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Amy
Guest
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 Posted: Wed Apr 07, 2004 8:47 pm Post subject: adc200.vi |
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Hi,
I am trying to use the ADC 212 to capture the output of a laser whilst varying the power. I am varying the power between 0.6 and 0.9 mW. When using the oscilloscope, the dc voltage can be seen to change slightly as the power is increased, however, when I'm using the adc200.vi, I just get a really noisy signal the varies with time. Do you know why this would be?
Thanks. |
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markspencer
Site Admin
Joined: 07 May 2003
Posts: 610
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| Posted: Thu Apr 08, 2004 9:25 am Post subject: |
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Hi,
The problem could be in the routine where the ac/dc coupling have been set up, if you are looking at a in Picoscope and it displays it correctly, do you have DC selected. If so you will have to set the dc relay to do this use the following function:
Best regards, |
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Amy
Guest
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| Posted: Thu Apr 08, 2004 11:19 am Post subject: |
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| Thanks, that seems to work. |
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Amy
Guest
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| Posted: Wed Apr 14, 2004 5:42 pm Post subject: |
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Hi,
I have set the adc.vi to dc and although the signal is no longer noisy, there are spikes in the signal. Is this related to the oversample and timebase values? |
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markspencer
Site Admin
Joined: 07 May 2003
Posts: 610
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| Posted: Thu Apr 15, 2004 8:06 am Post subject: |
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Hi,
The results that are displayed are those values recieved by the unit you are using. Is it possible that the signal actually has spikes. The timebase and oversample would not create spikes in your signal.
Best regards, |
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