| Products > Test Equipment |
| New DL24EW and DL150W load testers from Atorch. |
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| SpottedDick:
I'm aware we have the DL24(p) cheeseball thread, but this new unit from Atorch seems like such a radical redesign, I figured it deserved its own thread, especially since I can't find any proper reviews online of these modules yet. Ignoring things like the WiFi option, there's basically a colour screen version and monochrome screen version. Colour screen (DL24EW): https://www.aliexpress.com/item/1005004773128494.html Monochrome (DL150W): https://www.aliexpress.com/item/1005004682736656.html It's obvious from the listing photos that they've completely redesigned the circuitry. However what's more interesting and not shown in the listing (I got this from a review) is that they've now moved to 4 independent MOSFETs instead of one! This is in a very interesting arrangement that places the MOSFETs through the PCB. See below: Considering they've finally added a fuse, I wonder have they gone and fixed other issues like the ringing at the gate? Yes no more CPU coolers unfortunately folks, they've gone for a custom design this time. Not a bad thing if they've actually got it right! I can't see what the MOSFETs actually are, but considering they've stuck to 150W across 4, maybe they're actually being honest this time? Anyone thinking of purchasing one? |
| elecdonia:
--- Quote from: SpottedDick on January 12, 2023, 01:58:22 am ---I can't see what the MOSFETs actually are, but considering they've stuck to 150W across 4, maybe they're actually being honest this time? --- End quote --- I recently learned that some power MOSFETs are rated for “linear operation.” These have a well-defined “safe operating area” for voltage/current. In contrast most MOSFETs are intended for on/off switching only. Digikey’s search feature offers a selection parameter of “linear” which pulls up the most desirable MOSFET part numbers for applications like these linear electronic loads. Now I’m thinking of an alternate architecture for an electronic load: Wide range DC-DC buck/boost converter feeding a very large wattage load resistor. The load current gets adjusted by varying the output voltage of the DC-DC converter. This will dissipate most of the power in the resistor rather than directly into the MOSFETs. |
| Filippo52:
Yes I plan to buy one in the near future, I am currently reviewing the DL24MP, single element. I see both the color and monochrome models claim the same power but use different heatsinks. Those in the color model are double the height; how is it possible that this has no effect on power? in any case we are business as usual, there is always something badly sized and some bottle neck. What did it take to put bigger heatsinks? Once cultured, the DL24 burned out because a single mosfet not suitable for working in a linear way went up in smoke. Now they have put 4 mosfet that could also do something, but they have reduced the heat dissipation capacity of the heatsinks. Really strange. I wanted to try to put better heat sinks, perhaps in copper, but I saw that they are now prohibitively expensive. |
| thm_w:
--- Quote from: Filippo52 on January 31, 2023, 08:03:13 pm ---Those in the color model are double the height; how is it possible that this has no effect on power? --- End quote --- Because the spec they give is meaningless, it will never reach that level safely. I have one of the short heatsink style, older model, I believe it was capable of 60-70W at reasonable temperatures. The taller heatsinks might do a few watts more. --- Quote ---What did it take to put bigger heatsinks? Once cultured, the DL24 burned out because a single mosfet not suitable for working in a linear way went up in smoke. Now they have put 4 mosfet that could also do something, but they have reduced the heat dissipation capacity of the heatsinks. Really strange. --- End quote --- Yes 4 FETs, if they are genuine ones not fakes, will handle more power than single reliably. But that added more to the cost, so they probably cut back on the heatsink size. --- Quote ---I wanted to try to put better heat sinks, perhaps in copper, but I saw that they are now prohibitively expensive. --- End quote --- Look around for old graphics cards or computers for sale on your local marketplace. You can pull good heatsinks out of them. Should cost less than $20. Its just that the form factor this product comes in is not very friendly for modding or installing in an enclosure. |
| srsrus:
I bought this load. The thing is interesting. Unfortunately, I didn't have time to fully test it. It broke due to incorrect connection. At the moment I am corresponding with the manufacturer to restore the device. ;D |
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