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IMPORTANT NOTE: The resistors, R1 and R2, are going to dissipate all the power
in the divider circuit according to the equation Current = Voltage / Resistance. The
higher the value of the resistance (R1 + R2) the less power dissipated by the divider
circuit. Here is a simple rule:
For Attenuation of 5:1 or less, no resistor should be less than 10K.
For Attenuation of greater than 5:1, no resistor should be less than 1K.
The CIO-TERMINAL has the circuitry on board to create custom voltage dividers.
The CIO-TERMINAL is a 16" by 4" screw terminal board with two 37 pin D type
connectors and 56 screw terminals (12 - 22 AWG). Designed for table top, wall or
rack mounting, the board provides prototype, divider circuit, filter circuit and pull-up
resistor positions which you may complete with the proper value components for your
application.
6.2 DIFFERENTIAL & SINGLE ENDED INPUTS
Two type of analog inputs are commonly found on A/D boards, they are differential
and single ended. Single ended is the less expensive of the two.
COMMON MODE RANGE
Differential inputs have a common mode range (CMR) (Vcm). Single ended inputs
have no CMR. Common mode range is the voltage range over which differences in
the low side of the signal and A/D input ground have no impact on the A/D's
measurement of the signal voltage. A differential input can reject differences between
signal ground and PC ground.
Figure 6-2 shows a differential mode input.
Figure 6-2. Differential Input
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