Please select To the mobile version | Continue to access the desktop computer version

Electronic Engineer Discuss

View: 28838|Reply: 40

DSO4254B channel 2 Damaged?!?

[Copy link]

167

Threads

2071

Posts

2232

Credits

版主

Rank: 7Rank: 7Rank: 7

Credits
2232
Post time 2021-1-5 16:17:10 | Show all posts |Read mode

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.




This post contains more resources

You have to Login for download or view attachment(s). No Account? Register

x
Reply

Use magic Report

167

Threads

2071

Posts

2232

Credits

版主

Rank: 7Rank: 7Rank: 7

Credits
2232
 Author| Post time 2021-1-5 16:21:58 | Show all posts
Reply

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.

1

Threads

33

Posts

33

Credits

新手上路

Rank: 1

Credits
33
Post time 2021-1-5 16:43:02 | Show all posts
same probe(x1) on both channel 1(yellow) & 2(blue)...

This post contains more resources

You have to Login for download or view attachment(s). No Account? Register

x

1

Threads

33

Posts

33

Credits

新手上路

Rank: 1

Credits
33
Post time 2021-1-5 16:49:28 | Show all posts
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)

1

Threads

33

Posts

33

Credits

新手上路

Rank: 1

Credits
33
Post time 2021-1-5 17:03:06 | Show all posts
See also this...
ch2 with x1 and 5v arduino...

This post contains more resources

You have to Login for download or view attachment(s). No Account? Register

x

1

Threads

33

Posts

33

Credits

新手上路

Rank: 1

Credits
33
Post time 2021-1-5 17:51:08 | Show all posts
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

1

Threads

33

Posts

33

Credits

新手上路

Rank: 1

Credits
33
Post time 2021-1-5 18:59:22 | Show all posts
After further calibrations, the procedure was completed successfully. Now I get a ground shift on channel 2.
Both channel have x10 attenuation on probe.




This post contains more resources

You have to Login for download or view attachment(s). No Account? Register

x

1

Threads

33

Posts

33

Credits

新手上路

Rank: 1

Credits
33
Post time 2021-1-5 19:12:21 | Show all posts
Only on ch2 ground is shifted...

This post contains more resources

You have to Login for download or view attachment(s). No Account? Register

x

1

Threads

33

Posts

33

Credits

新手上路

Rank: 1

Credits
33
Post time 2021-1-5 21:30:45 | Show all posts
...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 ...

1

Threads

33

Posts

33

Credits

新手上路

Rank: 1

Credits
33
Post time 2021-1-6 19:17:00 | Show all posts
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?
You have to log in before you can reply Login | Register

Points Rules

Dark room|Mobile|Archiver|Electronic Engineer Discuss

2024-3-29 03:16 GMT+8 , Processed in 0.172910 second(s), 22 queries .

Powered by Discuz! X3.2

© 2001-2013 Comsenz Inc.

Quick Reply To Top Return to the list