Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 14552897 times)

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Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39225 on: September 19, 2019, 06:32:29 pm »
The B&K 3010 physical restoration is complete. Case painted and front panel cleaned. Will now go into the repair cue.

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Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39226 on: September 19, 2019, 07:11:40 pm »
Likewise the B&K 1801 painted and front panel cleaned. Also calibrated so this one is complete.

An old gray beard with an attitude.
 
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39227 on: September 19, 2019, 07:25:09 pm »
med at work  :-DD

 
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Offline xrunner

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39228 on: September 19, 2019, 07:27:17 pm »
 :-DD Oh that was mean!  :-DD
I told my friends I could teach them to be funny, but they all just laughed at me.
 

Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39229 on: September 19, 2019, 07:27:45 pm »
 :wtf: :-DD :-DD
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39230 on: September 19, 2019, 07:32:50 pm »
I joke - seriously speaking, it's a nice job and I rather like it :-+ :-DD

That was an excerpt from children's TV Saturday morning circa 2003. One of the few things I watched.

Some more joy:

 

Offline SoundTech-LG

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39231 on: September 19, 2019, 08:22:00 pm »
$230 dollars for that puppy in 1975, and it didn't even have the nice paint job!
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39232 on: September 19, 2019, 08:28:17 pm »
That was pretty cheap then. LED displays had just dropped, 74 series was still expensive.

 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39233 on: September 19, 2019, 09:01:03 pm »
So.....fixed the battery problem. Now have 6 volts to the board. The TI-95 came up said "Memory Cleared" and then died. Completely dead. Went down in a blaze of glory.

Oh well.  :-// :-DD

Yegads... hardcore Coppertopinoma!!!

Try pulling the memory module. Those things were notorious for that expansion slot being flaky; long before Nintendo. ;)

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Offline Kosmic

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39234 on: September 20, 2019, 01:44:55 am »
Sometimes ago I realized I could only measure resistance to about 1-2 GOhm with my best multimeter. This was completely unacceptable and I decided to correct the situation. I looked quickly at the cheap insulation tester from China but decided against it, because of the limited range and accuracy. I ended up finding something a lot better but also heavier :)

Got myself a General Radio 1644a. At the core, this is a self-contained wheatstone bridge designed to measure high value resistors. I can now measure up to a Peta Ohm (1000 Tera Ohm)  :-DD The device can also be used for insulation testing and test capacitor for leakage.




The interesting part about the Genrad 1644a is the self-calibration feature. You don't need super expensive equipment to calibrate and adjust the instrument. I serviced the instrument according to the manual and everything is now in specs. The main rheostat is quite impressive and can be adjusted with its 8 adjustment screws.



Measuring a Ohmite 200 GOhm 5%. Was reading 205 GOhm on the 1644  :)


« Last Edit: September 20, 2019, 03:37:16 am by Kosmic »
 
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Offline worsthorse

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39235 on: September 20, 2019, 02:00:29 am »
Sometimes ago I realized I could only measure resistance to about 1-2 GOhms with my best multimeter. This was completely unacceptable and I decided to correct the situation. I looked quickly at the cheap insulation tester from China but decided against it, because of the limited range and accuracy. I ended up finding something a lot better but also heavier :)

Got myself a General Radio 1644a. At the core, this is a self-contained wheatstone bridge designed to measure high value resistor. I can now measure up to a Peta Ohm (1000 Tera Ohm)  :-DD The device can also be used for insulation testing and test capacitor for leakage.


If you are going to go boat anchor, specialty boat anchor is the way to go. That box is in awesome shape.  Nice acquisition!   :clap:
specialization is for insects.
 
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Offline worsthorse

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39236 on: September 20, 2019, 02:06:37 am »
Worked on the 3400A tonight. Powers up. Reads correctly on the .1 to 3V scales, doesn't do so well on the others. A lot of erratic meter movement. I just printed schematics for it, so I don't know much but I am wondering if one or both of the thermocouples has been fried... has anyone here tested the thermocouples on one of these?

That's the first question. The second is, does anyone have a parts mule? I need to replace the plug socket and fuse holder (worst case) or the whole back panel assembly (best case).  The plug socket is the old oval shape, so a back panel assembly with a modern plug socket would be ideal. PM me if you have something I might be able to use.

specialization is for insects.
 

Offline Kosmic

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39237 on: September 20, 2019, 02:43:34 am »
Sometimes ago I realized I could only measure resistance to about 1-2 GOhms with my best multimeter. This was completely unacceptable and I decided to correct the situation. I looked quickly at the cheap insulation tester from China but decided against it, because of the limited range and accuracy. I ended up finding something a lot better but also heavier :)

Got myself a General Radio 1644a. At the core, this is a self-contained wheatstone bridge designed to measure high value resistor. I can now measure up to a Peta Ohm (1000 Tera Ohm)  :-DD The device can also be used for insulation testing and test capacitor for leakage.


If you are going to go boat anchor, specialty boat anchor is the way to go. That box is in awesome shape.  Nice acquisition!   :clap:

It's a boat anchor but still hold it's ground spec wise. Iet labs sell updated version of the 1644 and for some reason specs are worst  :-// The general accuracy of the 1644 is 1% and Iet labs 1864/1864 are 3%.

Got newfound respect for Genrad. Build quality is impressive. All the electrolytic are still in good shape  ^-^
 

Offline BravoV

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39238 on: September 20, 2019, 02:47:17 am »
$230 dollars for that puppy in 1975, and it didn't even have the nice paint job!

From the inflation calculator, the price is equivalent to $1097.  :o

Offline Kosmic

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39239 on: September 20, 2019, 03:14:56 am »
One of those Russian glass resistor. 1 TeraOhm 10%. was measured at around 0.92 TeraOhm.



 
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Offline xrunner

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39240 on: September 20, 2019, 03:20:43 am »
Wow.

Do you know what material they used to achieve that value of resistance?  :-//
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Offline Kosmic

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39241 on: September 20, 2019, 03:30:19 am »
Wow.

Do you know what material they used to achieve that value of resistance?  :-//

Carbon film I would guess. But I have no idea really.
 

Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39242 on: September 20, 2019, 06:29:29 am »
Sometimes ago I realized I could only measure resistance to about 1-2 GOhm with my best multimeter. This was completely unacceptable and I decided to correct the situation. I looked quickly at the cheap insulation tester from China but decided against it, because of the limited range and accuracy. I ended up finding something a lot better but also heavier :)

Got myself a General Radio 1644a. At the core, this is a self-contained wheatstone bridge designed to measure high value resistors. I can now measure up to a Peta Ohm (1000 Tera Ohm)  :-DD The device can also be used for insulation testing and test capacitor for leakage.

...

One of those Russian glass resistor. 1 TeraOhm 10%. was measured at around 0.92 TeraOhm.

Tasty!

Does it also measure air humidity and fingerprint conductivity?

Are you going to be going down the PTFE wire insulation route now?
There are lies, damned lies, statistics - and ADC/DAC specs.
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39243 on: September 20, 2019, 06:50:22 am »
Don’t forget finger cots (I hate those bloody things)
 

Offline paschulke2

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39244 on: September 20, 2019, 06:52:34 am »
Worked on the 3400A tonight. Powers up. Reads correctly on the .1 to 3V scales, doesn't do so well on the others. A lot of erratic meter movement. I just printed schematics for it, so I don't know much but I am wondering if one or both of the thermocouples has been fried... has anyone here tested the thermocouples on one of these?

If it works in one range, there's most likely nothing wrong with the video amplifier, the chopper amp and the thermo couple. Your problem is most likely a dirty range switch—simply clean it. And: Please don't mess with the thermo couple!

I need to replace the plug socket and fuse holder (worst case) or the whole back panel assembly (best case).  The plug socket is the old oval shape, so a back panel assembly with a modern plug socket would be ideal. PM me if you have something I might be able to use.

The fuse holder should be (more or less) a standard part. With a bit of metal work (not too hard because it's aluminum) it should be possible to retrofit an IEC plug.

- Thomas

PS: Please don't mess with the thermo couple!
 

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39245 on: September 20, 2019, 07:19:41 am »
I canceled Netflix, this TEA thread is what I need to relax.
Can't know what you don't love. St. Augustine
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Online beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39246 on: September 20, 2019, 08:01:17 am »
I canceled Netflix, this TEA thread is what I need to relax.

Got one of our local online ones wanting me to rejoin offering a 'free' month after I dumped them 3 or 4 months ago and AMAZON wants to sign me up after a 'free' month. None of the above at this stage ......
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 beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39247 on: September 20, 2019, 08:24:18 am »
Move fast USA mob eBay auction: #133167557354 cheep cheep  ;)
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 bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39248 on: September 20, 2019, 08:34:48 am »
Still got Netflix and TEA. How the hell else am I going to watch Star Trek on demand?  :-DD
 

Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39249 on: September 20, 2019, 08:39:53 am »
@Kosmic: This General Radio 1644A is looking nice!

I looked around ebay and found this, not cheap, though:   :scared:
It looks also very different than the one from Kosmic.  :-//

https://www.ebay.com/itm/200698733401

Seems, that taking good pictures is still kind of rocket science these days.  :--

« Last Edit: September 20, 2019, 09:53:04 am by BU508A »
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