Downloaded from https://www.everyspec.com AMCP 70-198 Table A-2 is arranged according to the type If the first digit Is a 1, then this specifies of test - altitude, temperature, temperature/ i s,0('O ft altitude, whoreas a 6 represents altitude, vibration, shock, and humidity, 100,000 ft. In this way, 10 different en. Along with quickly spotting a specific re- vironmental parameters are represented in quirement for a specification, varioue specifi- the code (see Fig. A-I). cations for similar tests can be compared. If complete deta. needed, then consult the Ile Environmental Code Table (Table A-3) applicable document.
Table A-2 makes this lists the variotus levels for each parameter a- even easier by giving the specific paragraph in long with the corresponding code number, It the specification that has the needed infor- addition, the test methods for parts are listed mation. as per MIL-STD-202. These methods are not ,-3 ENVIRONMENTAL CODE: A SHORT. the only ones to be used since different CUT TO P•CIFICATIONS (REF. 2) parts and equipments use different Military Specifications, some of which are shown in Military Specifications describe, often at Table A-4.
In general, an item to be coded great length, the envlronmental parameters should be tested according to !ts relevant of military electronic parts and equipments, specification. Since it is the document most Thewe detailed requirwments are needed to commonly used in evaluating electronic parts, ensure accuracy, but they are difficult to MIL-STD-202 it the basis for EC. record and to compare. A short, simple method of specifying the exact parameters is Occaaionaliy the levels in Military Specifi- presented. cations are slightly different from the levels in EC.
In that case, the deviation is indicated The Environmental Code (EC) consists of by an asterisk next to the appropriate code a 10-digit number, The position of each number. For example, MIL-E-16400F digit defines a specific parameter, while the specifies the temperature + 500C, while value of the digit represents a particular level MIL-es4158C specifise + 520C. Both of these of that parameter. temperatures would be represented by a I For example, the first digit always repre- in the second position of the EC, indicating sents altitude, the second represents high.
that the temperature is close to, but not operating ambient temporature, and so forth, exactly, + 55'C' HIGH AMBIENT TEMPERATURE COAoeION LOWAMBIENT MOISTURE FLAMMABILITY I AT'r TEMPERATURE RESISTANCE IXPLO IVINEUS VBA IONJ L OCK (ORI(YLs LIFE LIFP Figure A. 1. The Environmental Code (EC)W A4.