FED-STD-228A
5. RESULTS
5.1 Calculation.
5.1.1 The resistance of the armor per 100 feet shall be calculated as follows:
Resistance, ohms per 100 feet=R x 100
L
where:
R = the resistance of the specimen between leads at test temperature, ohms.
L = the length of the specimen between leads, feet.
5.1.2 Resistance measurements made at temperatures other than 20°C shall be corrected to 20°C as
follows:
Resistance at 20°C., ohms= _______
R______________________
1+0.00393 N (T-20)
where:
R = the resistance of the specimen at test temperature, ohms
T = the temperature of test, °C.
*N=the temperature coefficient of resistance of the armor metal relative to soft copper
*When N is not known, the test shall be conducted at 20°C.
5.2 Unless otherwise specified in the detail specification, one specimen from each inspection unit shall
be tested.
5.3 The resistance of the armor of the inspection unit shall be the results obtained from the specimen
tested.
5.3.1 When more than one specimen is tested from each inspection unit, the resistance of the armor
shall be the average of the results obtained from the specimen tested.
5.4 The resistance of the armor of the inspection unit in ohms per 100 feet shall be recorded to the
nearest 1 percent.
163
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business