DCma 2D42 firmware 2020070701

pu6k1n

Hello! Maybe this will help you. I upgraded, as you said again, upgraded to version 2021010801, but the problem persists, DCma and ACma modes do not work! I return to the old firmware 2019082801, the DCma and ACma modes are working. I opened the device ((. Looked at the signals on optocouplers in DCma mode with firmware 2021010801, data goes from U4 (CS7721CN) through the TxD U5 (PC817) line! On the U9 (74HC595) chip, DCma mode is set (MEA1 = 0, MEA2 = 1, MEA3 = 1, MEA4 = 1, REL = 1, SELECT = 1, RST = 1), which corresponds to the CS7721CN documentation.For some reason, it can be seen that the firmware does not display data on the LCD in DCma mode. (((((((

amy

Please update again. And check whether there is any change.

OASJ2YSeeEhBQo1

Yes, I have exactly the same problem with my 2D42 as well. The DC mA range does not work with any of the 2020xxxxx fw version, I have to downgrade to some 2019 version for it to work.
This problem seems to affect just some devices (maybe an earlier HW revision?). I've already reported this problem to Hantek some time ago but I've never got a reply or a solution.