Synchro-resolvers: These are electromechanical angle to ratio devices used in many aircraft control systems. Because of this important application, the operation with high accuracy is needed to test usually.
The chart below is the testing configuration include: Conference, resolvers, Ratio Transformer (Tegam model PRT-73), Phase angle meter (Clarke-Hess model 2600)
Testing Procedure
The setup above only works for angles 0 ~ 45˚ and 180 ~ 225˚. Other angles can still be tested by changing the resolver output connections as the table below:
NM: Input of Null Meter
C: Input Common of the ratio transformer
RT: Input of the ratio transformer
Angle |
S1 |
S3 |
S4 |
S2 |
0 to 45 |
NM |
C |
RT |
C |
45 to 90 |
RT |
C |
NM |
C |
90 to 135 |
RT |
C |
C |
NM |
135 to 180 |
NM |
C |
C |
RT |
180 to 225 |
NM |
C |
RT |
C |
225 to 270 |
RT |
C |
NM |
C |
270 to 315 |
RT |
C |
C |
NM |
315 to 360 |
NM |
C |
C |
RT |
Main Features and specifications of instruments in the system
Ratio Transformer: PRT – 73 (Tegam)
Phase Angle Voltmeter: 2600 (Clarke-Hess)
Source: TMC