Products > Test Equipment
Power supply for home lab - do I really need a R&S?
KungFuJosh:
--- Quote from: mhsprang on October 14, 2024, 05:09:12 pm ---@KungFuJosh,
I agree about the lower current setting. I sort of started this by observing a huge overshoot on my R&S NGE103, which is now being investigated by R&S. That overshoot is happening at all currents below 140 mA and is always up to 140 mA.
So, maybe this NGA 142 is doing allright at 40 mA but behaving bad at 10 mA. Maybe @pdenisowski could repeat this test at 10 mA as well.
--- End quote ---
Uh oh, don't let R&S know my little Siglent PSU is behaving better than their PSU that costs 3 times as much. Or maybe that will get them to fix it faster. 😉😉
mhsprang:
--- Quote from: KungFuJosh on October 14, 2024, 05:23:14 pm ---Uh oh, don't let R&S know my little Siglent PSU is behaving better than their PSU that costs 3 times as much. Or maybe that will get them to fix it faster. 😉😉
--- End quote ---
They already know that ;D
pdenisowski:
--- Quote from: mhsprang on October 14, 2024, 05:09:12 pm ---So, maybe this NGA 142 is doing allright at 40 mA but behaving bad at 10 mA. Maybe @pdenisowski could repeat this test at 10 mA as well.
--- End quote ---
I'll have to borrow another NGA to test against, but the NGA is a purely linear power supply, so I expect something very similar.
salomonander:
Do these spikes in current mode only happen with number small number below 20-30mA? Or does it also happen when i limit it to say 60mA? Thanks
KungFuJosh:
--- Quote from: salomonander on October 16, 2024, 12:34:34 pm ---Do these spikes in current mode only happen with number small number below 20-30mA? Or does it also happen when i limit it to say 60mA? Thanks
--- End quote ---
That depends entirely on the brand/model of PSU. My Siglent SPD3303X only spikes up to ~29mA, so anything below that will see more current for a very short spike before dropping and then going up to the current setting. For anything over 30mA it doesn't matter since the spike hasn't ever gone above that in my tests.
Different brands have shown different results. Some much better, some much worse.
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