Products > Test Equipment
New Keysight DC Power supply announced!
floobydust:
No, the backfeed can cause the damage and does blow up the crowbar, if enabled or it seems to be stupid and trip as if an UVLO. Or the pass transistor array etc.
While charging, pull the power cord as if a mains failure occured. Or with the power supply off, connect a battery to the output terminals. Many PSU's I've seen killed that way or worse as batteries can punch harder. Here we have a ton of firmware with devs not knowing about this issue.
I noticed press releases pulled a couple weeks ago, not sure what that is about :-//
I did see: E36155A USD $3,845 60V 40A, E36150ADVU USD $532
LaurentR:
The E36300 User Guide has a paragraph (see clipping below) about this (talking about OVP) where they recommend a diode to avoid backfeed and even putting the sense wire on the PSU side of the diode, which may make sense to keep sense and terminal within range but makes the sense input a lot less useful.
OTOH, the TTi QSP series, which is a hybrid very much like the Keysight supply of this thread (including the very similar and much cheaper QPX750SP mentioned above) claims:
"Output will withstand an applied forward voltage of up to 70V. Reverse protection by diode clamp for reverse currents up to 3A"
So it seems that that particular series of supplies can survive a battery backfeed.
I also looked at the Electro Automatik PSI 9000 DT Series (recommended as a high-power supply on this forum). The situation is not entirey clear. They have a section on battery charging. They clarify that they don't have reverse-polarity protection but they don't recommend an external diode for backfeed.
J-R:
https://www.mouser.com/c/power/power-supplies/bench-top-power-supplies/?m=Keysight&output%20current-channel%201=80%20A
HighVoltage:
Many many years ago, I killed a nice Agilent PSU, charging a battery.
The crowbar hit during a short mains power drop.
I learned all about crowbars then and was able to fix the PSU.
Be careful with any PSU, charging a battery and always apply a protection circuit!
tggzzz:
--- Quote from: EEVblog on September 16, 2022, 12:08:50 am ---
--- Quote from: nctnico on September 15, 2022, 09:42:13 pm ---Please stop polluting threads! That song is getting old.
--- End quote ---
Is this link spamming is happening on other Keysight threads?
--- End quote ---
Where someone suggests that individuals may be interested in a product but the company does not support individuals, I think a single warning is appropriate. That's similar to warning people not to use float scopes every time someone suggests doing that.
N.B. as someone that was very appreciative of HP support policies, and who worked happily for HP for 13 years and loves HP kit, the Keysight attitude pains me. I think it deserves to be mentioned when appropriate.
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