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New miniature programmable DC power supply - FNIRSI DPS-150

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ptluis:

--- Quote from: Aldo22 on September 26, 2024, 09:43:55 pm ---
--- Quote from: ptluis on September 26, 2024, 08:47:58 pm ---Did you tried RISE instead of peak detect?

--- End quote ---

Hi

I don't know what RISE is.
My cheap scope has the acq. modes: Normal - Hi-Res - Peak - Average.

Thank you.

--- End quote ---

My mistake sorry,

Aquisition mode I use normal instead of peak

Trigger type I use Edge and slope Rise

After you check for ripple at no load, apply some load at output and watch the real ripple of the ps when stressed

Aldo22:
@ptluis
It depends on whether you don't want to miss a spike (Peak detect).
For ripple measurement, Hi-Res is probably the best for my scope.

I'll check with load later.

Thank you.

ptluis:

--- Quote from: Aldo22 on September 27, 2024, 08:36:17 am ---@ptluis
It depends on whether you don't want to miss a spike (Peak detect).
For ripple measurement, Hi-Res is probably the best for my scope.

I'll check with load later.

Thank you.

--- End quote ---

Well you should try and see what option gives you the best results, but in ripple measurements were not looking for spikes. that's my 2 cets

Aldo22:

--- Quote from: ptluis on September 27, 2024, 10:24:00 am ---Well you should try and see what option gives you the best results, but in ripple measurements were not looking for spikes. that's my 2 cets

--- End quote ---

I understand that this is a good way to measure ripple.
But actually the higher frequency noise of my (other) SMPS bothers me even more...
It's not that easy: https://www.4niev.com/switching-power-supply-noise/  ;)

But in any case, my self-built PSU hasn't shown any worrying interference in any range so far.  :-+
And to get back on topic, I think it would be a good source for the DPS-150 (for low power applications).

ptluis:

--- Quote from: Aldo22 on September 27, 2024, 10:50:32 am ---
--- Quote from: ptluis on September 27, 2024, 10:24:00 am ---Well you should try and see what option gives you the best results, but in ripple measurements were not looking for spikes. that's my 2 cets

--- End quote ---

I understand that this is a good way to measure ripple.
But actually the higher frequency noise of my (other) SMPS bothers me even more...
It's not that easy: https://www.4niev.com/switching-power-supply-noise/  ;)

But in any case, my self-built PSU hasn't shown any worrying interference in any range so far.  :-+
And to get back on topic, I think it would be a good source for the DPS-150 (for low power applications).

--- End quote ---

Your self made psu operates differently from  smps  (switch mode power supply) so the smps always show spikes, some show higher spikes other less, depending on the quality of the filtering, with aquire mode set to peak, your calculated pk to pk value is higher meaning ripple measured will not be real.

The dps-150 is a dc-dc buck converter that also produce spikes although at lower values and in this case it's possible to even decrease them to lower values by using a ceramic capacitor with low esr at the output, the low esr is the key.

If you don't want any ps noise on your dut you should power it using batteries as source of power, and use analog voltage regulators like the 7812 for eg. Also in audio electronics a clean PS is preferable.

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