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rob
Active User
Joined: 10 Mar 2006
Posts: 8
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 Posted: Fri Mar 10, 2006 1:43 pm Post subject: ADC212/50 Sample |
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Hi,
I have taken a screen print of a 20MHz signal measured on the ADC212/50 as it is not very smooth to say the least. When I measure the same signal on a standard 40MHz oscilloscope I get a nice sine wave. Are there any settings I need to change in order to improve this trace?
Also is there any way to place the screen print into this post or can I e-mail it to someone at technical support?
Thanks in advance
Rob
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Michael
Guru
Joined: 07 Jul 2005
Posts: 93
Location: St Neots, Cambridgeshire
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| Posted: Mon Mar 13, 2006 10:11 am Post subject: |
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Hello Rob,
You can attach images if you are a registered user.
Please post or send this image to us so we can help you further.
Best regards,
Michael
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rob
Active User
Joined: 10 Mar 2006
Posts: 8
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| Posted: Wed Mar 15, 2006 9:20 am Post subject: Screen Print |
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Hi,
figured out how to post a screen print now:
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IanE
Guest
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| Posted: Wed Mar 15, 2006 2:54 pm Post subject: |
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Rob
Yes, your PicoScope 212/50 has a 50MS/s sampling rate in real time and the wave your sampling is 20Mhz, so you're close to the minimum Nyquist sampling rate here (http://www.cs.cf.ac.uk/Dave/Multimedia/node149.html is a good site to explain this).
However, with this continuous signal, you can use ETS (Equivalent Time Sampling) on your scope to obtain a smoother image - see attached screen shot. This was performed with a timebase of 20ns/div. ETS is turned on with the Trigger option at the bottom of the screen.
Ian
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Download |
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sine.JPG |
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94.84 KB |
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1120 Time(s) |
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rob
Active User
Joined: 10 Mar 2006
Posts: 8
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| Posted: Fri Mar 17, 2006 11:11 am Post subject: |
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Hi Ian,
cheers for reply. I have used this method and it worked fine. I did notice that you had it set to AC and I also had to do this to get a nice sine wave otherwise it appeared that there was a lot of noise on the signal (which I know from looking at the standard oscilloscope that it was not the case).
Thanks a lot
Rob
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