Incorrect timebase conversion for 6428e-d with ps6000a API

[premnetsuwan-tpeng]

We are trying to use the ps6000a API with our 6428e-d. In the PicoSDK, the conversion to timebases is different for the 6428e-d than other models. I've noticed that this library computes the timebase number without taking this into account.

pico-python/picoscope/ps6000a.py

Line 380 in 41e0f39

def getTimeBaseNum(sampleTimeS):

The manual: https://www.picotech.com/download/manuals/picoscope-6000-series-a-api-programmers-guide.pdf. Page 23 has the conversion for the 6428e-d and other models.

The SDK has a function ps6000aNearestSampleIntervalStateless (p. 62) that I think does the equivalent and handles the difference between models.

[hmaarrfk]

prs accepted. i don't have real hardware. so any testing is much appreciated!

[hmaarrfk]

it may also be that things got updated over time.

i had a PS6000a myself.... at one point in time...