Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 2852712 times)

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Offline beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47600 on: January 22, 2020, 10:57:46 am »
I should pull my finger out and publish some of the long term results with the ltzs. Honestly I think that quite a bit of it comes down to luck - did you get a good ltz and just the right resistor combo for it. I have multiple combinations of pcbs, op amps, resistors and ltz, I think about 70% suck (10+ppm overall true accuracy over the long term - including the box, pcb, reasonable room temp etc) , the others pretty good ie within 2-4ppm long term - as far as I can tell. Looking at all of the references - the 3458 itself looks pretty good - it is an old unit - and I think HP got first dibs on the ltzs and cherry picked the better ones.
I have only had the 3458 calibrated once and it did not seem to like the travel! All its measurements of most of my ltzs were out by 1-2ppm for a month or so after it returned then settled back to pre-cal. It was within spec and no adjustments.
Unfortunately the unit that TiN calibrated for me was not one of the better units.

I am just stepping it up bit at a time and the reality is anything industrial logging wise I need 1-2PPM with decent certainty is all I need and more to make, service and sell the gear I want to now and in future. Sub PPM is another whole level of pain without adding five figures of gear and another couple of $k per year for calibration.

Part of the LTZ and other assorted references plan is converted wine fridge for the references and also modding (decasing it for size reasons) a 34970A to fit inside with them and hold the lot at 20C +-not much then log it seriously over time. Apply that data against the 6 1/2 digit calibrated pair and be happy. The 34401A at least will go back to Keysight this year which is $500'ish and I haven't decided about adding the 34461A to it or not again :-//
Coffee, Food, R/C and electronics nerd in no particular order. Also CNC wannabe, 3D printer and Laser Cutter Junkie and just don't mention my TEA addiction....
 

Online BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47601 on: January 22, 2020, 10:58:13 am »
Has anybody ever tried to use these desoldering blades?
Example: Edsyn RB641

https://www.conrad.de/de/p/edsyn-entloetklingenband-edsyn-rb641-entloetklingenband-rb641-2144527.html



Edit:

This is the holder tool: Edsyn ST-706
https://www.ebay.com/itm/202803481888

« Last Edit: January 22, 2020, 11:07:08 am by BU508A »
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Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47602 on: January 22, 2020, 11:02:36 am »
A description for those who can't be arsed to skip around the video to find the meat of it.

Thank you.

Most videos consume too much of my little remaining life, so I can't be arsed to watch them unless I know it contains worthwhile and moving pictures.
:wtf: Are planning on going SK soon then so you got to cram a lot in before you do  >:D
Who let Murphy in?

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Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47603 on: January 22, 2020, 11:06:41 am »
A description for those who can't be arsed to skip around the video to find the meat of it.

Thank you.

Most videos consume too much of my little remaining life, so I can't be arsed to watch them unless I know it contains worthwhile and moving pictures.

Yeah, I watched that one at 2x speed and it still took too long to get to the point.

-Pat
Yeah, I suppose I could have told you were to wind it to, but then I remembered that we also have a few relatively newbies on board and his words of wisdom might well have been useful to them  :-+
Who let Murphy in?

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Offline beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47604 on: January 22, 2020, 11:08:19 am »
10pm collecting a sipping Scotch and all is well with the shack TEA  8)

Coffee, Food, R/C and electronics nerd in no particular order. Also CNC wannabe, 3D printer and Laser Cutter Junkie and just don't mention my TEA addiction....
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47605 on: January 22, 2020, 11:15:59 am »
He uses one of these ESI 242D https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=ESI+242D&_sacat=0 I won't be adding one to the collection  ::) Details are above in an post from this morning.

I have been going through all the gear in the shack and removing the noticeable offenders. The last one was a simple LED wallwart that was upsetting the Fluke Calibrator at over 1.5m  :-- Off to on was a definite and measurable few PPM.

If I am being careful then PC's and monitors off along with the Coffee machine and the Cal gear is on the back rack with only one mains lead into it. Apart from that I could re arrange and run it off the  decent sized UPS I have but that is another possible source I guess.

Re the 34461A I rate the 34401A I have as more stable.
I  wonder if you guys are as anal with your cars as you are with your DMMs, I mean, your cars have a 0 - 60mph time, do you always check on it looking for those horses that might have escaped over the years  >:D :-DD
Who let Murphy in?

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Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47606 on: January 22, 2020, 11:19:23 am »
Yes, this is precisely the technique I recommended ages ago when we first talked about "Carlson's Great Capacitor Sin Video". Why the fuck does nobody ever listen...? :palm:

mnem
 :horse:

It is not your and my beers, if someone rips solder pad, after watching of carlson lab video.. :-//

My solution by case with minor capitor plague.
Two solder iron!



Those tips look like they need cleaning and so TLC.
Who let Murphy in?

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Online BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47607 on: January 22, 2020, 11:20:40 am »
I am really missing a 6.5 digit speed-indicator in my car.  :(    8)
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 
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Offline beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47608 on: January 22, 2020, 11:28:20 am »
Depends on what you are doing with the results of it.

Some of the coffee and more so food I am looking playing with gear in the order of 0.1C accuracy or better so I need to be able to get well under that for testing and for certainty so a casual check with a 3 or 4 1/2 digit meter and a K type thermocouple won't cut it. Hence some Temperature Cal gear better RTD's calibrated meters and a bit further into the rabbit hole.

Playing with most stuff on the bench an 20 Mhz scope and a $50 meter would still do me like it did for a long time and would do 90+% of all work any of us need for home use but part of it is why we are here I guess

TEA is a bottomless cup  :-DD
Coffee, Food, R/C and electronics nerd in no particular order. Also CNC wannabe, 3D printer and Laser Cutter Junkie and just don't mention my TEA addiction....
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47609 on: January 22, 2020, 11:48:40 am »
I am really missing a 6.5 digit speed-indicator in my car.  :(    8)
Can't measure time with or without a 6.5 digit speed indicator, need a stop watch for that job  :palm:
Who let Murphy in?

Brymen-Fluke-Solartron-HP-Thurlby-Heathkit-Thander-Tek-Extech-Black Star-GW-Advance-Avo
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47610 on: January 22, 2020, 11:50:55 am »
Depends on what you are doing with the results of it.

Some of the coffee and more so food I am looking playing with gear in the order of 0.1C accuracy or better so I need to be able to get well under that for testing and for certainty so a casual check with a 3 or 4 1/2 digit meter and a K type thermocouple won't cut it. Hence some Temperature Cal gear better RTD's calibrated meters and a bit further into the rabbit hole.

Playing with most stuff on the bench an 20 Mhz scope and a $50 meter would still do me like it did for a long time and would do 90+% of all work any of us need for home use but part of it is why we are here I guess

TEA is a bottomless cup  :-DD
Amen to that, or in your case, a coffee cup  :-DD
Who let Murphy in?

Brymen-Fluke-Solartron-HP-Thurlby-Heathkit-Thander-Tek-Extech-Black Star-GW-Advance-Avo
 

Offline Martin.M

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47611 on: January 22, 2020, 11:55:45 am »
got a 502A Keithley.
So I can test forks and spoons  :-//  (milli-Ohm-Meter)
it have a trusted peace of wood to set the distance of the 2 clamps exactly to 10cm,
means readout x10 = Ohms per meter   ^-^

Martin
« Last Edit: January 22, 2020, 11:58:56 am by Martin.M »
 

Offline BravoV

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47612 on: January 22, 2020, 12:01:06 pm »


Bought two of this sacrificial lambs for Thor, "hopefully"  :-[ will save my GPSDO and other T&M equipments if he strikes.

PolyPhaser RF DC pass surge arrestors.

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47613 on: January 22, 2020, 12:27:15 pm »
Probably better that my solution which is roll half the feed up, wrap it in a supermarket bag, tape it up and sling it out the window until the storm has passed :-DD

Random question: does anyone know any reputable sources of decent quality instrument cases from China at all? I can only find ones described as "metal". I'd rather like to know if it's going to go rusty or not  :-DD
 

Online BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47614 on: January 22, 2020, 12:29:54 pm »
Probably better that my solution which is roll half the feed up, wrap it in a supermarket bag, tape it up and sling it out the window until the storm has passed :-DD

Random question: does anyone know any reputable sources of decent quality instrument cases from China at all? I can only find ones described as "metal". I'd rather like to know if it's going to go rusty or not  :-DD

If the source is somewhat related to "Siglent": stay away from it.   :-DD   (no offense @tautech  :)  )
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Offline McBryce

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47615 on: January 22, 2020, 12:32:33 pm »
I am really missing a 6.5 digit speed-indicator in my car.  :(    8)

How inaccurate! So you never really know EXACTLY how fast you are travelling...

McBryce.

 

Online BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47616 on: January 22, 2020, 12:33:42 pm »
I am really missing a 6.5 digit speed-indicator in my car.  :(    8)

How inaccurate! So you never really know EXACTLY how fast you are travelling...

McBryce.

* BU508A is throwing a Heisenberg after McBryce....    :-DD
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 

Offline McBryce

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47617 on: January 22, 2020, 12:37:20 pm »
I'm just imagining the discussion with the Bundespolizist with radar gun in hand: "I wasn't going 70! I was going 68.8273kmh!

McBryce.
 

Online BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47618 on: January 22, 2020, 12:39:52 pm »
I'm just imagining the discussion with the Bundespolizist with radar gun in hand: "I wasn't going 70! I was going 68.8273kmh!

McBryce.

Police officer stops Heisenberg.
Officer: "Do you you know how fast you was driving?"
Heisenberg: "No. But I do know exactly where I am."
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 
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Offline BravoV

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47619 on: January 22, 2020, 12:42:41 pm »
Probably better that my solution which is roll half the feed up, wrap it in a supermarket bag, tape it up and sling it out the window until the storm has passed :-DD

The fun part is when you about to roll or in the middle of rolling it and still connected, Thor does his thingy.  >:D

Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47620 on: January 22, 2020, 01:14:07 pm »
How else am I going to get 1.21 jiggawatts!?
 

Offline Zucca

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47621 on: January 22, 2020, 02:16:58 pm »
Has anybody ever tried to use these desoldering blades?
Example: Edsyn RB641

https://www.conrad.de/de/p/edsyn-entloetklingenband-edsyn-rb641-entloetklingenband-rb641-2144527.html

Edit:

This is the holder tool: Edsyn ST-706
https://www.ebay.com/itm/202803481888


Never used them and I do not like the idea.  :-//
Everything that put (by definition) force on a PCB or on a component is the wrong way to get the job done IMHO.

PCB and electronics components are like ladies, be gentle with them and they will (possibly) make you happy.
...and of course the older they get, the more you need to respect them.
« Last Edit: January 22, 2020, 02:19:25 pm by Zucca »
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Offline Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47622 on: January 22, 2020, 02:25:53 pm »
Probably better that my solution which is roll half the feed up, wrap it in a supermarket bag, tape it up and sling it out the window until the storm has passed :-DD

Random question: does anyone know any reputable sources of decent quality instrument cases from China at all? I can only find ones described as "metal". I'd rather like to know if it's going to go rusty or not  :-DD

No.

Like you I think I'm going to have to invest in a box and pan folder and start making my own boxes.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Offline Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47623 on: January 22, 2020, 02:29:00 pm »
PCB and electronics components are like ladies, be gentle with them and they will (possibly) make you happy.
...and of course the older they get, the more you need to respect them.

O lordy, you haven't been nonna-chasing again have you Zucca?  :)
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 
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Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #47624 on: January 22, 2020, 02:44:42 pm »
Has anybody ever tried to use these desoldering blades?
Example: Edsyn RB641

https://www.conrad.de/de/p/edsyn-entloetklingenband-edsyn-rb641-entloetklingenband-rb641-2144527.html

Edit:

This is the holder tool: Edsyn ST-706
https://www.ebay.com/itm/202803481888


Never used them and I do not like the idea.  :-//
Everything that put (by definition) force on a PCB or on a component is the wrong way to get the job done IMHO.

PCB and electronics components are like ladies, be gentle with them and they will (possibly) make you happy.
...and of course the older they get, the more you need to respect them.

I doubt that the blade would have sufficient thermal mass to melt the solder as it was being pushed under the "leg" anyway
Who let Murphy in?

Brymen-Fluke-Solartron-HP-Thurlby-Heathkit-Thander-Tek-Extech-Black Star-GW-Advance-Avo
 


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