Duty cycle

Duty cycle I/O The Duty cycle I/O can be used to determine the duty cycle of a signal. The duty cycle is defined as the ratio between the time that a signal is "active" and the period. It is usually expressed as a percentage.

When the source data contains multiple cycles of a signal, the duty cycle will be determined for each cycle of the input signal. The output of the duty cycle I/O will then contain the progress of the duty cycle in the input data.

A typical application of the Duty cycle I/O is to analyze control signals of actuators that are duty cycle driven.

Properties

To control the behavior of the Duty cycle I/O, several properties are available. These can be accessed through a popup menu which is shown when the I/O is right clicked.

Type

The Type property determines how the duty cycle is determined. Two types can be selected from:

  • Normal
    In most applications, the active state of a signal is "high".
    Duty cycle normal
  • Inverted
    In some applications, for example in automotive applications, it is more common to consider "low" as the active state of a signal.
    Duty cycle inverted

Mid level

The Mid level property sets the level that determines whether a signal is "high" or "low". In the setting Auto level, the mid-level is automatically detected, as halfway between the minimum and the maximum of the input signal. In most applications this will give good results. However, when a signal is noisy or inactive, it can lead to wrong duty cycle detection. To prevent this from happening, it is possible to set the mid-level to a User defined value.

Common properties and actions

Alias

You can change the displayed name of an object by giving it an Alias. This can be handy when you are dealing with a lot of objects and have problems keeping them apart. You can for example give channel one of your instrument the alias "Battery", when it is measuring a battery voltage. To give an object an alias, use the item Alias ... in its menu. To remove an alias and revert to the original name of the object, set the alias to an empty string.

Color

When multiple sources or I/O's are displayed in a graph or a meter, they can be distinguished from each other by their Color. Three different color settings are available for a source or an I/O.

  • Automatic
    A color is selected from a group of colors. There are separate groups for channel colors and source colors. The groups can be configured in the program settings. Each new channel or source uses the next available color in the group. When the last color in the group is used and another channel or source is added, picking will start at the top of the group again.
  • As source
    This setting is only available for I/O's. The I/O will use the same color as its source. When multiple sources are connected to the I/O, the color of the first connected source is used.
  • User defined...
    The color of the source or I/O is user selected, using a color picker dialog. Any color can be used.

Disconnect all sources

To disconnect all sources from an I/O or Sink at once, use the Disconnect all sources action.

Disconnect sink(s)

To disconnect one or more sinks from an I/O or Source, use the Disconnect sink(s) action. This will show a dialog that lists all connected sinks. Individual sinks can then be selected and disconnected from the object.

Disconnect all sinks

To disconnect all sinks from an I/O or source at once, use the Disconnect all sinks action.

Clone

When a new object is to be created, similar to an already existing object, with the same properties, the Clone action can be used. This will create an identical copy of the original object, with the exact same properties. Source(s) and sink(s) of the new object are not yet connected.

Delete

The Delete action deletes a source, I/O or sink. All connections of the object will be disconnected and then the object will be removed from the object tree. The source property of the objects that used this object as source will be cleared. The sink property of the objects that used this object as sink will be cleared. An axis in a graph that was connected to this object will be also deleted.

Export data

The Export data action allows to export the data of an object to a file. This is detailed described on the page about Exporting data.

Load

The Load action allows to load the settings and data for an object from a TPS or TPO file. This is detailed described on the page about Loading into selected objects.

Save as

The Save as action allows to save the settings and data of one or more objects to a TPO file. When multiple objects are selected, the connections between the objects are saved as well. This is detailed described on the page about Saving objects to a TPO file.