Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
BravoV:
Any comments or insights for HP 54701A probe ? Especially for those we've experienced using it. TIA
tautech:
--- Quote from: bd139 on May 25, 2018, 06:09:02 am ---
--- Quote from: tautech on May 24, 2018, 10:30:19 pm ---
--- Quote from: bd139 on May 24, 2018, 10:14:21 pm ---In lieu of bring it up slowly on the scariac, I decided that I couldn't be arsed to drag it out so I donned suitable PPE (ear protectors and goggles) and fired it up. No explosions!
--- End quote ---
As these have a linear PSU the good ol' dim bulb tester works fine on them with 100+W bulbs.
--- End quote ---
I really should build one of them. To be honest I’m not sure if you can get incandescent bulbs here.
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Of course you can and rightfully so:
https://uk.rs-online.com/web/c/lighting/incandescent-light-bulbs/gls-incandescent-light-bulbs/
This one of mine gives some idea of how you can quickly cobble something together with just stuff you have lying around.
bd139:
That’s quite a nice bit of reuse that :-+
Added to project list.
Berni:
--- Quote from: BravoV on May 25, 2018, 06:54:58 am ---Any comments or insights for HP 54701A probe ? Especially for those we've experienced using it. TIA
--- End quote ---
I have the new version of that probe that works with the Infiniium smart probe interface. I love these probes. They are great for any high speed work with there very low parasitic capacitance. Just keep it away from things with 24V power rails and such in them as the input is supposedly quite fragile
--- Quote from: bd139 on May 25, 2018, 08:09:03 am ---That’s quite a nice bit of reuse that :-+
Added to project list.
--- End quote ---
I need to make one too. So far i just use a 1:1 isolation transformer when testing these things. The short circuit current on it is 16A so it does prevent things from going bang in a spectacular way, but its still enugh current to make a good smoke generator if something shorts out. A extra bulb in series would be useful to limit it down in to the miliamps
tautech:
--- Quote from: bd139 on May 25, 2018, 08:09:03 am ---That’s quite a nice bit of reuse that :-+
Added to project list.
--- End quote ---
Initially I had it wired so when the switch was OFF the power was still passed through the bulb and ON switched in full mains current. Too risky I thought later and when doing SMPS you really need to fully isolate the bugger otherwise risk getting bit ! :scared:
So now OFF is off and ON is through the bulb. :phew:
Much safer !!!
You could add a master and get all the options you need if you can be bothered, I couldn't and when I'm gone and they're all cheering as they clean out my shed it'll just probably go in the skip they'll have to get to fit all my shit in.
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