Leadoff Impedance Testing

[andrewjaykeller]

Ok so turning Channel 1 - lead-off impedance signal injecting ('z101Z') produces the proper impedance we should be seeing of 4.86 kOhm (+/- 20% of 6nA) with external 2.2kOhm series resistor and internal 2.2kOhm series resistor:
https://www.dropbox.com/s/3zwph81rg6z67io/Screenshot%202016-02-29%2007.57.13.png?dl=0

Then turning channel 2 [-] on ('z201Z') produces NO system other internal test signals:
https://www.dropbox.com/s/qase0x8du8zmlpa/Screenshot%202016-02-29%2007.59.42.png?dl=0

Then turning channel 3 [-] on ('z301Z') things get weird:
https://www.dropbox.com/s/noskayouy88cxry/Screenshot%202016-02-29%2008.01.24.png?dl=0
--- The voltage on channel 1 and 2 are the same at 29.6uVrms
--- The voltage on channel 2 increases by 2*9uVrms to 29.6uVrms
--- The voltage on channel 1, 3, 4, 5, 6, 7, 8 increases by 9uVrms

Then turning channel 4 [-] on ('z401Z'):
https://www.dropbox.com/s/t6m97cyei63eete/Screenshot%202016-02-29%2008.06.17.png?dl=0
--- The voltage on channel 1, 2, and 3 are the same at ~39uVrms
--- The voltage on channel 3 increases by 2*9uVrms to 39uVrms
--- The voltage on channel 4, 5, 6, 7, 8 increase by 9uVrms

The pattern continues all the way to turning channel 8 on:
https://www.dropbox.com/s/05wczobqirgcabj/Screenshot%202016-02-29%2008.12.00.png?dl=0
https://www.dropbox.com/s/fmooe38crukutel/Screenshot%202016-02-29%2008.12.09.png?dl=0
https://www.dropbox.com/s/ltnn4wpduskzd49/Screenshot%202016-02-29%2008.12.20.png?dl=0
https://www.dropbox.com/s/a8xeidrrq52gt5p/Screenshot%202016-02-29%2008.12.31.png?dl=0

And then to turn them off, I MUST turn them off consecutively starting from channel 1 going to channel 8, i cannot turn them off starting from channel 8 and working down.