Campbell AVW1 Dokumentacja Pobierz pdf (Strona 35)

AM16/32B Relay Analog Multiplexer

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 (Measured Excitation Current)

Sensor to Multiplexer Wiring - one sensor per input SET. The panel

switch is set to “4x16” mode.

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 H side of a

datalogger differential channel along with a fixed resistor. The other

side of the resistor connects to the L side of the differential channel

and to ground (Figure 15). Up to 16 four wire half-bridges may be

measured by two differential datalogger channels in this manner.

"4 X 16" Mode

COM H (ODD)

COM L

COM H (EVEN)

COM L

ODD H

ODD L

EVEN H

EVEN L

SHIELD SENSOR SHIELD

COM

CR23X/

CR800/

CR850/

CR1000

21X/

CR7

CR10(X)

CR3000/

CR5000

EX E E VX

H H H H

L L L L

H H H H

L L L L

FIGURE 15. Four Wire Half Bridge Hook-up and Measurement

The CR5000 and CR3000 also have current excitation channels which

allow a resistance measurement. Because the excitation current is

known, it is not necessary to measure the voltage across a fixed

resistor to determine the current as in Figure 15. See Section 5.3 for

an example.

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 49 50

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Campbell AVW1 Dokumentacja Strona 35

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