``magnet_calibration``
======================
provides a graphic user interface which allows to calibrate the B-field vs. current of the electromagnet. 

.. image:: _static/magnet_calibration.jpg
  :alt: screenshot of the magnet_calibration gui
  :width: 600

Input parameters are:

* I_min: minimum of the measurement current (should be above -4 A) 
* I_max: maximum of the measurement current (should be below  4 A) 
* step: stepsize (in A) in the applied current I during the calibration measurement  
* loops: number of measurement loops
* B_min: minimum of the plot range in mT  
* B_max: maximum of the plot range in mT 
* filename: name of the file in which the data is stored 

Available buttons:

* start: starts the measurement	(always available)
* pause: pauses the measurement (only available during the measurement)
* select path: selects the directory where the data is saved (always available)
* save data: saves the data (only available after a measurment is finished)

The program saves the data in the following format::

	# I (A)	 Bup(mT) 	 Bdown (mT)
	-4.00	703.80	704.36
	-3.90	697.09	696.50
	-3.80	689.92	688.27
	-3.70	682.31	679.57