Campbell AM416 Instrukcja Obsługi Pobierz pdf (Strona 18)

AM416 RELAY MULTIPLEXER

FIGURE 10. Half Bridge (Modified 107 Temperature Probe) Hook-up and Measurement.

FIGURE 11. Potentiometer Hook-up and Measurement

6.3.2 POTENTIOMETER MEASUREMENT

Sensor to Multiplexer wiring - up to two

potentiometers may be connected to one input

SET. Excitation and ground leads may be

common; signal leads must be routed

separately (Figure 11).

Multiplexer to Datalogger wiring - Signal lines

from two COM terminals are connected to two

consecutive single-ended analog input

channels. One COM terminal is connected to a

datalogger switched excitation channel, and the

remaining COM line connects to datalogger

ground. Up to 32 potentiometers may be

measured by two single-ended datalogger

channels.

6.3.3 FOUR WIRE HALF BRIDGE WITH

MEASURED EXCITATION

Sensor to Multiplexer Wiring - one sensor per

input SET.

Multiplexer to Datalogger Wiring - One COM

line is tied to a datalogger excitation channel,

and two COM lines to a differential analog input.

The remaining COM line is connected to the

high side of a differential channel along with a

fixed resistor. The other side of the resistor

connects to the low side of the channel, then

ground (Figure 12). Up to 16 four wire half-

bridges may be measured by two differential

datalogger channels in this manner.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 31 32

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Campbell AM416 Instrukcja Obsługi Strona 18