Guralp Systems CMG-EDU - Manual (Page 18)

CMG-EDU
also hide the panel this way.
Above the stream display is a toolbar, containing icons which act on
all of the streams within the window.
3.6.1 Zooming in and out
To zoom in and out vertically, click the vertical scale icons
at the top left of the window, or use your mouse wheel.
The current zoom factor is shown between the icons, as a ratio of
pixels to counts. Zooming in and out affects every stream in the
window.
To zoom in and out horizontally, click the horizontal scale icons
, or hold down SHIFT whilst turning your mouse wheel.
The current zoom factor is shown between the icons, in pixels per
second. To convert to pixels per sample, divide the zoom factor by the
sample rate for the stream.
If you have a large window which takes some time to scroll, especially
at a high horizontal zoom factor, Scream! may not be able to finish
drawing new data before it needs to scroll again. If this happens,
Scream! will delay scrolling until it can display in real time once
more. To prevent this, decrease the time scale.
If you have paused the window with the icon, you can zoom into
an area of interest by dragging a rectangle across the streams. Scream!
displays the time span in the top right corner of the rectangle, and the
number of counts in the bottom left corner. When you zoom this way,
Scream! will always keep the edges of the window at 1-second
boundaries. You can drag across one stream, or several; the resulting
window will still include all streams.
3.6.2 Making measurements
Click the Time Cursors or Ampl Cursors button to display a pair of
vertical or horizontal cursors. Each cursor has a white square at one
end, which can be dragged across the Waveview window to measure
features. If two cursors coincide, you will only be able to see the
squares.
18 Issue A