Chapter 3
Configuring and Testing
3-2
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Gain/Input Range
Gain/input range is a software-configurable setting that allows you to
choose the appropriate amplification for your application. The
SCXI-1521/B has a fixed gain of 42 V/V. Additional gain settings are
available on the digitizer device. In most applications NI-DAQmx selects
the gain for you based on the specified input range.
Fine Null Potentiometer
The fine null potentiometer has software configurable settings that allow
you to remove unwanted offset voltage. In most cases, you do not explicitly
set the fine null potentiometer, but instead allow driver software to
automatically adjust it for you. However, if you want to explicitly set the
fine null potentiometer, you can write an application program that adjusts
the fine null potentiometer settings. Refer to Chapter 4,
, for more information.
Shunt Calibration Switches
The SCXI-1521/B includes a software controllable shunt calibration switch
on each channel of the module that is used to engage or disengage a fixed
shunt calibration resistor.
Note
The gain adjustment is done for you automatically if you have performed shunt
calibration using the NI-DAQ driver. Refer to the
section for more information
about how to perform shunt calibration using the driver.
Modes of Operation
The SCXI-1521/B operates in multiplexed mode only.
Configurable Settings in MAX
Note
If you are using an NI ADE prior to version 7.0, are using an unlicensed copy of an
NI ADE, or are not using an NI ADE, additional dialog boxes from the NI License
Manager appear allowing you to create a task or global channel in unlicensed mode. These
messages continue to appear until you install version 7.0 or later of an NI ADE.
This section describes where to access each software-configurable setting
for modification in MAX. The location of the settings varies depending on
the version of NI-DAQ you use. Refer to the
section for more
information about setting locations.
