EcImpdDisplay
control added to an EcInspecton control The EcImpdDisplay control is really misnamed. Normally the signal from the EcInspection control's probe is an impedance signal, it can sometimes be a voltage (for differential probes for example - even this signal appears in the complex plane as the voltage signal has a phase component too). A typical view of the EcImpdDisplay control is shown in the Figure below.
EcImpdDisplay
control added to an EcInspecton control
What the EcImpdDisplay control does is allows you to look at the signal in the X-Y (complex) plane mode or in time sweep mode. Time Sweep mode applies one of various filters and displays the filter output against change in probe position. The Figure below shows an EcInspection control with 2 added ImpdDisplay controls: the top one in X-Y beam mode and the lower one in Time Sweep beam mode.
X-Y Beam mode (upper) and Time Sweep Beam mode (lower)
The EcImpdDisplay control itself is made up several controls that help the user to manage the display and understand the probe signals:
Use the menu bar to gain access to menu commands and submenus. The use of the menu bar is described in the next section.
The Display screen is where the signals from the EcInspection control are drawn. The screen is sub-divided into a grid and the signal is drawn, after the desired filter is applied, either in an X-Y plane or in Time Sweep mode. The last filtered data point added to the display is also written to the pull-down channel list.
If you move the mouse pointer over the Display screen, the screen coordinate
value is temporarily drawn in the pull-down channel list for the channel that
is selected. This allows you to investigate individual data traces on the screen.
Scroll bars
The Scroll bars: vertical and horizontal, might work in a way you might not expect at first. Using the scroll bars moves the axes in the Display screen. Because the EcImpdDisplay control does not store the traces displayed, it cannot re-draw the screen when the axes are moved, so the screen is erased after axes moves. If you are interested in storing the traces just add an EcDataLogger control, which is what it is designed for.
In Time Sweep mode, there is only one axis in the display, so the vertical
Scroll bar disappears.
The pull-down channel list has two main uses. The last data point displayed on the Screen is also displayed in the channel list. While only the selected channel appears, by 'pulling down' the list, you can see all the active channels being displayed by the EcImpdDisplay control and all their values. The pull-down channel list's text consists of the channel name and the data point (after the desired filter has been applied).
The second use of the channel list is to associate the colors used in the Display screen with individual channels. The text in the channel list is drawn with the same color of the channel in focus.
The channel colors are defined as follows:
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