just questions to understand some design-choices

[orgua]

First: thanks for this elegant module! It works as expected. But I'm left with some questions while porting my scripts.

May I ask why the high-level comfort-functions like .apply_voltage are only accessible from the device-class (Keithley2600) and not from the smu-class (Keithley2600Base) that replicates the TSP-Syntax in python?
Well, for obvious reason there should be no name-collision. But apart from that?
The biggest drawback is that scripted measurement-functions for a job on one specific smu-channel always need two parameters (device- and smu-class) instead of just one (smu-class) only to use these two parameters always in combination for the high-level-functions (example A). the only alternative would be to not use the high-level-functions (example B). Both options complicate things more than they should.

Am I overseeing something here, apart from hacky solutions? Wouldn't something like example C be the most elegant solution?

example:

def calibrationA(keithley, smu):
    # ability to choose smu-channel and use high-level functions
    keithley.apply_voltage(smu, 5)
    return keithley.measure_current(smu)

def calibrationB(smu):
    # only low-level TSP-Syntax possible
    smu.source.levelv = 5
    smu.source.limiti = 0.1
    smu.source.autorangev = smu.AUTORANGE_ON
    smu.source.func = smu.OUTPUT_DCVOLTS
    value = smu.measure.i()
    smu.source.output = smu.OUTPUT_OFF
    return value

def calibrationC(smu):
    # possible solution with less code-overhead
    smu.apply_voltage(5)
    smu.source.limiti = 0.1
    return smu.measure_current()

My second concern is the high-level function .set_integration_time(). Why does someone want to set this in seconds and deal with unportable code that may cause aliasing-fragments, when setting the time to no multiple of the cycle-time? I understand that seconds are a universal SI-Unit, but there is a reason why the original parameter is "nplc", which is set to 1.
This implementation seems more harmful than helpful, doesn't it?