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MIL-M-28787/128 Revision B, May 4, 1979
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Includes all amendments and changes through Cancellation Notice 3, August 13, 2013
Additional Comments: CNCL NO S/S
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This document establishes the requirements and test procedures for the procurement of an electronic transformer module.

The following electrical parameters reflect the 0° to 60°C end-of-life limits from table I.
   Name                                               Transformer

   Family                                             Analog

   Key code                                           CTR

   Size                                               1E

   Weight                                             454 grams maximum

   Failure rate                                       0.983 failures/106 hours maximum

   Environment                                        Class I as specified in MIL-STD-1389

   Maximum power dissipation                          10 mW

   Rated input voltage                                30 Vrms, 9.6 kHz

   Maximum working voltage                            85 Vp-p

   Transformer ratios                                 1:1 ±0.25 percent
     (primary to secondary)
         Tap 1                                        1:0.975 ±0.125 percent
         Tap 2                                        1:0.950 ±0.125 percent

         Tap 1                                        1:0.500 ±0.125 percent
         Tap 2                                        1:0.284 ±0.125 percent
         Tap 3                                        1:0.229 ±0.125 percent
         Tap 4                                        1:0.179 ±0.125 percent
         Tap 5                                        1:0.100 ±0.125 percent
         Tap 6                                        1:0.0179 ±0.50 percent
         Tap 7                                        1:0.0156 ±0.50 percent

   Phase shift                                        0 ±0.25 degree

   Harmonic distortion                                1 percent maximum

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Electronic Systems Command, ATTN: ELEX 5043, Department of the Navy, Washington, D.C. 20360 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

   Frequency response                                 ±3 dB, 400 Hz to 100 kHz

   DC resistance
     Primary                                          41.09 ohms maximum
     Secondary                                        41.09 ohms maximum

   Continuous load power                              0.025 W per transformer

This module contains two general purpose transformers which are identical but electrically isolated. Each transformer has one primary with two taps and one secondary with seven taps. There is an electrostatic shield between the primary and the secondary of each transformer.