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National Instruments Corporation C-1 PCI-6023E/6024E/6025E User Manual
C
Common Questions
This appendix contains a list of commonly asked questions and their
answers relating to usage and special features of your board.
General Information
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 PCI E Series boards. 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 seamless
changing of 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. For example, these boards have a sampling
rate of 200 kS/s. This sampling rate is aggregate: one channel at 200 kS/s
or two channels at 100 kS/s per channel illustrates the relationship.
What type of 5 V protection do the boards have?
The boards have 5 V lines equipped with a self-resetting 1 A fuse.
PCI.book Page 1 Wednesday, September 16, 1998 9:09 AM