Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 819177 times)

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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3025 on: October 21, 2017, 10:19:27 am »
Bad timing fail for me in that department. My HP supply is due to arrive on Monday. She’s out tomorrow and in all day on Monday and I’m out.
 

Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3026 on: October 21, 2017, 10:38:48 am »
Bad timing fail for me in that department. My HP supply is due to arrive on Monday. She’s out tomorrow and in all day on Monday and I’m out.


Ahhh, this is just like "reality" TV (which I don't watch, since I remember "The Year of the Sex Olympics").
There are lies, damned lies, statistics - and ADC/DAC specs.
Gliding aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
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Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3027 on: October 21, 2017, 10:44:06 am »
Bad timing fail for me in that department. My HP supply is due to arrive on Monday. She’s out tomorrow and in all day on Monday and I’m out.


Ahhh, this is just like "reality" TV (which I don't watch, since I remember "The Year of the Sex Olympics").
If you dont watch it, how do you know its like it?  :popcorn:
Who let Murphy in?
 

Offline WastelandTek

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3028 on: October 21, 2017, 11:30:12 am »
WastelandTek, it's helpful to add your country in your profile so folks have a sense for things such as, in this case, potential shipping costs when they see your country's flag in your posts.

Those two units look to be in great condition and would work nicely for audio. The 353A patch panel is often found in a three-instrument enclosure between a 200-series oscillator and 400-series AC voltmeter.

sorry, West coast USA
I'm new here, but I tend to be pretty gregarious, so if I'm out of my lane please call me out.
 

Offline URI

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3029 on: October 21, 2017, 11:40:54 am »
Bad timing fail for me in that department. My HP supply is due to arrive on Monday. She’s out tomorrow and in all day on Monday and I’m out.

Reality sometimes strikes without mercy.  >:D
But you have to justify only for one package, lucky man..  :-DD
A life without TEA is possible but pointless.
 

Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3030 on: October 21, 2017, 01:22:15 pm »
WastelandTek, it's helpful to add your country in your profile so folks have a sense for things such as, in this case, potential shipping costs when they see your country's flag in your posts.

sorry, West coast USA

Cool. Normally, stuff for sale would go into the Buy & Sell forum, but we're pretty flexible in the TEA house. So, add to your original post how much you're looking to get for them, even if it's just the cost of postage (i.e., just get it off my bench!), and people can PM you to make arrangements.
You don't acquire TEA. It acquires you.
 

Online mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3031 on: October 21, 2017, 01:55:16 pm »
Awww jeez, guys... now you got me thinking about digging out the Heathkit IM-1202 and Wavetek SAM Jr that have been lost in some unknown box somewhere in the house since we moved 2 years ago...

Damn you. Damn you to hell.


mnem
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Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3032 on: October 21, 2017, 02:02:54 pm »
No wife. Girlfriend doesn't live with me. I can get as many packages delivered as I want, when I want. I answer to no one. In fact, my bench is in the living room. Not stuffed away in a closet. Life is good!  :-+

But I've been there in past and totally understand.   
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Offline WastelandTek

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3033 on: October 21, 2017, 02:41:32 pm »
No wife. Girlfriend doesn't live with me. I can get as many packages delivered as I want, when I want. I answer to no one. In fact, my bench is in the living room. Not stuffed away in a closet. Life is good!  :-+

But I've been there in past and totally understand.

GF does live here, but she is a real sport.  Lab is just off the front room...front room that permanently houses rock and roll band.  ;D Life is indeed good.    :-+  :-+
I'm new here, but I tend to be pretty gregarious, so if I'm out of my lane please call me out.
 

Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3034 on: October 21, 2017, 04:01:47 pm »
I don't know if this YouTuber is on the forum, but the beginning of these videos (five months apart, even) sure sounds like he should be in this thread, no?





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Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3035 on: October 21, 2017, 05:18:03 pm »
Keithley and/or Triax experts: A few months ago, I got a Keithley 220 which supposedly had a problem. Upon receipt, it would throw an error anytime I enabled the output, regardless how high or low I set the current and compliance voltage.

The problem turned out to be the 2-lug Triax-to-BNC adapter that someone had installed on the output connector. Removing it enabled the supply to operate just fine. On the 220, the center pin is output HI, inner shield is output LO, and outer shield is chassis common.

Other adapters I've seen send the center pin through and tie either the inner (LO) or outer (common) — but not both — to the BNC shield. This adapter sends the center pin through, ties the inner (LO) to the BNC shield, but then has approximately 6.5 MOhms between the inner (LO) and outer (common). What's up with that?

There's also a warning label on the adapter to limit the voltage between LO and common to 30V (~4.6 µA between them). Is this an arrangement that anyone recognizes?
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Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3036 on: October 21, 2017, 07:37:09 pm »
Bad timing fail for me in that department. My HP supply is due to arrive on Monday. She’s out tomorrow and in all day on Monday and I’m out.


Ahhh, this is just like "reality" TV (which I don't watch, since I remember "The Year of the Sex Olympics").
If you dont watch it, how do you know its like it?  :popcorn:

You accidentally see snippets while channel surfing. You hear other people droning on about it. Those shows have good PR conslutants (sic).

But this is too far from TEA to be interesting.
There are lies, damned lies, statistics - and ADC/DAC specs.
Gliding aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
Having fun doing more, with less
 

Online Berni

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3037 on: October 21, 2017, 10:37:18 pm »
Keithley and/or Triax experts: A few months ago, I got a Keithley 220 which supposedly had a problem. Upon receipt, it would throw an error anytime I enabled the output, regardless how high or low I set the current and compliance voltage.

The problem turned out to be the 2-lug Triax-to-BNC adapter that someone had installed on the output connector. Removing it enabled the supply to operate just fine. On the 220, the center pin is output HI, inner shield is output LO, and outer shield is chassis common.

Other adapters I've seen send the center pin through and tie either the inner (LO) or outer (common) — but not both — to the BNC shield. This adapter sends the center pin through, ties the inner (LO) to the BNC shield, but then has approximately 6.5 MOhms between the inner (LO) and outer (common). What's up with that?

There's also a warning label on the adapter to limit the voltage between LO and common to 30V (~4.6 µA between them). Is this an arrangement that anyone recognizes?

Well triax is always a headache. There are also various types of triax and BNC adapters with different wiring inside.

On my Keithley electrometer (Also has the rare 2 lug triax) the outer shield is just earth and is not used for anythyng other than sheilding so in a BNC adapter you would want the inner shield to the the shield of the BNC while leaving the outer shield unconnected.

Then there is my Agilent SMU that also has triax connectors on it but with a different pinout. There center conductor is sense, inner shield is force and outer shield is guard. To convert this to BNC you would need to short the center and inner shield together while sending the outer shield to the BNC shield. If the two are not connected then the SMU can't output any current. And yes having the guard be the outer shield means you can grab on to 100V on the metal connector case, for this reason there is a plastic cover over the triax jacks.
 

Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3038 on: October 21, 2017, 11:29:22 pm »
Bad timing fail for me in that department. My HP supply is due to arrive on Monday. She’s out tomorrow and in all day on Monday and I’m out.


Ahhh, this is just like "reality" TV (which I don't watch, since I remember "The Year of the Sex Olympics").
If you dont watch it, how do you know its like it?  :popcorn:

You accidentally see snippets while channel surfing. You hear other people droning on about it. Those shows have good PR conslutants (sic).

But this is too far from TEA to be interesting.
I agree TEA is far more interesting, I hardly watch any TV these day, and when I use the TV, I go on YouTube and put on Electronics tear downs and blogs far more entertaining and educational as well to boot 
« Last Edit: October 22, 2017, 06:11:20 am by Specmaster »
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3039 on: October 22, 2017, 05:12:59 am »
Haven’t watched TV for about ten years. Would rather be creating or fixing something or whacking F5 on the ten eBay tabs I have open  :-DD
 

Offline THDplusN_bad

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3040 on: October 22, 2017, 06:20:51 am »
No wife. Girlfriend doesn't live with me. I can get as many packages delivered as I want, when I want. I answer to no one. In fact, my bench is in the living room. Not stuffed away in a closet. Life is good!  :-+

But I've been there in past and totally understand.

I am blessed with a very understanding spouse, but why is my face showing up a bit envy-green in the mirror right now?  :-DD
 

Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3041 on: October 22, 2017, 06:24:02 am »
Well triax is always a headache. There are also various types of triax and BNC adapters with different wiring inside.

On my Keithley electrometer (Also has the rare 2 lug triax) the outer shield is just earth and is not used for anythyng other than sheilding so in a BNC adapter you would want the inner shield to the the shield of the BNC while leaving the outer shield unconnected.

Thanks for the info, Berni. Same arrangement with the Keithley 220. When I first checked the adapter for continuity, it seemed to be correct, yet the 220 still threw an error. Then, I measured the resistance between the conductors and discovered the built-in "terminator."

It's good that the adapter was the source of the problem, but a bummer that I now have to find a 2-lug triax cable. It's never ending. :horse: :-DD
You don't acquire TEA. It acquires you.
 

Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3042 on: October 22, 2017, 06:26:40 am »
I agree TEA is far more interesting, I hardly watch any TV these day, and when I use the TV, I go on YouTube and put on Electronics tear downs and blogs far more entertaining and educational as well to boot

Hanging out with y'all, fixing stuff, and watching electronics videos is so much better than TV. :-+ :-+
You don't acquire TEA. It acquires you.
 

Offline neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3043 on: October 22, 2017, 07:15:50 am »
Do you believe in santa? I may have to reconsider my stance, killer deal, delivered a day early, and last callibrated in '96.  :-DD

The packaging was well worth the 80 bucks shipping, wrapped in 3 inches of bubble wrap with another 3 inches of polyethylene foam sheet on every side.

All 4 channels in working order, all accurate to each other, and excluding the 2nd 200MHz channel free of bugs. The only glitch on the 200MHz channel 2 is that it constantly says "IDENTIFY" and has its volts/div know missing with the push in/out out vernier broken off.
7A26   calibrated 06/12/96 by STK
7A18   calibrated 07/27/95 by Instrument Repair Labs.
7B85   calibrated 10/24/96 by STK
7B53   calibrated 07/27/95 by Instrument Repair Labs.
7704A calibrated 04/14/96 by STK

The test is a bit of a quick test, same signal going to all channels. I have it sitting on an old typewriter table i bought for 10 bucks, not a perfect fit but it is pretty close.

Excuse the red, it is just what my camera does if you turn off the flash.
« Last Edit: October 22, 2017, 07:19:00 am by neo »
A hopeless addict (and slave) to TEA and a firm believer that high frequency is little more than modern hoodoo.
 

Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3044 on: October 22, 2017, 07:17:51 am »
I think you won. Nice one  :-+
 
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Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3045 on: October 22, 2017, 07:23:51 am »
Very nice, but why is the top trace inverted?
Who let Murphy in?
 

Offline neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3046 on: October 22, 2017, 07:34:38 am »
Because i had the switch to invert it switched by accident and didn't see a need to re-take the picture.
« Last Edit: October 22, 2017, 07:39:31 am by neo »
A hopeless addict (and slave) to TEA and a firm believer that high frequency is little more than modern hoodoo.
 

Offline URI

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3047 on: October 22, 2017, 07:48:46 am »
The HP 3335A was delivered today.  :)
BTW: We were having breakfast when the DHL-man rang. I knew it was DHL because I had seen the van in our street short time before.
I told my wife she should't care and went to the door, received three packets, put them in the room next to the front door and returned to the kitchen. I mentioned it was DHL, nothing special.  ;D
I received them so SECRETly, I'm happy!  :-DD

My wife left the flat at ~15 o'clock (3 PM.. ;)) for several hours and that put me to life. Went straight to open the packages and have little christmas!

First packet brought me a PCB holder. Handy, espacially, when only one arm is fully usable. ;)
The second packet held the desoldering station. Yummie!
The third packet that I couldn't barely handle with 1 and 1/8 usable arms had the HP3335A in it, sold for parts.

Quick testing of it showed that the internal OCXO ist so far off the unit won't lock on it. But it immediately locks on my 10MHz GPSDO-Reference and puts out stable frequencies accurate to the 10th digit (mHz)!   :-+
I will have to look for the reason why the OCXO is inaccurate. It's stable on the other hand -that's on the plus side.
The sweep output that the seller described as defective puts out 0.019V at the starting frequency and 1.9V at the stop frequency. On the front there is 0..2V labeled -so that doesn't look too bad, right?
All keys are working, the dial also. Winner! :)

The 3335A is a real boat anchor and has a really loud fan in it (radial axial, 120mmx120mmx40mm AC-powered,metal chassis and propeller) that pushes vast amounts of air through it in short time.
Not really compatible with my wife trying to work in the same room. That's the downside. 3335Aing only at weekends.  |O   :-DD
« Last Edit: October 22, 2017, 09:54:22 am by URI »
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Offline neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3048 on: October 22, 2017, 07:57:05 am »
Well i just looked at the price of a knob for it and at that price i would be better off buying another 7A26 as a parts mule.  :-DD
The missing knob is going to have to sit on the que for a while at that price.
« Last Edit: October 22, 2017, 08:00:05 am by neo »
A hopeless addict (and slave) to TEA and a firm believer that high frequency is little more than modern hoodoo.
 

Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #3049 on: October 22, 2017, 08:20:46 am »
Congrats on your new goodies, neo and URI!
You don't acquire TEA. It acquires you.
 


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