Perform Offset Null Compensation Using Traditional Ni-Daq (Legacy) C Api; Perform Acquisition Using Traditional Ni-Daq (Legacy) C Api; Table 5-8. Ni-Daq Functions Used To Configure Scxi-1125 - National Instruments Module SCXI-1125 User Manual

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Channel
Setting
Gain
SCXI_Set_Gain
Bandwidth
SCXI_Configure_Filter
Perform Offset Null Compensation Using Traditional NI-DAQ (Legacy)
C API

Perform Acquisition Using Traditional NI-DAQ (Legacy) C API

© National Instruments Corporation

Table 5-8. NI-DAQ Functions Used to Configure SCXI-1125

NI-DAQ Function to Use
After configuring the system settings and module properties, you
can perform an offset null compensation programmatically using
SCXI_Calibrate
coarse and fine offset null potentiometers to minimize or eliminate any
electrical offset for a channel. Repeat this process for each channel by
calling the
SCXI_Calibrate
imbalance in your application as a software correction factor by
determining the residual voltage from the imbalance, and subtracting this
residual offset from each future measurement. For more information
regarding the operation of
NI-DAQ (Legacy) Function Reference Help installed by default in Start»
Programs»National Instruments»NI-DAQ.
There are several NI-DAQ functions you can use to take measurements.
Usually in SCXI the preference is to take multiple samples from multiple
channels using the
multiple-channel scanned data acquisition operation.
return until Traditional NI-DAQ (Legacy) acquires all the data or an
acquisition error occurs (MIO, AI, and DSA devices only). For this reason,
it is sometimes useful to use
Timeout_Config
functions to ensure that these functions eventually return control to your
application. After acquiring data using
organized by channel, so you should demultiplex the data using
.
SCAN_Demux
SCAN_Demux
a
into row-major order, meaning each row of the array holding
SCAN_Op
Significant
Parameters
f64 gain
(gain setting)
f64 freq
(filter cutoff
frequency if
filterMode = 1)
.
takes measurements and adjusts the
SCXI_Calibrate
function in a loop. Use the resulting
SCXI_Calibrate
function.
SCAN_Op
SCAN_Op
in conjunction with the function
SCAN_Op
, which establishes a timeout limit synchronous
SCAN_Op
rearranges, or demultiplexes, data acquired by
5-23
Chapter 5
Using the SCXI-1125
Possible Parameters
Values
1, 2, 5, 10, 20, 50, 100,
200, 250, 500, 1000,
2000
4.0, 10,000.0 Hz
, refer to the Traditional
performs a synchronous,
does not
SCAN_Op
, the resultant data is not
SCXI-1125 User Manual

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