DSO4254B channel 2 Damaged?!?

Rob_ITA · Post time 2021-1-5 16:43:02

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

Rob_ITA · Post 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 · Post time 2021-1-5 17:03:06

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

Rob_ITA · Post 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
[all 4ch]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW  1mVBW 500uVBW then error 52102

Self Calibration 2
[all 4ch]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW then error 52126

Self Calibration 3
[all 4ch]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW  then error 52122

Self Calibration 4
[all 4ch]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW  1mVBW 500uVBW
[1&2]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW  1mVBW 500uVBW
[3&4]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW  1mVBW 500uVBW then error 51201

Self Calibration 5
[all 4ch]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV then error 52131

Self Calibration 6
[all 4ch]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW  1mVBW 500uVBW
[1&2]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW  1mVBW 500uVBW
[3&4]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW  1mVBW 500uVBW
[1]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW  1mVBW 500uVBW
[2]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV
2mVBW  1mVBW 500uVBW then error 50100

Self Calibration 7
[all 4ch]
10V 5V  2V 1V 500mV 200mV 100mV 50mV 20mV 10mV 5mV then error 52132

Rob_ITA · Post 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 · Post time 2021-1-5 19:12:21

Only on ch2 ground is shifted...

Rob_ITA · Post 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 · Post 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?

Rob_ITA · Post time 2021-1-7 16:22:33

Can I use 1Khz/5Vpp probe compensator from my other Hantek DSO5102P or must be 10Vpp?
With "their probe ratio is consistent" you mean the same (all 4ch x1 or x10)?

ThankYou. I will test as soon as I can

Rob_ITA · Post time 2021-1-8 04:40:27

Edited by Rob_ITA at 2021-1-8 05:29

I've used 5Vpp/1Khz of DSO5102p.
1. Yes, I've relay sound when switching between 200mV/500mV.

2. These are the results all 4ch with x1:

	Point	Min	Max
ch1	1	-0,08	5,04
ch2	1	-0,08	5,04
ch3	1	-0,08	5,04
ch4	1	-0,08	5,04
ch1	2	-0,08	5,04
ch2	2	-0,08	5,04
ch3	2	-0,08	5,04
ch4	2	-0,08	5,04
ch1	3	3,78	4,38
ch2	3	2,9	4,38
ch3	3	3,04	4,4
ch4	3	2,42	4,4
ch1	4	0	4,88
ch2	4	0,08	4,96
ch3	4	0	4,88
ch4	4	0,08	4,96
ch1	5	1,84	3,32
ch2	5	1,84	3,32
ch3	5	1,84	3,32
ch4	5	1,84	3,32
ch1	6	1,7	2,78
ch2	6	1,7	2,76
ch3	6	1,7	2,76
ch4	6	1,7	2,76
ch1	7	0,46	1,34
ch2	7	0,46	1,34
ch3	7	0,46	1,34
ch4	7	0,46	1,34
ch1	8	0,52	1,4
ch2	8	0,52	1,4
ch3	8	0,5	1,38
ch4	8	0,5	1,38

DSO4254B channel 2 Damaged?!?

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