National Instruments SCXI-1121 - Manual (Page 25)

Chapter 2 Configuration and Installation
© National Instruments Corporation 2-9 SCXI-1121 User Manual
Filter Jumpers
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.
Excitation Jumpers
Current and Voltage Excitation Jumpers
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
Input Channel
Number
First Filter Jumper Second Filter Jumper
4 Hz
(Factory Setting) 10 kHz
4 Hz
(Factory Setting) 10kHz
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