Measurement-computing CIO-EXP-GP Manuale Utente Scaricare il pdf (Pagina 23)

There is a gain switch for each channel (Figure 5-6). Set the input channel gain to match the expected

voltage output of the bridge you are measuring to the input range of the A/D board as described above.

CH0

X1000

X100

X10

GAIN FOR CHANNELS 0 and 4

SET FOR A GAIN OF 10.

SLIDER DOWN SELECTS GAIN

ALL OTHERS TO BE OFF (UP)

CH4

Channel Gain Switches

There is a set of DIP gain switches for each input

circuit labeled GAIN (Figure 5-6). There are four,

two-position switches for each channel. The gain

switches are labeled U, X10, X100, and X1000.

Select a gain (higher than unity) by moving the

switch for that gain down. All other switches should

be left in the UP position.

A custom gain may be selected on the CIO-EXP-GP

by installing a precision resistor and setting the

switch marked “U” (User) in the down position. See

Table 5-2 below for positions and some sample gain

values.

Figure 5-6. Channel Gain Switches

Table 5-2. User Gain Resistors - Identities

RX1077RX1033

RX1066RX1022

RX1055RX1011

RX1044RX1000

Resistor PositionChannelResistor PositionChannel

10 Ohms800

17 Ohms700

40 Ohms500

161 Ohms200

364 Ohms100

776 Ohms50

Resistor ValueGain

The equation for selecting the gain resistor is:

USER

= (40000 / (Gain − 1) ) − 40

5.6 Verifying the Installation

Your channel is now configured to make thermocouple measurements. To verify the installation, use the

InstaCal program installed on your computer. This software came with your A/D board if you bought the

board from the same manufacturer as the CIO-EXP-GP. Use the CALIBRATE option to calibrate the

CJC and verify the operation of the channel. Use the TEST option to make a measurement in

engineering units.

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