Pico Technical Support and Discussion Forum

Eastern

Hi,

Can someone tell me how I can get 50 MHz clock waveforms that do not have significant amplitude modulation and distortion.
I have the time-base set on 50nSec and I'm measuring on a board that is connected to the PC ground, but powered from an ungrounded wall transformer. I suspect my problem is with 60 Hz, but I can not seem to remove it from impacting my high frequency measurements.
Is there a way to filter out power line frequency components.

Thanks,
Dave

Sarah · Guest

Hi

Thank you for your post, I am sorry to hear that you are having this problem.

Unfortunately there is no way to directly filter out the frequency using the Picoscope hardware or software. Instead maybe using a high pass filter on the signal before you put it in to the unit might help?

Hope this helps

Best Regards

Eastern · Posted: Wed Nov 10, 2004 2:02 pm Post subject: removing 60 Hz

This must be a common problem Exclamation

. Is there someone out there who has a better solution?
Since I'm using a "floating" notebook, I will now see if an AC grounded desktop is any better.

miguelroncancio · User Joined: 16 Nov 2004 Posts: 3

Hi Dave

I think for this model the sampling sate is 200 MS/sec (1 channel), in other words, each cycle of 50 Mhz signal will be sampled 4 times maximum, if you have a square wave it has higher frecuency harmonics components (say 10 times), so you will need a 500 Mhz instrument to obtain a better quality.

Miguel

Eastern · Posted: Tue Nov 16, 2004 7:48 pm Post subject:

Thanks Miguel,

Although real-time sampling is limited at 200MS/s, ETS should work fine with 10GS/s on a repetative clock of 50MHz. I should not need a 500MHz real-time sampling scope for a repetative signal.
The analog bandwidth of 200MHz should pass the 4th harmonic, not great, but enough to show a descent square wave.

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