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DCma 2D42 firmware 2020070701

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Post time 2021-1-19 18:04:17 | Show all posts |Read mode
I have 2D42. FPGA_V07. Updated STM32 with official firmware from Hantek website 2020070701. Current measurement with a cartoon in DCma mode does not work, does not measure, and the point is shifted 1 digit to the left, and how can it measure a maximum of 200 mA? ((. On request 2020051401 the same thing, DCma mode does not work. I put the firmware back to 2019082801 and everything worked for the cartoon as it should. What should I do?
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Post time 2021-1-23 15:44:08 | Show all posts
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.

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Post time 2021-1-27 15:19:53 | Show all posts
Please update again. And check whether there is any change.

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 Author| Post time 2021-1-28 01:17:46 | Show all posts
Edited by pu6k1n at 2021-1-28 01:48

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. (((((((




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 Author| Post time 2021-1-28 02:44:46 | Show all posts
Edited by pu6k1n at 2021-1-28 04:02

I will also add. I tried to measure ma in DCma mode in the Hantek2xx2 program. The measured current jumps. Firmware 2021010801

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 Author| Post time 2021-1-28 03:58:18 | Show all posts
And like this with the firmware 2019082801

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Post time 2021-1-28 12:40:42 | Show all posts
Same problem here:
with 2019110801 or earlier FW:



and with 2021010801 or any other 2020xxxx FW:

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 Author| Post time 2021-1-28 15:57:30 | Show all posts
Yes, the same!

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Post time 2021-1-28 16:39:57 | Show all posts
Thanks for your feedback. Please give me the SN of your scope to my email caiyijun@hantek.com.

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Post time 2021-1-29 09:18:25 | Show all posts
amy replied at 2021-1-28 16:39
Thanks for your feedback. Please give me the SN of your scope to my email .

OK, I sent to your email the SN already.

Note that DC and AC mA ranges have the same problem.
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