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Data Logging

Data logging allows you to produce output text files containing selected spectral parameters along with a timestamp showing when the event occurred.  A separate file is written for each enabled channel.

File Options

Enable Logging: controls the overall logging status.

Filename Format: selects the filename format to use for each channel.

Overwrite Existing file: if a file with the same name already exists it will be overwritten/

Append to Existing file: if a file with the same name already exists, new data will be apended.

Include Time Stamp in first column: if selected, a time stamp will be written for each line in the log file

Include Header on first row: if selected, a descriptive header row will be written on the first line of the file.

Viewer Program: Select the name of the text editor you wish to use for viewing the data logging output files.  The output data is always written in ASCII text.  Notepad is the default.

Logging options for each channel

Output Data Type: Check one or more of the the data items you want to write to the log file.

Logging Interval:  Determines how often the spectral data is logged to the output file.

As Often As Possible - write the parameters to the data logging file every FFT update.  The update interval depends on the FFT size and other processing settings.

Specific Intervals - write the parameters to the data logging file at the selected interval.

Reset Spectral Average each interval - resets the spectal averaging after writing the parameters to the logging file.  This is useful for logging the average spectral data for just the specified interval.  For example: set the spectral average size to Infinite and the interval to 1 second - it will log the one second average and then reset the average for the next interval.

Reset Peak Hold each interval - resets the peak hold spectrum after writing the parameters to the logging file. This is useful for logging the Peak Hold spectral data for just the specified interval.  For example: set the Peak Hold value to Forever and the interval to 1 second - the data logging will contain the peak spectral values for the one second interval.  It will then reset the Peak Hold for the next interval.

Threshold Conditions - allow you to only output data if a condition has exceeded a threshold.  For example: log  the vibrational frequency and level if the specified level is exceeded.  Time stamp data will also show the times at which the level was exceeded.

Apply - check this box to enable threshold condition testing

Threshold Level - enter the level at which the parameter must exceed before logging will occur.  Use the units corresponding to the calibration and amplitude scaling for the channel.

Threshold Type - select the specific parameter that will be tested against the threshold level.  Logging will only occur if the value exceeds the specificed threshold level.

Set Markers - allows you to quickly set the marker frequencies used for some of the data logging parameters

Copy these settings to all channels - quickly apply the current selections to other channels

View Output File:  Opens the current data log file using the specified viewer program.

View Data Logging Folder:  Opens the data log folder using Explorer so you can manage your data log files.  The default folder is set in the <File><Set Paths> menu.

Notes: Use caution when logging the entire spectrum values for large frequency ranges.  The resulting data file will be very large.  Use the Marked Spectrum option to limit the frequency range.

Data Logging On: Fri Sep 30 10:43:41 2009
Time     Freq(Hz)        Amplitude(dB)
10:43:41      527.56   -45.60
10:43:42      495.26   -54.03
10:43:43      495.26   -49.83
10:43:44      1399.66 -59.01
10:43:48      1399.66 -59.14
10:43:49      516.80   -56.38
10:43:50      549.10   -53.37
10:43:51      624.46   -43.66
10:43:52      559.86   -37.96