Appendix C Troubleshooting - National Instruments X Series User Manual

Appendix C Troubleshooting
How can I use the AI Sample Clock and AI Convert Clock signals on an MIO X Series
device to sample the AI channel(s)?
MIO X Series devices use AI Sample Clock (ai/SampleClock) and AI Convert Clock
(ai/ConvertClock) to perform interval sampling. As Figure C-1 shows, AI Sample Clock
controls the sample period, which is determined by the following equation:
AI Convert Clock controls the convert period, which is determined by the following equation:
This method allows multiple channels to be sampled relatively quickly in relationship to the
overall sample rate, providing a nearly simultaneous effect with a fixed delay between channels.
Analog Output
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
information about reducing glitches.
Counters
How do I connect counter signals to my X Series device?
The Default Counter/Timer Pins
signal connections.
C-2 | ni.com
1/sample period = sample rate
Figure C-1. AI Sample Clock and AI Convert Clock
Channel 0
Channel 1
1/convert period = convert rate
section of Chapter 7, Counters, has information about counter
Convert Period
Sample Period
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