scope issue

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Hi All,

 

Have not done electronics in decades.    Bought a cheap scope: Hantek DSO5072P, which came with two probes.

I was working with it today to debug UNO 3 stepper motor project.  I'm now getting a funky trace for what should be a 1 kHz sample trigger.  

It turns out to be the probe.   Any idea what this is?  It the probe fried?  The label on the probe says

PP-90

80MHz/6MHz

10X-600Vpk

1x-200Vpk

CAT II

 

I have had it set to 10x.

 

Matt

 

This topic has a solution.
Last Edited: Fri. May 10, 2019 - 06:02 PM
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Fixed.  It needed the probe compensation pot  to be adjusted.  But this blew me away.  I've never seen it that "off square".

Last Edited: Fri. May 10, 2019 - 06:02 PM
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A square wave can also look like that if you

accidentally select AC coupling instead of DC.

 

--Mike

 

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avr-mike wrote:

A square wave can also look like that if you

accidentally select AC coupling instead of DC.

 

--Mike

 

 

Thanks.  Good to know.

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Always use DC coupling unless you NEED to use AC coupling

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MattRW wrote:

Fixed.  It needed the probe compensation pot  to be adjusted.  But this blew me away.  I've never seen it that "off square".

 

Yes! First you hang the probe on the "calibrate" bar and adjust the probe compensation to get a nice square wave. Then you check your signals.

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