Author Topic: Hameg HM 203 double trace problem  (Read 22817 times)

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Online BFX

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Re: Hameg HM 203 double trace problem
« Reply #50 on: August 19, 2014, 06:56:13 pm »
I'm not sure that IC201 is wrong. Here is photo.



The same signal on both chanels.
Only attu on channel 2 is set to 0.1V
 

Offline Andy Watson

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Re: Hameg HM 203 double trace problem
« Reply #51 on: August 19, 2014, 09:08:13 pm »
Looking pretty!

Should be easy to find the problem with channel 2 since you've got a working channel to compare it against.
 

Offline David Hess

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Re: Hameg HM 203 double trace problem
« Reply #52 on: August 19, 2014, 10:09:09 pm »
The leading edges do not look right to me.  The overshoot might exclude a probe compensation problem.

As subtle as that is it points to a major problem.
 

Online BFX

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Re: Hameg HM 203 double trace problem
« Reply #53 on: August 19, 2014, 10:54:49 pm »
Ok boys, problem solved  8)

David Hess: yes it's probe compensation problem.

Here is some updates to solve major problem


And oscilloscope works well


Tomorow final calibration and testing .... and finish.
 

Online BFX

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Re: Hameg HM 203 double trace problem
« Reply #54 on: August 24, 2014, 03:39:25 pm »
Here is some interim results of calibration.
I'm surprised form this, it's realy nice:)
I don't shorten parallel connection of resistors on input and it's beautiful to see to interference.  :-+


from owon 8202


from hameg 203-1

It's measured on second corrected channel. It's same time base and same attenuator settings.
« Last Edit: August 24, 2014, 04:55:35 pm by BFX »
 

Offline David Hess

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Re: Hameg HM 203 double trace problem
« Reply #55 on: August 24, 2014, 04:16:24 pm »
So the overshoot was in the pulse generator.  That looks good to me.
 

Online BFX

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Re: Hameg HM 203 double trace problem
« Reply #56 on: August 24, 2014, 04:18:12 pm »
yes it's my old homemade poor generator   ;D
but in this case it is easy to see that the oscilloscope works very well :)

here is screenshot from scope (before I was lazy :D )
« Last Edit: August 24, 2014, 04:51:20 pm by BFX »
 


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