Chapter 4
Signal Conditioning
4-4
©
National Instruments Corporation
When the board is shipped, jumpers are inserted in the E and F positions of
the input network (see Figure 4-1). You can easily remove these jumpers to
build analog input signal conditioning circuits. Several applications
showing the use of these open component positions are discussed in the
next section,
.
Application Notes
The open component positions on the AMUX-64T board make adding
signal conditioning components to the analog input signals easier. Several
applications are covered in this section, including filtering and attenuation.
The figures in this section give examples on a specific input channel. If you
want to install the circuit on a different channel, consult Table 4-1 to
determine the equivalent component positions for the other channels.
Soldering and Desoldering on the AMUX-64T Board
The following applications require you to make modifications to the
printed circuit board, usually in the form of removing jumpers and adding
components. The AMUX-64T board is shipped with wire jumpers in the
E and F positions (see Table 4-1 and Figure 4-1).
Note
Remove the plastic insulator on the bottom of the AMUX-64T before removing
wire jumpers or adding components to the board. To remove the insulator, unscrew
the standoffs from the top of the board; the insulator and standoffs should fall off.
Replace the insulator and standoffs after completing your modifications to the
board.
Use a low-wattage soldering iron (20 to 30 W) when soldering to the board.
To desolder on the AMUX-64T, use vacuum-type tools for best results. Use
care when desoldering to avoid damaging component pads. You should use
only rosin-core electronic-grade solder. Acid-core solder damages the
printed circuit board and components.
30
(30, 62)
R185
R186
R187
R188
R125
R126
C51
31
(31, 63)
R189
R190
R191
R192
R127
R128
C52
Table 4-1.
Component Positions in Each Channel (Continued)
Channel
(Positions in Figure 4-1)
Differential
Single-Channel
A
B
C
D
E
F
G
