Q. What is the purpose of increasing input resistance to 250 ohms with the IZ250 option on the Moore Industries SSX signal isolator/repeater?
A. If you anticipate that the total loop resistance where your HART transmitter resides will be lower than 230 Ohms, this option will ensure you have enough impedance in the loop to create a sufficient voltage drop for reading the HART signal by a HART host (handheld or input card). The HART digital specification requires the loop to have total loop impedance between 230 and 1100 Ohms in order to initiate and maintain stable communication with HART devices.
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