• Display Live or Measured data on the Single Channel RTA or Multi-Channel Display

• Apply A, B or C weighting to the current or measured data

•  Display in 1/3 or 1/1 octave mode (all data exported in 1/3 octave bands)

•  Display a Reference Spectrum along with the current or measured data (see Reference Spectrum menu)

Averaging Menu

• Select Leq, Exponential, Max Hold or Equal Confidence for Averaging Type

• Select Measurement Duration

• Exponential Averaging Controls (active when Average Type = Exponential) - Select Slow, Fast or Custom exponential time constants.  User definable Custom Time Constant.

• Confidence Level Control (active when Average Type = Equal Confidence) – Select Confidence Level in decibels for equal confidence averaging.

System Calibration  

System calibration can be established for each measurement channel. Users use the Adjust Sensitivity Controls to adjust the sound pressure level at the calibration frequency to equal the calibrator level.  Calibration data is saved along with system configuration data and will be recalled each time the analyzer is started.  A calibration status indicator provides information on the date and time the current calibration data was obtained.

Range Control 

The NAE MCRTA provides both manual and automatic ranging control.  Each measurement channel can be individually ranged in either ranging mode.

• Manual Ranging allows the user to select the proper input range for each channel prior to the start of the measurement.

• Automatic Ranging continuously ranges each channel of the measurement system with a user selectable Headroom allowance

• Restart Autoranging resets the input range for each channel to the lowest input range and restarts the automatic ranging algorithm.

Displaying a Reference Spectrum

The Reference Spectrum features allow users to display an additional 1/3 OB, Lin, Awtd and/or Awtd Impulsive level along with the current or measured data.  This is useful when data needs to be compared to a reference or criteria level.

• Reference spectra may be obtained from Excel spreadsheets or can be obtained from measurements made during the current session and saved to Memory.
   

•  The NAE MCRTA is supplied with an Excel spreadsheet containing several common reference spectrum levels, such as Noise Criteria curve levels.  Users may add and edit the Reference Spectrum spreadsheet to include custom reference levels.

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