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The AM16/32 Multiplexer combines

the functions of our AM416 and AM32

Multiplexers. A toggle switch allows you

to configure the multiplexer to switch 16

sets of 4 lines at a time (4 x 16 mode) or

32 sets of 2 lines at a time (2 x 32 mode).

In either case, a maximum of 64 lines can

be input to the multiplexer. Signals from

the datalogger’s control ports trigger

advancement from set to set, sequentially

routing signals from each connected sen-

sor through the multiplexer’s common

(COM) terminals.

The AM16/32 is smaller and more

robust than its predecessors. In 2 x 32

applications, it uses one less differential

input channel than would be required if

an AM416 were used for the same pur-

pose. Multiple strain relief eyelets are

built into the multiplexer; a cover is also

provided to shield the multiplexer termi-

nal strips and connected wires from inad-

vertent jostling and dust. As with its pre-

decessors, the AM16/32 requires an envi-

ronment free of moisture and condensing

The AM16/32: A smaller, more robust multiplexer

humidity; our AM ENC environmental

enclosure is recommended.

Multiplexers do more than increase

system channel capacity; they can also

significantly reduce the cost of sensor

cabling, especially in applications where

long leads are required. In cases where

sensors are clustered at some distance

from the datalogger, the multiplexer is

typically located in the middle of the sen-

sor spread. The MUXSIGNAL-L and

MUXPOWER-L cables are used for the

long cable run, while expensive sensor

leads are kept short. !!

The AM16/32 can be configured for 32 sets of 2-wire sensors (channel numbers in white), or 16

sets of 4-wire sensors (channel numbers in blue). Select the desired configuration before use by

positioning the switch (white switch surrounded by red square).

Multiplexer Support

in SCWin Version 1.1

The popular SCWin Program

Generator software now has even

more functionality—it supports

Campbell Scientific multiplexers.

SCWin is a software application that

generates a datalogger program for

you—no more trying to remember

the right set of program instructions

for each sensor or output option.

You choose the datalogger type,

sensors, and output(s) you want and

SCWin does the rest. With Version

1.1 you can choose the AM416,

AM32, AM25T, or the AM16/32

multiplexer. SCWin will show you a

list of sensor configurations available

for that multiplexer. For conve-

nience, you can add multiple sensors

at the same time. A wiring diagram

is produced and you can even print

out the wiring instructions.

A beta version of SCWin 1.1 is

available at the following address:

www.campbellsci.com/resource.html

If you find problems, want to be

notified of new releases of SCWin,

or have ideas for improvements,

please let us know by email:

[email protected] !

CR9052DC updated with FFT spectral analyses

We have added real-time Fast Fourier

Transform spectral analyses to the

CR9000 Measurement and Control

System by updating the code in the

CR9052DC Anti-Alias Filter Module.

The high-performance DSP in the

CR9052 rivals the speed and capabilities

of PC-based systems. In addition, the

CR9000 system offers a rugged, portable,

12 Vdc powered solution. The CR9052

can perform 2048-point FFTs on six

channels in real-time.

The normal processing sequence is

to collect a snapshot of time-series

data, apply a time-series window

(optional), perform the FFT, nor-

malize the results into spectra

(amplitude and phase, power,

power spectral density, and dB

are options). In addition, the

CR9052 can combine adjacent

spectral components to provide

1/n octave analyses. !!

CR9052DC featured in international publication

The November edition of Testing

Technology International, a U.K.-based

periodical specializing in measure-

ments germane to vehicle testing, fea-

tured an article about our CR9052DC

anti-alias filter card for the CR9000

Measurement and Control System. The

article explains the exceptional capabil-

ities provided by the CR9052 for anti-

alias rejection on analog voltage mea-

surements and the CR9052’s ability to

perform near real-time Fast Fourier

Transform analyses. A PDF version of

the article appears on our Web site. !

The CR9052DC’s (right) anti-alias and FFT capabilities add

functionality to the CR9000 Measurement & Control System.

Speed rivals PC-based systems

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