Products > Test Equipment
New miniature programmable DC power supply - FNIRSI DPS-150
Aldo22:
--- Quote from: ptluis on October 17, 2024, 11:58:42 pm ---First connect the cable to the input of the fnirsi, then power on the input power supply, battery, etc
--- End quote ---
Whenever possible, yes.
But not everything has a switch.
For example, the old laptop power supply (19V / 65W), which is actually quite suitable, does not have one.
Well, you can switch it on a socket strip...
It's not really a problem, just an observation.
Aldo22:
--- Quote from: DaneLaw on October 17, 2024, 08:33:27 pm ---It claims the ripple tolerances to be sub 20mV...
--- End quote ---
Thanks, I had seen that once.
But it looks to me more like it comes from the marketing department.
What does 20mV mean? mVpp?
I assume mVrms, which is not exactly low noise.
--- Quote from: DaneLaw on October 17, 2024, 08:33:27 pm ---...and the posted video above tries to highlight getting way below that..
--- End quote ---
I don't know what he's doing there.
Too fast, too blurred, too vertical, too Chinese... ;)
In addition, I now believe that when looking at or measuring spikes, it only makes sense to make comparisons with the same scope, method and setup.
Even with the same scope, you can get drastically different results depending on the acquisition method, memory depth, time scale, bandwidth limitation, etc.
So it only makes sense if you leave everything the same and then look at different PSUs.
RAPo:
To be more precise; you have to buy a yellow DPOX180H no other scope will do. (seeking cover now :-DD).
--- Quote from: Aldo22 on October 18, 2024, 08:59:43 am ---In addition, I now believe that when looking at or measuring spikes, it only makes sense to make comparisons with the same scope, method and setup.
Even with the same scope, you can get drastically different results depending on the acquisition method, memory depth, time scale, bandwidth limitation, etc.
So it only makes sense if you leave everything the same and then look at different PSUs.
--- End quote ---
DaneLaw:
--- Quote from: Aldo22 on October 18, 2024, 08:59:43 am ---
--- Quote from: DaneLaw on October 17, 2024, 08:33:27 pm ---It claims the ripple tolerances to be sub 20mV...
--- End quote ---
Thanks, I had seen that once.
But it looks to me more like it comes from the marketing department.
What does 20mV mean? mVpp?
I assume mVrms, which is not exactly low noise.
--- Quote from: DaneLaw on October 17, 2024, 08:33:27 pm ---...and the posted video above tries to highlight getting way below that..
--- End quote ---
I don't know what he's doing there.
Too fast, too blurred, too vertical, too Chinese... ;)
--- End quote ---
Usually peak to peak' but reach out and ask them.
they are one of the few that actually seem to have some customer support. (you got the link above)
sub 20mV ain't half bad and as highlighted..the fellow in the video, writes that he got 8mV so way below the 20mV
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.
Look instead for a linear bench supply.. they cost around the same, not much more.. 60 to 70 euro from brands like Korad, and from western resellers, but they are heavy as.
Got two myself. https://tinyurl.com/5n94yxjn
The noise I experienced in fx AlienTek DP100 is certainly not bad for an SMPS product of this size.
If I recall correctly, its pp-rated sub 10mV but only goes to 100W
If your unsure, on how to measure and don't screw up your measurement from bringing in third party noise, you can maybe get some hints from Dave's video, alongside something to compare against, where he tested the DP100.
From +27:30
Aldo22:
@RAPo
@DaneLaw
--- Quote from: RAPo on October 18, 2024, 02:56:35 pm ---To be more precise; you have to buy a yellow DPOX180H no other scope will do. (seeking cover now :-DD).
--- End quote ---
I don't think so. :-DD
Even with the cheapest desktop scope, you can control what you want to see much more than with the handhelds.
I don't have a DPOX, but I do have a Zeeweii.
Take a look: This is the same signal viewed with the Hantek. Once I want to see the noise (Peak Detect, "dso2000_dps150_peak.png" ) and once I only want to see the repetitive part of the signal (Average, "dso2000_dps150_avg.png").
I don't know the DPOX, but with the Zeeweii I only have one possibility ("zeeweii.png").
Again, this is all the same signal!
The signal generator is an XR2206, which is fed by the DPS-150.
If the XR2206 is fed with a linear PSU, it looks like in "dso2000_lin_peak.png" (Peak detect) and "dso2000_lin_hr.png" (High Res.).
So much less noise.
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