National Instruments SC-2040 - page 19

Chapter 2 Configuration and Installation
© National Instruments Corporation 2-5 SC-2040 User Manual
Table 2-4. Channel Gain Selection
Switch Description Configuration
U2
U6
U9
U14
U17
U21
U24
U28
Gain Table
Unity gain position—For
unity gain (gain = 1), open all
the switches by pushing down
the OFF end of the switches.
(factory setting) OFF
1234
The unity gain position has
the number side up.
A B C D
Other gains—Refer to
Supplementary Configuration
Information, later in the
chapter, and the gain table on
the board itself.
Table 2-5. Channel Input Mode
Switch Description Configuration
W2
W3
W4
W5
W6
W7
W8
W9
A-B position—Use this
setting for connecting ground-
referenced signals to the
SC-2040 (factory setting).
W2
A B C
B-C position—Use this setting
for connecting floating (non-
ground referenced) sources.
A 100 kΩ resistor is
connected from the negative
channel input to the SC-2040
analog ground.
W2
A B C
The W3–W9 jumper
positions are the same
as on W2.