MIL-DTL-8971F
TABLE I. Electrode accuracy criteria.
This procedure shall be used to determine if electrodes pass accuracy requirements.
First, use the following formula to calculate the Accuracy Index (AI) for each element at each
applicable concentration level for both the candidate and the reference electrodes (see 3.9 and
4.6.2.6):
AI = X - Y , [Absolute value of ( X - Y)],
where X is the mean of the test results of N analyses (normally 10) in ppm and Y is the elemental
concentration in the oil calibration standard solution in ppm. Second, compare the AI value for
the candidate electrodes to the corresponding value tabulated below. Third, if needed, statistically
compare the AI values of the candidate and reference electrodes using a t-test (see 4.6.2.6b).
If the candidate electrodes' AI value is equal to or less than the tabulated value, or if the statistical
comparison between the AI values indicates the candidate electrodes are equal to or better than
the reference electrodes, then the candidate electrodes pass the accuracy requirement for an
element at a specific concentration.
To pass the accuracy requirements for this specification, the candidate electrodes must pass the
accuracy requirements for all elements at all applicable concentrations.
Al, Cr,
Ag &
Cu &
Y
Fe
Ni,
Na
Pb
Sn
Ti
B
Zn
Mo
Mg
& Si
5
1.50
1.50
1.20
1.61
2.59
1.98
1.98
1.30
1.30
1.99
30
5.23
5.23
3.33
5.91
11.60
4.47
4.47
3.93
3.93
8.15
100
16.00
16.00
9.65
18.20
37.10
12.20
12.20
11.70
11.70
25.60
300
46.70
46.70
27.80
53.50
110.00
34.30
34.30
33.90
33.90
75.60
N/A1
500
77.50
46.00
88.80
183.00
56.60
56.60
56.10
56.10
126.00
900
139.00
N/A
N/A
159.00
328.00
101.00
N/A
N/A
101.00
226.00
1
N/A = Not Applicable
6
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