How should I change the current range using NI DC power?

[houpuli]

I'm having difficulty measuring small current using NI 4143 SMU card.

when use in labview, it have a few current range to select from, and the lowest range (10 uA) come with a resolution and noise level below nano amp.
But when I use NIDCpower with python, I don't see an option to change the current range, and the default range gives noise/baseline of 50-100 nA, which make it impossible to measure small current.

I tried to set
' session.current_limit_autorange = 1 '
or
'session.current_level_range = 1e-5'

from the example code.

but seems none of them can reduce the noise as the labview vi version does.

Could someone help?

Thanks!