Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 2639531 times)

Specmaster, Cerebus, Cubdriver, Kosmic, kleiner Rainer, Ingeniq and 13 Guests are viewing this topic.

Offline bitseeker

  • Super Contributor
  • ***
  • Posts: 8326
  • Country: us
  • Lots of engineer-tweakable parts inside!
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47450 on: January 19, 2020, 06:24:39 pm »
better is to use a seperate filter bec. this all in one plugs are in front of the fuse, when they begin to burn like a RIFA you will have a lot of smoke on the bench.

Another argument for using filters that go after the switch is that the filter caps retain a charge for several seconds after the plug is pulled out (depending on exactly where in the mains cycle the break was made). This fact is known to many who've tried to re-route a mains cable behind a bunch of gear and stuck a finger into an IEC socket to figure out what orientation the plug needs to be. Ouch!

I resemble that remark. I haven't been bitten, yet. However, it does cross mind when I check orientation that way. ;D
I TEA.
 

Online Specmaster

  • Super Contributor
  • ***
  • Posts: 8657
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47451 on: January 19, 2020, 06:32:45 pm »
I do the same with the gear in my stack, and so far I have not been bitten yet, just don't say it too loud or else the equipment might hear and devise a plan to get me next time  :-DD
Who let Murphy in?
 

Online bd139

  • Super Contributor
  • ***
  • Posts: 13781
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47452 on: January 19, 2020, 07:15:43 pm »
If anyone in U.K. wants some easy money hit this: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F293432894672

Heathkit CR bridge with magic eye. Go for £100+ usually including bust ones because it has leakage test for capacitors.

I was going to grab it but honestly I can’t be arsed to deal with tube stuff now.
 

Online tautech

  • Super Contributor
  • ***
  • Posts: 17546
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
« Last Edit: January 20, 2020, 12:21:05 am by tautech »
Avid Rabid Hobbyist
 

Online Specmaster

  • Super Contributor
  • ***
  • Posts: 8657
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47454 on: January 19, 2020, 07:21:14 pm »
If anyone in U.K. wants some easy money hit this: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F293432894672

Heathkit CR bridge with magic eye. Go for £100+ usually including bust ones because it has leakage test for capacitors.

I was going to grab it but honestly I can’t be arsed to deal with tube stuff now.
To late, I've just grabbed it. Thanks bd139  :-+
Who let Murphy in?
 

Offline worsthorse

  • Super Contributor
  • ***
  • Posts: 1082
  • Country: us
  • aina varma, usein väärin
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47455 on: January 19, 2020, 07:34:04 pm »
I can't speak for the newer Metcals like BD139's, but the older SP200 and MX-5 have the switch after the transformer, so the transformer primary is always live whenever the thing's plugged in.

The Tek 2901 is like that; the OCXO's oven is permanenly powered when plugged in.



So is the 184...
specialization is for insects.
 

Online bd139

  • Super Contributor
  • ***
  • Posts: 13781
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47456 on: January 19, 2020, 07:36:12 pm »
If anyone in U.K. wants some easy money hit this: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F293432894672

Heathkit CR bridge with magic eye. Go for £100+ usually including bust ones because it has leakage test for capacitors.

I was going to grab it but honestly I can’t be arsed to deal with tube stuff now.
To late, I've just grabbed it. Thanks bd139  :-+

 :-+  We expect pictures  :-DD
 

Offline worsthorse

  • Super Contributor
  • ***
  • Posts: 1082
  • Country: us
  • aina varma, usein väärin
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47457 on: January 19, 2020, 07:41:23 pm »
I know, I know, I said I was going to take a break from fixing/refurbing and build a couple of kits. Then I walked into the TE storage vault (aka the furnace room) and saw the stack of TM500 plugins waiting to be worked on.  I decided maybe I should take on something that I understand for a change, so I pulled out these:



Three DM502s, one with the temperature option.  Seems like every time I bought a batch of TM plugins, there was a DMM in the pile. (I also have a couple of DM502As)  Anyway, I am going to put these through a check out and burn in procedure. Naturally the one I am most interested in - the one with the temp probe option - is in the worst condition. 

They all power up and there's no obvious component damage, but their state of usability is unknown. The plan is to test them, fix the busted bits, clean them up and try to sell all but one.
specialization is for insects.
 

Online xrunner

  • Super Contributor
  • ***
  • Posts: 4626
  • Country: us
  • hp>Agilent>Keysight>?
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47458 on: January 19, 2020, 07:49:42 pm »
I know, I know, I said I was going to take a break from fixing/refurbing and build a couple of kits. Then I walked into the TE storage vault (aka the furnace room) and saw the stack of TM500 plugins waiting to be worked on.  I decided maybe I should take on something that I understand for a change, so I pulled out these:

Oh yea - I got one of those, I think everybody has at least one.  :-DD
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 

Offline mnementh

  • Super Contributor
  • ***
  • Posts: 6455
  • Country: ca
  • *Escaping The Suck*
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47459 on: January 19, 2020, 08:03:49 pm »
I know, I know, I said I was going to take a break from fixing/refurbing and build a couple of kits. Then I walked into the TE storage vault (aka the furnace room) and saw the stack of TM500 plugins waiting to be worked on.  I decided maybe I should take on something that I understand for a change, so I pulled out these:

(Attachment Link)

Three DM502s, one with the temperature option.  Seems like every time I bought a batch of TM plugins, there was a DMM in the pile. (I also have a couple of DM502As)  Anyway, I am going to put these through a check out and burn in procedure. Naturally the one I am most interested in - the one with the temp probe option - is in the worst condition. 

They all power up and there's no obvious component damage, but their state of usability is unknown. The plan is to test them, fix the busted bits, clean them up and try to sell all but one.

I hate to be that guy, but I suspect they'd bring more just for the knobs & binding posts. *cringe*

mnem
*Currently praying to the God of Toasters*
 

Online bd139

  • Super Contributor
  • ***
  • Posts: 13781
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47460 on: January 19, 2020, 08:18:11 pm »
Can confirm. I made a fair bit of cash more than the scope's value out of breaking my parts mule 465  :-DD
 

Online Specmaster

  • Super Contributor
  • ***
  • Posts: 8657
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47461 on: January 19, 2020, 09:25:55 pm »
If anyone in U.K. wants some easy money hit this: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F293432894672

Heathkit CR bridge with magic eye. Go for £100+ usually including bust ones because it has leakage test for capacitors.

I was going to grab it but honestly I can’t be arsed to deal with tube stuff now.
To late, I've just grabbed it. Thanks bd139  :-+

 :-+  We expect pictures  :-DD
And you'll get them, it looks to be in reasonable shape as well. I can be used with modern capacitors as well, it's not restricted valve gear.
Who let Murphy in?
 

Offline mnementh

  • Super Contributor
  • ***
  • Posts: 6455
  • Country: ca
  • *Escaping The Suck*
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47462 on: January 19, 2020, 10:20:54 pm »
Can you actually turn the voltage down low enough on the leakage test for the low-voltage caps typically found outside a SMPS nowadays? The ranges on that function are typically very coarse... like "High Voltage" & "Higher Voltage" and that's it... LOL :-DD

In Other News...

Welp... after praying to the God Goddess of Toasters, I have emerged victorious with a functional bagel-scorching unit once more. The scene was not quite as horrific as #dragonsfuckingcars but it came close; the post-mortem revealed a long coil spring that had escaped from a slider shaft and coiled up directly under a PCB with 120VAC on it.  :scared:

Amazingly, nobody was electrocuted nor was there fire; after repairing the errant spring (and reinforcing the retainer mechanism on the slider shaft to prevent future recidivism) I was pleasantly surprised to find the timer circuit still worked!

I am now toasting up a whole loaf of pumpernickel bread to celebrate.  >:D

mnem
I was really getting tired of sooty claws from toasting it dwagon-style... makes everything you eat afterwards taste like old cold BBQ... :P
« Last Edit: January 20, 2020, 03:07:38 am by mnementh »
 

Online bd139

  • Super Contributor
  • ***
  • Posts: 13781
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47463 on: January 19, 2020, 10:23:22 pm »
Damn and I'd just got dragons fucking cars out of my head. Aaaand clopping came back too for some reason at the same time :( :palm: :-DD
 
The following users thanked this post: mnementh

Online Specmaster

  • Super Contributor
  • ***
  • Posts: 8657
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47464 on: January 19, 2020, 10:41:26 pm »
Thats a real nasty vision that  :-DD

@mnem, well I do have some high voltage caps that can be tested with it, I can also become another bd139 on the low voltage ones and blow the shit out them  >:D

I've downloaded the manual and it says I can go as low as 25V so it will do some modern day low voltages but nothing lower than 25V. But its main purpose was to clean it up, repair if required and flip it on again to fund further more modern TEA purchases  :-+
Who let Murphy in?
 
The following users thanked this post: mnementh

Online med6753

  • Super Contributor
  • ***
  • Posts: 5443
  • Country: us
  • Tek nut
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47465 on: January 19, 2020, 10:57:29 pm »
Started final set up of the 535A/CA plug-in. First items to check are vertical gain and time base accuracy.


Using the FeelTech FY2200SP Function Generator as signal source. Square Wave 0.5V p-p @ 50Khz. Insurance that it's output is correct via the Siglent SDS 1052DL DSO. The Siglent has original and unmolested factory cal and also has a factory cal sheet.



Channel A of the CA plug-in. Set to 0.1V/Div and mainframe set to Time Base A sweep speed of 5us/cm. 5 major divisions deflection. Dead nuts. No adjustment required. Channel B of the CA plug-in was the same.



Next is the sweep cal. Time Base A set to 10us. It's off. A time mark generator would be best here but I don't have one so I'll have to use the square wave.



Fluke 1900A connected to the Vertical Signal Out of the 535A to make sure it hasn't drifted.



Sweep cal adjusted. Now perfect. Checked Time Base B and it's OK. Also checked various other frequencies and it tracks properly.



Follow on is to check the compensation of the CA plug-in then perform some frequency response checks. That will be a follow on post. Once that's done this project is a wrap. 
An old gray beard with an attitude.
 
The following users thanked this post: BU508A, bd139, Kosmic

Online Specmaster

  • Super Contributor
  • ***
  • Posts: 8657
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47466 on: January 19, 2020, 11:04:22 pm »
Sweep cal adjusted. Now perfect. Checked Time Base B and it's OK. Also checked various other frequencies and it tracks properly.



Follow on is to check the compensation of the CA plug-in then perform some frequency response checks. That will be a follow on post. Once that's done this project is a wrap. 
Looking at the photo, I would say that it is slightly off still, more work required to be nuts.  >:D
Who let Murphy in?
 

Online med6753

  • Super Contributor
  • ***
  • Posts: 5443
  • Country: us
  • Tek nut
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47467 on: January 19, 2020, 11:15:26 pm »
Sweep cal adjusted. Now perfect. Checked Time Base B and it's OK. Also checked various other frequencies and it tracks properly.



Follow on is to check the compensation of the CA plug-in then perform some frequency response checks. That will be a follow on post. Once that's done this project is a wrap. 
Looking at the photo, I would say that it is slightly off still, more work required to be nuts.  >:D

Nope, per the manual the far left and far right of the trace are NOT considered within the cal points. And you are getting some parallax errors in the photo too.     
An old gray beard with an attitude.
 

Online med6753

  • Super Contributor
  • ***
  • Posts: 5443
  • Country: us
  • Tek nut
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47468 on: January 19, 2020, 11:30:59 pm »
Here's another view. Same 50Khz square wave with Time Base A set to 5us. Perfectly aligned.


An old gray beard with an attitude.
 

Online Specmaster

  • Super Contributor
  • ***
  • Posts: 8657
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47469 on: January 19, 2020, 11:43:10 pm »
I've always gone for the best overall fit between central 8 columns because of the possible distortion on the outer 2 columns, I've ignored those 2, and I've always been able to get them dead nuts on those 8 with relative ease.
Who let Murphy in?
 

Offline worsthorse

  • Super Contributor
  • ***
  • Posts: 1082
  • Country: us
  • aina varma, usein väärin
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47470 on: January 20, 2020, 12:56:49 am »
I know, I know, I said I was going to take a break from fixing/refurbing and build a couple of kits. Then I walked into the TE storage vault (aka the furnace room) and saw the stack of TM500 plugins waiting to be worked on.  I decided maybe I should take on something that I understand for a change, so I pulled out these:

(Attachment Link)

Three DM502s, one with the temperature option.  Seems like every time I bought a batch of TM plugins, there was a DMM in the pile. (I also have a couple of DM502As)  Anyway, I am going to put these through a check out and burn in procedure. Naturally the one I am most interested in - the one with the temp probe option - is in the worst condition. 

They all power up and there's no obvious component damage, but their state of usability is unknown. The plan is to test them, fix the busted bits, clean them up and try to sell all but one.

I hate to be that guy, but I suspect they'd bring more just for the knobs & binding posts. *cringe*

mnem
*Currently praying to the God of Toasters*

Yeah, you are right but I can't be bothered breaking shit down and selling the bits one post office trip at a time.  And once I get something working (or destroy it, as I did the 184  :palm:) unless I really want it for my bench, I don't keep stuff around for too long.

While I go through periods of binge purchasing (the save the stuff from the dumpster phase a year back comes to mind) I am really not much of a collector.  I know... heresy

 :-DD
specialization is for insects.
 

Offline worsthorse

  • Super Contributor
  • ***
  • Posts: 1082
  • Country: us
  • aina varma, usein väärin
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47471 on: January 20, 2020, 12:58:02 am »
Here's another view. Same 50Khz square wave with Time Base A set to 5us. Perfectly aligned.

photo goes here

Nice piece of work med!
specialization is for insects.
 
The following users thanked this post: med6753

Online Specmaster

  • Super Contributor
  • ***
  • Posts: 8657
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47472 on: January 20, 2020, 01:29:32 am »
@menm Studying the photo it looks like there is a 5V setting on the output and I have found a dedicated C-3U service manual, the U standing for the UK model and it has the following DC ranges so is pretty good for modern low voltage capacitors as well, 5V, 25V, 150V, 250V and 450V. So hopefully when it arrives it will be after replacing the selenium diode with a IN4007 and a suitable dropper resistor winner winner, chicken dinner  :-+


Edit, found a better photo on the eBay listing and is attached
« Last Edit: January 20, 2020, 01:37:35 am by Specmaster »
Who let Murphy in?
 
The following users thanked this post: mnementh

Offline mnementh

  • Super Contributor
  • ***
  • Posts: 6455
  • Country: ca
  • *Escaping The Suck*
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47473 on: January 20, 2020, 01:34:40 am »
Hallmark moment: Taking care of my Sick son. Pump him full of cold medicine, let him watch Austin Powers and giggle.  :-DD

mnem
*couch-tuber-time widda son*
 

Online Specmaster

  • Super Contributor
  • ***
  • Posts: 8657
  • Country: gb
Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47474 on: January 20, 2020, 01:36:14 am »
Hallmark moment: Taking care of my Sick son. Pump him full of cold medicine, let him watch Austin Powers and giggle.  :-DD

mnem
*couch-tuber-time widda son*
Great films, which one is that you're watching?
Who let Murphy in?
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf