2. Measurement Process Characterization
2.3. Calibration
2.3.4. Catalog of calibration designs
2.3.4.7. Humidity standards

2.3.4.7.1.

Drift-elimination design for 2 reference weights and 3 cylinders

 OBSERVATIONS   1   1   1   1   1


     Y(1)       +   -
     Y(2)                   +   -
     Y(3)               +   -
     Y(4)           +   -
     Y(5)       -               +
     Y(6)       -           +
     Y(7)               +       -
     Y(8)           +       -
     Y(9)           -           +
     Y(10)      +       -


 RESTRAINT      +   +


 CHECK STANDARD +   -


 DEGREES OF FREEDOM = 6


                         SOLUTION MATRIX
                          DIVISOR  =  10

 OBSERVATIONS      1      1      1      1      1


    Y(1)           2     -2      0      0      0
    Y(2)           0      0      0      2     -2
    Y(3)           0      0      2     -2      0
    Y(4)          -1      1     -3     -1     -1
    Y(5)          -1      1      1      1      3
    Y(6)          -1      1      1      3      1
    Y(7)           0      0      2      0     -2
    Y(8)          -1      1     -1     -3     -1
    Y(9)           1     -1      1      1      3
    Y(10)          1     -1     -3     -1     -1
    R*             5      5      5      5      5

    R* = average value of the two reference weights


 FACTORS FOR REPEATABILITY STANDARD DEVIATIONS 
   
 WT    K1      1   1   1   1   1
  1  0.5477                    +
  1  0.5477                +
  1  0.5477            +
  2  0.8944            +   +
  3  1.2247            +   +   +
  0  0.6325    +   -          

Explanation of notation and interpretation of tables