Input Mode Selection; Table 2-7. Switch Settings For Gain Selection; Table 2-8. Input Mode Selection Jumpers - National Instruments SC-2040 User Manual

Chapter 2
To close a switch, push down the number side. Closing switch A selects a gain of 500. Closing
switch B selects a gain of 200. Closing switch C selects a gain of 100. Closing switch D selects
a gain of 10. Opening all the switches selects a gain of 1. You can select other gains by closing
more than one switch, as shown in Table 2-7.

Input Mode Selection

Jumpers W2 through W9 select the input mode for each channel on the SC-2040. Position A-B
leaves the negative input of the instrumentation amplifier connected only to the front connector.
This is the factory-default setting. Position B-C connects the negative input of the
instrumentation amplifier to the board analog ground through a 100 k resistor. This setting is
useful for keeping floating, or nonground-referenced, sources from saturating the instrumentation
amplifier. Table 2-8 shows the input mode jumper and channel selections.
© National Instruments Corporation

Table 2-7. Switch Settings for Gain Selection

Desired Gain
1
10
100
200
300
500
600
700
800

Table 2-8. Input Mode Selection Jumpers

Channel
0
1
2
3
4
5
6
7
2-7
Configuration and Installation
Close Switches
None
D
C
B
B and C
A
A and C
A and B
A, B, and C
Use Jumper
W2
W3
W4
W5
W6
W7
W8
W9
SC-2040 User Manual