scope:

This document establishes the requirements and test procedures for the procurement of an electronic resolver transformer module.

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

Name Transformer, resolver Family Analog Key code PTF Size 1A Weight 35 grams maximum Failure rate 0.032 failures/10⁶ hours maximum Environment Class I as specified in MIL-STD-1389 Individual transformer description: Frequency 390 to 820 Hz Dielectric withstanding 200 ±15 Vdc Transformer ratio 0.29661 ±0.00296 (11.8 : 3.5) 0.08475 ±0.00085 (11.8 : 1.0) Regulation 0.1% from no load to 50 kΩ resistive load Phase shift 0° to 0.1° (50 kΩ load) Input impedance (V_I = 11.8 Vrms) 70 kΩ minimum at 400 Hz 100 kΩ minimum at 800 Hz Input voltage 11.8 Vrms ±10%

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.

Individual transformer description: -Continued Angular error 0.008° maximum Clamping circuit voltage ±10 Vpk Quadrature - Full winding ±1.0 mV Tap ±0.5 mV

The resolver transformer module, designated as key code PTF, is a Standard Electronic Modules Program (SEMP) electronic module with 0.100 inch (2.54 mm) grid center contacts. This module contains two 390 to 820 Hz transformers which convert 11.8 Vrms resolver signals to 3.5 and 1.0 Vrms resolver signals. Each secondary circuit has two suppression circuits to limit output transients to ±10 Vpk.