Wrong V position on 50ms and slower time bases

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lazyman
Posts: 1
Joined: Fri May 19, 2017 6:01 pm

Wrong V position on 50ms and slower time bases

Post by lazyman »

Hi.

I have experimenting with this little useful tool.

I'm upgraded firmware to latest -060 version.

Everything is of for time-bases faster then 20ms. V ofset is calibrated.

But when i switch to 50ms and slower V offset goes to negative and readed values are way off. Is this a firmware problem or may be something hardware related?
Petroid
Posts: 21
Joined: Wed May 17, 2017 4:50 pm

Re: Wrong V position on 50ms and slower time bases

Post by Petroid »

Hello!
I'm having the same problem. I reset DSO to default settings (hold 2 buttons), then set coupling to GND, then calibrate Vpos (hold Vsen button). Then I see that at timebases faster than 50ms the trace stays at 0, but at timebases slower than 50ms it shifts about 2 div down. The error does not depend on Vsen and is always about 2 div.
Also resetting the trigger level always sets the trigger to that wrong Vpos (about 2 div lower) even at timebases faster than 50ms.
I have checked the digital board without analog and the results are the same.

I'm also at version 060.
jye1
Posts: 1221
Joined: Wed Feb 20, 2013 4:58 pm

Re: Wrong V position on 50ms and slower time bases

Post by jye1 »

This was caused by wrong initialization of capture buffer. If you wait long enough to let the wrong data be overwritten by incoming data you'll see correct display. This is a firmware bug for which we'll quickly release a fix.
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