National Instruments DAQ X Series User Manual page 263

Appendix B Troubleshooting
common-mode rejection ratio (CMRR). These methods are outlined in the
Connecting Analog Input Signals
AI GND is an AI common signal that routes directly to the ground
connection point on the devices. You can use this signal if you need a
general analog ground connection point to the device. Refer to the
Use Differential Connections with Ground-Referenced Signal Sources
section of Chapter 4,
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 B-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.
X Series User Manual
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section of Chapter 4,
Analog Input, for more information.
1/sample period = sample rate
Channel 0
Channel 1
Convert Period
Sample Period
Figure B-1. AI Sample Clock and AI Convert Clock
1/convert period = convert rate
B-2
Analog Input.
When to
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