Measurement-computing CIO-EXP-GP Manuel d'utilisateur télécharger pdf (Page 33)

7.6.1 Setting the Board Gain

10V

+5 COMP

X2.5

GND

0.5V

S17

REM

There is a switch on DIP switch block S17

(Figure 7-3) labeled X1 and X2.5. Sliding this

switch down amplifies the output of the

multiplexers by 2.5. The factory default

position (up) has a gain of 1 (unity).

The X2.5 gain switch is useful in some voltage

and bridge measurements. If you desire a

voltage gain of 2.5, 25, 250 or 2500, set this

switch

down

Figure 7-3. Board Gain

The effect of this switch is multiplicative with respect to the individual channel gains. For example, if

you have set an input channel gain to X100 and the board output gain to X2.5, the signal is amplified by

250 before it reaches the A/D board.

7.6.2 Setting the Channel Gain

There is a gain switch for each channel (Figure 7-4). 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 7-4). 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 7-1 below for positions and some sample gain

values.

Figure 7-4. Input Channel Gain Switches

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 45 46

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Measurement-computing CIO-EXP-GP Manuel d'utilisateur Page 33

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