Справочник Пользователя для National Instruments NI 6014
Appendix C
Common Questions
© National Instruments Corporation
C-5
How can I use the STARTSCAN and CONVERT* signals on the
NI 6013/6014 to sample the AI channel(s)?
NI 6013/6014 to sample the AI channel(s)?
The NI 6013/6014 uses the STARTSCAN and CONVERT* signals to
perform interval sampling. As Figure C-2 shows, STARTSCAN controls
the scan interval, which is determined by the following equality:
perform interval sampling. As Figure C-2 shows, STARTSCAN controls
the scan interval, which is determined by the following equality:
Figure C-2. Scan Interval
CONVERT* controls the interchannel delay, which is determined by the
following equality:
following equality:
This method allows multiple channels to be sampled relatively quickly in
relationship to the overall scan rate, providing a nearly simultaneous effect
with a fixed delay between channels.
relationship to the overall scan rate, providing a nearly simultaneous effect
with a fixed delay between channels.
1
scan interval
-------------------------------
scan rate
=
Channel 0
Channel 1
Interchannel Delay
Scan Interval
1
interchannel delay
--------------------------------------------
sampling rate
=