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  DC-Operated,
Short-StrokeUnguided Armature |
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"SU" LVDT Series (DC) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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These are the standard DC-EXCITED SHORT-STROKE LVDT models with UNGUIDED ARMATURE. For "SU" models with ±5 or 0-10 VDC output, see the "SU5" High-Voltage LVDT Series. For hermetically sealed versions, see the DC "SUM" LVDT Series. They have integral electronics for operation from simple, well regulated DC power supplies of between 6 and 12 V, without the need for external instrumentation. These units use the same linear variable differential transformer (LVDT) principle as the AC-excited transducers, but include an oscillator to energize the primary winding. The resulting signal from the secondary windings then passes through a demodulator, converting it to a DC output. A simple RC filter is also included, to remove most of the noise from the demodulated output. Further noise reduction can be achieved through simple capacitance connections, although this will slow down the response of the transducer to fast-changing mechanical inputs. For optimum speed, the filter may be bypassed entirely. Also, an internal load resistor can be introduced into the LVDT circuit for calibration purposes. (Factory calibration of the small DC-DC transducers is carried out with the internal 22-kΩ load connected and the output voltage measured across the filtered output. If it is required to make direct use of the calibration value quoted for a particular transducer, then the same conditions have to be met and a high-impedance measuring device should be used, such as a DVM, oscilloscope, etc.). General Specifications are given below.
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