Time Metrics (Pulse)

Menu Path: Trace > Data > Result Tables

Menu Path: Trace > Data > Trend Lines

Menu Path: Trace > Data > Histograms

This topic describes the Time metrics displayed in the Result Tables, Histograms, and Trend Lines.

• Rise Time (sec)

  • The transition duration of a positive-going transition.

  • The transition duration is the difference between the two reference level instants of the same transition.

  • Unless otherwise specified, the two reference levels are the 10% and 90% reference levels.

  • Note the reported Rise Time (sec) result metric is directly affected by the user specified threshold property values Rise Time Lower (%) and Rise Time Upper (%) which default to 10% and 90% respectively.

• Fall Time (sec)

  • Fall Time in seconds, reports the time interval for each individual detected pulse's falling edge amplitude level to transition from user specified threshold Fall Time Upper (%) level to Fall Time Lower (%) level.

  • The transition duration is the difference between the two reference level instants of the same transition.

  • Unless otherwise specified, the two reference levels are the 90% and 10% reference levels.

  • Note the reported Fall Time (sec) result metric is directly affected by the user specified threshold property values Fall Time Lower (%) and Fall Time Upper (%) which default to 10% and 90% respectively.

• Rising Edge (sec)

  • The instant in absolute time that the pulse exceeds the Rise Time Lower threshold.

  • Rise Edge (s) result metric relative definition can be controlled by Time Values Are Relative To property selection located under Time tab. User selection choices are relative to either:

    • First Pulse

      • Report per pulse time values relative to first detected pulse start time (i.e. relative to reported Pulse 1 Rise Edge(s) within Region Table results).

    • Trigger

      • Report per region time values relative to acquisition trigger event time, as determined by user configured Input Trigger properties.

• Falling Edge (sec)

  • Fall Edge in seconds, reports the relative timing each individual detected pulse's falling edge OFF amplitude sample threshold transition. (i.e. pulse OFF level transition point)

  • Note the pulse OFF amplitude threshold transition is determined from user specified Threshold Pulse Width (%) property value (default = 50%).

  • Fall Edge (s) result metric relative definition can be controlled by Time Values Are Relative To property selection located under Time tab. User selection choices are relative to either:

  • • First Pulse

      • Report per pulse time values relative to first detected pulse start time (i.e. relative to reported Pulse 1 Rise Edge(s) within Region Table results).

    • Trigger

      • Report per region time values relative to acquisition trigger event time, as determined by user configured Input Trigger properties.

• Width (sec) (On Time)

  • Width in seconds, reports the time interval difference between the detected pulse's rising edge Pulse Width (%) threshold level transition to the detected pulse's falling edge Pulse Width (%) threshold level transition.

  • Note the reported Width (sec) result metric is directly affected by the user specified Threshold Pulse Width (%) property value (default = 50%).

• Duty Cycle (%)

  • Duty Cycle in %, reports the percentage ratio of measured pulse ON time to pulse OFF time . (i.e. Duty Cycle = [Width (sec) / PRI (sec)] * 100.0 %)

  • Note the reported Duty Cycle (%) result metric is directly affected by the user specified Threshold Pulse Width (%) property value (default = 50%).

• PRF pseudo-random function (Hz) (Pulse Repetition Frequency)

  • PRF in Hz, reports the pulse repetition frequency. (i.e. PRF (Hz) = 1.0 / PRI (sec)).

  • Note the reported PRF (Hz) result metric is directly affected by the user specified Threshold Pulse Width (%) property value (default = 50%).

• PRI (sec) (Pulse Repetition Interval)

  • PRI in seconds, reports the pulse repetition interval difference between the detected pulse's rising edge Pulse Width (%) threshold level transition to the subsequent detected pulse rising edge Pulse Width (%) threshold level transition.

  • Note the reported PRI (sec) result metric is directly affected by the user specified Threshold Pulse Width (%) property value (default = 50%).

  • The average PRI can be calculated in cases where the signal has a non-uniform or staggered PRI.

• Off Time (sec) (Pulse Separation)

  • Off Time in seconds, reports the time interval difference between the detected pulse's falling edge Pulse Width (%) threshold level transition to the subsequent detected pulse rising edge Pulse Width (%) threshold level transition.

  • Note the reported Off Time (sec) result metric is directly affected by the user specified Threshold Pulse Width (%) property value (default = 50%).