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Test Equipment Anonymous (TEA) group therapy thread

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Vince:
What a small world !  ;D

EggertEnjoyer123:
Here's a HP 6675A I got from the garbage a month ago. I finally got around to testing it.

Powers on and works nicely. The equipment uses 220V, so I'm using two phases on a 110V outlet. Are there any potential safety issues with this setup? I made an "adapter" where the live and neutral of the power supply go to the two live connections of the sockets.

TERRA Operative:
A few things happening here in Japanland recently.

Finally got delivery of the custom foam inserts for the soft cases for my THS720 scopes.
I have two of the Tek soft cases and both had the typically rotten foam inserts, so I used 'mycasebuilder' to design a new insert with a couple tweaks for better use of the space.
They came up really nice.  8)

I have also mostly recreated the deluxe lead set using the original Mueller parts (details added to the THS720 tekwiki page) so I'm well on the way to having ALL the accessories. :)

Then I recapped my TDS540 scope and installed a brand new Dallas NVRAM sourced from Digikey (date coded this year!), but found that while almost all caps had barely leaked at all, the two on the little piggyback Voltage Controlled Oscillator board on the Acquisition board had leaked good and proper, destroying this PCB, but luckily not making it to the Acquisition board.
So, I designed a new VCO PCB in Diptrace which I'll order soon.
I think I'll have to clean up the existing transistors and varicap diode unless I can find equivalents as the original part numbers seem to be obsolete... :(

And finally, I'm well on the way to finishing my recreation of the 11683A HP Power Meter Calibrator, to get my HP 437B Power Meter all adjusted nice.
Lots of multiturn trimpots to get each range really dialled in accurately so the power meter will be adjusted as spot-on as possible.

vk6zgo:

--- Quote from: EggertEnjoyer123 on June 07, 2023, 02:50:48 am ---Here's a HP 6675A I got from the garbage a month ago. I finally got around to testing it.

Powers on and works nicely. The equipment uses 220V, so I'm using two phases on a 110V outlet. Are there any potential safety issues with this setup? I made an "adapter" where the live and neutral of the power supply go to the two live connections of the sockets.

--- End quote ---

Quite a number of US hams, who want to get full legal power out of their linear amplifiers run them at 240v in a similar manner, but it is a bit "frowned on" & they are often urged on QRZ.com & suchlike forums to get a proper dedicated 240v power outlet fitted.

AVGresponding:

--- Quote from: EggertEnjoyer123 on June 07, 2023, 02:50:48 am ---Here's a HP 6675A I got from the garbage a month ago. I finally got around to testing it.

Powers on and works nicely. The equipment uses 220V, so I'm using two phases on a 110V outlet. Are there any potential safety issues with this setup? I made an "adapter" where the live and neutral of the power supply go to the two live connections of the sockets.

--- End quote ---

The main safety issue is you can't do that with GFCI protected circuits, so make sure you use a plug-in GFCI (240V!) between the power outlet and the TE.

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