Appendix B
Troubleshooting
X Series User Manual
B-2
ni.com
common-mode rejection ratio (CMRR). These methods are o
u
tlined in the
Connecting Analog Input Signals
section of Chapter 4,
Analog Input
.
AI GND is an AI common signal that ro
u
tes directly to the gro
u
nd
connection point on the devices. Yo
u
can
u
se this signal if yo
u
need a
general analog gro
u
nd connection point to the device. Refer to the
When to
Use Differential Connections with Ground-Referenced Signal Sources
section of Chapter 4,
Analog Input
, for more information.
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
u
se AI Sample Clock (ai/SampleClock) and
AI Convert Clock (ai/ConvertClock) to perform interval sampling. As
Fig
u
re B-1 shows, AI Sample Clock controls the sample period, which is
determined by the following eq
u
ation:
1/sample period = sample rate
Figure B-1.
AI Sample Clock and AI Convert Clock
AI Convert Clock controls the convert period, which is determined by the
following eq
u
ation:
1/convert period = convert rate
This method allows m
u
ltiple channels to be sampled relatively q
u
ickly in
relationship to the overall sample rate, providing a nearly sim
u
ltaneo
u
s
effect with a fixed delay between channels.
Ch
a
nnel 0
Ch
a
nnel 1
Convert Period
Sa
mple Period
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