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METRIX OX8050 oscilloscope - spikes on square wave signal

tuchap

New Member
Hello,

I've a Metrix OX8050 oscilloscope that displays a spike on square wave transitions. This is on both channels and the same with AC and DC input. The probe is correctly compensated and it's the same when injecting an external 1kHz square wave through a coaxial cable. Any ideas? Thanks
 

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tuchap

New Member
You have a short ground clip lead ?



Regards, Dana.
The issue is with internal probe adjust signal (then internal ground of the scope), and also when feeding through a coaxial cable, then not ground related.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
Hello,

I've a Metrix OX8050 oscilloscope that displays a spike on square wave transitions. This is on both channels and the same with AC and DC input. The probe is correctly compensated and it's the same when injecting an external 1kHz square wave through a coaxial cable. Any ideas? Thanks
If the calibration signal looks like that, how can you know the probe is correctly compensated? - it looks very much like it isn't, perhaps the probe is faulty?.

Is the probe just x10, or is it switchable x1/x10?.
 

tuchap

New Member
If the calibration signal looks like that, how can you know the probe is correctly compensated? - it looks very much like it isn't, perhaps the probe is faulty?.

Is the probe just x10, or is it switchable x1/x10?.
Because I've tried with several different probes (10x and switchable) and by direct connection to a generator. It's possible to see that the compensation is correct because this overshoot is much shorter than the slope induced by wrong compensation.
 

rjenkinsgb

Well-Known Member
Most Helpful Member
The probe compensation only works in x10 and that must be only adjusted with the probe switched to the x10 setting.
(And only using the insulated tool supplied with the probe kit).

Direct connections are not reliable with fast edges.
 

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