Test Equipment Anonymous (TEA) group therapy thread

[nixiefreqq]

strange.  thought sure there would be an emoji for that.

could not find one.

[tggzzz]

Yeah it's rancid. There's a place near us called Man vs Food which is much better and delivers via Uber Eats

A potentially enlightening article of the (non)economics of food delivery... https://themargins.substack.com/p/doordash-and-pizza-arbitrage
... always presuming the stated facts are true.

[med6753]

strange.  thought sure there would be and emoji for that.

could not find one.

This will work. 

[jxjbsd]

Three of the four modules are damaged and under repair.

Nice setup you got there. If you manage to add a SG504, you are well set for scope calibrations.

Sg503 has been repaired. 502 waiting for a power supply regulator IC, tg501 has not yet started. Thank you for your advice. I have never paid attention to sg504 before. I need to understand

[Ero-Shan]

Thanks for the reminder. But if a RMS Value changes by 26 µV, the added voltage must surely be RMS, too?

That's why I conclude with essentially, "it's more complicated than that" because you need to evaluate the whole system to be precise about what noise is going to get through to your reading and how it is going to get through - e.g. on the HP3458A there's an analogue measurement path (rms converter) and the sampling converter path, there's ADC aperture times, actual filters, digital filters. The main noise in the reading is most probably going to be 1/f noise and it's going to be very dependent on the exact measurement system path and aperture/averaging times whether that noise is 'averaged' in an individual measurement (in which case it would show up as rms in that reading) or whether the readings are fast enough that the 1/f noise shows up as a peak-peak difference between readings or even disappears as 'not within measurement band' for the AC reading. Messy. My numbers were merely intended as a "back of fag packet" calculation to evaluate the hypothesis "Are those reading differences likely to be uncertainty due to noise?".

You're certainly right, things are (much) more complicated here. I probably should be glad that I do not have to analyze it. No, I am glad!

[AVGresponding]

strange.  thought sure there would be an emoji for that.

could not find one.

This site has a good selection, I can usually find what I want.





Though I prefer this:

[Specmaster]

strange.  thought sure there would be an emoji for that.

could not find one.

This site has a good selection, I can usually find what I want.





Though I prefer this:

Darn it, just went to register on the site and I get an error message.

[tonyalbus]

Whoohoo!

new edditions arrived ;-)    from our local ebay..

someone on this forum warned me about this behavure...

;-)  Tony

[med6753]

Yes, the bug has bitten you. 

That 8010A and 8000A look brand new. Much cleaner than mine. 

[tonyalbus]

Yes, the bug has bitten you. 

That 8010A and 8000A look brand new. Much cleaner than mine. 

It was a lucky find.......  you can see my old 8010A in the back, i had that one at least 20 years...  the font on the front is slighly deffrent... so it does not count as a double ;-)

[Specmaster]

@tonyalbus, they all look almost new, well done, the Phillips meter looks from what we can see as if you just took it out of the box. Be careful of the plastics on it, they get very brittle with age. I have had 2 of those and also one of those counters, nice haul.

[med6753]

Yes, the bug has bitten you. 

That 8010A and 8000A look brand new. Much cleaner than mine. 

It was a lucky find.......  you can see my old 8010A in the back, i had that one at least 20 years...  the font on the front is slighly deffrent... so it does not count as a double ;-)

Doubles don't matter. I have 2 - 8800A's. 

[xrunner]

Doubles don't matter. I have 2 - 8800A's. 

Doubles? I don't think any amount of an item matters in this group. 

Good snags Tony.

[tonyalbus]

Thanks guys!

Ah the 8800A are also very nice....

i feel right at home here   

Tony

[med6753]

Thanks guys!

Ah the 8800A are also very nice....

i feel right at home here   

Tony

Most certainly.

1 - 8010A, 1 -8600A, 1- 8050A, 1- 8000A, 1- 8505A, 2 - 8800A, 1 - 1900A, 1- 1912A, 1- 7260A

And that doesn't include a few parts units stashed in the TEA closet. 

[med6753]

Today's mission: Get the Type 561B powered up.

I've replaced all the burnt components on the PSU board. I need to check the TO-3 regulator and if indeed hosed replace it. Then reinstall the board, making sure ALL wiring is correct. Then hit the power.

If you hear a scream and see smoke later call the EMT's.     

[tonyalbus]

Not to bad,
only the 8000A is a bit off

12.08
12.085
12.06
12.09 sometimes 12.08
12.086

[tonyalbus]

Today's mission: Get the Type 561B powered up.

I've replaced all the burnt components on the PSU board. I need to check the TO-3 regulator and if indeed hosed replace it. Then reinstall the board, making sure ALL wiring is correct. Then hit the power.

If you hear a scream and see smoke later call the EMT's. 

Exciting! ... wish you good luck.... don't burn it, you need to start allover... i ask murphy over for a coffie at my place..

[Cubdriver]

Yes, the bug has bitten you. 

That 8010A and 8000A look brand new. Much cleaner than mine. 

It was a lucky find.......  you can see my old 8010A in the back, i had that one at least 20 years...  the font on the front is slighly deffrent... so it does not count as a double ;-)

Hell, I bought an HP 5245L a few years ago because the display said "cps" and my other one was newer and marked in Hz.

-Pat

[Cubdriver]

Today's mission: Get the Type 561B powered up.

I've replaced all the burnt components on the PSU board. I need to check the TO-3 regulator and if indeed hosed replace it. Then reinstall the board, making sure ALL wiring is correct. Then hit the power.

If you hear a scream and see smoke later call the EMT's. 

Good luck, Mike - I'll keep my fingers crossed. 

I'm going to head in and join the skeleton crew at the radio museum for the first time since before my last CA trip in March.  I got home just as this insanity really blew up and everything shut down.  Catch y'all later, and will try to remember the Discord get together later on.

-Pat

[Mr. Scram]

A potentially enlightening article of the (non)economics of food delivery... https://themargins.substack.com/p/doordash-and-pizza-arbitrage
... always presuming the stated facts are true.

I know this is how finance works but it still makes my skin crawl.

[tonyalbus]

Happy man here.... even de new TTi TF930 agrees with the 'new' old meteor.
can't wait to receive the GPSDO 10Mhz to have a lab. reference, then this is all history..

[tonyalbus]

sorry bout the big picture... just finding out the settings ...

[xrunner]

sorry bout the big picture... just finding out the settings ...

Keep the pics coming ...

[med6753]

Not to bad,
only the 8000A is a bit off

12.08
12.085
12.06
12.09 sometimes 12.08
12.086

8000A's are drifty and the reason is that Fluke went with an unregulated +5V supply. If that 8000A doesn't have the battery option there is a fix. You'll need to install an additional small power transformer because the original can't provide the voltage headroom for a 7805 chip to regulate. I also upgraded the +/- 15V supplies with modern IC's.