Negative output Voltage from a power supply?  - Page 1
Forum section: electronics / repair

author: MooCow27
author_rank: Newbie
timestamp: September 09, 2024, 05:33:14 pm
content: I have a variable 1kV DC power supply that I want to have as an up to -1kV output with respect to the positive rail tied to ground.The output currently goes out to a BNC which I tried to isolate from the grounded chassis.And ofc being very careful with the supply, recognizing the dangers.Any suggestions from this power supply, or general ideas on the key components?Thanks!

author: SteveThackery
author_rank: Super Contributor
timestamp: September 09, 2024, 06:50:52 pm
content: Out of interest, how much current will it deliver? I'm hoping you will live long enough to read all the replies!

author: MooCow27
author_rank: Newbie
timestamp: September 09, 2024, 07:00:22 pm
content: It can deliver up to 60 mA, but haha ofc being super careful. Letting things discharge, wearing thick gloves, checking voltages, etc.

author: wasedadoc
author_rank: Super Contributor
timestamp: September 09, 2024, 07:01:26 pm
content: Quote from: MooCow27 on September 09, 2024, 05:33:14 pmNot a good start making first post in wrong part of the forum. :-(

author: MooCow27
author_rank: Newbie
timestamp: September 09, 2024, 07:05:44 pm
content: Quote from: wasedadoc on September 09, 2024, 07:01:26 pmShould I move this elsewhere? I wasn't sure exactly where to put it?

author: SteveThackery
author_rank: Super Contributor
timestamp: September 10, 2024, 09:31:14 am
content: Quote from: MooCow27 on September 09, 2024, 07:05:44 pmWell, it clearly isn't a repair that you are doing. How about 'Beginners'?

author: tooki
author_rank: Super Contributor
timestamp: September 10, 2024, 06:54:01 pm
content: Quote from: MooCow27 on September 09, 2024, 05:33:14 pmI can’t say whether that supply is safe to reverse the polarity on.But what I would highly recommend is to replace the BNC with an MHV jack instead — that’s the medium high voltage variant of BNC (longer insulation, etc), or even SHV (safe high voltage), another BNC variant.(MHV and BNC can be forced to mate, with some damage to the MHV resulting. SHV cannot be forced.)

author: TimFox
author_rank: Super Contributor
timestamp: September 10, 2024, 07:28:55 pm
content: Don't!Those supplies from Acopian are factory-wired for either positive or negative output voltage: the "P" prefix denotes positive.See Acopian link in my reply below.They supply either the module, or the module mounted in a rack-mount housing with meters.At the beginning of the instructions, note "The high voltage output return, signal ground, programming ground and case ground are common and internally connected."

author: coromonadalix
author_rank: Super Contributor
timestamp: September 10, 2024, 07:31:26 pm
content: well tim you link the pdf to your machine it seems .....

author: TimFox
author_rank: Super Contributor
timestamp: September 10, 2024, 07:35:31 pm
content: Oops.Tryhttps://www.acopian.com/pdf/Acopian-High-Voltage-AC-DC-DC-DC-Modular-Rack-Mounting-Power-Supply.pdfMy "Don't" is mandatory: the negative end of this supply is connected to the metal case and the various signal and control grounds.It can be ordered with a negative output instead of the positive output that he has.I edited my reply to delete the link to the downloaded file.