Serial monitor causes noise?

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jonr

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I've been investigating ADC noise and I find that running the Arduino IDE serial monitor makes a big difference. Ie, kill the serial monitor and I get a std dev of 2 counts. Run the serial monitor and I get 9.5 counts. Yet in both cases, no text is being transmitted while the AD readings are being taken. Does the serial monitor send some kind of data over the USB even while there is no text and does this stop when the serial monitor doesn't run?

Can this be fixed? Is there something that the teensy can do to briefly halt all USB data traffic?
 
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