Chapter 8. Change Settings

In RASCHlab you can set different options how the data is shown. The options are for all recording channels (Figure 8-1) or for a single channel (Figure 8-2). To open one of the both dialog boxes, you have to click with the right mouse button inside the view window. Then a popup menu appears and the first entry opens the general options dialog box and the second menu entry opens the channel options dialog box (see Figure 6-2).

The general options are:

• 'show statusline': show or hide the status line; the status line is the line at the bottom of the signal view(s), showing informations about the current positions and the current selection

• 'show channel info': show or hide the name and the unit of the channels on the left side of the signal view

• 'show grid': show or hide the grid in the signal view

• 'use fixed channel-height': With this option you can select if for each channel a fixed height (in pixel) should be used. The default behaviour is to give each channel the same space depending on the available space. Therefore the space changes when the size of the window is changed. When this option is enabled, the space for each channel is always the same independent of the current window size.

• 'speed [unit]': Here you can set the "writing speed" used to draw the recorded data. At the moment the unit is fixed to 'mm/second'.

When drawing a recording channel, two modes are available: (1) draw the data centered around a specific niveau and use the given resolution to scale the amplitude or (2) scale the data in that way, that the min-value corresponds to the lower channel border and the max-value corresponds to the upper channel border. When using the second mode you have the option to set only the min-value and let the max-value be "controlled" by the resolution.

The niveau used for mode one is a percentage of the channel height. Typically you use 50%, this means the data is centered around the middle of the channel.

The first mode is used for data which is centered around a specific niveau. This is typical for ECG's. The second mode is used for data which are normally in a specific range. This mode is used for example for continues blood pressure recordings.

In the channel options dialog box you have to select first the channel for which the options should be set. The channel can be selected in the combo-box at the top of the dialog box ('select channel').

The channel options are:

• 'Position' - 'centered': draw the data centered around a specific niveau (see text above)

• 'Position' - 'min/max': scale the values to given min and max values (see text above)

• 'show channel': show or hide a channel

• 'invert channel': if selected, the channel is drawn inverted

• 'Resolution': Here you set the amplitude resolution used for drawing the channel.