Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 257253 times)

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Online neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2750 on: October 13, 2017, 10:09:21 AM »
Lack of funding already has put a stop to the majority of my TEA.

In lighter news, SUCCESS! I connected channel 1 and 2 together and used channel 2 as the trigger and after alot of fine fiddling around with buttons i got it to lock onto and read the 30 MHz signal.
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Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2751 on: October 13, 2017, 10:14:26 AM »
What scope are you using?
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Online neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2752 on: October 13, 2017, 10:19:31 AM »
Hitachi V-1065A. Interestingly enough i just spent a week trying to figure out how to make this scope work for frequencies this high just to see what the output could do, current wise, before collapsing.

Should a ring oscillators oscillation look like a sine wave?
« Last Edit: October 13, 2017, 10:26:53 AM by neo »
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Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2753 on: October 13, 2017, 10:34:28 AM »
Well that baby is good for 100Mhz and as such you should not require to provide any external sync signal to get the trigger to lock onto the incoming signal. It sounds as if it does need to be calibrated and you can do that job pretty well yourself. Keep an eye open on Ebay for a Heathkit IG4505 and you can do it reasonably well with that without all other expensive kit provided you don't require it to be calibrated to Lab standards.

shows how to use this unit.
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Online neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2754 on: October 13, 2017, 10:38:22 AM »
I think mine may be slightly dodgy, using it has always been possible given the right amount of time but trying to get it to lock onto 30MHz has been like pulling teeth.
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Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2755 on: October 13, 2017, 10:53:12 AM »
Like bd139 said, if you do the cal steps you might find that it works far better. I have 4 working scopes right now (had 6 at one time but sold 2 and I'm working another 2 on the bench as well) and in almost each case when I acquired them they were not performing correctly. Opening them up and cleaning the switches and controls made a lot improvements in their performance. Have you watched the video, he does make the point that you could surround yourself with a load of other high cost equipment to do the same job as the Heathkit unit.
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Online neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2756 on: October 13, 2017, 11:13:06 AM »
I am watching it now, definitely want one. The noise in the video is slightly annoying is the only reason i don't have it watched yet.
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Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2757 on: October 13, 2017, 11:41:42 AM »
Well I see that you're in the USA and I did a quick Ebay search and there is one on there right now on Buy it Now or best offer, might need a little bit of cleaning etc and the last owner has added his own reference voltage it seems, anyway here is the link http://www.ebay.co.uk/itm/Vintage-Heathkit-Ig-4505-Deluxe-Oscilloscope-Calibrator-/202061628998?epid=1603942225&hash=item2f0bcfc646:g:odgAAOSwQm9Zw~dX
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Offline MarkL

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2758 on: October 13, 2017, 12:17:08 PM »
...
Keep an eye open on Ebay for a Heathkit IG4505 and you can do it reasonably well with that without all other expensive kit provided you don't require it to be calibrated to Lab standards.
There's also the Heathkit IG-4244 to watch for, which is an update to the IG-4505.  It goes to 100MHz and has <1ns rise time, and adds a sine wave output for adjusting trigger circuits.  One sold in August for $70.
 

Online neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2759 on: October 13, 2017, 12:19:13 PM »
I saw that and i want it but right now i am so broke it ain't funny.
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2760 on: October 13, 2017, 04:42:49 PM »
If you’re broke, that’s the best time to do it. All the cool things I have made were when I was broke. When I’m not broke I just buy kit and play with it.

If you look inside the scope calibrators they’re not particularly clever little boxes. Not sure why they fetch such a high price.  You can calibrate a scope to a reasonable degree with a 10Mhz crystal oscillator and some divider ICs. Vertical cal can be done with a battery, pot and DMM. Rise time of a 100MHz scope is in the order of 3.5ns so you don’t need a crazy fast edge. I reckon you could build something superior for $5 of stuff from Tayda.
 

Online Berni

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2761 on: October 13, 2017, 05:35:53 PM »
Engineers are indeed the most creative when limits are placed upon them. When they have only basic components to get the job done they will toll late in to the night and make the components do impressive things that they ware never designed to do just to get the job done.

When not given limits we just go "That 20$ chip off digikey does what i need, job done"

 

Offline tautech

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2762 on: October 13, 2017, 06:08:41 PM »
Argh yes, the Bedford TK and the Thames Trader, the best selling trucks of the period.
I get to drive my neighbours 400hp Misti 8 wheeler a bit when he's short handed, amazing how far trucks have progressed since we were kids. Its 18 speed Road Ranger was a bit daunting at first and it's got a 9m deck so it's a bit of a monster. When fully loaded it's 25 tonne all up and you always need to plan ahead on some of the steep and windy roads here in NZ. Great fun around town where everyone keeps out of your way.

My youngest went to the states twice for their 6 month harvest season where he learnt to drive the RR's clutchless, clever little bugger can shift up, down and split gears uphill or downhill and with no clutch.  :scared:
This dog is too old to learn those tricks.  :phew:
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Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2763 on: October 13, 2017, 06:48:37 PM »
If you look inside the scope calibrators they’re not particularly clever little boxes. Not sure why they fetch such a high price.  You can calibrate a scope to a reasonable degree with a 10Mhz crystal oscillator and some divider ICs. Vertical cal can be done with a battery, pot and DMM. Rise time of a 100MHz scope is in the order of 3.5ns so you don’t need a crazy fast edge. I reckon you could build something superior for $5 of stuff from Tayda.

Exactly; saved me the trouble of writing that. With skill, thought and imagination, it is possible to do much more with much less.

Specialised test equipment and instructions (especially scope calibration instructions) often call for specialised test gear for two reasons:
  • technicians can follow a do-what-I'm-told process to get a result that conforms to a defined corporate process
  • it makes writing such step-by-step instructions much easier
Note that isn't the whole story, but it is certainly a 90% story sufficient to get a scope working again.

OTOH engineers that understand the details of what they are trying to achieve can often find other way of skinning a cat. You've mentioned a couple of techniques, but obviously there are others.

Any crystal controlled oscillator (e.g. a cheap DDS unit) is more than sufficiently accurate for calibrating a timebase.
Calibrating voltage and linearity is made easier with any form of step-based attenuator. Understanding the front-end's construction and operation means that each gain stage (actually attenuation!) means you don't need high voltages.
Probably the trickiest is tweaking to get good transient behaviour. That requires any modern logic gate plus VHF/UHF construction techniques.
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 #2764 on: October 13, 2017, 06:58:15 PM »
Spot on. I’m actually trying to build a “$2 avalanche pulse generator” at the moment to check rise time. $2 is less than the price of the transistor specified in AN47 at the moment :)

High voltage caps? Nah, Chinese electrolytics in series :)

This is also, importantly, more fun!
 

Offline Ero-Shan

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2765 on: October 13, 2017, 08:53:53 PM »
So, here's my first posting (hope I don't make any mistake).

My company is relocating and therefor filling the dumpsters with older TE that has accrued over several years and is defective or no longer in use.
Of course I'm not a TEA, but how could I just stand there and throw all this equipment out? So I asked and got permission to take what I want.  Needless to say, in no time I had a huge pile of stuff.  ;)
Yesterday, the first batch (no way everything would fit) was loaded in a car and driven home to me. Here's what I saved from imminent destruction:

HP: 3456A, 3458A, 8018A, 6032A, 4 x 6114A, 4 x 3478A
Solartron: 4 x 7150, 2 x 7045, 7050, 7140
Fluke: 45, 2 x 8050, 8040A
Data Precision: 3500
LeCroy: 9450
Philips: PM 2521
Tektronix: TM504, FG504, DC505A
TET electronics: PEL 60-1000
Prema: 5000
Siemens: Stabizet D2428

I admit that I had a bout of ESD since I acquired an FG503 for the empty slot in the TM504 (even before I had it   ::)).
The next carload will have the oscilloscopes (nothing fancy), further 8050's, and other stuff.

As I said, I'm not afflicted by TEA. I can stop every day.  ^-^

Please forgive the lousy picture quality.
 

Online Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2766 on: October 13, 2017, 09:11:35 PM »
Wow, what a nice haul you got. Where are you based in the world? I notice that you have a Phillip's 2521 and I've been looking for another as the one I have is in a sorry state due to in part broken plastic parts and sometimes needs multiple switch on and off cycles to get it into the self cal mode before it can used. Could I enquire if you'd part with it at all?

Sent from my SM-J510FN using Tapatalk

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Offline djos

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2767 on: October 13, 2017, 09:14:21 PM »
Oh man, pics like that make me wanna cry!  |O

Your sir, are a Lucky lucky boy!  :clap:
The impossible often has a kind of integrity which the merely improbable lacks.
 

Offline razberik

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2768 on: October 13, 2017, 09:22:28 PM »
Thats the most ecologic way of recycling items !
 

Offline lowimpedance

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2769 on: October 13, 2017, 09:27:51 PM »
 :wtf: Holy cow, lucky bugga indeed, HP3458 as well  :o.
For me this would only happens in my dreams  :P

Enjoy fixing that lot.......please post some tales in the repair thread.

ps. don't let a single piece of gear hit the bottom of that dumpster  :D
« Last Edit: October 13, 2017, 09:31:01 PM by lowimpedance »
You call that current ?.......
I'll show you current !
 the odd multimeter or 2 or 3 or 4...or........never mind
 

Online Echo88

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2770 on: October 13, 2017, 10:38:34 PM »
3458A thrown in the dumpster, unbelievable.  :wtf:

 

Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2771 on: October 13, 2017, 11:02:59 PM »
It had too many numbers for the bean counters :)
 

Offline zucca

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2772 on: October 14, 2017, 01:33:47 AM »
3458A! TEA TEA TEA TEA
Can't know what you don't love. St. Augustine
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Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2773 on: October 14, 2017, 02:42:37 AM »
So, here's my first posting (hope I don't make any mistake).

My company is relocating and therefor filling the dumpsters with older TE that has accrued over several years and is defective or no longer in use.
Of course I'm not a TEA, but how could I just stand there and throw all this equipment out? So I asked and got permission to take what I want.  Needless to say, in no time I had a huge pile of stuff.  ;)

You are in serious danger of TEA; it is an easy slope down to damnation and degradation.

But never fear, we are here to help. But to be of most help, I need to know where in Germany you are located; the further north and west you are, the more help I can be.

P.S. you did make one mistake: not sending a PM to me a week before you announced this to the group.
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 bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #2774 on: October 14, 2017, 02:46:50 AM »
Ero-Shan's house in a few days:

 


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