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New miniature programmable DC power supply - FNIRSI DPS-150

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Aldo22:

--- Quote from: DaneLaw on October 18, 2024, 04:08:45 pm ---If low ripple/noise is fundamental for you, then you're purchasing the wrong products, by jumping on the cheapest switching-mode bench power supply China can muster (Longwei) alongside a tiny Fnirsi DPS-150 that clearly are optimised for mobility.

--- End quote ---

It's all good.
I definitely have a use for these devices.
I'm not complaining, I'm just noting (for others) that the DPS-150 has a certain amount of noise.
Not as bad as the Longwei, but definitely noticeable.
I don't regret the purchase.

DaneLaw:

--- Quote from: Aldo22 on October 18, 2024, 05:21:54 pm ---
--- Quote from: DaneLaw on October 18, 2024, 04:08:45 pm ---If low ripple/noise is fundamental for you, then you're purchasing the wrong products, by jumping on the cheapest switching-mode bench power supply China can muster (Longwei) alongside a tiny Fnirsi DPS-150 that clearly are optimised for mobility.

--- End quote ---

I'm not complaining, I'm just noting (for others) that the DPS-150 has a certain amount of noise.
Not as bad as the Longwei, but definitely noticeable.


--- End quote ---

The thing Im trying to highlight is the fact that the noise your showing in your pictures doesn't have to be from the DPS-150, as it's quite intense, could be third-party aspect that is introducing it.

According to your own pictures, when you're using the extremely noisy sub 50$ switch-mode Longwei bench supply, to run your DPS-150 you're gonna put a lot of noise into the DPS 150, same with many power sources.
https://www.eevblog.com/forum/testgear/new-miniature-programmable-dc-power-supply-fnirsi-dps-150/?action=dlattach;attach=2404921;image

Garbage in, garbage out.. its not gonna filter all that out.. its a tiny supply... also what is explained in the video with the timestamp I gave you.

Aldo22:
Hi


--- Quote from: DaneLaw on October 18, 2024, 08:28:06 pm ---The thing Im trying to highlight is the fact that the noise your showing in your pictures doesn't have to be from the DPS-150, as it's quite intense, could be third-party aspect that is introducing it.

--- End quote ---

No, I want to be fair to the DPS-150.  ;)
I only feed it with the output of the linear PSU.

The fourth picture above “dso2000_lin_peak.png” shows the “sine” of the XR2206 with the linear PSU at the input.
In the first picture “dso2000_dps150_peak.png” only the DPS-150 is connected in between. The DPS-150 gets the same input as the XR2206 in the other picture. No Longwei or other SMPS  are involved.
So I can say that the noise is probably coming from the Fnirsi.

But of course I set the oscilloscope, the probes and the amplitude of the XR2206 so that you can see the noise very clearly (No BW Limit, Probes 10x, Peak detect, low voltage...).
Nevertheless, “dso2000_lin_peak.png” and “dso2000_dps150_peak.png” were taken under exactly the same conditions.
The difference is real.

Aldo22:
Does anyone have information about the control protocol?
The PC program shows that it can be controlled remotely (USB).
But I would prefer to control it from Linux. A Python script/interface without GUI would be great.
Is there any information available?

Fungus:
If it's anything like previous models it'll be a serial port with CH340 chip inside it.

You could tap into the serial data and look at the protocol. I bet it's not complex.

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