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3206 and 200MHz frequency

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3206 and 200MHz frequency

Postby Adel » Wed Sep 13, 2006 6:30 pm

I just purchased a 3206 model and the following could be my lack of knowledge of the scope and/or the software. I connect a CW to Channel A of the scope, input from my Signal Generator at -10dBm, at frequencies between 75MHz and 200MHz. The shape detected by the scope is anything but a sinewave and the measured frequencies do not match at all. I understand that the scope is not the tool to precisely measure VHF but I would've like to see at least something close to the input frequencies, like my conventional TEK 2440 scope shows. Is there a setting I am missing?
Thank you.
Adel
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Postby alan » Fri Sep 15, 2006 4:46 pm

Hi,

The single shot sampling rate of the 3206 is 200MSPS so with a 75MHz sinewave you have about 3 samples per waveform.

To view higher frequency signals I suggest you use ETS sampling which boosts the sampling rate to GSPS but only works for repetitive signals (ie the sort of fast waveforms that could have been seen on an old analogue scope. )

View your 75MHz signal then change the trigger mode to ETS the waveform should look a lot better!

Regards
Alan
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Postby Adel » Fri Sep 15, 2006 11:25 pm

Thank you Alan. Yes indeed with the Trigger set to ETS the wave form is much lik a sine wave and I was able to get as high as 188MHz, with a frequency measurement fairly acurate.
Regards.
Adel
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