razorback.calibrations module

a collection of calibration functions.

razorback.calibrations.metronix(filename, sampling_rate, chopper_on_limit=None, version_pattern=None, alpha_map=None)

return calibration function for metronix devices

Parameters:

  • filename (string) – data file name resolved with data.get_data_file(filename, calibrations.METRONIX_DATA_PATH)

  • sampling_rate (float)

  • chopper_on_limit (float [optional]) – threshold for activating chopper default to METRONIX_CHOPPER_ON_LIMIT

  • version_pattern (str [optional]) – regexp pattern for extracting sensor version identifier from filename default to METRONIX_VERSION_PATTERN

  • alpha_map (dict (version->alpha) [optional]) – alpha value to use for sensor version default to METRONIX_ALPHA_MAP

Returns:

calibration function

Return type:

f(freq) -> calib

Notes

The chopper on/off switch is based on the sampling rate and the chopper limit:

  • sampling_rate <= chopper_on_limit -> chopper on

  • sampling_rate > chopper_on_limit -> chopper off