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Home » Products » Rotary and Tilt Sensors » DC RVDT » DC Operated, Light Weight RVDT

DC Operated, Light Weight RVDT

DC Operated, Light Weight RVDT
DC Operated, Light Weight RVDT
Product Code : R30D
Product Description

The R30D RVDT (Rotary Variable Differential Transformer) is a DC operated non-contacting rotary position transducer. Integrated signal conditioning enables the R30D to operate from a bipolar +15 VDC supply, and provide a high level DC output that is proportional to the full angular sensing range of the device. Calibrated for operation over +30 degrees, the R30D provides a +/-3.75VDC output, with a non-linearity of less than +0.25% of full range. Extended range operation up to a maximum of +60 degrees is possible with increased non-linearity. Internally, the DC supply voltage is converted into an AC carrier signal which excites the primary coil of the sensor. An integrated demodulator amplifier with low-pass filter converts the differential secondary output into a smooth, high level, linear DC output signal relative to the angular position of the shaft.

High reliability and performance are achieved through the use of a specially shaped rotor and wound coil that together simulates the linear displacement of a Linear Variable Differential Transformer (LVDT). Non-contact electromagnetic coupling of the rotor provides infinite resolution thus enabling absolute measurements to a fraction of a degree. The R30D features a rugged aluminum size 11 housing making this rotary position sensor ideal for applications where integrated signal conditioning and small size are required. Also see our other angular position sensor models, R60D (+60o, bipolar DC operation), RVIT-15 Series (single ended DC operation, voltage or current output), R120LC (+5VDC operation, low cost) and R30A/R36AS (AC operation).

Electrical Specifications :

Angular range, degrees

+30o (standard)



Non-linearity, % of FR, max.




Output at range ends





0.125 V/degree

Temp coefficient of sensitivity

0.04%/oF [0.07%/oC], over operating temperature range

Input voltage

+/-15VDC +10%

Input current

25mA maximum

Output current


Output impedance

1 Ω maximum

Frequency response

500Hz @ -3dB

Environmental And Mechanical Specifications :

Operating temperature

0oF to +158oF [-18oC to 70oC]

Storage temperature

-67oF to +257oF [-55oC to 125oC]

Mechanical angular range

360 degrees (no stops)


Shielded ABEC 3 precision

Shaft diameter

3/16 inch [4.76mm]

Housing material

Aluminum, anodized


Size 11 servo mount BU-ORD

Moment of inertia

0.53 x 10 [0.61 x 10 ]

Maximum torque, unbalance

0.004 inch.ounce-force [0.3]

Maximum torque, friction

0.015 inch.ounce-force [1.1]

Shaft load capability

10 lb [4.5Kg] Axial; 8 lb [3.6 Kg] Radial

Electrical connection

4 lead wires, 28AWG , PTFE insulation, 12 inches [30cm] long


1.9 oz [54 grams]


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