National Instruments SCXI-1121 Calibration Procedure page 14

SCXI-1121 Calibration Procedure
11. Repeat steps 3 through 10 for the remaining gain and filter values
specified in Table 12.
You have completed verifying the analog input offsets. If any of your
measurements fall outside the specifications listed in Table 12, adjust the
module as described in the
Verifying Voltage Excitation Limits
Complete the following steps to verify the voltage excitation limits:
Connect a 120 Ω resistor to the output of the excitation channel you are
1.
testing, starting with excitation channel 0.
If you have a terminal block such as the SCXI-1320, the excitation
channel connections are marked on the terminal block. If you do not
have a terminal block, refer to Table 7 for connection information.
2. Configure the excitation channel to the 3.333 V level.
3. Connect the DMM leads to the excitation output as closely as possible
to the resistor body.
4. Compare the DMM reading to the limits for excitation shown in
Table 8. If the reading falls between the Upper Limit and the Lower
Limit values, the module passed the test.
Table 8. SCXI-1121 Voltage Excitation Limits
Test Point (V)
3.333
10
Configure the excitation channel to the 10 V level, replace the 120 Ω
5.
resistor with the 800 Ω resistor, and repeat steps 3 and 4.
6. Repeat steps 2 through 5 for all remaining channels.
You have completed verifying the voltage excitation limits. If any of your
measurements fall outside the specifications listed in Table 8, adjust the
module as described in the
Verifying Current Excitation Limits
Complete the following steps to verify current excitation limits:
1. Remove the resistor from the excitation channel if you have not already
done so.
2. Configure the channel to the 0.150 mA excitation level.
3. Set the DMM to current mode, and connect it to the excitation channel
output, starting with excitation channel 0.
Adjusting Analog Input Offsets
Upper Limit (V)
3.337000
10.020000
Adjusting Voltage Excitation
14
section.
Lower Limit (V)
3.329000
9.980000
section.
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