1
AM16/32B Relay Multiplexer
1. Introduction
The primary function of the AM16/32B multiplexer is to increase the number
of sensors that can be measured by CR300-series, CR6-series, CR800-series,
CR1000, CR1000X-series, CR3000, and CR5000 dataloggers. The AM16/32B
is positioned between the sensors and the datalogger. Mechanical relays in the
AM16/32B connect each of the sensor channels in turn to a common output
destined for the datalogger. The user program advances the multiplexer
through the sensor channels, making measurements and storing data.
A slide switch located on the AM16/32B top panel selects one of two modes of
operation. In 2x32 mode, the multiplexer adds 32 terminal pairs. In 4x16 mode,
it adds 16 terminal groups with four terminals each. The datalogger program is
written according to the selected mode and the sensors to be measured.
The maximum number of sensors multiplexed by an AM16/32B depends
primarily on the type(s) of sensors to be measured.
This manual provides information for CRBasic dataloggers and
AM16/32Bs with serial numbers greater than 5056.
For Edlog datalogger support or for specifications for AM16/32Bs
with serial numbers less than 5056, see an older version of this
www.campbellsci.com/old-manuals
1.1 Typical Applications
The AM16/32B is intended for use in applications where more terminals are
needed than the datalogger has available. Most commonly, the AM16/32B is
used to multiplex analog sensor signals, although it can also be used to
multiplex switched excitations, continuous analog outputs, or even certain
pulse counting measurements (those that require only intermittent sampling). It
is also possible to multiplex sensors of different, but compatible, types (see
(p. 17)
).
1.2 Compatibility
The AM16/32B is compatible with Campbell Scientific’s CR300-series,
CR6-series, CR800-series, CR1000, CR1000X-series, CR3000, and CR5000
dataloggers.
The AM16/32B is compatible with a wide variety of commercially available
sensors. As long as relay contact current maximums are not exceeded (see
(p. 2)
), and no more than four lines are switched at a
time, system compatibility for a specific sensor is determined by sensor-
datalogger compatibility.
NOTE
