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Chapter 3
Configuring and Testing
NI PXI-4220 Software-Configurable Settings
Common Software-Configurable Settings
NI PXI-4220 User Manual
This section describes how to set the bridge configuration, voltage
excitation level, filter bandwidth, and gain/input signal range, as well as
how to use configuration utilities in MAX to programmatically perform
offset null compensation and shunt calibration. It also describes how to
perform configuration of these settings for the NI PXI-4220 in
NI-DAQmx. For more information about the relationship between the
settings and the measurements and how to configure settings in your
application, refer to Chapter 5,
This section describes the most frequently used software configurable
settings for the NI PXI-4220.
Bridge Configuration and Completion
Bridge configuration is a software configurable setting that allows you
to connect quarter-, half-, or full-bridge sensors configurations. Refer to
Chapter 4,
Theory of
Operation, for more information.
Excitation Level
Excitation level is a software configurable setting that allows you to set the
voltage excitation level on Pins 2 and 7. You can choose voltage excitation
settings between 0 and 10 V. To prevent the module from overheating,
refer to Table 3-1 for appropriate excitation levels for common sensor
resistances.
(resistance connected between the excitation terminals) × (29.0 mA)
Table 3-1 shows the maximum allowable excitation voltages for standard
bridge configurations and resistances. For other bridge resistances, the
maximum allowable excitation voltage is:
V
, max
EX
Refer to Chapter 4,
Theory of
excitation.
Developing Your
(
bridge resistance
=
Operation, for more information about
3-2
Application.
) 0.029 A
(
)
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