Products > Test Equipment

Test Equipment Anonymous (TEA) group therapy thread

<< < (2543/27437) > >>

bd139:

--- Quote from: zucca on July 02, 2018, 12:56:30 pm ---bd139 if you want to make me happy please teardown the PS-900 unit.
Thanks. Now my TEA disease escalated in a battery powered Metcal unit and I need to see how the circuit look like.

Of course there is this:
https://www.eevblog.com/forum/projects/diy-metcal-13-56-mhz-rf-supply/

but I rather prefer to rip apart a PS-900...  >:D

if your reactions is this


I fully understand no worries.

--- End quote ---

It’s on the todo list already :)

The case of the base unit is a chunk of cast aluminium so should be interesting.

Specmaster:

--- Quote from: Cerebus on July 02, 2018, 12:32:24 pm ---
--- Quote from: Specmaster on July 02, 2018, 12:24:18 pm ---Would that be a Keithly 175 with red LEDS from Ebay by any chance, the one I was after[emoji48]

--- End quote ---

Oh, that was you bastards was it?  :)

I had my eye on that to sit next to its cousin, my brown Keithley 197.

--- End quote ---
Not me, I gave up at £30 it wasn't well presented and only 4.5 digits, I gave £35 for a 5.5 digit 8400A so it was out of my value range[emoji16]

From mobile device so predictive text might have struck again [emoji83]

tggzzz:

--- Quote from: bd139 on July 02, 2018, 11:33:54 am ---Nothing TEA related today although I shall have to do something as my WSPR transmitter blew up last night spontaneously. Think there was an antenna problem as the finals have gone to silicon heaven. Fortunately they're only BS170s and I bought a massive bag of them.

Really need to buy or build an antenna analyser. Oh there we go, back on TEA :D

--- End quote ---

Now you'll have to actually use the TE, cf talking about it :)

bd139:
Actually this thing has ridiculously useful TE built in. It's rudimentary but works very well for the purpose. Managed to test my theory about the dead PA MOSFETs with the built in DVM and RF power meter!

Turned out the problem was a dodgy BNC patch after the SO239/BNC adapter. Went open circuit intermittently allowing Vds to be somewhat exceeded.

Working now... and a welcome distraction from a less interesting problem to deal with.

mnementh:

--- Quote from: bd139 on July 02, 2018, 02:27:16 pm ---
--- Quote from: zucca on July 02, 2018, 12:56:30 pm ---bd139 if you want to make me happy please teardown the PS-900 unit.
Thanks. Now my TEA disease escalated in a battery powered Metcal unit and I need to see how the circuit look like.

Of course there is this:
https://www.eevblog.com/forum/projects/diy-metcal-13-56-mhz-rf-supply/

but I rather prefer to rip apart a PS-900...  >:D

if your reactions is this


I fully understand no worries.

--- End quote ---

It’s on the todo list already :)

The case of the base unit is a chunk of cast aluminium so should be interesting.

--- End quote ---


Here's a link to a .pdf of the technical reference one of our MetCal junkies put together himself via reverse-engineering and documentation distilled from the Patent Office notes on the MX-500: http://colinoflynn.com/wp-content/uploads/2012/05/MX-500P-11.pdf



--- Quote from: bd139 on July 02, 2018, 04:27:15 pm ---Actually this thing has ridiculously useful TE built in. It's rudimentary but works very well for the purpose. Managed to test my theory about the dead PA MOSFETs with the built in DVM and RF power meter!

Turned out the problem was a dodgy BNC patch after the SO239/BNC adapter. Went open circuit intermittently allowing Vds to be somewhat exceeded.

Working now... and a welcome distraction from a less interesting problem to deal with.



--- End quote ---


Must be your Penis Fingers repellent arrived today.  :-DD





In other news...

I found this stuff at my local Dollar Tree store; looks ve-e-e-ry useful to have around for 8 bits. I bought... several.  :-DD



mnem

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod