== P3.24	Thermal background == 
•	**Phase**		:	3  
•	**Status**		: 	Draft	 
•	**Category**		: 	Daytime calibration (C3)
•	**Recurrence**	: 	once every month starting from commissioning.
•	**Duration**		: 	1 hour(s)
**Description**
•	Measure the instrument background and seasonal variations.
**Prerequisites**
**Procedure**
•	This calibration is performed by reading the detector without any light
•	CI BB_H, DIT=1800s, NDIT=2.
**Success criteria**
•	Accuracy of 1.2 e-/pix (FWHM of the distribution of a difference of backgrounds). 
**Notes**
•	Same as activity 9.1 in AD4
**LBTO support**
•	Support from LBTI/LBTO?
**Associated SHARK-NIR personnel**
•	JF, LM, MdP
**Date performed and by whom**