Chapter 2
Configuration and Installation
©
National Instruments Corporation
2-11
Notice that the SCXI-1120D has an additional fixed pre-stage gain of 0.5.
The SCXI-1120 is shipped with the first-stage gain set to 100 (position A),
and a second-stage gain set to 10 (position D). The SCXI-1120D is shipped
with the first-stage gain set to 100 (position A), and the second-stage gain
set to 20 (position E). To change the gain of your module, move the
appropriate jumper on your module to the position indicated in Tables 2-3
and 2-4. Refer to Figure 2-1 for jumper locations on your module.
To determine the overall gain of a given channel on the SCXI-1120 use the
following formula:
To determine the overall gain of a given channel on the SCXI-1120D use
the following formula:
6
W7
W15
7
W8
W16
Table 2-5.
Gain Jumper Positions
Gain
Setting
Jumper Position
First-stage
1
D
10
C
50
B
100
A (factory-default setting)
Table 2-4.
Gain Jumper Allocation (Continued)
Input Channel
Number
First Gain
Jumper
Second Gain
Jumper
Overall Gain
First-Stage Gain
Second-Stage Gain
×
=
Overall Gain
1
2
---
First-Stage Gain
×
Second-Stage Gain
×
=
