Digital Oscilloscope

Typical single-channel Digital Oscilloscope display.

The Digital Oscilloscope is the heart of ODIS. From this window, the user can manipulate the waveform returned from an A/D board and set up Gates to collect features.

Overview

Two-Channel system, with channels named "Front" and "Back". Clicking on a tab will show the Scope for that channel.

The Scope consists of a waveform display region and controls for manipulating the results. There may be one or more display regions, depending on the number of A/D boards in the system. Each board's result is shown in a separate tab.

parameters can be copied from one channel to another. First, right-click on a channel tab and select "Copy Settings" from the resulting menu. Then right-click on the destination channel and select "Past Settings". This will copy the A/D and Gate setups from the source channel to the destination channel.

Note: if the source and destination channels are different types of A/D boards, some settings may not be transferred.

Scales

click in the highlighted region to change the Horizontal scale

Click in the highlighted region to change the Vertical scale.

The vertical scale of the scope measures the intensity of the returning signal. The scale can be set in Volts, %FSH, or dB. To change the scale, click at the top left corner of the Scope window, at the topmost vertical units entry.

The Horizontal scale measures the time at which the signal is located. It can be displayed in either microseconds (us) or mm/inches, depending on your Configuration settings. To change the scale, click on the lower left corner of the scope, where the horizontal units are displayed.

Mouse Controls

There are a number of mouse modes available on the scope. In order to switch between them, the user moves the mouse over the scope window and right-clicks the mouse button to rotate through the controls. The controls available are listed below.

Zoom

The user can zoom in or out on the scope using two methods:

• use the Magnify Tool () To zoom in and out by left-clicking on the scope, holding the left button down, and move the mouse up and down. The point at which the user clicked will remain the "Center" of the zoom as the user moves the mouse.
• use the I-Beam Tool (I) to select a region of the scope on which to zoom. To make the selection, left-click and old the mouse on the scope, drag the mouse over the desired zoom selection, and release the mouse when done.

Pan

The user can pan the scope back and forth to see different positions in time. The pan control is the hand icon (). To pan the scope, left-click on the scope with the hand tool and hold the left mouse button down. Move the mouse left and right to pan the scope.

Gates

A user can click and drag on gate to move or resize them using the mouse. The Gate selection mode is the Arrow icon (). Gates have grab points at the left, right, and middle of the gate. Usually the leftmost point will move the gate, the middle point will change the gate threshold, and the rightmost point will change the gate length. Other points may be available depending on the gate type.

See Also: Gates and Regions

Toolbars

Controls

A number of controls can be made visible by pressing on the Controls button at the top left of the scope form (). These controls are subdivided into tabs based on the type of settings being manipulated.

Gate Settings

The Digital Oscillscope has controls for setting up you Gate Tree. There is a Basic Mode (not to be confused with the ODIS Basic Mode and an Advanced Mode for finer control. In Both cases, gates are added to the Gate Tree (shown on the bottom left of the Gate Settings tab.

Basic Mode

Gate Settings (Basic)

The Basic mode consists of the Gate Tree and a set of buttons. To add a gate, press on the specified button. The gate will become a child of whatever gate is selected in the Gate Tree window.

Front Surface Follower, Rising Edge or Falling Edge

Sub-Surface Follower, Rising Edge or Falling Edge

Data Gate

RTG Gate

B-Scan Gate

Before adding a data gate

After adding a data gate

Advanced Mode

Gate Settings (Advanced)

By clicking on the "Show Advanced" button, the user will see the Advanced gate settings. This allows for more gate options and better control over gate positioning. To add a gate, right-click on the Gate Tree and select "Add Gate". A dialog box will appear letting the user specify the gate type and settings.

The gate will become the child of whichever gate was originally clicked.

Add Gate Menu on the Gate Tree

Dialog when adding a gate. The user can specify the type, name, color and other features.

File:SALIGateDialog.PNG Dialog when adding a SALI Gate.

For more information on the gate types, see Gates and Regions.

Board Settings

Sample Board Settings Tab

The Board Settings tab is used to control A/D board settings. Each channel has independent settings.

Note: exact board settings will vary among board types. Consult your board manual for details.

Digitizer Settings

Sampling Rate

The frequency at which the A/D board will sample the analog waveform data, in Megahertz (MHz). Available frequencies depends on the type of A/D board and OKOS_Controls_Config.xml options.

Trigger Mode

the method used to tell the A/D board to start collecting data.

See Also: Triggering

Input Range

the voltage range of the signal, in Millivolts (mV). The Y-scale of the Scope will use this range.

Threshold

Sets the voltage threshold for BNC and Threshold triggering, in Volts (v).

Status Indicators

Encoder Position

shows the current state of the encoder count on the A/D board.

Temperature

shows the current temperature of the A/D board. Consult your A/D manual for safe operating ranges.

Advanced Settings

Input Offset

A/D Offset

Averaging

Averaging allows the user to combine multiple waveforms in order to smooth out noise issues.
See Also: Waveform Averaging

WFs to Average

The number of waveforms to average together.

Multitrigger

whether or not to use Multitrigger mode when performing averaging.

Holdoff

the amount of delay (in microseconds) between Multitriggers.

Align

whether or not to attempt to align the collected waveforms to the Front Surface Follower crossing before averaging.

FFT Settings

FFT Settings Tab

Filter Settings

Waveform filter settings

TGC Settings

TGC Settings Tab

The TGC Settings tab is where Time/Gain Corrections are made to the ultrasonic waveform. This lets the user compensate for signal loss as the sound travels deeper into the material of the part.

See Also: Time/Gain Correction (TGC)

Diagnostics

If Diagnostics are enabled, a few extra features are present.