Products > Test Equipment

High Voltage DC Benchtop Power Supply

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pdenisowski:
I'd just like to second what several others have said about safety:  our NGP800 power supply can generate up to 800W and it's very easy to create lethal voltages / currents. The attached picture (where I'm using an automotive battery tester as a 40A, ~20V load) is definitely NOT something you should try at home. 

RoGeorge:
Beware of those banana plug to alligator wires, in case they were a cheap buy.

Saying that because those cables look like the ones I have, ordered from Aliexpress long ago, and mine are not using copper wires!  Therefore, anything about 1A starts to heat them.  At 3A, mine are almost hot enough to melt the isolation.  At 10A I guess those wires of mine would be a fire hazard, but I never tested them above 3A.

pdenisowski:

--- Quote from: RoGeorge on June 23, 2022, 06:17:30 am ---Beware of those banana plug to alligator wires, in case they were a cheap buy.

Saying that because those cables look like the ones I have, ordered from Aliexpress long ago, and mine are not using copper wires!  Therefore, anything about 1A starts to heat them.  At 3A, mine are almost hot enough to melt the isolation.  At 10A I guess those wires of mine would be a fire hazard, but I never tested them above 3A.

--- End quote ---

I think I got those from Amazon, but they were definitely very, very cheap.  The automotive battery tester is only supposed to be used for a few seconds at a time (it has a spring-loaded switch so you have to hold it down to keep the circuit closed), but even that was enough to start heating them up.  After a few tests, they were uncomfortably hot, and after a few more tests, I noticed that a couple of channels suddenly reverted to constant voltage mode because the leads became ... permanently... open.  So in a sense it was actually safer for me to use cheap leads, since they stopped conducting before they caught fire :)

I left all of the leads in a metal bucket of water, outside, for a while before throwing them away. 

Cubdriver:

--- Quote from: pdenisowski on June 23, 2022, 09:34:52 am ---
--- Quote from: RoGeorge on June 23, 2022, 06:17:30 am ---Beware of those banana plug to alligator wires, in case they were a cheap buy.

Saying that because those cables look like the ones I have, ordered from Aliexpress long ago, and mine are not using copper wires!  Therefore, anything about 1A starts to heat them.  At 3A, mine are almost hot enough to melt the isolation.  At 10A I guess those wires of mine would be a fire hazard, but I never tested them above 3A.

--- End quote ---

I think I got those from Amazon, but they were definitely very, very cheap.  The automotive battery tester is only supposed to be used for a few seconds at a time (it has a spring-loaded switch so you have to hold it down to keep the circuit closed), but even that was enough to start heating them up.  After a few tests, they were uncomfortably hot, and after a few more tests, I noticed that a couple of channels suddenly reverted to constant voltage mode because the leads became ... permanently... open.  So in a sense it was actually safer for me to use cheap leads, since they stopped conducting before they caught fire :)

I left all of the leads in a metal bucket of water, outside, for a while before throwing them away.

--- End quote ---

Test leads that double as fuses - genius! /s

That is a hell of a sweet looking power supply, but I suspect waaaay out of my price range.  R&S makes some nice gear.   :-+

-Pat

pdenisowski:

--- Quote from: Cubdriver on June 25, 2022, 12:28:26 am ---That is a hell of a sweet looking power supply, but I suspect waaaay out of my price range.  R&S makes some nice gear.

--- End quote ---

The NGP is a very popular supply, but it isn’t really priced for hobbyists.

I recently developed a series of power supply technology and “how to” videos for each of the R&S power supplies, and now it’s kind of hard for me to go back to using my personally-owned supplies :)

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