Ratiometric signal conditioner for LVDT and RVDTs
TE Connectivity’s LVC-4500 LVDT/RVDT ratiometric signal conditioner supports both constant sum and standard ac linear variable differential transformers (LVDTs) and rotary variable differential transformers (RVDTs). The LVC-4500 ratiometric signal conditioner provides voltage, current, and digital RS-485 outputs that can be used for different requirements or based on user preferences. With the use of the RS-485 port, a host computer is able to retrieve measurement data, receive operational status, perform remote calibration, and perform hot swap reconfiguration where the calibration settings can be digitally uploaded. The standalone signal conditioner can measure the secondary voltage difference over the sum (Va-Vb)/(Va+Vb), supporting ratiometric AC LVDTs and RVDTS with a constant sum of secondary voltages.
Ratiometric signal conditioning is designed to improve an LVDT sensor’s performance during temperature variation. By minimizing the thermal error of the position sensor, ratiometric signal conditioning allows for a longer cable run between the signal conditioner and LVDT. As a result, the LVC-4500 ratiometric signal conditioner is suited for use with LVDTs in extreme conditions that have high temperature variations and require cable runs in excess of 100 feet between the LVDT and signal conditioner.
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