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Been reading integrator out with a voltmeter for some of the testing I've been doing. Reading fluctuates. Added a filtered post amplifier to look at output with a scope. Tested a difference amplifier used with inductance balanced coils and two different 2 stage amplifiers used with mono coils. Coil not connected, 1k resistors to common on the inputs. Difference amplifier open and shorted. Everything is working except the coil command is commanding coil off when testing. There are some high frequency spikes when the one shots switch probably do to the circuits on three different cards. Not sure what to expect for noise. Suggestions appreciated.
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Images 1 and 2 suggest you have a quiet amplifier. You made something nice
Open termination makes amplifier see the 1k resistors as noise sources (5.6nV/sqrt(Hz)) so proper termination should be a coil impedance. -
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Tested a two stage pre amp to see if I could see resistor noise. My test setup is crude, looks like it's showing resistor noise. The OPA 1612 could easily be better than my test. Looks like connecting the coil to the + input thru a switch would be good if I could get the switch working.Comment
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