DC Tachometer Generator
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A Servo-Tek DC tachometer generator provides a convenient and economical means of converting rotational speed into an isolated analog voltage signal suitable for remote indication and control. While this contains information on our most popular models, we also manufacture countless special tach generators.
Construction
Most of our DC tach generators are housed in aluminum casings protected in accordance with Mil-C-5541 or Mil-A-8625 or high performance plastics. Alnico permanent magnets are used. Armature shafts are stainless-steel, and rotate on fully shielded stainless-steel ball bearings. Commutators are manufactured from an alloy containing at least 90% silver. Armature laminations are wound with Isomid insulated wire, over Teflon slot insulation. The entire armature is then baked, resulting in a NEMA Class H insulation system.
Ripple
The ripple RMS value will not exceed 3% of the DC value at any speed in excess of 40 RPM on standard units. On the low ripple units, the ripple RMS value will not exceed 1.5% of the DC value. A peak to peak ripple of 1.5% is available on some models.
Linearity
Linearity at any speed is better than 0.1% of the output at that RPM.
Bidirectional Operation
All Servo-Tek tachometer 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 tachometer generators are factory tested with an AC potential of 1250 volts RMS applied for one second between (either) terminal and shaft. E-Series units are tested with 500 volts.
Temperature Range
Most of our DC tachometer generators are designed for continuous operation in ambient temperatures ranging from -55ºC to +100ºC. Voltage output at 25ºC will not deviate by more than 0.01% per degree of change within the range of -20ºC to +75ºC. All units are temperature compensated, with the exception of D-Series and E-Series tach generators.
