National Instruments SCXI-1121 Calibration Procedure page 11

Verifying the Operation of the Module
© National Instruments Corporation
The verification procedure determines how well the SCXI-1121 module
is meeting its specifications. You can use this information to select the
appropriate calibration interval for your application. Refer to the
the Module section for information on how to configure the channel gain,
channel filter, and excitation level.
Verifying Analog Input Offsets
Complete the following steps to verify the analog input offsets:
1. Read the Test Conditions
2. Refer to Table 12 in the
settings for the module. NI recommends verifying all ranges and gains,
but you can save time by checking only those ranges used in your
application.
3. Set the channel gain on all channels to the gain you want to test,
starting with the smallest gain available for the module. Table 12
shows available gains.
4. Set the channel filter for all channels on the module to 10 kHz.
5. Connect the calibrator to the analog input channel you are testing,
starting with channel 0. If you do not have an SCXI terminal block
such as the SCXI-1320, refer to Table 7 to determine the pins on the
96-pin front connector that correspond to the positive and negative
inputs of the specified channel. For example, the positive input for
channel 0 is pin A32, which is labeled CH0+. The negative input for
channel 0 is pin C32, which is labeled CH0–.
Table 7. SCXI-1121 Front Connector Pin Assignments
Pin Number
32
31
30
29
28
27
26
25
24
section in this document.
Specifications section for all acceptable
Column A Column B
CH0+
NC
EX0+
NC
EGND0
NC
CH1+
NC
EX1+
11
Setting Up
Column C
NC CH0–
NC NC
NC EX0–
NC NC
NC NC
NC NC
NC CH1–
NC NC
NC EX1–
SCXI-1121 Calibration Procedure