Measurement-computing CIO-EXP-GP Bedienungsanleitung PDF herunterladen (Seite 34)

Table 7-1. User-Specified Gain Resistor Positions

RX1077RX1033

RX1066RX1022

RX1055RX1011

RX1044RX1000

Resistor PositionChannelResistor PositionChannel

10 Ohms800

17 Ohms700

40 Ohms500

130 Ohms300

161 Ohms200

364 Ohms100

Resistor ValueGain

The equation for selecting the gain resistor, R

USER,

for any gain between X100 and X1000 is:

USER

= (40000 / (Gain − 1) ) − 40

7.7 Setting the Input Configuration

CHANNEL CONFIGURATION SWITCHES SET

VOLTAGE, THERMOCOUPLES, OR 2/4-WIRE RTDs

BOTH 4s ARE ON (DOWN), BOTH 3s ARE OFF (UP)

CH0

CH4

IN CONFIG

Channel Configuration Switch - Voltages

A channel configuration switch is associated with each

channel (Figure 7-5). The switches are used to configure the

input circuits for voltage inputs, thermocouple inputs, 2, 3, or

4-wire RTDs and bridges.

For bridge measurements on a particular channel, set the

switches labeled “4” to the ON (down) position for that

channel.

Set the switches labeled “3” in the OFF (up) position.

Figure 7-5.

Input Channel Configuration Switches

7.8 Configuring the Bridge

As mentioned earlier in this chapter, resistance measurements are made by constructing a bridge

containing precision resistors with known values against which the unknown resistor is to be compared.

In strain gauge applications, the strain gauge sensor itself may make up a quarter of this bridge, half of

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Measurement-computing CIO-EXP-GP Bedienungsanleitung Seite 34