FAQ: MicroVib II - Analyzer Settings

 

 

Use the tips below to troubleshoot MicroVib II Settings.

To troubleshoot sensors, cables, and mux channels, click here.


  1. How Do I Verify My MicroVib II Input Settings Are Correct?

To check MicroVib II input settings, use the checklist below:

  1. Power Up the MicroVib II.
  2. Press MODE, CONTROL PANEL, SET INPUT PARAMS.
  3. Observe the settings for the currently selected channel.
  4. Compare the input settings with the values below.

The default settings below are correct when using any standard DSS Accelerometer for input.

  • Sensor Type = ACCEL,
  • Volts/EU = 0.020,
  • ICP = ON
  • POL = NORM.

If you are using a High Temp Accelerometer and you have calculated and entered a specific sensitivity value, then the Volts/EU value will be different. For example, if the High Temp Accelerometer & Charge Amplifier sensitivity was calculated to be 19.4 mv/g, then the Volts/EU value would be 0.0194 for the High Temp Accelerometer channel.

Beware of entering the wrong value for Volts/EU. If the nominal value is 0.020 (20mv/g) and the user accidentally entered an incorrect value such as 0.20 (200mv/g), the vibration reading will be displayed 10 times LOWER than expected, very likely permitting an unsafe aircraft condition.

To quickly restore the Input Settings to Factory Defaults, use the check list in the next section.


H 2. How Do I Restore Factory Defaults In The MicroVib II?

Use the checklist below to Restore Factory Defaults in your MicroVib II:

  1. Power Up the MicroVib II
  2. Select Mode then Control Panel.
  3. Press Restore Factory Defaults / Restore Input Defaults.
  4. Press Done, Done, Start Analysis.
     

  3. How Do I Functionally Check My MicroVib II?

The procedure below will require the use of the DSS Signal Simulator P/N 1117-2:

  1. Restore Factory Defaults as described above.
  2. Attach DSS Signal Simulator
  3. Check readings against limits below.
The following limits apply when using the DSS Signal Simulator P/N 1117-2:
 
Tach Speed Limits:  1919.5 - 1920.5 RPM
Vibration Limits: .765-.840 in/s
Phase Angle Limits: 271.9 - 273.5 degrees

Note: The procedure above is a functional test only. It does not fulfill the requirement for equipment calibration. 
 


  4. What If My Balance History File Is Corrupted?
  • A corrupted MicroVib II Balance History file will cause erratic behavior in many different ways. One clue is to observe the two Task indication lines at the top left portion of the screen. If the Task Name and/or Channel Designation are composed of nonsense characters (some people say they look like Egyptian Hieroglyphics), then the history file is probably corrupted and cannot be used.
  • A corrupted Balance History file cannot be repaired and must be replaced with a new one. To create a new Balance history file, press MODE, CONTROL PANEL, NEW HISTORY FILE and follow the instructions in your DSS Application Note.

 

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