Unable to Measure 80MHz wave in my ScopeFun Hardware

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Unable to Measure 80MHz wave in my ScopeFun Hardware
« on: July 22, 2021, 06:09:02 AM »
Hi,

I am trying to measure a signal (83 MHz approx.) in my camera board and get 1Hz in the measure window of ScopeFun where as probing the same signal using Instek Oscilloscope I get 83MHz (expected). Attaching the Camera ON images for your reference. Can anybody let me know if I need to adjust any settings in ScopeFun to get the measurement? I am using a 100MHz oscilloscope from Pomona (https://www.digikey.com/en/products/detail/pomona-electronics/6500/737763).

When I probe same signal at lower frequency (@2.9MHz approx.), I get same reading in both ScopeFun and Instek. Refer Camera OFF images attached.

Thanks,
Sanat

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Dejan

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Re: Unable to Measure 80MHz wave in my ScopeFun Hardware
« Reply #1 on: July 29, 2021, 03:41:41 PM »
Hi, could you try to measure with AC input coupling and observe the result? I think there could be a low frequency signal present that overrides the measurements.

Re: Unable to Measure 80MHz wave in my ScopeFun Hardware
« Reply #2 on: July 30, 2021, 06:49:48 AM »
Hi DEJAN,

I have tried in AC mode as well. What I see is the DC shift goes away. The waveform stays same.

Best Regards
Sanat