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National Instruments Corporation
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Introduction
This chapter describes the AMUX-64T; lists what you need to get started
with your AMUX-64T; describes the software programming choices and
optional equipment; and explains how to unpack your AMUX-64T.
About the AMUX-64T
The AMUX-64T is a front-end analog multiplexer that quadruples the
number of analog input signals that can be digitized with a National
Instruments MIO board (except the AT-MIO-64). The AMUX-64T has
16 separate four-to-one analog multiplexer circuits. Four AMUX-64T
boards can be cascaded to digitize up to 256 single-ended or 128
differential signals by one MIO board.
The AMUX-64T has an integrated circuit temperature sensor that can
be connected as a differential input to two of the 64 input channels
(jumper-selectable) for low-cost thermocouple cold-junction
compensation. Cold-junction compensation is achieved by adding the
temperature reading of the sensor to the temperature readings of
thermocouples at the remaining 62 AMUX-64T input channels. You
can cascade up to four AMUX-64T boards to increase the number of
thermocouple inputs with cold-junction compensation to 248 in
single-ended mode or 124 in differential mode.
The AMUX-64T also has open component positions on all 64 input
channels. These positions are for building signal conditioning devices
such as filters and attenuators.
Note
When an MIO board is referred to without an AT, MC, NB, NEC, or SB prefix,
the reference applies to the AT, MC, NB, NEC, and SB versions of that board.
The AMUX-64T is a circuitboard assembly that is placed on a workbench
or mounted in a 19-in. rack. You can configure the AMUX-64T to draw
power from the MIO board or from an ex5 V supply. A red LED
indicates when the board is powered on. Input signal leads are attached
at screw terminals.
