Nidec Copal JT22 Single-turn Optical Contactless Potentiometer

JT22 Contactless configuration offers much longer life and lower noise compared with the conventional contact method.

Potentiometers are displacement sensors that produce electrical output (voltage) in proportion to the mechanical displacement. They are basically composed of a resistor and a wiper (brush), with the mechanical displacement of the resistor relative to the wiper being accurately converted into electrical voltage output. A voltage is applied to both ends of the resistor, and the wiper is moved. The displacement is measured by the voltage between one terminal of the resistor and the wiper. Looking at the component structurally, we can see the following: (Fig. 1) Further, the following formulas apply to the voltage output



Nidec Potentiometer

Model of potentiometer

Wirewound Type

Precision wire winding technology has been used to achieve low noise and long life. Wirewound types include the single turn J series for use in servo drives and the multiturn M series for use in setting.

Conductive Plastic Type

Special film resistors and original contact construction provide long life, with degradation that is theoretically infinitely small. Conductive plastic types include single turn types and linear types, both for use in servo drives.

Cerment Type

The use of cermet resistors allows low price. The degradation is theoretically infinitely small. Cermet tyeps are single turn for use in servo drives and for setting.

Optical Contactless Type

Contactless configuration offers much longer life and lower noise compared with the conventional contact method.

Optical Contactless Principle

Optical contactless potentiometers shall detect rotational angle at time of shaft rotation by positioning sensor which photo-electrically transfers the displacement of light transmitted through spiral slit that is placed between luminous element and positioning sensor


  • Contactless configuration offers much longer life
  • Low torque 0.147 mN·m {1.5 gf·cm} maximum
  • Superior temperature characteristic due to temperature compensation circut incorporated
  • Wide effective electrical angle (120° • 320°)
  • RoHS compliant


Nidec Copal Electronics’ products are widely used in various applications, mainly in industry.

  • Vehicle, Construction machine
  • Medical equipment
  • Analytical / Messuring equipment
  • FA equipment
  • Residential facility, Security
  • Social infrastructure, Commercial tool, etc.


Electrical characteristics

Input voltage 5 ± 0.25 VDC 12 ± 0.6 VDC
Dissipation 40 mA maximum
Effective electrical angle 120° 320° 120° 320°
Output voltage +0.5 ~ +4.5 V
Absolute linearity ※1 ± 3.0 %
Temperature sensitivity ± 3.0 %FS (± 2.0 %FS/-30~70 °C)
Temperature medium drift ± 40 mV
Insulation resistance 100 MΩ (at 500 VDC) minimum
Dielectric strength 500 VAC (1 min)

※ 1 At normal temp.

Mechanical characteristics

Starting torque 0.147 mN·m {1.5 gf·cm} maximum(at normal temp.)
Maximum rotational speed 1500 min-1
Mechanical angle 360° continuous
Rotational life 1 X 108 revolution(at 25 °C, 200 min-1)
Vibration 147 m/s2  {15 G} 30 ~ 200 Hz, 30 h
Shock 294.2 m/s2  {30 G} minimum
Strength of tighten screw 0.49 N·m {5 kgf·cm} maximum

Environmental characteristics

Operating temp. range − 30 ~ 80 °C
Storage temp. range − 30 ~ 85 °C
Humidity Relative humidity 95 % maximum
Net weight Approx. 12g
Protection grade IP40


Datasheet: Nidec Copal JT22 Single-turn Optical Contactless Potentiometer

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