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DL3021 to DL3031 Conversion Discussion

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Pedrofabian:
Installing the missing MOSFETs and control circuitry seems pretty involved but fairly easy.

Now if only we had calibration documentation for these loads.

Pedrofabian:

--- Quote from: electr_peter on February 15, 2022, 03:34:18 pm ---
--- Quote from: tv84 on February 14, 2022, 09:35:29 pm ---What about DL3051?

--- End quote ---
Tested DL3051A option. Model number changes (*IDN? -> RIGOL TECHNOLOGIES,DL3051A,DL...........,00.01.05.00.01)
On boot it shows error "Self-test error for OCP reference voltag" (after canceling error doesn't reappear until next boot).
Current ranges changed to 9/90A (compared to 4/40A or 6/60A), but max current limit remains unchanged at 70A (same as for DL3021/3031).

Max power setting increases to 500W (compared to 200 or 350W).
Other than that, seems to work, accuracy and functions remain unchanged.

So full mod to 150V/90A/500W DL3051A would require some work with FW (OCP reference?, max current limit) and HW (MOSFETs and driving circuitry).

--- End quote ---

Did you try resetting the settings again after changing the model? Maybe that would fix the max current limit issue

tv84:

--- Quote from: electr_peter on February 15, 2022, 03:34:18 pm ---Tested DL3051A option. Model number changes (*IDN? -> RIGOL TECHNOLOGIES,DL3051A,DL...........,00.01.05.00.01)
On boot it shows error "Self-test error for OCP reference voltag" (after canceling error doesn't reappear until next boot).
Current ranges changed to 9/90A (compared to 4/40A or 6/60A), but max current limit remains unchanged at 70A (same as for DL3021/3031).
Max power setting increases to 500W (compared to 200 or 350W).
Other than that, seems to work, accuracy and functions remain unchanged.

So full mod to 150V/90A/500W DL3051A would require some work with FW (OCP reference?, max current limit) and HW (MOSFETs and driving circuitry).

--- End quote ---

 :clap:  Thanks for testing!

electr_peter:

--- Quote from: Wintel on February 15, 2022, 04:46:56 pm ---Can you get over 200W in CR mode with flashed DL3021 to DL3031A?

--- End quote ---
Modded DL3031A can get over 200W in CR mode. Keep in mind that in lower 0.08 Ohm ~ 15 Ohm range voltage is limited to 8V (beeps and stops otherwise). Higher range (2 Ohm ~ 15 kOhm) does not have voltage limit.

electr_peter:

--- Quote from: Pedrofabian on February 15, 2022, 05:08:23 pm ---Did you try resetting the settings again after changing the model? Maybe that would fix the max current limit issue

--- End quote ---
Reset did not help, limit seems to be hardcoded in FW. Same 70A limit was available for 40/60A versions (i.e. no overlimit under normal conditions).

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