Campbell AVW1 Especificaciones descargar pdf (Pagina 33)

AM16/32B Relay Analog Multiplexer

6.2 Differential Analog Measurement without Sensor

Excitation

Sensor to Multiplexer wiring - Up to two differential sensors that

don't require excitation may be connected to one input SET with panel

switch set to “4x16” mode. Sensor shields are connected to the input

“

” terminals.

Multiplexer to Datalogger wiring - The two pairs of COM terminals

(ODD H, ODD L and EVEN H, EVEN L) are connected to two pairs

of differential analog inputs at the datalogger. Observe H to H and L

to L from sensor to multiplexer to analog input. In “4x16” mode up to

32 differential sensors can be measured by two differential datalogger

channels in this way.

With panel switch set to “2x32” mode, one differential input can

measure up to 32 differential sensors in SETs of two with appropriate

programming.

6.3 Half Bridge Measurements

Measurements of this type may be subdivided into three categories

based on completion resistance and the presence or absence of

measured excitation. If the sensor's completion resistor(s) are

installed at the datalogger panel (example: a CSI 107 probe modified

for multiplexer use), then three probes per SET may be excited and

measured in “4x16” mode (Figure 13). However, if the circuit is

completed within the sensor (e.g. potentiometers), then excitation,

wiper signal, and ground must be multiplexed. Because excitation

and ground may be multiplexed in common, up to two sensors per

SET may be measured (Figure 14). If measured excitation is required

(i.e. four wire half-bridge), then only one sensor per SET of four may

be measured (Figure 15).

6.3.1 Half Bridge Measurement with Completion Resistor at

Datalogger

Sensor to Multiplexer wiring - up to three half bridges may be

connected to one input SET in “4x16” mode, provided that the

sensors’ three completion resistors are located at the datalogger

(Figure 13).

Multiplexer to Datalogger wiring - Signal lines from the multiplexer

COM terminals tie to three consecutive single-ended analog input

channels. Three precision completion resistors connect from analog

input channels to analog ground in CR10(X) or to “

” in the other

dataloggers.

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Campbell AVW1 Especificaciones Pagina 33