Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 3000658 times)

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Online mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54000 on: March 30, 2020, 12:16:24 pm »
grr. clog. furry print fail. |O going back to bed.

mnem
also, grr.
 

Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54001 on: March 30, 2020, 12:19:40 pm »
So this morning (before having enough coffee), I accidentally blew my Hao Qi Xin voltage reference by connecting it to the wrong charger. It now no longer charges or turns on (even after manually charging the Lipo back up). Is there a schematic floating around for this device, or is it not worth repairing, ie: cheaper to buy a new one?

Do you mean one of those?

https://www.markhennessy.co.uk/ad584_references/

Yes, the top one with the plexiglas case.

McBryce.

I have 2 of those KKMoon references and they are accurate and stable at room temperature.

And now you are having a proper instrument to measure them all day long.  :-DD

Indeed. And after I re-cap the power supply I'll do a similar comparison as shown in that link. The replacement capacitors will be delivered later today.

An old gray beard with an attitude.
 

Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54002 on: March 30, 2020, 12:23:56 pm »
grr. clog. furry print fail. |O going back to bed.

mnem
also, grr.

First:


Then:
“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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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54003 on: March 30, 2020, 12:28:10 pm »
grr. clog. furry print fail. |O going back to bed.

mnem
also, grr.

Why would you print a furry?  :-DD
 

Offline beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54004 on: March 30, 2020, 12:33:44 pm »
grr. clog. furry print fail. |O going back to bed.

mnem
also, grr.

So much pain could have been avoided - Ender 3 :-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....
 
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Offline jxjbsd

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54005 on: March 30, 2020, 12:38:08 pm »
I feel like I'm hopeless because TEA  :palm:
« Last Edit: March 30, 2020, 12:40:06 pm by jxjbsd »
Analog instruments can tell us what they know, digital instruments can tell us what they guess.
 
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Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54006 on: March 30, 2020, 12:45:04 pm »
I feel like I'm hopeless because TEA  :palm:

Welcome to the TEA.  :)  :-+

@med6753: Look! You've a new friend now.  :-+  :-DD
“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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Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54007 on: March 30, 2020, 12:53:13 pm »

- Documentation available in Japanese only
- no schematics available

Personal conclusion:
If it was available for 1K€-1.5k€ I wouldn't go for it because of the cons, especially the missing docs.
Spend more time to save money to get a 3458A later.   >:D    :popcorn:

The lack of schematics is a real issue with this kind of meter as it essentially makes it unrepairable except for the most basic of faults.
For the 1281, the service manual is one of the most detailed I have seen and weighs very strongly in its favour.

TBH, the documentation is the nest thing I look for when looking at TE, if its not available, steer well clear of it. Also, I meant that there is a lot of people who will be struggling to keep heads above the water line over next weeks or so until the various government aid trickles through to them so many will be looking to liquify their assets because no one really knows just we will be facing in a few months time.
Who let Murphy in?

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

Offline AVGresponding

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54008 on: March 30, 2020, 12:58:29 pm »
I feel like I'm hopeless because TEA  :palm:

Not at all, it gives you something to do during the lockdown!

Welcome to the rabbit-hole entrance...   :-DD
nuqDaq yuch Dapol?
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Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54009 on: March 30, 2020, 01:01:37 pm »
And the silent key sales  :-DD

Assuming it all doesn't end up at the council tip when relatives haven't got time to deal with it. Or they put it directly in the wheelie bin for the fortnightly collection, as the tips are all closed at the moment, which will probably happen even though e-waste isn't meant to go in the bin.

David

That's a fair possibility. I bought some stuff of gumtree about 10 years ago (a couple of PL bench power supplies) and the woman was just selling the things that looked like they were worth something. There was a pile in the corner with a vintage Drake full line ham shack that was going to be disposed of because it was old :palm:. I did consider offering to dispose of it for her but I wasn't interested in ham radio then and didn't want the hassle but I explained how much it and all the other stuff around was worth and pointed her at ebay. I watched her sell it all for just short of £3k. I can imagine how much stuff just goes in a skip.
Yep, whenever I make a trip to our local tip, there are special bays for old appliances and electronics and the staff there are pretty switched on and anything that looks remotely interesting is whisked away and put way beyond where the public cannot access, so I suspect that they list on various sites for sale.
Who let Murphy in?

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

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54010 on: March 30, 2020, 01:04:52 pm »
grr. clog. furry print fail. |O going back to bed.

mnem
also, grr.

First:


Then:

Haha, waking the dwagon up is real easy to do, just take or hide his beloved yellow Fluke 189  >:D :-DD
Who let Murphy in?

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

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54011 on: March 30, 2020, 01:05:10 pm »
No Datron 1281 for me. The auction went crazy in the last minute (as always) and ended at 12,611kr - way too rich for me.

Ah well, let's see if the coming fire sales turn up anything good.
  Lord of Sealand
 

Offline Kosmic

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54012 on: March 30, 2020, 01:15:04 pm »
@bd: Good news your feeling better!   :-+

If you are looking for a decent 8.5 digit DMM, perhaps this could be interesting. No affiliation with the seller.

https://www.ebay.com/itm/184044642421

Picture from the auction:


Yep, it's an interesting piece of TE indeed. Have read much of the available information on xdevs and linked sites including the thread on the eevblog forum.

Pros:
- It's in the league of the 3458A
- It's offers tend to around 1/3 of those for the 3458A
- Some specs are better than 3458A
- Very comprehensible UI
- Easy calibration (cost!)
- lightweight

Cons:
- Linearity seems to be "only" 2/3 of the 3458A
- some specs are worse the 3458A
- Documentation available in Japanese only
- no schematics available

Personal conclusion:
If it was available for 1K€-1.5k€ I wouldn't go for it because of the cons, especially the missing docs.
Spend more time to save money to get a 3458A later.   >:D    :popcorn:

Cons:
- 120 or 300 V max (depending on the model)
- No AC, ACI

FYI, look like this seller is ready to let them go at 1200$  ;)
« Last Edit: March 30, 2020, 01:19:17 pm by Kosmic »
 
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54013 on: March 30, 2020, 01:17:02 pm »
Haha, waking the dwagon up is real easy to do, just take or hide his beloved yellow Fluke 189  >:D :-DD

Or let med near it with his can of blue Krylon ;)
 
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Offline Brumby

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54014 on: March 30, 2020, 01:33:29 pm »
Haha, waking the dwagon up is real easy to do, just take or hide his beloved yellow Fluke 189  >:D :-DD

Or let med near it with his can of blue Krylon ;)

Wash your mouth out with hand sanitiser!!!
 
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Offline McBryce

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54015 on: March 30, 2020, 01:36:33 pm »
So this morning (before having enough coffee), I accidentally blew my Hao Qi Xin voltage reference by connecting it to the wrong charger. It now no longer charges or turns on (even after manually charging the Lipo back up). Is there a schematic floating around for this device, or is it not worth repairing, ie: cheaper to buy a new one?

Do you mean one of those?

https://www.markhennessy.co.uk/ad584_references/

So I decided to do some diagnosis. The charge controller (UN8HX) and a dual MOSFET (8205A) which seems to have been doing input protection are both fried. When I remove/by-pass these, the device still works as expected. If I had them in my parts bin, I'd go to the bother of fixing the voltage reference, but the cost of the parts plus shipping from China is about the same as buying a new device and the shipping time would probably be the same too. I may convert it to run from an 18650 (if I could be arsed, which I couldn't be at the moment).

McBryce.
 

Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54016 on: March 30, 2020, 01:46:33 pm »
So this morning (before having enough coffee), I accidentally blew my Hao Qi Xin voltage reference by connecting it to the wrong charger. It now no longer charges or turns on (even after manually charging the Lipo back up). Is there a schematic floating around for this device, or is it not worth repairing, ie: cheaper to buy a new one?

Do you mean one of those?

https://www.markhennessy.co.uk/ad584_references/

So I decided to do some diagnosis. The charge controller (UN8HX) and a dual MOSFET (8205A) which seems to have been doing input protection are both fried. When I remove/by-pass these, the device still works as expected. If I had them in my parts bin, I'd go to the bother of fixing the voltage reference, but the cost of the parts plus shipping from China is about the same as buying a new device and the shipping time would probably be the same too. I may convert it to run from an 18650 (if I could be arsed, which I couldn't be at the moment).

McBryce.

MOSFET 8205A from Spain:
https://www.ebay.de/itm/254326264012

UN8HX from Lithuania:
https://www.ebay.de/itm/114111394681
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 

Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54017 on: March 30, 2020, 01:54:34 pm »
So this morning (before having enough coffee), I accidentally blew my Hao Qi Xin voltage reference by connecting it to the wrong charger. It now no longer charges or turns on (even after manually charging the Lipo back up). Is there a schematic floating around for this device, or is it not worth repairing, ie: cheaper to buy a new one?

Do you mean one of those?

https://www.markhennessy.co.uk/ad584_references/

So I decided to do some diagnosis. The charge controller (UN8HX) and a dual MOSFET (8205A) which seems to have been doing input protection are both fried. When I remove/by-pass these, the device still works as expected. If I had them in my parts bin, I'd go to the bother of fixing the voltage reference, but the cost of the parts plus shipping from China is about the same as buying a new device and the shipping time would probably be the same too. I may convert it to run from an 18650 (if I could be arsed, which I couldn't be at the moment).

McBryce.
Yeh, the UN8HX on mine blew as it sits right below the positive socket and a slightly long banana plug touched it and shorted it. Replaced it and placed some Kapton tape over it, and its back in operation again.
Who let Murphy in?

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

Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54018 on: March 30, 2020, 01:57:15 pm »
Also, I meant that there is a lot of people who will be struggling to keep heads above the water line over next weeks or so until the various government aid trickles through to them so many will be looking to liquify their assets because no one really knows just we will be facing in a few months time.

My self-employed daughter will get zero; she falls through all the cracks.

Too much money in a save-to-buy-house ISA => no universal credit.
No business premises => no business grants.
Only started trading last year => no self-employment grant.
etc.
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's 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
 
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Offline McBryce

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54019 on: March 30, 2020, 01:58:44 pm »

MOSFET 8205A from Spain:
https://www.ebay.de/itm/254326264012

UN8HX from Lithuania:
https://www.ebay.de/itm/114111394681

Thanks, saw those, but the 8205A needs to be a TSSOP-8 package, using a SOT23-6 would be too much messing about for my liking. The spanish offer is misleading. He says TSSOP-8 but shows a SOT23-6.

Also, the total for both components would be almost €10. I can buy the entire device for €14 delivered.

McBryce.
 

Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54020 on: March 30, 2020, 02:01:04 pm »
Haha, waking the dwagon up is real easy to do, just take or hide his beloved yellow Fluke 189  >:D :-DD

Or let med near it with his can of blue Krylon ;)

Wash your mouth out with hand sanitiser!!!

Is acetone a hand sanitisier? 

I once washed my mouth out with (a small amount of) acetone in a school chemistry experiment. I was sucking it out of a beaker using a pipette, and there wasn't quite enough in the beaker - so air was entrained.
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's 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
 

Offline AVGresponding

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54021 on: March 30, 2020, 02:57:18 pm »
UPS just delivered 2... UPS's    :P

I say delivered, more like played knock-a-door-run, which is pretty much standard at the moment.

They are only baby ones, that I got for fifteen quid each shipped:


They're worth it just for the multi-way surge protected sockets, with the nice large casings giving me the ability to add remote switch outputs using big relays. The batteries (not included) are only 5Ah, can't imagine much back-up time with that...

As expected, the inverter outputs are laughably horrible:


I certainly won't be using them for any TE!   :-DD  I have a 1500VA true sine inverter for that anyway.

I might use the inverter guts for backing up some lighting where I still use incandescants, or just salvage the parts.


That posting about AD584 references got my trigger finger twitching, and I duly did the deed on a couple of different ones from Shenzen, both claiming to be using the L grade. We shall see.
nuqDaq yuch Dapol?
Addiction count: Tektronix-Hameg-Fluke-HP-TTi-Solartron-Thurlby-IsoTech-Black Star-Micronta-Mastech-UniT
 
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54022 on: March 30, 2020, 03:07:59 pm »
Chuckle brothers grade sine that. To me, to you, to me, to you.
 
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Offline AVGresponding

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54023 on: March 30, 2020, 03:14:21 pm »
Chuckle brothers grade sine that. To me, to you, to me, to you.

:-DD

I could probably get it to look like a "modified sine wave", but there's really no point.
nuqDaq yuch Dapol?
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Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #54024 on: March 30, 2020, 03:39:17 pm »
I feel like I'm hopeless because TEA  :palm:

Welcome to the TEA.  :)  :-+

@med6753: Look! You've a new friend now.  :-+  :-DD

Definitely!  :-+ ;D
An old gray beard with an attitude.
 


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