Hantek DSO5202P not working properly

Alx · Post time 2016-10-3 20:26:27

Edited by Alx at 2016-10-11 17:11

I recently purchased an DSO5202P oscilloscope.
I have tested it on 12V@150Hz, but it does not clearly show the square wave on the first channel.
I tested the same signal on both channels and on the second channel i saw the right square wave signal. On the 1-st channel signal is different - height of front is above the signal level and it exponentially lowering to the signal's back, the same situation on the back of signal but vise versa - it exponentially lowering to the zero. Probes were calibrated by the internal square wave(5V@1KHz). Looks like in has problem with vertical amplifier compensation on different frequencies because in internal square wave(5V@1KHz) it shows square signal in both channels, but in the 1-st channel level of sygnal is a bit lower. There was no matter of probes changing - no luck.
Give me some resolution. Please help.

Alexandr

Alx · Post time 2017-1-23 23:55:38

Edited by Alx at 2017-1-24 04:01

AQY280SX was changed and it has helped. Thanks.
It would be good if Hantek added the issue in check list on production.

amy · Post time 2016-11-8 11:05:55

Alx replied at 2016-10-26 18:11
Could you give me links to datasheets for that components and places where i should replace it in sc ...

Sir, please refer to the picture.

Alx · Post time 2016-10-26 18:11:31

Edited by Alx at 2016-10-27 17:18

Could you give me links to datasheets for that components and places where i should replace it in scope?
I have found AQY280SX http://www.mouser.com/ds/2/316/panasonic_AQW,AQY280,282,284-347496.pdf is it correct?
Can't find what is U100.

amy · Post time 2016-10-26 16:29:43

Edited by amy at 2016-10-26 16:31

Alx replied at 2016-10-26 14:38
Do not understand what i should solder, could you explain?

You can try to replace a component (U100, AQY280SX).

Alx · Post time 2016-10-26 14:38:11

Do not understand what i should solder, could you explain?

amy · Post time 2016-10-26 10:31:02

Sir, could you solder?

Alx · Post time 2016-10-24 16:53:33

Just checked. The problem is only in Hz. In MHz and KHz it works fine.

amy · Post time 2016-10-13 09:19:38

Sir, please try to test other frequency signal, greater than or less than 1K.
Is there a similar problem?

Alx · Post time 2016-10-11 17:10:47

Edited by Alx at 2016-10-11 17:17

Probes were adjusted in internal square wave(5V@1KHz) and shows right square wave. Only on 150Hz it shows wrong form of signal. And i switched probe from one channel to another - forms of signal didn't change.

Hantek DSO5202P not working properly

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