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  • 122115-01
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  • Small size and weight for portable operation
  • Battery or ac adapter power options
  • Automatic shutoff powers down when the battery is low
  • 2 channels, display an orbit for XY probe configurations

What's in the Box

  • 9V battery
  • Universal AC adapter
  • Power cord
  • User guide
  • Soft carrying case


The Bently Nevada 990/991 test adapter inverts and isolates the PROX OUT signal from the 990 vibration transmitter so that you can connect 990 transmitters to ac-powered diagnostic equipment. The adapter modifies the PROX OUT signal so that it matches our standard Proximitor sensor signals by performing these functions:

  • Shifts the phase of the PROX OUT signal by 180º by changing the voltage from positive to negative
  • Isolates the transmitter from diagnostic equipment so that equipment with different grounds will not affect the transmitter's 4-20 mA loop signal
  • Reduces noise in the surrounding area from affecting the PROX OUT signal