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National Instruments Corporation D-1 DAQCard E Series User Manual
Common Questions
Appendix
D
This appendix contains a list of commonly asked questions and their
answers relating to usage and special features of your
DAQCard E Series card.
General Information
1. What are the DAQCard E Series cards?
The DAQCard E Series cards are switchless and jumperless, enhanced
DAQCards that use the DAQ-STC for timing.
2. What is the DAQ-STC?
The DAQ-STC is the system timing control ASIC (application-specific
integrated circuit) designed by National Instruments and is the
backbone of the DAQCard E Series cards. The DAQ-STC contains
seven 24-bit counters and three 16-bit counters. The counters are
divided into 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
µ
s. 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.
3. How fast is each DAQCard E Series card?
The last numeral in the name of a DAQCard specifies the settling time
in microseconds for that particular DAQCard. For example, the
DAQCard-AI-16E-4 has a 4
µ
s settling time, which corresponds to a
sampling rate of 250 kS/s. These sampling rates are aggregate: one
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