C-Star Calibration Sheet

Date:			May 4, 1999
Customer:		MBARI 
Serial Number:	CST-260PR	
Model Number:	9904010	

Vd = V dark			0.059	
Vair = V out in air		4.822	
Vref = V out in H2O		4.703
Calibration Temp of H2O	24.2
Ambient Temperature		22.1

% Transmission = (Vsig-Vd)/(Vref-Vd)
Tr = e-cx
To solve for the attenuation coefficient c in units of m-1 use the following equation.
c = -1/x (ln(Vsig-Vd)/(Vref-Vd))
For further information on these calculations please see C Star Users Guide section 1.

Temperature Error: 0.02% F.S./C 

NOTES
•	(Vd ) is the analog output of the instrument with the beam blocked. This is an instrumental offset.
•	(Vair ) is the analog output voltage of the instrument with a cleared beam path. 
•	(Vref ) is the analog output voltage of the instrument with clean H2O in the path.
•	(Calibration Temp of H2O) is the temperature of the clean H2O used to obtain Vref . 
•	(Ambient Temperature) is the temperature of the instrument during the calibration procedures.
•	(Vsig) is the measured signal voltage of the C Star.