Well whatever was causing that first waveform has stopped or more probably my scope has had enough time to warm up.
Oh well back to the projects!
Oh well back to the projects!
Re: Re: Hmmmmm...
That's normal, and you usually get a really ugly sine.
Concentrate on the original problem instead.
Bricolo said:
Mine, ungrounded, gives me a full screen 50Hz sine
That's normal, and you usually get a really ugly sine.
Concentrate on the original problem instead.
Bad contact...may be
The last position of the sensitivity switch may have bad contact since less rubing takes place. Try mishandling the selector switch and check whether the behaviour has changed
Gajanan
The last position of the sensitivity switch may have bad contact since less rubing takes place. Try mishandling the selector switch and check whether the behaviour has changed
Gajanan
This is a pretty funny thread. I would concentrate on understanding why the scope is picking up this noise instead of trying to fix it. You might, in the process, learn a lot about why your audio circuits pick up noise.
The bottom line with 10x passive probes is they will pick up a ton of noise. You are basically running an antenna out of a sensitive amplifier into a hostile EM environment. The trace looks fine with the input grounded, which is as it should be. You also say the trace looks fine with an attenuating passive coax probe. That makes sense. 10x passive probes are just noisy as heck.
The bottom line with 10x passive probes is they will pick up a ton of noise. You are basically running an antenna out of a sensitive amplifier into a hostile EM environment. The trace looks fine with the input grounded, which is as it should be. You also say the trace looks fine with an attenuating passive coax probe. That makes sense. 10x passive probes are just noisy as heck.
I would like to agree, but why am I the only one with this problem?
Other members have showed images of theyr scopes on max sensitivity, and it's perfectly clean.
Other members have showed images of theyr scopes on max sensitivity, and it's perfectly clean.
Re:bad contact...may be
Mishandling - Rotate the switch a few times with high rpm.
Also try cleaning the probe and scope connectors.
Gajanan
Mishandling - Rotate the switch a few times with high rpm.
Also try cleaning the probe and scope connectors.
Gajanan
Rear ground...
Try and find out what happens if you use the rear ground terminal of the scope. This is highly recomended for small signal measurements.
read article by RAPease on www.national.com
Gajanan
Try and find out what happens if you use the rear ground terminal of the scope. This is highly recomended for small signal measurements.
read article by RAPease on www.national.com
Gajanan
I think you are referring to this Pease story:
http://www.national.com/rap/Story/0,1562,18,00.html
... which was discussed in another thread, very like this one, only a week ago on this very website.
http://www.national.com/rap/Story/0,1562,18,00.html
... which was discussed in another thread, very like this one, only a week ago on this very website.
- Status
- Not open for further replies.