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Pico PSU (Power Supplies) the junk end

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Jeroen3:
Apparently the 5600g is more efficient. Not sure if this also applies to synthetic loads though... Fun how 2 years of new tech improves things.

DiTBho:
ummm, we should bench-test those PSUs with test loads before actually using them  :-//

nctnico:
You can't measure aluminium heatsinks like that with a thermal camera. Their surface is too shiny. You have to create a mat black spot (for example using masking tape which is made black using an ink pen) to measure the temperature accuratly.

Either way, these units are likely designed to have some airflow going over them as well.

T3sl4co1l:
No worry, plain masking tape is plenty black at thermal wavelengths. Even better, vinyl electrical tape!

Other tapes tend to do poorly: yellow transformer tape (polyester/acrylic?), or clear gold (polyimide), are typically too thin (fractional wavelength) so don't increase emissivity as much as you'd expect from their materials (which is the emissivity of bulk material).

Same goes for ink -- even a heavy mark (let dry and re-draw multiple times) from a permanent marker, while enough to be visible in thermal IR, still has quite low emissivity.  A nice thick layer from a paint, grease or wax pen(cil) does nicely, however.

You can also look for bright peaks -- occasionally you'll find an inside corner with total internal reflection, which therefore acts as an accidental black-body resonator, thus representing the actual temperature of the metal.  These are quite hard to spot / rare to find with low resolution consumer cameras, though.  (As I recall from a good industrial cam, philips screws and inside corners of heatsinks can occasionally do this.  But the spot size is quite small -- specular reflections basically.  To be more specific: the heatsink temperature is at least max(<pixels within the region of the heatsink>) -- but can still be more than that, because you still don't really know the emissivity of those brightest spots.)

Tim

beanflying:

--- Quote from: nctnico on May 25, 2023, 04:28:01 pm ---You can't
measure aluminium heatsinks like that with a thermal camera. Their surface is too shiny. You have to create a mat black spot (for example using masking tape which is made black using an ink pen) to measure the temperature accuratly.

Either way, these units are likely designed to have some airflow going over them as well.

--- End quote ---

Providing you correct for the emissivity you can use a thermal camera on Aluminium whichI did for those extra tagged points in the Fluke connect software. Can you get them +-1C doing that then NO but it is a whole lot closer and at this scale likely better than tape.

I will add some air outlets in this corner of the case to push a bit of air past them too based on this testing and tweaking and also reduce the ones at the bottom of the case as the NVMe now has a decent heatsink.



EDIT: Tweaked version attached, reduced VRM and NVMe cooling outlets and added some for the Pico

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