== SDC4	Thermal background == 

- **Phase**		:	Any  
- **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.

**Templates**

**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**

**Date performed and by whom**