Channels Spreadsheet

The Channels spreadsheet list the properties associated with the Front End acquisition channels

Acquisition Window Showing the Channels Spreadsheet.

Setup, Units, and DOFs Tabs

Three tabs (Setup, Units, and DOFs) are displayed below the Channels spreadsheet which define the properties of each front end channel.

The Select Channel, Active & DOF columns are common to all Channel spreadsheet tabs.

Active Channel Column

Used to make channels active or inactive.  If a channel is active, data will acquired for that channel when data is acquired from the front end.

When data is acquired from the front end, a time domain waveform is displayed in the upper graphics area for each active Channel.

DOF Column

Used to define the channel DOF.  A DOF is typically the Point number & direction of the sensor location on the test article.

Using channel DOFs is optional, but it is strongly recommended as a convenient way of identifying where measurements were made on a test article.

Editing Channel Properties

Setup Tab

Several columns of data on this tab must be set up properly in order to acquire data from the connected front end.

If any property in this spreadsheet is not supported by the connected front end, the background color of its cell will change to purple.

Channels Spreadsheet Setup Tab.

Signal Level Column

Indicates the signal level for each channel during acquisition.

Label Column

Used to enter a text description of each channel.

Input Output Column

Defines the signal on a channel as either an Input, Output, or Both.

ADC Coupling Column

Applies either AC or DC coupling to each acquisition channel.

Transducer Power Column

Turns the power ON/OFF to the sensor connected to each channel.

ADC Range Column

Defines the input voltage range analog to digital converter (ADC) for each channel.

Data Type Column

Defines the data type for each acquisition channel.  Data type can be Translational (vibration), Scalar (temperature, pressure), or Machine Rotation (torsional vibration).

Window Type Column

Defines the type of time domain window to be applied to a channel signal before any frequency domain signal processing is applied to it. Refer to the Signal Processing Commands chapter for more details on the use of these windows.

Window Value Column

Used to specify a numerical value ONLY FOR the end of the Exponential window

The Exponential window uses the value in this column for the end of the window. The Exponential window starts at "1" at the beginning of the window

Units Tab

This tab is used to define the engineering units for each acquisition channel.  M#s of acquired data can be displayed in the graphics area either in engineering units or in volts.

Channels Spreadsheet Units Tab.

Units Column

Defines the acquired data for each channel in engineering units.

Display Column

Displays the upper graphics area (time domain) waveforms in either engineering units or volts.

Transducer Sensitivity, Sensitivity Units  & Transducer Units Columns

These three columns are used together to scale the data on each channel into the engineering units of the Transducer (sensor) using its Sensitivity Units. Sensitivity units can be one of the following,

If the channel Units (entered into the Units column) are different from the Transducer Units, the channel data will be integrated or differentiated from the Transducer Units to the channel Units, if possible.

DOFs Tab

The properties on this tab are used to define & increment the DOF of each acquisition channel as each Measurement Set of data is acquired.

Using channel DOFs is optional, but it is strongly recommended as a convenient way of identifying where measurements were made on a test article.

Channels Spreadsheet DOFs Tab.

Point Number & Direction Columns

These two columns are used to select the Point number & direction of measurement for each acquisition channel.

Manual Increment Column

Increments the Point number & direction (in their respective columns), according to the Increment Point By and Increment Direction By columns.

Increment Point By & Increment Direction By Columns

These two columns are used to specify how the Point number & direction are to be incremented when the Manual Increment button is pressed for each channel.