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National Instruments Corporation C-1 PCI-6110E/6111E User Manual
Appendix
C
Common Questions
This appendix contains a list of commonly asked questions and their
answers relating to usage and special features of your 611
X
E board.
General Information
What is the 611
X
E board?
The 611
X
E board is a switchless and jumperless enhanced MIO board
that uses the DAQ-STC for timing.
What is the DAQ-STC?
The DAQ-STC is the system timing control application-specific
integrated circuit (ASIC) designed by National Instruments and is the
backbone of the 611
X
E board. The DAQ-STC contains seven 24-bit
counters and three 16-bit counters. The counters are divided into the
following three groups:
• Analog input—two 24-bit, two 16-bit counters
• Analog output—three 24-bit, one 16-bit counters
• General-purpose counter/timer functions—two 24-bit counters
The groups can be configured independently with timing resolutions of
50 ns or 10 µs. With the DAQ-STC, you can interconnect a wide variety
of internal timing signals to other internal blocks. The interconnection
scheme is quite flexible and completely software configurable. New
capabilities such as buffered pulse generation, equivalent time
sampling, and seamlessly changing the sampling rate are possible.
What does sampling rate mean to me?
It means that this is the fastest you can acquire data on your board and
still achieve accurate results. The 611
X
E board has a sampling rate of
5 MS/s. This sampling rate is at 5 MS/s regardless if 1 or 4 channels are
acquiring data.
PCI_E.book Page 1 Thursday, June 25, 1998 12:55 PM