DSO4254B channel 2 Damaged?!?

Rob_ITA

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

amy

Judging from the problem, it should be a hardware failure. Let's do some hardware tests. If you can solder, please follow these steps.

1. Open all channels, switch the volt/div between 200mV and 500mV, and check whether there is relay sound.
2. Input 1kHz/10Vpp square to four channels at the same time, their voltdiv is set to 100mV, their probe ratio is consistent. Compare and test the waveforms of several points marked in the figure below.


If you can't weld, please contact the seller for repair.

Rob_ITA

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

...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

Only on ch2 ground is shifted...

Rob_ITA

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

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

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

Rob_ITA

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

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