National Instruments SCXI-1121 Manuel D’Utilisation

© National Instruments Corporation

Two-stage filtering is also available on your SCXI-1121 module. The first 
stage is located in the isolated section of the input channel, whereas the 
second stage is located in the nonisolated section of the input channel. This 
permits a higher signal-to-noise ratio by eliminating the noise generated by 
the isolation amplifier. Furthermore, two filter bandwidths are 
available—10 kHz and 4 Hz.

Your SCXI-1121 is shipped in the 4 Hz configuration. Always make sure 
to set both stages to the same bandwidth. This will ensure that the required 
bandwidth is achieved.

You can configure each excitation channel of your SCXI-1121 to either a 
Voltage or Current excitation mode. Each channel has two jumpers for this 
purpose. Set both jumpers in the same mode for correct operation of the 
excitation channel. Refer to Table 2-6 for setting up your module in the 
mode you want. Your SCXI-1121 is shipped to you in the Voltage mode.

Table 2-5.  Filter Jumper Allocation

0

W5-A

W5-B

W6

W7

1

W21-A

W21-B

W8

W9

2

W31-A

W31-B

W10

W11

3

W43-A

W43-B

W12

W13