MIL-B-18F
TABLE VIII. Sample size and acceptance number for each capacity test.
Acceptance number 1/
Contract lot
Sample size "n" for
size "N"
each capacity test from
T and D tests
contract lot
0 to
110
5 2/
--- 2/
111 to
500
15
3
501 to
800
25
5
801 to 1,300
35
7
1,301 to 3,200
50
9
3,201 to 8,000
75
13
8,001 to 22,000
110
18
22,001 to 110,000
150
24
over 110,000
225
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1/ When the number of capacity values, falling below the minimum requirements specified (see 3.1) for a
given test, is equal to or less than the associated acceptance number, the contract lot from which the
sample was drawn has met the requirements of that test.
2/ Determination of compliance, specified in 4.6.1.4.2, shall not apply to contract lot-sizes less than 111.
4.6.1.4.1.1 Smaller-than-shipment (sub-shipment) lots. At the option of the contractor, selection of sample
batteries (see 4.6.1.4.1) may be made on a smaller-than shipment (sub-shipment) lot basis. In such case, the sample
size for the sub-shipment lot shall bear the same ratio to the sample size for the shipment lot as the sub-shipment lot
bears to the shipment lot.
4.6.1.4.1.2 Allocation of sample batteries for group C inspection. The number of batteries ns, selected from a
shipment lot (see 4.6.1.4.1), shall be assigned at random for group C inspection as follows:
The quantity of batteries ns in the sample of the first shipment lot shall be selected at random and assigned to
a.
the capacity tests. The first battery shall be assigned to the T test, and the second one to the D test. This
sequence of assignment of sample batteries to the two capacity tests shall be resumed in each succeeding
shipment lot at the same point at which it ended in the previous shipment lot.
b.
The assignment of batteries to capacity tests shall result in the allocation of exactly n batteries to each of the
two capacity tests after the final shipment on the contract lot is made. If necessary, the sample size ns taken
from the last shipment lot of a contract lot shall be adjusted so that this result is achieved.
4.6.1.4.2 Determination of compliance. The entire contract lot shall be considered as complying, when the T test
results show compliance. To determine whether the contract lot conforms to the specified T test requirements, the
number of batteries in the sample with capacity values below the minimum capacity value (SLT) specified in 3.1, shall
be compared with the acceptance numbers for sample sizes n in table VIII. When the number for a given test is less
than or equal to the corresponding acceptance number, the contract lot complies with the requirements of the test.
When the number is greater than the acceptance number, the contract lot does not comply.
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