Hawkins Associates Company
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Tachometer Test Sets
by Aircraft Instrument Support Services, Inc.





Tachometer Test Set
Model 971-3

The Model 971-3 (shown on the left) by Aircraft Instrument Support Services, Inc. (AISS) is one of the best tachometer testers on the market. Based in Austin, TX, AISS has more than 20 years in the market and has become a leader in test equipment manufacturing. The newly-introduced Model 971-3 Triple Digital Tachometer Tester combines circuitry equivalent to three Model 971-2 testers (shown below) and provides the same precision. It is housed in a rugged 19" rack-mount enclosure and features forced-air cooling for total reliability. There is absolutly no better tester on the market.



Basic Capabilities and Specifications of the Model 971-3:
  • Use for functional test or calibration in the aircraft or on the lab bench
  • Can be used to test triple tachometers, such as used in helicopters
  • User-selectable RPM auto-sweep mode for diagnostic testing
  • 100 to 9,000 RPM range, in 1 RPM steps
  • Accuracy of ± 0.1 RPM, or ± 1 PPS
  • Dual-mode operation supports both 2-pole and 4-pole tachometers

Safety Features of the Model 971-3:
  • Overload protection on all outputs
  • Over-temperature protection
  • Fused 115 VAC 60 Hz



Tachometer Test Set
Model 971-2

The Model 971-2 (shown on the left) is the same as the model 971-3
but with only one digital 3-phase tachometer output. This advanced instrument uses digital signal processing technology to achieve unrivaled performance and versatility. Its crystal-referenced solid
state design provides drift-free, reliable operation.






Basic Capabilities and Specifications of the Model 971-2:
  • Use for functional test or calibration in the aircraft or on the lab bench
  • Can be used to test twin tachometer and turbine N1 and N2 indicators
  • Internal DC power supplies (5, 12, 24V) for lights and power
  • User-selectable RPM auto-sweep mode for diagnostic testing
  • 100 to 9,000 RPM range, in 1 RPM steps
  • Pulse outputs - 100 to 9,000 RPM, and 100 to 9,000 PPS
  • Accuracy of ± 0.1 RPM, or ± 1 PPS
  • Dual-mode operation supports both 2-pole and 4-pole tachometers

Safety Features of the Model 971-2:
  • Overload protection on all outputs
  • Over-temperature protection
  • Fused 115 VAC 60 Hz


For AISS's Model 393 Pitot-
Static Test Set click here.....


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