Physical quantities

Dewesoft offers editor which allow the user to add or modify physical quantities. The Physical quantities editor can be found in the editor list in the options.

DS_options_editors_physicalQuantities

When we enter the editor, the following window appears:

  • Add physical quantity¬†(if the physical quantity is missing, additional can be added here)
  • Remove physical quantity (this option can remove additionally added physical quantities)
  • Save (saves the changes to PhysicalQuantitiesX.xml)
  • Add units (additional units can be added to any physical quantity)
  • Remove units (additionally added units can be removed)
  • Exit (close the physical quantities editor)

DS_options_editors_physicalQuantitiesDefault

Add custom physical quantity

To add a new physical quantity click on the + button above physical quantities.

There are different fields which need to be filled to add the new quantity:

  • Descriptor and name (write the name of the new physical quantity)

DS_options_editors_physicalQuantities_addNewQuantiti

  • SI units (write the correct exponent next to the SI unit)

The m/s is described with exponent 1 next to the “m” unit and exponent -1 next to the “s” unit.

For our example we have used the electric conductance which has these SI exponents:

SI unit Exponent
m -2
kg 1
s 3
A 2
  • Used for measurement (this option allows you to show the custom unit only in some of the measurement types in the channel setup)

DS_options_editors_physicalQuantities_addNewQuantity_example

Every physical quantity needs also units which are defined on the right side of the editor.

DS_options_editors_physicalQuantities_addNewQuantity_unitExample

With every unit we need to define scale, operator and offset which allows Dewesoft to transfer between the units:

  • Scale (defines the ratio new unit compared to t
  • Operator (defines the offset type: add, ratio, Log. ref.)
  • Offset (defines the offset between default and new unit)

A great example where scale, operator and offset are used, its temperature:

DS_options_editors_physicalQuantities_ScaleOperatorOffset_example

As soon as the new physical quantity is added, we can also see it in the channel setup:

DS_options_editors_physicalQuantities_channelSetupExample