Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 223381 times)

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Offline Vtile

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2050 on: September 13, 2017, 07:37:14 AM »
I quite like the fuzzy look of Nixies - at my age most things are like that !

(The latter was doubly irritating since they also had a 1.00000000kg weight in a nice display case)
Did you make an offer for that nice, almost a 1 kg, hunk of silicon?

No, my backpack was too full as it was :(

I think they were wise not to leave it on the stand overnight :)
At the movies there would have been in the morning only a waterballoon filled with a liter of water.  :D
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Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2051 on: September 13, 2017, 09:21:32 AM »
The addiction struck again. When I go on E-bay I lose all control. Another vintage Fluke to join the menagerie. Fluke 8600A. Should be here in a few days. Of course I'll give a full report when it arrives. Just like I did with the other recent Fluke acquisitions.

"I love the warm glow of vintage red LED's in the morning"  :-+ 


(Stock pix, not the actual unit)

It arrived yesterday. As I unpacked it I found that the bail was broken in shipment. No big deal, epoxy fixed that. It had a last calibration date of June 13, 2016 so that looked promising. Initial DCV readings were spot on. Everything was great until I tried different ranges. Tried ACV and again it was good. But as soon as I switched back to DCV there was buzzing and the reading dropped to zero. Tried ACV again and it was OK. Ohms was OK. DCV dead. It appears that one of the many relays in this unit is either stuck or died. I did a quick check of the power supply and it's OK. So it goes on the project shelf for now until I get around to it. Oh well.
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2052 on: September 13, 2017, 09:34:12 AM »
Those reed relays are dodgy as hell. The coil goes phut. Mine was bust on the 200v range. On the positive side, the board with the reed relays on is easy enough to get out. I desoldered the old relay and replaced it with a standard 5v reed relay I found on Farnell. The voltage rating was less but the drop across the switch contacts and the insulation rating wasn't exceeded. Obviously it's a completely different package so and the original ones are unobtainium so you'll have to use some creative jumping. Works as good as new now. For reference, the reeds have 4 terminals. The two outside ones are the switching element and the two inside ones are the coil. You can do a continuity test on the coil to see which one is dead.

Got to be honest I was a little worried and depressed when I found out the range was dead but it wasn't that hard to fix. The auto range works nicely as well now rather than getting stuck.

I have purchased an older, considerably more dodgy meter this evening, a Heathkit V-7AU VTVM. Knowing my luck it'll have been assembled by a wally and have a leaked battery in it and the selenium rectifier will emit flames instantly. Fingers crossed. Edit: oh also I hope it smells right. I want equipment that smells like it means business i.e. that warm carbony smell, not of glue which is what all the Chinese crap smells of.
« Last Edit: September 13, 2017, 09:37:24 AM by bd139 »
 

Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2053 on: September 13, 2017, 10:20:47 AM »
Those reed relays are dodgy as hell. The coil goes phut. Mine was bust on the 200v range. On the positive side, the board with the reed relays on is easy enough to get out. I desoldered the old relay and replaced it with a standard 5v reed relay I found on Farnell. The voltage rating was less but the drop across the switch contacts and the insulation rating wasn't exceeded. Obviously it's a completely different package so and the original ones are unobtainium so you'll have to use some creative jumping. Works as good as new now. For reference, the reeds have 4 terminals. The two outside ones are the switching element and the two inside ones are the coil. You can do a continuity test on the coil to see which one is dead.

Got to be honest I was a little worried and depressed when I found out the range was dead but it wasn't that hard to fix. The auto range works nicely as well now rather than getting stuck.

I have purchased an older, considerably more dodgy meter this evening, a Heathkit V-7AU VTVM. Knowing my luck it'll have been assembled by a wally and have a leaked battery in it and the selenium rectifier will emit flames instantly. Fingers crossed. Edit: oh also I hope it smells right. I want equipment that smells like it means business i.e. that warm carbony smell, not of glue which is what all the Chinese crap smells of.

Yea, My plan is to check the relays....including that main range switching relay in the front of the board by the inputs. Other projects have priority at the moment.

I have a Heath V-5 VTVM. You can replace the selenium rectifier with a generic 1N4003. It will raise the B+ due to it's smaller forward drop but it won't matter. The 1% precision resistors should be OK but the carbon resistors probably have drifted high. Also re-cap it. And chances are the vacuum tubes are OK.     
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2054 on: September 13, 2017, 04:04:15 PM »
Apparently the VTVM looks like it works so that is indeed the plan. I had a selenium rectifier go off in some old kit once and I don't wish to reproduce that smell so I've already ordered a bag of slightly higher spec 1n4007's and a new filter cap rated at 200v. I'll keep fingers crossed for everything else and diagnose on the fly. quite surprised to find that RS here in the UK still sell 12AU7's if the worst comes to the worst.
 

Offline SeanB

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2055 on: September 14, 2017, 04:07:47 AM »
I quite like the fuzzy look of Nixies - at my age most things are like that !

(The latter was doubly irritating since they also had a 1.00000000kg weight in a nice display case)
Did you make an offer for that nice, almost a 1 kg, hunk of silicon?

No, my backpack was too full as it was :(

I think they were wise not to leave it on the stand overnight :)
At the movies there would have been in the morning only a waterballoon filled with a liter of water.  :D

I have a set of masspieces, up to 100g in a set, that I know the mass of to 4 decimals, and the 1g one is exactly 1.0000g as well, even got ( by accident with a miscommunication) the mass of the 5mg masspieces as well, though those are only to 3 digits and with a higher uncertainty on them.

Nice to go into the actual metrology lab itself, with all the Mettler Toledo comparasion massmeters that they use to check the masspieces, and the calibrated weighbridge they have, which goes up to 20 tons, complete with crane, used for the larger portable masspieces. Biggest ones they have sit on a railway siding nearby, as there is no rail line to them, otherwise the 200 ton railcar would be there as well. When the lab was in the old premises I also got to see the primary reference, in it's nice wooden and glass display case, sitting on the felt pad, but the cal part was split from the reference and I do not get to see the basement lab any more with the walk in safe built into a hillside.
 

Offline SeanB

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2056 on: September 14, 2017, 04:10:12 AM »
Apparently the VTVM looks like it works so that is indeed the plan. I had a selenium rectifier go off in some old kit once and I don't wish to reproduce that smell so I've already ordered a bag of slightly higher spec 1n4007's and a new filter cap rated at 200v. I'll keep fingers crossed for everything else and diagnose on the fly. quite surprised to find that RS here in the UK still sell 12AU7's if the worst comes to the worst.

Please also put a 33R 2W resistor ( pretty much any value between 22R and 100R, depending on actual current draw of the unit) in series with the diode, to limit the current peaks to something the transformer and capacitors can handle without failure. Otherwise the peak currents will stress the old transformer.
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2057 on: September 14, 2017, 05:32:44 AM »
It will be charging up a relatively small (new sprague atom) 20uF cap to 150v and usual current draw is a couple of mA.  Not sure if it's worth it for that. The filament winding is drawing an order of magnitude more watts.  I used to play with old valve radios when I was a kid and never bothered.
 

Online bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2058 on: September 14, 2017, 07:24:23 AM »
Nice to go into the actual metrology lab itself, with all the Mettler Toledo comparasion massmeters that they use to check the masspieces, and the calibrated weighbridge they have, which goes up to 20 tons, complete with crane, used for the larger portable masspieces. Biggest ones they have sit on a railway siding nearby, as there is no rail line to them, otherwise the 200 ton railcar would be there as well.

up to 20 tons <--  :o --> portable masspieces
It's TEA time! You know you want some.
 
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Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2059 on: September 14, 2017, 09:42:14 AM »
Its so nice to see that I'm not the only one that has trouble in ignoring the bargains to be had on Ebay etc when it comes to old test equipment.

It all started for me when I was an apprentice electrical engineer way back in 1964 when I would go along to ogle the test meters in the local radio spares shop window, frustrated because I could not afford to buy them in those days. Then one of the local Marconi factories had a clear out and the shop brought up some of the test gear and they had in their window a Cossor 1035 dual beam oscilloscope that I saved up and purchased a few weeks later. The rest was history from there, followed by a new test meter TMK500 which I still have today. I then got married and along came children which meant that once again I could not afford anything so I thought I was cured and settled down to the humdrum world of sofa sitting watching TV for years. This was injected with the odd purchase later on as the kids got older of the occasional meters etc. until I lost my job last year at the age of 67 and I had time to reflect on what I was going to do with my time as I thought it would be the end of my working life so I decided that I could buy up old radios etc that needed repairs and then sell them on, to provide something to keep me occupied and maybe bring in the occasional odd bit of money to aid my pension, well that was the idea.This of course meant the purchase of more test gear etc in order to do that.

I now am the proud owner of the following items of test gear in my kit.

Working items.
TMK 500 multimeter,
TMK 700 multimeter,
Robin 1503 multimeter,
Robin OM 840 digital multimeter,
Proster VC97 digital multimeter,
2 x Beside ADM08A digital multimeters,
Iotech UA6243L LCR meter,
Avo Model 8 multimeter,
HP 3466A digital bench multimeter,
Philips PM 2521 digital bench multimeter,
Heathkit V7A valve voltmeter,
Isotech IDM 203 digital bench multimeter,
Tech TE20D AM RF signal generator
Marconi TF 995a/5 AM/FM RF signal generator,
Rapid 7025A 20Mhz analogue oscilloscope,
Iwatzu SS5710 60Mhz analogue oscilloscope,
LG Goldstar OS 9100D 100Mhz analogue oscilloscope,
Hitachi V525 50Mhz analogue oscilloscope,
XJW01 LCR and ESR meter,
Minghe MHS-5200A function generator and counter,
Kikusui 1502 digital bench multimeter,
Velleman DVM13MFC multi function counter,
2 digital display bench power supplies (1 linear and 1 SMPS),
Digital Hakko 966D clone solder station,
Digital 858D hot air gun for smd work,
Digital Duratool desoldering station.
Heathkit IG 4505 oscilloscope Calibrator

Items under going repairs
Hameg HM408-1A 40Mhz analog storage oscilloscope,
HP 1740A 100Mhz analog oscilloscope,
Peachtree Type 450 AM/FM RF signal generator.

Along the way I have manged to buy / obtain a few bits and bobs, repair them and sell on again, although nowhere near what I was planning to do, there was always a nice piece of test gear to tweak etc ... and so it goes on and on ....  :-DD

So do you think that I fit into the TEA category or not, I certainly need help  :palm:

Wait there's help just around the corner, I think there's a prospect of a job again so I'll have less time to buy more test gear thats for sure if it comes off.



Who let Murphy in?
 

Online bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2060 on: September 14, 2017, 10:31:12 AM »
Looks like you'd fit right in. However, your fixed list looks to be out of proportion to your repair list. :-DD

Lemme tell you, all the goodies in today's Equipnet auction was mighty tempting. Some stuff I was checking out didn't even get bid on. Alas, my lab and queue is just too full right now. That's my excuse and I'm sticking with it (at least for as long as it holds out). ;D
It's TEA time! You know you want some.
 

Online xrunner

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2061 on: September 14, 2017, 10:35:52 AM »
Its so nice to see that I'm not the only one that has trouble in ignoring the bargains to be had on Ebay etc when it comes to old test equipment.

Hey looks like you followed my link here from the other thread!  :)

Yea you belong here - oh yea. I personally would love to see some pics of the gear you have especially the lesser known makes.
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 

Online bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2062 on: September 14, 2017, 10:37:58 AM »
Yeah, xrunner, you beat me to it. Good recruiting job! ^-^
It's TEA time! You know you want some.
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2063 on: September 14, 2017, 11:31:47 AM »
Its so nice to see that I'm not the only one that has trouble in ignoring the bargains to be had on Ebay etc when it comes to old test equipment.

Hey looks like you followed my link here from the other thread!  :)

Yea you belong here - oh yea. I personally would love to see some pics of the gear you have especially the lesser known makes.
Ok, let me know what you'd like to pics of and I'll see what I can do.
Who let Murphy in?
 

Online Cubdriver

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2064 on: September 14, 2017, 12:28:35 PM »
Its so nice to see that I'm not the only one that has trouble in ignoring the bargains to be had on Ebay etc when it comes to old test equipment.

Hey looks like you followed my link here from the other thread!  :)

Yea you belong here - oh yea. I personally would love to see some pics of the gear you have especially the lesser known makes.
Ok, let me know what you'd like to pics of and I'll see what I can do.

We'll make it easy.  All of it.   ;D

And welcome to the TEA party.

-Pat
If it jams, force it.  If it breaks, you needed a new one anyway...
 

Offline Berni

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2065 on: September 14, 2017, 03:17:37 PM »
Looks like you'd fit right in. However, your fixed list looks to be out of proportion to your repair list. :-DD

Lemme tell you, all the goodies in today's Equipnet auction was mighty tempting. Some stuff I was checking out didn't even get bid on. Alas, my lab and queue is just too full right now. That's my excuse and I'm sticking with it (at least for as long as it holds out). ;D

I was on the auction but the main piece i was drooling over (6GHz network analyzer) i kept getting outbid on by some asshole, battled him well in to the night but eventually i gave up and went to bed. It didn't go the way i planed, all i got is one boatanchor and some fancy digital calipers, both under the reserve price so fingers crossed that they take my offer.
« Last Edit: September 14, 2017, 03:21:05 PM by Berni »
 

Online bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2066 on: September 14, 2017, 03:36:35 PM »
Yeah, the cool stuff went for way too much money. The risk was higher than I'd have liked, too, especially at those prices. Hardly anything had useful condition information. A few items were clearly identified as broken in the description. However, others had obscured red reject tags, yet weren't identified as such in the description. One has to wonder about the items that had stickers from used test equipment retailers/refurbishers (BER?).

I almost went for some power supplies, but closed the browser before it was too late. :-DD
It's TEA time! You know you want some.
 

Offline Berni

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2067 on: September 14, 2017, 04:11:41 PM »
Yeah, the cool stuff went for way too much money. The risk was higher than I'd have liked, too, especially at those prices. Hardly anything had useful condition information. A few items were clearly identified as broken in the description. However, others had obscured red reject tags, yet weren't identified as such in the description. One has to wonder about the items that had stickers from used test equipment retailers/refurbishers (BER?).

I almost went for some power supplies, but closed the browser before it was too late. :-DD

Yeah the vague and maybe even wrong descriptions of the working state are my biggest problem with this auction. Because of that i only went for what i could get for cheap. If it has a not working tag on it then at least take a photo of the tag. I still don't mind buying something broken as long as i get some info on the fault, so that i can take a guess if its easily fixable. I had 'broken' equipment before that just needed a new fuse and that's it.
 

Online bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2068 on: September 14, 2017, 04:14:28 PM »
I concur on all counts. :-+
It's TEA time! You know you want some.
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2069 on: September 14, 2017, 04:28:24 PM »
There are a few private auctions here in the UK I've scored on. I was in money making mode at the time so I didn't keep any of it. This was before TEA :(

The one thing I regret selling is the Tek 7613 and 7L12 spectrum analyser which still had a calibration certificate. I kept the Tek 475 I had in that lot for a bit but had a stupid moment of "100MHz is enough" and got rid of it.

My wife keeps asking me when I'm selling the HP 1740A I just restored. She doesn't get the idea of never! :)
 

Online bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2070 on: September 14, 2017, 04:36:46 PM »
My wife keeps asking me when I'm selling the HP 1740A I just restored.

 :o :scared:
It's TEA time! You know you want some.
 

Offline Fungus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2071 on: September 14, 2017, 05:04:12 PM »
My wife keeps asking me when I'm selling the HP 1740A I just restored. She doesn't get the idea of never! :)

Wouldn't you rather have a modern one?
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2072 on: September 14, 2017, 05:35:18 PM »
Actually no not really, well not a DS1054Z anyway. I had a 1054Z for about a month and ended up using the analogue scopes because of the amount of noise coming out of the damn thing. I like to sit in complete silence and think with a circuit in front of me.
 

Offline Fungus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2073 on: September 14, 2017, 05:54:00 PM »
There's fanless DSOs out there.  :popcorn:

The little Hamegs leap to mind. They're quite "analog" in function, too.


 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2074 on: September 14, 2017, 06:11:43 PM »
Indeed you are right. That might be the next step :)

However, I *need* an SA first. That's next on the shopping list.

Another purchase I forget: another counter. Black Star Meteor 600 and only because it has a 10MHz reference input (time nuts here I come). The Rigol DG1022Z counter is totally shit. No sensitivity at all (100mV P-P if you are lucky). Very much regretting selling my 5315A now as it had the option C and OCXO in it.

Future reference: if you have something nice and HP, don't sell it to buy some Chinese crap :)
 


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