A typical application of the Add / Subtract I/O is performing a differential measurement using two channels. When the high voltage and the low voltage of the differential signal are measured, the differential signal can be calculated by subtracting the low signal from the high signal.
Properties
To control the behavior of the Add / Subtract I/O, several properties are available.
These can be accessed through a popup menu which is shown when the I/O is right clicked in the Object Tree.
The properties can also be accessed through its settings window which is shown when the I/O is double clicked in the Object Tree.
To open the Object tree, click the 
Show object tree button.
By default, the settings window only shows the most used settings. When Advanced is ticked, the extended window with all settings is shown. See also the program settings.
Mask
The +- mask determines which sources are added and which sources are subtracted. This mask contains a '+' or '-' character for every connected source. By default, the mask consists of '+'-es only and all sources are added. To subtract a source, set its corresponding mask character to '-'.
Some examples of +- masks are shown in the table below:
| Sources | Mask | Result |
|---|---|---|
| 2 | ++ | src1 + src2 |
| 2 | +- | src1 - src2 |
| 2 | -+ | src2 - src1 |
| 2 | -- | -src1 - src2 |
| 3 | +-- | src1 - (src2 + src3) |
| 6 | +-+--+ | (src1 + src3 + src6) - (src2 + src4 + src5) |
Common properties and actions
Related information
Software generator
The Software generator source (SofGen) generates fully configurable standard signals like sine, block and triangle.
Gain / Offset
The Gain / Offset I/O multiplies a signal with a constant gain factor and adds a constant offset.
Multiply / Divide
The Multiply / Divide I/O multiplies or divides data of two ore more sources.
Sqrt
The SQRT I/O calculates the square root of each sample of the source's data.
ABS
The ABS I/O takes the absolute value of each sample of the source's data.
Differentiate
The Differentiate I/O differentiates the source's data.
Integrate
The Integrate I/O integrates its source's data.
