Increased signal noise on DAC outputs when viewed with an oscilloscope

Tech Note: TN0064
Product: RP2, RX, RZ
Version: All
Date Added: 2002-12-17

Issue

An oscilloscope samples at a much higher rate than the processors run at. Users may see increased signal noise beyond the Nyquist frequency. If the sampling rate is set properly, the noise is above the hearing range of your subject and has insufficient power to have any physiological effect.

Workaround

Sample at a higher rate or filter the signal after it is sent from the device.

Important

If signal is acquired on another device, make sure that other device is running at a sampling rate at least as fast as your TDT processor to avoid aliasing artifacts.