Products > Test Equipment
Keysight New instruments
Fungus:
--- Quote from: floobydust on March 01, 2021, 08:23:42 pm ---The old one nice in green, pop up headlights and all digital dash, flat switches. I actually like it when designers can go futuristic - have fun, create/innovate, think outside the corporate box. Steve Jobs did it as well.
--- End quote ---
Yep. Gotta love that interior. It's pure James Bond.
The outside looks like a very long Fiat X1/9:
(The Fiat was a few years earlier...)
Berni:
--- Quote from: HighVoltage on March 03, 2021, 09:10:33 am ---Many old Agilent and HP PSUs had this "feature" and many years ago I killed a brand new Agilent PSU, by charging a battery and the crow bar was activated.
The magic smoke appeared really fast and dark.
Since that time I am careful, every time I hook up a battery or large capacitor to a PSU.
--- End quote ---
Ouch so they indeed have a full on crowbar circuit that throws a dead short across the output once upset. :--
I will definitely be more careful with PSUs from now on then.
nfmax:
--- Quote from: Berni on March 03, 2021, 10:46:13 am ---
--- Quote from: HighVoltage on March 03, 2021, 09:10:33 am ---Many old Agilent and HP PSUs had this "feature" and many years ago I killed a brand new Agilent PSU, by charging a battery and the crow bar was activated.
The magic smoke appeared really fast and dark.
Since that time I am careful, every time I hook up a battery or large capacitor to a PSU.
--- End quote ---
Ouch so they indeed have a full on crowbar circuit that throws a dead short across the output once upset. :--
I will definitely be more careful with PSUs from now on then.
--- End quote ---
Most of the time (i.e. when not trying to charge a battery) such a crowbar is exactly what is needed!
SilverSolder:
Yes, a crowbar is a good thing (see Dave's video about how unpredictable fuses behave. Crowbars make them predictable!).
The problem is, why not make the output circuits immune to external voltages? Difference between men and boys! :D
floobydust:
I think a decent PSU doesn't need OVP, it's supposed to be reliable lol. Put the money into a beefier pass-transistor and heatsink or backfeed-diode.
But here we have firmware and memory leaks which the OVP might need to cover.
I can't easily tell if the new PSU can source/sink (push-pull) output. It's likely just a source-only.
Is it an SCR crowbar? Must be.
It's actually a bomb because charging a battery and power glitching or going out, the OVP trips and the battery then cooks the PSU with no fuses etc. on the O/P side. Easily start a fire in a facility.
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