amy Publish time 2021-1-5 16:17:10

DSO4254B channel 2 Damaged?!?


Customer Consultation

Hi, I bought the DSO4254B and I think there is a problem with channel 2.
When I press the AutoScale button it gives me an incorrect value (about 100V). On the other channels it works correctly.
Product purchased on November 29, 2020 from aliExpress.




amy Publish time 2021-1-5 16:21:58

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Do you swap probes to test ch1 and CH2? Does the oscilloscope still show CH2 abnormality?

Please warm up for half an hour and perform self calibration. Do not connect any test line or probe during self calibration. Then test again.

Rob_ITA Publish time 2021-1-5 16:43:02

same probe(x1) on both channel 1(yellow) & 2(blue)...

Rob_ITA Publish time 2021-1-5 16:49:28

see the trigger level on ch2.
I pushed 50% and DSO set to 6.2v. Why?
Label on probe comparator connector shows 1Khz 2Vp~p

Is there something inside ch2 that I can check? I've also another Hantek DSO (DSO5102P)

Rob_ITA Publish time 2021-1-5 17:03:06

See also this...
ch2 with x1 and 5v arduino...

Rob_ITA Publish time 2021-1-5 17:51:08

More than 30 minutes have passed since it was turned on. I disconnected all the probes from the channels and performed a series of self-calibration.
I get always different errors.

Self Calibration 1

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW1mVBW 500uVBW then error 52102

Self Calibration 2

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW then error 52126

Self Calibration 3

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBWthen error 52122

Self Calibration 4

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW1mVBW 500uVBW

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW1mVBW 500uVBW

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW1mVBW 500uVBW then error 51201

Self Calibration 5

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV then error 52131

Self Calibration 6

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW1mVBW 500uVBW

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW1mVBW 500uVBW

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW1mVBW 500uVBW

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW1mVBW 500uVBW

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW1mVBW 500uVBW then error 50100

Self Calibration 7

10V 5V2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV then error 52132

Rob_ITA Publish time 2021-1-5 18:59:22

After further calibrations, the procedure was completed successfully. Now I get a ground shift on channel 2.
Both channel have x10 attenuation on probe.




Rob_ITA Publish time 2021-1-5 19:12:21

Only on ch2 ground is shifted...

Rob_ITA Publish time 2021-1-5 21:30:45

...and in the last screen with all 4 probes connected at 1Khz, 2Vpp only the waveform on channel 2 floats up / down on the screen. The other 3 are stable ...

Rob_ITA Publish time 2021-1-6 19:17:00

amy replied at 2021-1-5 16:21
Reply

Do you swap probes to test ch1 and CH2? Does the oscilloscope still show CH2 abnormality?


can I send you some videos to caiyijun@hantek.com in order to study the problem?
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