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MODELS |
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| LVDT Conditioner Module |
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Model 5D30 / 5D30V | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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The Models 5D30 and 5D30V are high-reliability conditioners for measurement of displacement, force, pressure, and other parameters obtained with a linear variable differential transformer (LVDT) or other variable transformer transducer. The 5D30 delivers filtered analog output of ±5 VDC, while the 5D30V produces ±10 VDC. Based on the synchronous carrier-demodulator principle, both models can handle a remarkably wide range of signals (from 16 to 4000 mV/V, full scale)—with no special "long-stroke" cabling required for high-output sensors. Three selectable operating frequencies are provided to best match the user's specific transducer. Exceptional signal stability and accuracy over the entire input range are achieved through
Powerful low-pass active filtering is independently selectable for each 5D30(V) analog output (see General 5D Series Specifications), for removal of unwanted high-frequency measurement-signal components and the elimination of aliasing errors, if the module's output is subsequently sampled. For both the Model 5D30V and the Model 5D30S (the "S" Option version of the Model 5D30), a 10-pin header for a Phoenix Style screw-terminal connector replaces the Model 5D30's standard DB25 connector for the module's power, configuration, logic, and analog output wiring. Ensuring secure cable connections to individual 5D modules, these versions are intended primarily for single-point or single-mount module applications. Since the logic "enable" line is not provided in this case, both analog outputs are continuously available for both the 5D30V and the 5D30S.
Advanced Linearity and Negative Symmetry Correction for Transducers That May Require It The 5D30(V) can easily accommodate sensors that exhibit typical nonlinearity and/or asymmetry (as shown in the figures below). By applying simple software commands, you can fit the output curve to your linear, symmetric "ideal." (NOTE: The 5D30(V)'s LINEARITY POSITIVE (LNP) and LINEARITY NEGATIVE (LNN) commands are for entry of a midscale correction in the positive and negative domains, respectively. The linearity improvement furnished here is useful in cases where the output linearity error increases and decreases smoothly—with no inflections—with increasing values of input, as is commonly the case with conventional LVDT sensors.)
Internal "Absolute" Calibration Coupled with High-Accuracy "Two-Point (Deadweight)" Calibration Because of normal cable loading effects, it is a practical necessity to calibrate any LVDT/CABLE/INSTRUMENT system after installation, using a known input standard. The "absolute" calibration provided by the 5D30(V) normally yields a very good first approximation. Conventional "zero and span" calibration may then be easily performed—with the module fully "in place"—using the Configurator software supplied with the module. This procedure includes any necessary phase-shift compensation, symmetry trimming, and midscale linearity adjustments. When calibrated "in place," the 5D30(V) offers excellent stability and interchangeability of units. As long as an initially calibrated 5D30(V)'s setup configuration is exactly transferred to the 5D30(V) that replaces it, no recalibration is usually required to maintain the stated accuracy (see Specifications).
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