# Channel and signal math

## Math Channels

Swept Sine testing is the primary tool for characterizing the dynamics of a test article. Sine testing delivers sinusoidal excitation to the article under test, controlling the excitation level through a pre-defined frequency range.

#### Math Channels Act as Input Channels

The resulting math channel will show up in your test as if it were a physical input BNC – and will carry through your whole test

#### Extensive Math Operations

Arithmetic, integration/differentiation, resultant vectors, filtering, matrix operations (including kinematic/DOF transformations) are all part of the math functionalities

#### Shaker Control and Limiting

Math channels can be used to sum forces or compute moments – and the resulting math channels can then be used as a real-time control or limit channel in a shaker test

#### Gap Free

Math channels are computed in the time domain and are gap free – making them ideal for calculating displacement or relative displacement between one or two accelerometers

#### Operate between Input, Output, or Math Channels

The operands for a math channel can be any channel – there is no need for them to be on the same card or chassis. Math channels can also stack on top of one another, with the result of one math channel used as an operand for another

#### Time Domain Recording

Gap-free time histories of the math channel can be recorded and saved for re-analysis, display, or export

#### Channels on Any Card/Chassis

There are no restrictions on the card or chassis (for multi-chassis configurations) operand channels must be on for a Math Channel

#### Unrestricted Sample Rates

Sample rates of math channels are inherited from the test setup

#### Apply a Math Operation to Several Channels at Once

Quickly apply the same math operation to several channels – for example, create high pass filtered copies of all input channels

#### Relative Displacement

Easily calculate relative displacement from accelerometers

Access the Data Sheet

“Channel and Signal Math”

## Signal Math

Signal Math allows calculations on individual frames of data, such as a frame of a time history or a PSD. The resulting data is computed live with the test and can be placed in reports or reviewed along with the test data.

#### Several Mathematical Operations

Perform arithmetic, FFT/IFFT operations, averaging, and more on time or frequency domain signals

#### Time or Frequency Domain

Create Signal Math signals based on time or frequency domain data