Products > Test Equipment
HP/Keysight 66311B magnetic field leakage
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electronomicon:

--- Quote from: Hydron on December 02, 2023, 01:18:15 pm ---Does the 34401A not also have a 240V line voltage setting? Or was that not enough to fix the issue? Glad the suggestion helped with the other unit.

--- End quote ---
It does, but other than my 33120A it was already set to 240 V. So for both devices, setting them to 240 V line voltage helped but didn’t fully resolve the issue.
Gulftown:

--- Quote from: Hydron on December 02, 2023, 01:13:45 pm ---
--- Quote from: Gulftown on December 01, 2023, 11:27:31 am ---Okay I found a solution I think.
I will use a 230V/24V transformer and use it as an bucking transformer to reduce the input voltage on the primary of the original transformer.
That should work without introducing side effects.
I will keep you updated.

--- End quote ---
Bucking transformer is indeed the right way to go if you need to drop mains voltage a little. If you do it in the configuration shown in Fig. 4 here then you also avoid saturation issues on the bucking transformer: https://sound-au.com/articles/buck-xfmr.htm

I would test by dropping the voltage a bit with a variac first though to be sure it's actually going to solve the issue before spending the time and money wiring up the bucking transformer.

--- End quote ---

Thanks for the suggestion, i already hacked together a classic bucking transformer using tranformer from an old ac/ac wall plug, but i think that i dont have any saturation effects in the bucking transformer itself.

The output of the bucking transformer is now 206V RMS.
When i bould a proper 3d printed housing for the transformer i will change the circuit to the one you suggested.

The effect on the TDS 460A is now barely noticable and ob my Tek 2230 the screen is completely stable.
I will add some mu-metal anyway, because i already ordered it.
But i think the bucking transformer is the best solution.
electronomicon:
Can someone give me a hint where to get something like that ready to use? Or what to look for?

I read through the link @Hydron provided and I’m definitely not knowledgeable enough about AC stuff to start fiddling around with something here myself (like, if someone would point me to a transformer that’s safe to use and does the job, I could safely put it to use, but I don’t know enough to find the right transformer myself).

I tried to search the web, but didn’t really find anything useful.
coppercone2:
a good UPS might do it too if you want a integrated solution. they have taps to reduce voltage.
Gulftown:

--- Quote from: electronomicon on December 02, 2023, 05:19:32 pm ---Can someone give me a hint where to get something like that ready to use? Or what to look for?

I read through the link @Hydron provided and I’m definitely not knowledgeable enough about AC stuff to start fiddling around with something here myself (like, if someone would point me to a transformer that’s safe to use and does the job, I could safely put it to use, but I don’t know enough to find the right transformer myself).

I tried to search the web, but didn’t really find anything useful.

--- End quote ---

A Variac is a proper solution, while a litte bit more expensive, it is the safest and easiest option i think.

Europe:
https://www.ebay.de/itm/134252519871?mkevt=1&mkcid=1&mkrid=707-53477-19255-0&campid=5338748320&toolid=20006&customid=atk-lfgaAAAAjAnwk3FSYi32B_0cAAAAAA
USA:
https://www.ebay.com/itm/221484094745?hash=item33917b1519:g:EZMAAOSwj0NUf1NI&amdata=enc%3AAQAIAAAA0AN6wNHZ%2BLD7yqCDPrjrkp8k3lqkc0pzIdCSD%2BtzRFX0lyGcvZTtj1EP1ADM5W5kZGdRa4swMHiLJYEG9VQa0YOFOCsGmYVeg83m0BOBcJagI5NOzvZqMwyhj5zvjko0SeHAMkOou%2FobqQTw2b9E9fVD9ME4QFzpVBtPmJlvIJi3T5omVE4xMUySBzdj74k33ALKdUJBtxHwWKXWWcYdhlMoXJakurblLUMcZash4xiV0Xtbtd6RNV5sV2E%2FoQOstbajjqQ78BRwxjIUTHuPM28%3D%7Ctkp%3ABFBMxOuBuoVj

this is essentialy a variable version of my hacked bucking transformer.
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