caibration of ADXL213

Question

hi, 
 what is the procedure for calibration of ADXL213 for angle measurment, 
 is ther any standard procedure, 
 also , 
 is there any diference in output of following 2 formule 
 1> 
 Acceleration = ((t1/t2) – Zero g Bias)/Sensitivity 
 Where in the case of the ADXL213 
 Zero g Bias = 50% nominal 
 Sensitivity = 30%/g nominal 
 t2 = RSET/125 MΩ 
 2> AOUT [g] = AOFF + (Gain × AACTUAL) 
 where 
 AOFF [g] = 0.5 × (A+1g + A−1g) 
 Gain = 0.5*((A+1g - A−1g)/1g

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caibration of ADXL213