Products > Test Equipment
SPD3303X Hiccup
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ebastler:

--- Quote from: mawyatt on August 19, 2024, 01:36:37 am ---
--- Quote from: Kean on August 18, 2024, 11:39:26 pm ---It would be good to fix the product code in the subject - it should be SPD3303X  not SDP3303X

--- End quote ---

Get this mixed up all the time [...]

--- End quote ---

I think it's an acronym -- Siglent Power Doohickey. At least that's how I remember it.  ;)
KungFuJosh:

--- Quote from: ebastler on August 20, 2024, 07:15:39 pm ---I think it's an acronym -- Siglent Power Doohickey. At least that's how I remember it.  ;)

--- End quote ---

100%! That's how they do all their acronyms. Like the Siglent Signal Gadget.
mawyatt:

--- Quote from: Sorama on August 20, 2024, 05:40:55 pm ---a quantitative measurement using IR won't be possible.
First you would have to determine the emission factor, secondly you're measuring a metal (the heatsink) which has a low emission and therefore hard to measure by IR.
A (qualitative) measurement with the same IR camera from the same angle would give a representative impression of the heat that is generated over there.

--- End quote ---

We know, thanks, should have said "compare temperature distribution", but more interested in how the components around this area are spread relative temperature-wise as this area is a "hot spot"!! Everything in the area seems heated up, and wonder if this is due to actual internal dissipation or just localized conducted heating.

We did "look" at the Black Anodized Heat Sink utilized with the cheap UT-260B IR Camera just for sanity check, used our MHP30 as a heat source just to "see" if things were in the ballpark.

Anyway, another "view" with a newer 3303 might help us understand!!

Best,
tautech:

--- Quote from: mawyatt on August 20, 2024, 02:59:36 pm ---Here's a thermal image of the Bridge Rectifier with heatsink and area around, things are very warm including the caps. However the one cap isn't bulging, it's just the angle of the image. The Max Temp is the T0-92 device (Regulator?).


After about 4~5 days, we haven't experienced a reset.
--- End quote ---
:-+

--- Quote ---Could someone with a new 3303 post a thermal image of this area to compare temperatures temperature distribution?
--- End quote ---
Rectifier stage has been reworked now Mike:



The only reason we've had to lift the covers on these PSU's are for bridge failures yet early units gave zero problems.
thm_w:

--- Quote from: Sorama on August 20, 2024, 05:40:55 pm ---a quantitative measurement using IR won't be possible.
First you would have to determine the emission factor, secondly you're measuring a metal (the heatsink) which has a low emission and therefore hard to measure by IR.
A (qualitative) measurement with the same IR camera from the same angle would give a representative impression of the heat that is generated over there.

--- End quote ---

Have you ever actually used an IR camera? Black anodized aluminum has an emissivity of 0.82-0.86. Which is fine. Even if it wasn't you can see the plastic package right underneath (would be around 0.9).

https://www.design1st.com/Design-Resource-Library/engineering_data/ThermalEmissivityValues.pdf
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