Available to Linear Open, Linear Close, Patch, Section, and Rotary scans.
The NULLFILTER technique in the scan dialog box (Insert | Scan) does not filter data at all. Whatever data PC-DMIS receives from the machine controller is the data given you. Although Probe Compensation and FindNoms are still applied there is no data reduction. This technique lets you control the increment of the hits by using the OPTIONPROBE command which sets the point increment during a scan. See the "Parameter Settings: Optional Probe tab" topic of the "Setting Your Preferences" chapter for more information.
PC-DMIS will start at the first boundary point and continue taking hits at the set increment, stopping when it reaches the end boundary point.
The NULLFILTER technique only appears in the Direction 1 Tech. list if you're using an analog probe head, such as the SP600.
For Rotary scans, the probe always maintains the defined radial distance from the center point, perpendicular to the center point vector.