Hi all,
actualy i want to control an amplifier by increasing or decreasing the gain depend on the out put,
I am using SR570 amplifier which include 28stage of sensetivity from 1pA to 1mA, and i am acquiring the out put by NI9222 data acquisition device.
at the begining i am selecting standard value for the senstivity, then if the out put with in some range of voltage ( 2 and 6), the selected senstivity will be used as default , else if the senstivity is greater than 6 the, that means the senstivity must be decrease to avoid amplifier overload, otherwise if the out put is lower than 2, the senstivity must be increase to insure enough out put amplitude.
this proceadure must be performed by increasing or decreasing one step of senstivity from the current senstivity.
my problem is that i can do that proceadure for only one time ( refer to the vi), because i couldn't find the better programing proceadure to increase or decrease senstivity by one step from the current condition. so can you share me some hint to solve that???
any help will be appreciated.
Thank you