Includes the tape and recorder/reproducer characteristics and modes of recording to enable users of different systems to interchange information recorded on instrumentation magnetic tape. Annexes A, B, C, D, and E contain recommended procedure for testing recorder/reproducer systems, magnetic tape recorder/reproducer information and use criteria, additional nates for the testing of magnetic tape recorder/reproducer, PCM standards - additional information and recommendations -, and use criteria for frequency division multiplexing, respectively.