Measurement Computing CIO-EXP-RTD16 - Manual (Page 22)

Calculate a new Vref using the desired Iexc:
Vref = 10V - 5K * Iexc
Then calculate R89 value:
R89 = 10K [ ( 2
−
10V / Vref ) / ( 10V / Vref
−
1 ) ]
Install the custom excitation current resistor in R89.
Set switch S2 position 1 to OFF
6.2 CUSTOM SECOND STAGE GAIN RESISTOR - RX100
The formula for calculating the value of RX100 is:
RX100 = 149K / ( Gain - 6.96 ) Where Gain cannot be less than 7 nor greater than 64.
Install the custom gain resistor at position RX100 (next to S1 on board).
Set S1, switch 4 to ON. That is the switch labeled CUSTOM.
Set the S2, second stage gain to X7, ON.
Because this is a second stage gain, you can still use the first stage gains of 2, 4, and 8 or turn them all off
for a first stage gain of 1. That will make the second stage gain the only gain more than one.
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