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Chapter 4
Signal Conditioning
4-6
©
National Instruments Corporation
Figure 4-2.
Bias Return Resistor for DC-Coupled Floating Source on Channel 1
Single-Ended Inputs
When measuring floating signal sources, you should configure the MIO
board to supply a ground reference. Therefore, you should configure the
MIO board for referenced single-ended input. In this configuration, the
negative input of the MIO board instrumentation amplifier is tied to the
analog ground. Therefore, you should use the AMUX-64T board in its
factory configuration. In the factory configuration, jumpers are in the two
series positions, E and F (see Table 4-1). In this configuration, you should
tie all of the signal grounds to AIGND. You can build signal conditioning
circuitry such as filters and attenuators (described in
, and
later in this chapter) in the open component positions.
Channel 1
(+in)
Channel 33
(–in)
100
k
Ω
Resistor
A R5
B R6
C R7
D R8
F R68
E R67
G C4
AIGND
100
k
Ω
D
F
G
E
+ Channel
– Channel
Input Schematic
+
–
To
Input
Multiplexer
Jumper