MIL-M-28787/128 Revision B, May 4, 1979
MODULES, STANDARD ELECTRONIC TRANSFORMER, ANALOG, KEY CODE CTR
Includes all amendments and changes through Cancellation Notice 3, August 13, 2013
Additional Comments: CNCL NO S/S
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) Primary Tap 1 1:0.975 ±0.125 percent Tap 2 1:0.950 ±0.125 percent Secondary 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.