chcal
chcal (change calibration) reads different calibration formats and converts them into others.
The most common usage is
chcal -outdir /home/newcal -old_to_new -tojson *.txt
This converts old metronix calibration files into the new JSON format.
For a magnetic sensor the .json should contain:
"units_frequency": "Hz",
"units_amplitude": "mV/nT",
"units_phase": "degrees"
For a MFS-06xx chopper on you typically have f, a, p: 0.1, 20.0, 89.0
chcal -help
gives you more options you don’t need.
An old metronix file MFS06022.TXT
is split into MFS-06_0022_chopper_off.json
and MFS-06_0022_chopper_on.json
.