DC Tachometers

Servo-Tek tachometer generators (also caleed tach generators) provide a convenient means of converting rotational speed into an isolated analog voltage signal suitable for remote indication and control applications.

Combining high accuracy with low driving torque, Servo-Tek tach generators are ideal for use in servo systems.  

Tach Generators are particularly suited to application in precision integrators and velocity servos, both of which require a highly linear speed/voltage relationship with minimum ripple.  

DC Tachometer Generators are also excellent rate generators for velocity damping in position servos. The nearly pure dc output-with no phase shift-allows Servo-Tek Tach Generators to be used as feedback transducers for numerous types of equipment, including fast-response servos and other devices. 

Servo-Tek Tach Generators are housed in aluminum casings protected in accordance with Mil-C-5541 or Mil-A-8625. Alnico permanent magnets are used.  Armature shafts are stainless steel, and rotate on fully-shielded stainless steel ball bearings.  Commutators are made from an alloy containing 95% silver. Armature laminations are wound with Isomid insulated wire, over Teflon slot insulation.  The entire armature is impregnated and baked, resulting in a NEMA Class H insulation system.


Servo-Tek Tachometer Features

  • Brush Life: Tachometer Generator brushes and commutators are matched for long life and stability.  Operation at 1 mA output will deliver maximum brush life.
  • Linearity: Linearity, of Servo-Tek DC Tach Generators, at any speed is better than 0.1% of the output at that rpm.
  • Ripple: The DC Tachometer Generator ripple rms value will not exceed 3% of the dc value at any speed in excess of 40 rpm on standard units; 1.5% on low-ripple models.
  • Bidirectional Operation: All Servo-Tek DC Tach Generators operate in either rotational direction.  That direction can be determined by output voltage polarity. Output (in either direction) is held to a tolerance of 0.25% of the average output.
  • Stability: Optimum brush and commutator combination gives 0.1% stability.  Highly stable output gives no evidence of long-term drift.
  • Breakdown Voltage: Servo-Tek DC Tach Generators are factory tested with an ac potential of 1,250 volts rms applied for one second between (either) terminal and the shaft.
  • Temperature Range: Tachometer Generators are designed for continuous operation in ambient temperatures ranging from -55°C to +100°C(-67°F to +212°F).  Voltage output at 25°C will not deviate by more than 0.01% per degree of change within the range of -20°C to +75°C.  All Tachs are temperature compensated, except for Series D and E.

Servo-Tek Series Datasheets

  •  A Series - DC Tachometers with output signal between 1 and 10 volts/1000 rpm.
  • B Series - DC Tachometers with output signal between 11 and 24 volts/1000 rpm.
  • D Series - DC Tachometers with output signal between 25 and 50 volts/1000 rpm.
  • E Series - DC Tachometers with output signal between 0.7 and 3 volts/1000 rpm.
  • F Series – Low ripple DC tachometers with output signal between 1 and 8 volts/1000 rpm.
  • H Series - Low ripple DC tachometers with output signal between 5 and 16 volts/1000 rpm.
  • J Series - Low ripple DC tachometers with output signal between 16 and 30 volts/1000 rpm.
  • Sealed Tachometers available with a variety of outputs.

View Specification Tables for More Information

A&B Series Tachs

D&E Series Tachs

F H & J Series Tachs

Sealed Tachs

Items 1-30 of 122

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  1. BA-7107B DC Tachometers Servo-Tek Products
    BA-7107B

    B-Series, Large Flange, 20.8 V/ 1000 RPM, 8000 RPM Max Speed

  2. BA-7107B-1 DC Tachometer from Servo-Tek Products
    BA-7107B-1

    Tapped Holes / Face

  3. BA-7107D-1 DC Tachometers Servo-Tek Products
    BA-7107D-1

    D-Series, Large Flange, 45 V/1000 RPM, 5000 RPM Max Speed

  4. BA-7346D-1 DC Tachometer from Servo-Tek Products
    BA-7346D-1

    Tapped Holes / Face

  5. CC-7431F-51 DC Tachometer from Servo-Tek Products
    CC-7431F-51

    Custom Mount

  6. CN-7480A-2AC DC Tachometer from Servo-Tek Products
    CN-7480A-2AC

    Custom Mount

  7. CN-7480B-6A DC Tachometer from Servo-Tek Products
    CN-7480B-6A

    Custom Mount

  8. CN-7480D-1 DC Tachometer from Servo-Tek Products
    CN-7480D-1

    Custom Mount

  9. CN-7480D-1J DC Tachometer from Servo-Tek Products
    CN-7480D-1J

    Custom Mount

  10. CN-7546D-1 DC Tachometer from Servo-Tek Products
    CN-7546D-1

    Custom Mount

  11. CN-7573B-6A DC Tachometer from Servo-Tek Products
    CN-7573B-6A

    Custom Mount

  12. CS-7514F-51C DC Tachometers Servo-Tek Products
    CS-7514F-51C

    F-Series, Face Mount, 3 V/1000 RPM, 12000 RPM Max Speed

  13. CS-7561F-51C DC Tachometers Servo-Tek Products
    CS-7561F-51C

    F-Series, Face Mount, 3 V/1000 RPM, 12000 RPM Max Speed

  14. CU-7524B-1 DC Tachometer from Servo-Tek Products
    CU-7524B-1

    Custom Mount

  15. DA-7533A-2 DC Tachometer from Servo-Tek Products
    DA-7533A-2

    Tapped Holes / Face

  16. DA-7533B-1 DC Tachometer from Servo-Tek Products
    DA-7533B-1

    Tapped Holes / Face

  17. DA-7533D-1 DC Tachometer from Servo-Tek Products
    DA-7533D-1

    Tapped Holes / Face

  18. SA-7103A-1 DC Tachometer from Servo-Tek Products
    SA-7103A-1

    Tapped Holes / Face

  19. SA-7103A-2 DC Tachometers Servo-Tek Products
    SA-7103A-2

    A-Series, Tapped Holes / Face, 7 V/ 1000 RPM, 12000 RPM Max Speed

  20. SA-7103A-2C DC Tachometer from Servo-Tek Products
    SA-7103A-2C

    Tapped Holes / Face

  21. SA-7103A-3 DC Tachometer from Servo-Tek Products
    SA-7103A-3

    Tapped Holes / Face

  22. SA-7103A-5E DC Tachometer from Servo-Tek Products
    SA-7103A-5E

    Tapped Holes / Face

  23. SA-7103B-1 DC Tachometers Servo-Tek Products
    SA-7103B-1

    B-Series, Tapped Holes, 20.8 V 1000 RPM, 8000 RPM Max Speed

  24. SA-7103H-1D DC Tachometer from Servo-Tek Products
    SA-7103H-1D

    Tapped Holes / Face

  25. SA-7114A-5E DC Tachometer from Servo-Tek Products
    SA-7114A-5E

    Tapped Holes / Face

  26. SA-7125A-2 DC Tachometers Servo-Tek Products
    SA-7125A-2

    A-Series, Tapped Holes / Face, 7 V/ 1000 RPM, 12000 RPM Max Speed

  27. SA-7249A-2 DC Tachometer from Servo-Tek Products
    SA-7249A-2

    Tapped Holes / Face

  28. SA-7356F-1 DC Tachometers Servo-Tek Products
    SA-7356F-1

    F-Series, Face Mount, 7 V/1000 RPM, 12000 RPM Max Speed

  29. SA-7384F-10 DC Tachometer from Servo-Tek Products
    SA-7384F-10

    Tapped Holes / Face

  30. SA-7388F-1 DC Tachometers Servo-Tek Products
    SA-7388F-1

    F-Series, Face Mount, 7 V/1000 RPM, 12000 RPM Max Speed

Items 1-30 of 122

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