Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 1824547 times)

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Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30100 on: April 25, 2019, 01:49:04 am »
"you've got to have three before you have four"

I wonder what my fourth scope is going to be...

If I include a B&K scope, RCA scope, and Siglent DSO but exclude the 3 parts mules it totals 10. Am I done? No. Do I have enough? No.  :-DD But I will be more selective in what I go after.

Enough? No. You don't have 20 oscilloscopes, yet. :popcorn:
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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30101 on: April 25, 2019, 02:41:22 am »
Current:

1) 2465 Works 100%; I've had since it was new. Taken as "Spoils of War" from successful product "campaign".  :-+
1) 2465 (escaped from NASA) bought as a parts machine, but repaired 100%. (Now down with bad PSU)   :--
1) 2465 bought as a parts machine. Still a few usable parts left.   :--
1) 2230 bought DOA, repaired 100% & used for a decade, still works but with errors in POST. :-- / :-+
1) 1054Z bought new; Father's Day gift from "The Enabler", aka my wife. Cracked, working 100%.  :-+
1) Clone SALAE Scope/16CH LA  bought new, fully functional but pirated software requires 32-bit OS so PITA to use.  :-+

Not going to even begin to list meters though.  :palm:

mnem
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« Last Edit: April 25, 2019, 02:55:56 am by mnementh »
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30102 on: April 25, 2019, 02:52:06 am »
It is a Tek device without a part number. A very well made adjustable RC filter, with a corner frequency between 40 and 200 MHz, though the response is pretty awful above 100 MHz.  It was in a box with a bunch of calibration fixtures, so I am guessing it is that sort of device, but what the hell do you use it for?  [head scratching gif goes here]
   My guess would be a scope normaliser (can have several different names). The schematic of one for a scope with a 20pF input is shown below, and I'm sure you can find the manual!

That's a reasonable guess. I have a couple of the "RC normalizer" modules in the pile. Will treat it as such unless I find a better answer. Off to look at photos on the tek wiki to see if I can find a part number.

https://www.antiqueradios.com/forums/viewtopic.php?p=1118445

For those wondering. Looks like the combination of 1meg resistor vs fixed cap will give you a rough indication of the intended matching input.

The one shown above may also be usable for bitseeker's new baby to get more modern probes to play nice with the 454's 20pF inputs, at least at lower frequencies.  :-+

mnem
mrrp?
« Last Edit: April 25, 2019, 02:54:05 am by mnementh »
 
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Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30103 on: April 25, 2019, 03:01:17 am »
Not going to even begin to list meters though.  :palm:

Likewise! :palm:
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Offline wch

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30104 on: April 25, 2019, 03:08:40 am »
hmmm... it appears that I have more oscilloscopes than I remembered    ::)

   475A - works, needs a complete refurb, hamfest find, first bench scope
   465 - no display, probably PS caps, don't remember where it came from
   466 - no display, probably PS caps, received from a neighbor
   468 - left for dead in a trash bin, parts mule
   531 - saved from being scraped, works, as old as I am, on the shelf
   2215 - works, on the shelf
   2216 - saved from trash bin, missing attenuator, parts mule
   2465 - current bench scope, needs a complete going over
   TDS420A - works, not sure what I am going to with it, on the shelf

And a DS1054, a birthday gift from my wife, also on my bench. 

The first on the list is the 475A but I have to finish rehabbing the stack of TM500 plugins first. Got another one calibrated today then found that the offset pot was fubar.  |O  So find a replacement and run through the calibration again.
« Last Edit: April 25, 2019, 04:21:50 am by wch »
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Offline wch

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30105 on: April 25, 2019, 03:13:44 am »
It is a Tek device without a part number. A very well made adjustable RC filter, with a corner frequency between 40 and 200 MHz, though the response is pretty awful above 100 MHz.  It was in a box with a bunch of calibration fixtures, so I am guessing it is that sort of device, but what the hell do you use it for?  [head scratching gif goes here]
   My guess would be a scope normaliser (can have several different names). The schematic of one for a scope with a 20pF input is shown below, and I'm sure you can find the manual!

That's a reasonable guess. I have a couple of the "RC normalizer" modules in the pile. Will treat it as such unless I find a better answer. Off to look at photos on the tek wiki to see if I can find a part number.

https://www.antiqueradios.com/forums/viewtopic.php?p=1118445

For those wondering. Looks like the combination of 1meg resistor vs fixed cap will give you a rough indication of the intended matching input.

The one shown above may also be usable for bitseeker's new baby to get more modern probes to play nice with the 454's 20pF inputs, at least at lower frequencies.  :-+

mnem
mrrp?

I need to remember that board when I am working on this older gear. There is a lot of good info there. I would guess that the device I posted is a normalizer but the input resistor value is too low. Or I am a goofball and misread it, which is more likely.  |O  I will check in the morning.  Thanks for the assist.
specialization is for insects.
 

Offline 0culus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30106 on: April 25, 2019, 03:39:18 am »
https://youtu.be/1wwZ8eI3jvw?t=236

Now I have a good excuse to never clean my bench...  :-DD
Haha, I'm with you on that one.

Sorry, he was a smart individual and will be sorely missed but I just can't work with a messy bench like that.

I gather from reading about him that he purposely left his work lab messy to deter other engineers from "borrowing" his stuff. His home lab, on the other hand, was kept much neater: https://readingjimwilliams.blogspot.com/2011/11/book-2-chapter-17.html
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30107 on: April 25, 2019, 06:13:50 am »
Not going to even begin to list meters though.  :palm:

Likewise! :palm:
Oh, go on list your meters, that’s my weak spot. I have far more meters than I actually need, then hear Dave Jones voice whispering in my, “You can never have too many meters” so I get another and another and so it goes on. I think I need to let some go, no more space.☹️
Who let Murphy in?
 

Offline PrecisionAnalytic

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30108 on: April 25, 2019, 06:24:39 am »
I'm behind on reading blogs at the moment.

The Tekwiki for the Pacific Measurements 1038 system is moving forward at full blast.   :box:

I figured I'd promote for membership (enjoy yourself... I'm not nit picky) and have a central source for resources, experiences, history or whatever insight they'd like to share regarding Pacific Measurements and Wavetek Systems.  Thanks in advance for your time and support!   :-+

https://www.facebook.com/groups/698747963909529/?hc_location=group
 
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Offline tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30109 on: April 25, 2019, 06:49:44 am »
I'm behind on reading blogs at the moment.

The Tekwiki for the Pacific Measurements 1038 system is moving forward at full blast.   :box:

I figured I'd promote for membership (enjoy yourself... I'm not nit picky) and have a central source for resources, experiences, history or whatever insight they'd like to share regarding Pacific Measurements and Wavetek Systems.  Thanks in advance for your time and support!   :-+

https://www.facebook.com/groups/698747963909529/?hc_location=group

That requires me to log in to farcebook (or less polite names), so sorry, that's of no use to me.
There are lies, damned lies, statistics - and ADC/DAC specs.
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30110 on: April 25, 2019, 07:38:24 am »
Same here. Facebook is not public access.
 

Online BravoV

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30111 on: April 25, 2019, 07:51:22 am »
+1 , I don't like to lie on FB registration details, but I also despise that my true personal credential in the hand of Facebook, hence no.

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30112 on: April 25, 2019, 08:05:31 am »
This 465B parts unit came with this dark X-ray bezel similar to what Beanflying has on the 453. Turns out this is “Option 4 EMC Environmental” which includes this mesh filter plus and EMI filter on the mains input. This is a pix of the backside showing all the perimeter contacts to insure good shielding to the chassis. Just for giggles I installed it on one of the working 465B's and surprisingly it doesn't reduce trace intensity all that much. I thought it was going to be much worse.

And yes, it really is that filthy and it won't come clean. Don't know why.    :-//

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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30113 on: April 25, 2019, 08:40:29 am »
Interesting. Not seen one of them yet.
 

Online tautech

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30114 on: April 25, 2019, 09:10:29 am »
@ med
Can you get Simple Green, that stuff can work miracles on some mucks.
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30115 on: April 25, 2019, 09:16:23 am »
Well it appears that the DM44 on my 475A has some serious problems. The timebase readout makes no sense at all and the ohms range doesn’t work. I am thinking of removing it from the 475A as I don’t need it and putting the 465 case on the unit. I can also squeeze it on my shelf then as the DM44 is too high.
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30116 on: April 25, 2019, 09:23:58 am »
What is it with DMM's today then, I've just discovered that the Current range on the 8840A has gone OC and its not the fuse, just about to open it up and investigate  :palm:

EDIT:
Loose connection on the back of the fuse holder  |O
« Last Edit: April 25, 2019, 10:53:35 am by Specmaster »
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Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30117 on: April 25, 2019, 09:46:32 am »
@ med
Can you get Simple Green, that stuff can work miracles on some mucks.

I have/use Simple Green all the time. Great stuff.  :-+ But I didn't try it here. Used an ammonia based window cleaner.
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Online tautech

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30118 on: April 25, 2019, 09:51:37 am »
@ med
Can you get Simple Green, that stuff can work miracles on some mucks.

I have/use Simple Green all the time. Great stuff.  :-+ But I didn't try it here. Used an ammonia based window cleaner.
Do you think someone has used a solvent on that screen ? Is it smooooth as babies bum or roughened like partially melted by a solvent ?
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Online beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30119 on: April 25, 2019, 10:01:17 am »
@ med
Can you get Simple Green, that stuff can work miracles on some mucks.

I have/use Simple Green all the time. Great stuff.  :-+ But I didn't try it here. Used an ammonia based window cleaner.
Do you think someone has used a solvent on that screen ? Is it smooooth as babies bum or roughened like partially melted by a solvent ?

I hit mine with the vacuum and brush then gave it a soft brush scrub with IPA. Given the vintage of mine it is almost certainly wire. Still not using it as the Graticule's  were a PITA to see.

Currently PC tethered to phone as the Internerd is  :rant: again tonight.
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Online tautech

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30120 on: April 25, 2019, 10:04:11 am »
@ med
Can you get Simple Green, that stuff can work miracles on some mucks.

I have/use Simple Green all the time. Great stuff.  :-+ But I didn't try it here. Used an ammonia based window cleaner.
Do you think someone has used a solvent on that screen ? Is it smooooth as babies bum or roughened like partially melted by a solvent ?

I hit mine with the vacuum and brush then gave it a soft brush scrub with IPA. Given the vintage of mine it is almost certainly wire. Still not using it as the Graticule's  were a PITA to see.

Currently PC tethered to phone as the Internerd is  :rant: again tonight.
Was yours as grubby as meds ?
His is downright yuck !
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Online beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30121 on: April 25, 2019, 10:27:51 am »
Most of the grot on mine would have come from the disintegrated foam inside the front cover where the probes sit behind the door. As the rest of the unit was clean inside it seems to have lived in a good home.
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Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30122 on: April 25, 2019, 11:27:35 am »
@ med
Can you get Simple Green, that stuff can work miracles on some mucks.

I have/use Simple Green all the time. Great stuff.  :-+ But I didn't try it here. Used an ammonia based window cleaner.
Do you think someone has used a solvent on that screen ? Is it smooooth as babies bum or roughened like partially melted by a solvent ?

It's surface is rough so that's a good possibility. I'm not going to be using it anyway and I installed it back on the parts mule. I was just curious to see how much it darkened the trace.
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Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30123 on: April 25, 2019, 11:32:11 am »
Well it appears that the DM44 on my 475A has some serious problems. The timebase readout makes no sense at all and the ohms range doesn’t work. I am thinking of removing it from the 475A as I don’t need it and putting the 465 case on the unit. I can also squeeze it on my shelf then as the DM44 is too high.

I have a spare DM44 that as far as I know works fine except has a cracked bezel on the right side. But that's easy to swap over with yours. You can have it for the cost of shipping across the pond if you want it. Let me know.  :-+
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #30124 on: April 25, 2019, 12:39:30 pm »
Thanks for the offer. Much appreciated. Will see how this goes first  :-+
 


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