Products > Test Equipment
New entry-level R&S NGE100 Power Supply Series
Electronics404:
--- Quote from: exe on August 28, 2023, 03:33:37 pm ---Do you have an oscilloscope to check for oscillations? Which active load do you use?
--- End quote ---
I use this active load: https://www.tekbox.com/product/tboh02-self-powered-active-load/
But I don't think that it has anything to do with the issue, since I did the same exact test with my Siglent SPD3303X supply, which behaved just like you'd expect.
I also tried using a decade resistance box instead of the active load, just to be sure and rule out the active load as a potential error source.
It switches to CC mode at around 85mA, which I also confirmed with an external multimeter. So what the NGE is showing, are the correct voltage and current values.
But like I described in my last post, and can be seen in the video, the output is not constant. It jumps between CV and CC mode while the load current is between ~85mA and 100mA.
I also looked at the output with an oscilloscope, looks clean.
I've also had issues come and go after rebooting the device:
- I've had CH2 working correctly, but instead CH1 wouldn't switch to cc mode until around 40mA above the set current.
- I've had the device boot up, but none of the buttons worked.
exe:
Based on what you described, things don't look right to me. My internet is very bad, so I can't watch the videos you made. I hope R&S will resolve the issue. Please post here if there are new findings.
One speculation: if the unit has multiple current ranges, it might happen that the upper range is not very precise when used at the bottom of the range. I wonder if the unit still misbehaves at higher currents and if the 15mA offset (when CC triggers at 85mA instead of 100mA) is consistent. I.e., if you set current to, say, 500mA, will it trigger CC at 485mA?
PS the load looks cute to me, and I think I can recognize the parts it's built from. I must resist the temptation to buy one...
mhsprang:
I just purchased this power supply and the overshoot is still there. Set to 20V, 0.050A and loaded with 50 Ohm, the power supply still overshoots to 18V steady during 13 ms, after that the voltage drops exponentially to the expected 2.5V.
This behaviour could fry delicate circuits R&S!
thm_w:
--- Quote from: mhsprang on October 01, 2024, 02:22:24 pm ---I just purchased this power supply and the overshoot is still there. Set to 20V, 0.050A and loaded with 50 Ohm, the power supply still overshoots to 18V steady during 13 ms, after that the voltage drops exponentially to the expected 2.5V.
This behaviour could fry delicate circuits R&S!
--- End quote ---
Is this the NGE100 or 100B? The NGE100 is discontinued, so not sure where you bought it from.
If its the 100B then I was misinformed: https://www.eevblog.com/forum/testgear/power-supply-for-home-lab-do-i-really-need-a-rs/msg5488714/#msg5488714
mhsprang:
--- Quote from: thm_w on October 01, 2024, 10:31:19 pm ---Is this the NGE100 or 100B? The NGE100 is discontinued, so not sure where you bought it from.
If its the 100B then I was misinformed: https://www.eevblog.com/forum/testgear/power-supply-for-home-lab-do-i-really-need-a-rs/msg5488714/#msg5488714
--- End quote ---
It is the NGE103B, purchased from Farnell. It's updated to the latest firmware V1.58.
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