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Model 10A30-2C
 Dual LVDT Conditioner

Input Type Description SPS6000 SPS8000 System 10
Distance, Displacement, Angle Dual LVDT
 X*X
 X*X
 X*X


This conditioner is for measurement of displacement, force, pressure, and other parameters obtained with a linear variable differential transformer (LVDT) or variable reluctance transducer.

Based on the synchronous carrier-demodulator principle, it supplies regulated, remotely sensed AC excitation for two independent transducer channels.

It then demodulates, filters, and amplifies the resulting signals to produce system outputs precisely proportional to LVDT core displacement. The 10A30-2C automatically adjusts to the signal phase shift of the transducer in use, thereby insuring optimum sensitivity and linearity. Special input provisions exist for "long-stroke" LVDT's (full-scale range of ±1 inch or greater).

By providing two input channels, the 10A30-2C allows direct measurement of thickness (when the two inputs are summed, as in Fig. 1) or of taper (when their difference is calculated).

10A30-2C data channels are normally calibrated by a conventional "two-point" ("deadweight") technique in all three systems- although in SPS6000, software-based "calculated" calibration is also available. When used in System 10, the 10A30-2C employs a special "two-point" procedure involving the ZERO OFFSET (BEE) command. Custom linearization of nonlinear LVDT signals is also available for cards used in System 10 (only), with up to 8 internal look-up tables, up to 58 segments each, plus easy-to-use LinPAC V software for creation/editing, loading, backup, and restoration of linearization tables.

Specifications:
  • Transducer Types: 5- or 7-wire LVDT’s capable of 3280-Hz operation and having primary impedance of 80 ohm or greater (all Daytronic LVDT transducers are suitable); 3- or 5-wire variable reluctance transducers
  • Sensitivity Range: Accommodates full-scale ranges from ±0.010 in. (±0.25 mm) to ±6.0 in. (±15.24 cm), when used with Daytronic or equivalent transducers:
      Standard Input (rms, full-scale): 78, 156, or 312 mV/V
      Long-Stroke Input (rms, full-scale): 525 mV/V, 1.05 V/V, or 2.10 V/V
  • Excitation (per channel): Nominal 3.0 V-AC (rms) at 3280 Hz; 40 mA (rms), maximum
  • Amplifier (per channel):
      Common-Mode Range: ±5 V operating; ±12 V without instrument damage
      Common-Mode Rejection Ratio: DC and at 60 Hz: infinite; at 3 kHz: -60 dB
      Input Impedance: Differential: 400 k-ohm; Common-Mode: 100 k-ohm
      Offset: Initial: ±3% of full scale; vs. Temperature: ±20 ppm/°C; vs. Time: ±0.01% of full scale/month
      Gain Accuracy: ±0.02% of full scale typical, following calibration*
      Gain Stability: vs. Temperature: ±50 ppm/°C; vs. Time: ±20 ppm/month
  • Filter (per channel): 3-pole modified Butterworth; 3 dB down at 6 Hz; 60 dB down at 60 Hz
      Step-Response Settling Time (Full-Scale Output):
      To 1% of final value: 250 msec
      To 0.1% of final value: 400 msec
      To 0.02% of final value: 500 msec
  • Auxiliary Outputs: Filtered outputs available on wire-wrap pins
    *Initial (uncalibrated) inaccuracy may be as great as ±3% of full scale (see "Accuracy Specifications"). Maximum error that could occur upon replacement of a Model 10A30-2C not followed by calibration is ±6% of full scale.


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