National Instruments USB-621 Series User Manual page 175

Analog Output
© National Instruments Corporation
I am seeing glitches on the output signal. How can I minimize it?
When you use a DAC to generate a waveform, you may observe glitches on
the output signal. These glitches are normal; when a DAC switches from
one voltage to another, it produces glitches due to released charges. The
largest glitches occur when the most significant bit of the DAC code
changes. You can build a lowpass deglitching filter to remove some of these
glitches, depending on the frequency and nature of the output signal. Visit
for more information about minimizing glitches.
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B-3
Appendix B Troubleshooting
NI USB-621x User Manual