Hantek 2C42 random pulses in roll mode

Equizer · Post time 2019-9-19 23:33:06

I recently got my Hantek 2C42 and found out that in Single trigger mode scope just randomly triggers on nothing, showing a flat 0 V line or a voltage spike.

Later i dicovered that it happens even if coupling is set to GND, so i tried to take a better look at what's happening using roll mode and saw distinct voltage spikes happening randomly.

And there is another problem in roll mode, when channel coupling is set to GND, channel trace lifts up independent of vertical scale. So, for example at 100 mV/Div trace lifts to 52 mV, at 1 V/Div trace lifts to 520 mV and so on.

But when AC or DC coupling is selected, trace stays near 0 V.

I would like to know why this is happening and how to fix it.
I assume this is due to errors in firmware and hope it will be fixed soon.

Equizer · Post time 2019-9-20 07:46:52

Edited by Equizer at 2019-9-20 07:49

Fixed random voltage spikes by downgrading FPGA software to V02, however traces are still lifting in roll mode.

I hope manufacturer will recognize this issue and fix it in next FPGA software update.
Also some feedback from manufacturer representative about this issue would be nice.

Equizer · Post time 2019-9-20 19:08:20

ARM software version is 2019082801
I tried to downgrade only ARM software, while still on FPGA V04 but it didn't help.

Equizer · Post time 2019-9-21 05:04:25

Also noticed things like this just randomly showing up in roll mode on FPGA software V04 (no probes or anything connected):

Maybe FPGA chip is defective?

Equizer · Post time 2019-9-23 05:05:10

Edited by Equizer at 2019-10-2 04:38

Video of typical issues with my device

https://filebin.net/ziz03voyvlhwtei6/MOV_0706.mp4?t=3wv5fioo

Equizer · Post time 2019-9-24 03:38:07

I think it gets worse when i increase time per division value, try to set 2s per division in roll mode and see what happens.

Equizer · Post time 2019-11-10 04:00:11

Software version 2019103001 nothing has changed, problem is still present!
I waited way more than a several days just to get nothing!

Equizer · Post time 2019-11-11 23:50:53

It's not this specific mode I really need to use, it's just very clearly shows the problem that scope has. I use the scope mostly in single trigger mode, so I want it to trigger only on actual signal, not on some software errors. In V02 i can be sure that if I select single trigger mode, DC or AC coupling, and physically connect the probe to ground (or some line in low state) scope will never trigger. On V04 if I do that scope will trigger randomly on nothing and miss the signal.

Equizer · Post time 2019-11-15 02:08:39

Random pulses in roll mode when coupling is set to GND
https://filetransfer.io/data-package/waEo4Ycg?do=download

Random triggering when when coupling is set to GND
https://filetransfer.io/data-package/0NOc6xqx?do=download

Issues happen only on FPGA V04, everything is fine on V02
Upgrading/downgrading versions of STM firmware makes no difference.

Equizer · Post time 2019-11-27 02:13:51

Firmware 2019110801 problem is still there!
It's definitely an FPGA issue, I already sent you a video of my issues, can I at least get some feedback from actual engineers?

Hantek 2C42 random pulses in roll mode

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