ML2439A USB Power Meter User Guide : Automatic Measurements : Statistical Mode Automatic Measurements
 
Statistical Mode Automatic Measurements
When operating in Statistical mode, the ML2439A has a unique text format display that is available when the TEXT/GRAPH system key is pressed. A sample of the text display is shown in Figure: Text Display Sample.
Text Display Sample
In the Statistical mode the following five automatic measurements are displayed in the ML2439A Text display for both input channels and both trigger channels. The Text column lists the abbreviated forms that appear on the display screen.
 
 
Text
TERM
DEFINITION
Avg
Average Power
The unweighted average of all linear power samples occurring since acquisition started.
Peak
Peak Power
The highest power sample occurring since acquisition was started.
Min
Minimum Power
The lowest power sample occurring since acquisition was started. In logarithmic units a reading below the clip level will display as down arrows.
Pk2Avg
Ratio
The ratio (in dB) of the Peak Power to the Average Power.
The following six cursor measurements display the set position (independent variable) and measured value (dependent variables) where the movable cursor intersects the measurement trace. The position or value measurement text for each dependent variable is displayed in the color of its channel. The independent variable is white. Note that the intersection of the movable cursors and the CCDF traces can be moved outside the visible display area. This does not affect the measurements in any way
 
 
 
Text
TERM
DEFINITION
Cursor Pwr
Cursor Power
Cursor Mode - Power Ref
 
Reference
The reference power level in dBr set by the user to define the measurement point on the normalized CCDF for probability in percent.
 
 
Cursor Mode - Percent
The measured power level in dBr of the normalized CCDF at the Probability in percent specified by the user.
Cursor Pct
Cursor Percentage
Cursor Mode - Power Ref
The measured probability in percent of the normalized CCDF at the reference power level specified by the user.
The following two global status values are displayed:
 
Text
TERM
DEFINITION
Total
Time
The total time in Hours:Minutes:Seconds that the data acquisition has been running.
Points
The total number of data samples in MSa that has been acquired for each channel in the current run.
 
Note 
The total number of data samples is affected by the terminal settings. If Terminal Action is set to decimate, then the sample count will be halved each time the Terminal Count or Time is reached. This should have very little visible effect on the CCDF values, since the entire population is decimated uniformly. If Terminal Action is set to restart, then the sample count will be cleared to zero each time the Terminal Count or Time is reached.