Electronic Engineer Discuss

Title: Hantek 2d42 no oscillosocpe signal [Print this page]

Author: achbart Time: 2019-3-20 02:09
Title: Hantek 2d42 no oscillosocpe signal
Edited by achbart at 2019-3-20 02:36

Hi there,
I was measuring a tube amplifier 120vac signal with the Hantek 2d42 wirelessly (no usb attached). I heard a buzz sound then the scope rebooted. No oscilloscope signal, but the AWG and DMM still work fine.

Would anyone have a clue what the problem could be?
Thanks.

Author: gf1 Time: 2019-3-20 04:53
Did you measure the 120vac with the DMM or with the scope?
If you did use the scope, did you set the switch on the probe to x1 or x10 position?

Author: achbart Time: 2019-3-20 05:21
Edited by achbart at 2019-3-20 05:48

gf1 replied at 2019-3-20 04:53
Did you measure the 120vac with the DMM or with the scope?
If you did use the scope, did you set the ...

I used the scope, measured using the x1 not x10.

edit: i can't access the datasheet but I think i remember the max v input was 150V. This must be peak? Everything else works fine and i didn't smell smoke so maybe there's a limit somewhere i can replace?

Thanks.

Author: gf1 Time: 2019-3-20 07:54
Edited by gf1 at 2019-3-20 14:50

Certainly not 150V. I don't remember exactly either, but I think it was raher about 40V (peak, of course).

EDIT: I checked the manual. You are right, the specs indeed say "input protection voltage 150V RMS."
The 40V or 50V I had in mind are for a different device.

What V/div was set, when you connected the high voltage?
At >= 500mv/div, there is still an internal attenuator directly at the input, prior to the the buffer amp.
At <= 200mV/div, this attenuator is bypassed.
Do you still see horizontal traces on the scope screen, or is the scope completely dead?

Author: amy Time: 2019-3-20 16:34
Yes, the protection voltage is 150RMS.
When 120 VAC is input to the oscilloscope, the oscilloscope will not be damaged.
Please restore the oscilloscope to the factory setting to try.

Author: achbart Time: 2019-3-20 22:04
Hi gf1 I only see a horizontal trace when I couple the inputs to ground.

Hi amy, thanks I'll try that tonight.

Thanks for the help everyone!

Author: Msangikihama22@gmail.com Time: 2019-3-21 05:30
Hi iwant what apps number iwant tusend multimete

Author: amy Time: 2019-3-22 11:52

Msangikihama22@gmail.com replied at 2019-3-21 05:30
Hi iwant what apps number iwant tusend multimete

Sorry, I can't understand what you mean.

Author: achbart Time: 2019-3-25 04:18
Edited by achbart at 2019-3-25 04:20

achbart replied at 2019-3-20 22:04
Hi gf1 I only see a horizontal trace when I couple the inputs to ground.

Hi amy, thanks I'll try th ...

Hi guys,
So I tried resetting to defaults and it doesn't seem to fix it. When i move the channel to the top of the screen, then bring it back down, a ripply waveform follows it. As soon as I stop 'pulling' it down, it 'snaps' back to the top. I can do this with both channels.

Also when i push 'auto' i don't hear the relays clicking anymore.

I upgraded the firmware and fpga and it doesn't seem to make a difference.

I've uploaded a video of this happening.
https://youtu.be/JI2t0O2YhZ0

Thanks for you help.

Author: amy Time: 2019-3-27 14:26
Sir, our engineer analysis that maybe the protective component on the circuit is broken.
When you input high voltage, it will cause other components to burn out.
Please contact your seller to return factory for repair.

Author: achbart Time: 2019-3-28 01:37
ok thank you

Author: achbart Time: 2019-3-28 22:00
Hi amy,
is there anywhere in Canada that I can return this for warranty. Shipping to China is cost prohibitive.

Thanks.

Author: achbart Time: 2019-3-28 22:46

achbart replied at 2019-3-28 22:00
Hi amy,
is there anywhere in Canada that I can return this for warranty. Shipping to China is cost p ...

Hi amy,
is there a location that the engineer would suggest to look for the 'burned out' components?

Thanks.

Author: amy Time: 2019-3-30 08:36
From the current phenomenon, more than one component may burn out. Sorry, we can not accurately judge.

Welcome to Electronic Engineer Discuss (https://www.eediscuss.com/)