MIL-DTL-23919C(SH)
3.3.4 O-rings. O-rings for the hub of the base assembly shall be circular rubber rings conforming to
SAE-AMS-P-83461. Sealing grease for installation of the O-rings shall conform to SAE-AS8660.
3.3.5 Fasteners. The fasteners used to attach the assembly to the structure to be protected shall be made from
corrosion-resistant material, preferably nylon.
3.4 Performance requirements.
3.4.1 Accuracy/offset. Performance A cells shall have a normalized measurement within ±10 millivolts DC
compared to the E244 In-Vivo Metric (IVM) standard reference cell, or equivalent standard cell. Performance B cells
shall have a normalized measurement within ±4 millivolts DC as compared to the model E244 IVM standard reference
cell, or equivalent cell. Additionally, the difference between the maximum and minimum potential values of all
Performance B cells being tested shall not exceed 2 millivolts (see 4.5.2).
3.4.2 Additional requirements for performance B cells.
3.4.2.1 Stability and static drift. For Performance B reference cells, the maximum change between any two
reference cell elements shall not exceed 0.6 millivolt DC under constant environmental conditions over 14 days
(see 4.5.3).
3.4.2.2 Temperature linearity. For Performance B reference cells, the maximum absolute difference in slope
between any two reference cell elements shall not exceed 0.035 millivolt DC/°F when tested at temperatures from 40
to 90 °F over 336 hours (see 4.5.4).
3.4.2.3 Water resistivity linearity. For Performance B reference cells, the maximum absolute difference in slope
when plotted on a semi-log graph between any two reference cell elements shall not exceed 0.03 millivolt
DC/log(ohm-centimeter) when tested at water resistivities between 18 ohm-centimeters and 288 ohm-centimeters
(see 4.5.5).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
First article inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 First article inspection. When a first article sample is required (see 3.1), inspection shall be performed on
three sample reference cells of each style of configuration. This inspection shall include all tests of 4.5.
4.3 Conformance inspection. Conformance inspection shall include the tests of 4.5.1 to 4.5.5 and 4.5.7 to 4.5.10.
4.3.1 Lot. For the purpose of sampling, a lot shall consist of those reference cells of each specified classification
from the same production run offered for delivery at one time. However, this lot shall not exceed 200 prepared
reference cells.
4.3.2 Sampling for examination. From each lot specified in 4.3.1, a minimum of three cells shall be tested,
including one of any unique configuration (see table I).
TABLE I. Sampling for examination.
Lot size
Sample size
3-25
3
26-50
5
51-90
6
91-200
7
4
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