FM Decimation Factor
Menu Path:
FM Frequency Modulation Decimation Factor allows you to control how much sample rate decimation is applied to the FM, FM Slope, Phase and Amplitude output trace results.
Use of higher FM Decimation Factor values can be useful to both improve FMCW measurement update rates and reduce host processor RAM memory requirements when measuring either high Bandwidth (high Sample Rate) acquisitions or longer Acquisition Length time.
- Automatic
- By default, the FMCW analysis software automatically determines the FM, FM Slope, Phase and Amplitude output trace result sample decimation factor used to be the maximum allowed value Max FM Decimation Factor based on relationship below:
Max FM Decimation Factor = 1 / (2 x FM Filter BW %)
Example:
When the FM Filter BW property is set to 2% (as shown in example below), the Max FM Decimation Factor = 1 / (2 x 0.02) = 25.
The calculated Max FM Decimation Factor value is displayed in the grayed-out Manual field and also in the FMCW Summary Table.
- By default, the FMCW analysis software automatically determines the FM, FM Slope, Phase and Amplitude output trace result sample decimation factor used to be the maximum allowed value Max FM Decimation Factor based on relationship below:
- Manual
- Alternatively, you can manually specify the FM Decimation Factor to any integer value between 1 and the calculated Max FM Decimation Factor (refer to calculation above).
- Default selection: Auto
- Default value: 6
