Juniper Systems Allegro DAQ - Manual (Page 4)

4 User’s Guide
rugged environmental seal. The connector’s large size makes wiring
easy, and its universal design lets you integrate a variety of test and
measurement applications.
The standard NI DAQCard output is designed for a 68-pin
connector; the D connector on the DAQ Expansion Pod only has
50-pins. This means that some of the NI E Series DAQCard signals
do not connect with the 50-pin connector. The next section lists NI
DAQCard signals that have been changed or eliminated to adapt to
the 50-pin connector.
NI DAQCard signals not available with the DAQ Expansion
Pod
Some of the signals on the NI DAQCard are not available with the
DAQ Expansion Pod. These signals include:
EXSTROBE
Analog Input channel 7
Analog Input channel 15
E Series devices from National Instruments provide 16 analog
channel inputs; the DAQ Expansion Pod provides 14 available
analog channels.
For a complete listing of available signals and their descriptions,
please refer to Chapter 5: Signal Descriptions.
Sensor excitation
Sensor excitation is controlled by the Analog Output 0 (AO 0) signal
and generated by the +5V power supply from the NI DAQCard. This
+5V digital power supply is inherently noisy. A filter circuit has been
added to remove much of this noise.
Note: To prevent unnecessary noise in the output that can affect your
sensor readings, set the Sensor Excitation output to a level less than or
equal to 4.8V.
Make sure the Sensor Excitation Output voltage is above 0V
whenever the application controlling the NI DAQCard is closed.
To do this, see the section called “Continuously enable the Sensor
Excitation Output” in Chapter 6.
When you use the Sensor Excitation Output, stay within the
following constraints.
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