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AD637 Scale Factor Trim

Question asked by jch4416 on Jul 18, 2014
Latest reply on Jul 29, 2014 by jch4416



I have a questions on the scale factor trim described on page 8 of the datasheet. A resistor R4 (147 ohms)  is placed in series with the input and a variable resistor R3 (1K pot) is between the output and the DEN input

1) Is resistor R4 in the circuit permanently, or only switched in while adjusting R3?

2) If the input is to be AC coupled, would R4 still be used?