Unit Definitions

Changing the default unit settings for the UDF measurements is done in the individual measurement unit windows which were established when the PIDF associated with the defined UDF source was READ. Clicking on any of the window access buttons located in the main section of the GUI menu brings that window into the foreground. A typical measurement window might appear as:

Measurement names run down the left-hand column. The two rightmost columns give a pair of units for each measurement. If the units have not been modified then both units associated with any measurement will be identical and will be those set in accordance with the UNITS setting when the window was created. If the menu page was generated from a previously defined Menu File then units will be set according to what was found in that file.

Clicking on either of the unit definitions of a given measurement will bring up a list of alternate units as found under its PIDF definition. It is possible that a measurement will have only a single unit associated with in which case this is a mute exercise. The above example window with dual units defined for several of the measurements is shown below.

Measurements which have only a single unit definition associated with them (both unit definitions are identical) are only output once in the IDL UDF data structure. Measurements with dual unit definitions are output twice in the IDL UDF data structure, once with each of the defined units. Doubly output measurements have the strings _V1 and _V2 appended to their field names in the IDL data structure when output in the STANDARD STORAGE FORMAT.