Summary Table

Menu Path: Trace > Data > Result Tables

The FMCW Summary Table includes all non-region-specific result metrics, measured over all valid synchronized FM Frequency Modulation region time samples detected within the user-defined Acquisition Length (sec).

Metric Descriptions

Each result metric in the Summary Table is described below:

• FM Regions -- FM Regions reports the number of valid LFM Analysis regions detected within the Acquisition Length (s) time interval, up to the Maximum Region Count value. Valid LFM Analysis regions will depend on the Region Synchronization mode, as follows:
  • Region Sync = Automatic
    • FM Regions metric represents number of LFM Analysis regions detected which meet the user specified Auto-Detect Setup property detection criteria.
  • Region Sync = Sync to Manual Reference or Triggered
    • FM Regions metric represents number of LFM Analysis regions detected which meet the user specified Manual Reference Description property detection criteria. Note that only defined Ref Regions with the associated Analysis checkbox enabled will be included with the FM regions result metric.
• Ref Regions -- Ref Regions reports the number of reference regions (region repetition interval) assumed for separation of statistical data gathering of the currently measured FMCW region-group modulation pattern.

  • The Ref Regions count describes the number of unique LFM regions contained within each repetition instance of the measured signals LFM region-group pattern. This value is used for Ref Region identification within FMCW Region Table results, plus associated per Ref Region statistical metric reporting within Current Record Statistics and Cumulative Statistics

  • This value will depend on Region Synchronization mode as follows:

    • Region Sync = Automatic
      • When Reference Region Count = Automatic, the Ref Regions metric represents the automatically detected Reference Region Count, derived from measured FM Slope (Hz/us) modulation trace results repetition pattern observed over the Acquisition Length time.
      • When Reference Region Count = Manual, the Ref Regions metric will report the user specified Reference Region Count value.
    • Region Sync = Sync to Manual Reference or Triggered
      • The Ref Regions metric will report the user specified number of Ref Region entries within the currently defined Manual Reference Description
• Avg Power -- Avg Power reports the average power in dBm deciBels referenced to a milliWatt: dB relative to 1 milliwatt dissipated in the nominal input impedance of the analyzer measured over the entire Acquisition Length (sec).
• Peak Power -- Peak Power reports the peak power in dBm measured over the entire Acquisition Length (sec).
• Time Offset -- Time Offset reports the time offset in value in seconds, from acquisition trigger event occurrence to the start of first valid detected LFM region within Acquisition Length (sec) (i.e. where first valid detected LFM region is reported as Region 1 within Region Table).
• Timing Error -- Timing Error reports the average amount of reference timing compensation in ppm (parts per million) units, applied during Region Synchronization = Sync to Manual Reference mode, in order to optimize time alignment of user specified Manual Reference Description to the measured signals region-group modulation pattern time repetitions.
  • A reported Timing Error of 0.0 ppm would indicate good time alignment between Manual Reference Description, and measured LFM region-group time repetitions.
  • A reported Timing Error of < 0.0 ppm (or > 0.0 ppm) would indicate measured LFM region-group repetitions are occurring earlier (or later) in time than expected based on Manual Reference Description.

  • Connecting your instrument’s External Frequency Reference to the DUT Device under Test: An acronym used to describe some type of electrical apparatus connected to test instrumentation. The apparatus can range from a single component to a complex subsystem such as a mobile phone, base station or MSC. Reference Frequency would be required in order to eliminate any frequency reference & timing differences.

    The Summary Table - Timing Error metric is only valid when Region Synchronization = Sync to Manual Reference, otherwise Timing Error will be reported as “***”
• Freq Error -- Freq Error reports the average amount of frequency compensation in Hz, applied during synchronization when Reference Data Selection = Manual mode, in order to optimize frequency alignment of user specified Manual Reference Description to the measured signals region-group modulation pattern.
  • A reported Frequency Error of 0.0 Hz would indicate good frequency alignment between Manual Reference Description, and measured LFM region-group modulation pattern. A reported Freq Error of < 0.0 Hz (or > 0.0 Hz) would indicate measured LFM region-group modulation pattern occurs at a lower (or higher) frequency than expected based on Manual Reference Description.

  • Connecting the 89600 VSA front-end acquisition instrument’s External Frequency Reference to the DUT Reference Frequency would be required in order to eliminate any frequency reference & timing differences.

    The Summary Table - Freq Error metric is only valid when Reference Data Selection = Manual, otherwise Freq Error will be reported as “***”
• FM Slope Max Dev Limit -- FM Slope Max Dev Limit reports the currently used Max Region FM Slope Deviation (Hz/us) value for automatic LFM region detection when Region Synchronization = Automatic mode.
  • When Max Region FM Slope Deviation = Automatic mode, the FMCW analysis software will automatically determine an appropriate Max Region FM Slope Deviation (Hz/us) value based on the measured FM Slope (Hz/us) modulation trace results observed over the Acquisition Length time. This automatically determined value is reported as the “FM Slope Max Dev Limit (Hz/us)” metric value within the FMCW Summary results table. The user may further choose to apply a Scale (%) adjustment factor greater (or less) than default 100% value in order to increase (or decrease) the automatically determined “FM Slope Max Dev Limit (Hz/us)” value.
  • When Max Region FM Slope Deviation = Manual mode, the user specified Max Region FM Slope Deviation (Hz/us) value is reported as the FM Slope Max Dev Limit metric.
• FM Decimation Factor -- FM Decimation Factor is the automatically calculated or manually set sample rate decimation that is applied to the FM, FM Slope, Phase and Amplitude output trace results.