adc200.vi

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Amy

adc200.vi

Post by Amy » Wed Apr 07, 2004 8:47 pm

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
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Post by markspencer » Thu Apr 08, 2004 9:25 am

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:

Code: Select all

adc200_set_dc (1);
Best regards,
Regards,

Mark Spencer

Amy

Post by Amy » Thu Apr 08, 2004 11:19 am

Thanks, that seems to work.

Amy

Post by Amy » Wed Apr 14, 2004 5:42 pm

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
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Post by markspencer » Thu Apr 15, 2004 8:06 am

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,
Regards,

Mark Spencer

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