![]() Default data output is 9600, 8 bits, no parity, and one stop bit (9600, 8, N, 1). Table 3 (on the data sheet) defines the switch position for the available baud rates.Engineers now can use VXI to characterize and evaluate system performance in critical areas such as avionics, radar positioning and fire-control systems on tanks. The ability to measure output signals of synchros and resolvers, which are used for position feedback in such applications, is essential for accurate test and evaluation. To support the growing demand for VXI-based test implementations, synchro/resolver measurement and simulation instrumentation now is available in VXI. The register-based VXI cards offer accuracies extending to 18 arc seconds. They also provide dynamic capability by simulating a rotating synchro/resolver.Ī synchro or resolver functions as an electro-mechanical transducer which is essentially a rotary transformer ( Figure 1). A synchro consists of a rotor input (R1 and R2) and three stator windings (S1, S2 and S3) which are wound physically 120(degree) apart. ![]() Synchros are commonly used on shipboard applications to transmit position information from one area of the ship to another. When synchros are used on aircraft, the S2 output is usually grounded, eliminating the need to run the third output wire. Resolvers consist of a rotor input (R1 and R2) and two stator windings, wound physically 90(degree) apart as shown in Figure 1. ![]() A reference oscillator is connected to the rotor to provide excitation. The outputs of each stator winding are sinusoidal waveforms whose magnitudes are proportional to the sine and cosine of the angle of rotation of the shaft. Synchros and resolvers can operate with input voltages from 0.5 to 115 Vrms over frequencies ranging from 60 Hz to 100 kHz. ![]() Some standard rotor voltages are 26 Vrms, producing 11.8 V line-to-line, or 115 Vrms, producing 90 V line-to-line. The synchro/resolver output signals may be converted to digital. ![]()
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