**Logarithm**I/O calculates the logarithm of the input data. The base number and a gain can be set.

A typical application of the Logarithm I/O is to create a vertical axis in dB in the oscilloscope or spectrum analyzer.

## Properties

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

### Gain

The **Gain** property sets the gain of the Logarithm I/O.
Commonly used gain factors of 1, 10 and 20 are available, as well as a user defined setting.
The default value for the gain is 20.

### Base

The **Base** property sets the base number of the logarithm calculation.
Commonly used base numbers of 2, e and 10 are available, as well as a user defined setting.
The default value for the base number is 10.