time right now; not a lot of time for the "fun". Even the PC modding thing... which is usually fun for me... is turning into a chore due to time pressure and the fact I need stuff off that PC.   

mnem
 

Not to mention the finicky fan that need to be taken care of if I managed to fix it  , thanks for your excellent details posts in the 2465B thread about that evil fan. 

Glad it helped! Anything to help my 2465 Army grow!  Muahahahahaha!!!

uncertainTEA will they be 10,000mAh as claimed  On a positive note taking a 1A charge without going kaboom 

Who said Aluminium held together with clamps was a bad conductor kwality job

10AH is about right for a D-size NiMH. No reason to believe they won't come up within 80% of that.

Propagation times are shit and the electrical interface is different if you stick an arduino in there. Be careful with timing sensitive circuits and things that expect TTL.

Already noted:

Yes, the propagation delay will be poor, but in some applications that won't matter at all - and in the ones that do matter, I'll just have to take that into account.  .....  Maybe use my stash of 7400's for input/output buffering.

Remember, this is only to aid troubleshooting.  No way I'd put something like this in as a permanent solution.  Yuck!

I understand that; which is why it's even MORE critical here. What you're suggesting here a is a "Void Comp" test; it ONLY helps you diagnose If it Works.

The purpose of substitution diag is to substitute a Known Good part and see how much further the signal gets before failing. Your Arduino isn't Known good; it's at best Maybe Good but might not work at all.

mnem
*Time to get ready for the dentist* 

[Specmaster]

Or a duff bastard Tant?

Voltages all fine. Grr.

Cracked resistor sounds about right then, still grr.

[bd139]

I’m doing a full vertical recalibration in case this is human error. As in the last human who I found bits of their scope tips inside it.

[Specmaster]

I’m doing a full vertical recalibration in case this is human error. As in the last human who I found bits of their scope tips inside it.

Human might be too kind, gorilla might be more like it 

specy: shopping beckons

[beanflying]

10AH is about right for a D-size NiMH. No reason to believe they won't come up within 80% of that.

mnem
*Time to get ready for the dentist* 

'Evilbay' 10,000 could be not quite honest  First charge peaked at 3000'ish this cycle is still going at 4500 as of 2am so if they behave like typical NiMh a few more cycles should get them closer to the claimed spec.

Must book another trip to my merchant of pain too

[mnementh]

(SNIP)
mnem
It's a sad day when I'm the voice of reason... 

ya know.....I can never remember if its mnem or nmem or or mnen.   BUT TVOR.....I can remember TVOR.

   Johnny mnemonic is my cousin.   TVOR is entirely too ironic; Murphy-tauntingly so.

I have the same problem, TVOR, I don't know that one but...PUFF I do know, Puff the magic Dragon.


Perhaps from this day forward mnem should be known as Puff 

Oh, for Ifni's sake no... especially not in context with the previous doobie discussion. 

ya know.....I can never remember if its mnem or nmem or or mnen.   BUT TVOR.....I can remember TVOR.

I have the same problem, TVOR, I don't know that one but...PUFF I do know, Puff the magic Dragon.
Perhaps from this day forward mnem should be known as Puff 

well you just called yourself "the voice of reason".  if the shoe fits.....

Hmm, no, that was mnem or puff

Fuck... too late. Now it's become a localized meme. 

mnemff
*Runs away and hides in the linen closet* 

[Specmaster]

Fuck... too late. Now it's become a localized meme. 

mnemff
*Runs away and hides in the linen closet* 

No no not the closet, dentist is waiting for you, remember? 

[mnementh]

As long as he's not waiting in the linen closet, i'm not seeing a downside here... 

mnem
*Off to meet my Doomtist*

[bitseeker]

uncertainTEA will they be 10,000mAh as claimed  On a positive note taking a 1A charge without going kaboom 

Who said Aluminium held together with clamps was a bad conductor kwality job

Wow, I haven't seen 10S quite like that before.

[bitseeker]

Clearly a TEA brother:

https://www.eevblog.com/forum/projects/your-stupidest-mistakes/msg1110679/#msg1110679

Yep, and probably all the ones who thanked the post, too. We are many!

[bitseeker]

Here's an example. Those plastic things at each corner, and the ones in the middle screw together to secure the halves.

Im not too worried about these feet. On that SA they only come useful for lifting it occasionally since the feet are too short to actually set it down on them with the cables still plugged in. You don't want to bend those rare cables (They are almost worth more than the SA itself).

I do have a whole bag of spare HP feet for the bottom of the case tho. They come useful every so often.

  Now we know where some of the HP feet have gone.

[bitseeker]

(SNIP)
mnem
It's a sad day when I'm the voice of reason... 

ya know.....I can never remember if its mnem or nmem or or mnen.   BUT TVOR.....I can remember TVOR.

   Johnny mnemonic is my cousin.   TVOR is entirely too ironic; Murphy-tauntingly so.

Oh, I thought maybe it was one of these m-n-em:

[Specmaster]

(SNIP)
mnem
It's a sad day when I'm the voice of reason... 

ya know.....I can never remember if its mnem or nmem or or mnen.   BUT TVOR.....I can remember TVOR.

   Johnny mnemonic is my cousin.   TVOR is entirely too ironic; Murphy-tauntingly so.

Oh, I thought maybe it was one of these m-n-em:

Very good [emoji1787]

[mnementh]

   Oh, I thought maybe it was one of these m-n-em:

I'm the purple m .

mnem
Fnord is the purple stripes in the road that never get painted.

[bd139]

Well bugger today. Outcome of fluffing around inside scopes = zero. Still the same number of broken scopes.  Anyone want to buy some broken scopes? I'm fed up of broken scopes now. 


Plus also this is a proper screwing and an example of why I don't buy anything from the US. This applies to test gear as well which is of interest to the group...

"made in USA" Elecraft K2 (zero rated for duty):

Direct conversion from USD to to GBP price ...... £620
After screwing by shipping, customs and UPS .... £866 (takes 7 days)
If I buy from euro official reseller ..................... £905 (takes 14 days)
If I get all the options I want ........................... £1333 (takes 7 days)

I did a finger in the air inventory cost for the whole thing in parts and boards cost from JLCPCB and Farnell here in UK.

£385 for all optioned parts delivered to my door tomorrow.

To build the entire receive chain only from scratch is around £55. Most of the fluff is the uC, hardware, boards, panels etc.

And that idea is going down the crapper