Hybrid Modules For Signal Conditioning
Hybrid thick modules for incorporation on to PCBs containing all necessary circuitry to obtain the best performance from high quality ac type LVDT transducers
Technical Specification for Oscillator
Drive frequency
5, 10 or 15Hz (nom)
1 to 20kHz by 2 additional resistors
Drive current
50mA rms (max)
Amplitude temp. Coefficient
0.004%/°C typical
Amplitude Control
Remote sense facility
Protection
Open & short circuit
Technical Specification for Demodulator
Sensitivity (9 gain ranges)
2.5 to 3.75mV rms input for 5V dc output
Range to zero
±30% fine,±100% coarse
Temp. Coefficient
Zero 0.003%/°C (typ),
Gain 0.004%/° (typ)
Output impedance
Non-Linearity
Mounting
Conformal coated sil package
Dimensions ( L x T x H) (mm)
52 x 5 x 12 (20 pin on 0.1 pitch)
Operating Temp. (°C)
0 to +70
Weight (g)
3.3
Approvals
RoHS
Supplied with
full instructions and application examples.
Linear Variable Differential Transformers (LVDT)
These devices comprise a movable nickel iron core and three coils - one for energisation and two for pick-up. They need to be driven by a sine wave to produce an output amplitude and phase directly proportional to the position of the core with respect to the pick-up coils. A phase sensitive detector is required to demodulate the output signal. The main advantages of LVDTs are;
No wear problems as with potentiometers
Infinite resolution, high accuracy and linearity
No friction introduced into the measured system
Available in ranges from ±1mm to ±50mm
Note
RS LVDT's datasheet Stock No. 232-4049 is available on request.
