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--- ecmlink101dataloggingtips [2009/05/14 10:09]
twdorris
+++ ecmlink101dataloggingtips [2024/03/15 11:16] (current)
@@ Line 29: / Line 29: @@
 ===== Graph preferences =====
-{{  http://www.ecmtuning.com/images/forums/v3screenshots/graphprefs-global.png}}
+{{  https://www.ecmtuning.com/images/forums/v3screenshots/graphprefs-global.png}}
 Right click in a graph and select "Graph preferences".  This dialog configures global preferences related to the operation of the graph display component.
 ==== Local view settings ====
-Here you can change the default graph legend font size, graph back ground color, number of legend columns, etc.  These changes, as the name of the tab implies, effect only the current view (current datalog tab) unless you also check the "save as defaults" button before hitting OK.  If you check that button before hitting OK, then the values you specified in the dialog will be used for future datalog tabs as well as the current.
+Here you can change the default graph legend font size, graph back ground color, number of legend columns, etc.  These changes, as the name of the tab implies, affect only the current view (current datalog tab) unless you also check the "save as defaults" button before hitting OK.  If you check that button before hitting OK, then the values you specified in the dialog will be used for future datalog tabs as well as the current.
 ==== Global settings ====
@@ Line 51: / Line 52: @@
 You can use this to look for high throttle areas, for example.  Hit Ctrl-Q to hide everything, then display only throttle position in the graph.  Scroll to the area where that one item spikes high, select the area, zoom into it and then hit Ctrl-Q again to redisplay everything.
+===== Comparing two datalogs =====
+This is a little hard to explain in written words.  But I'll give it a try.
+It's very common to want to compare two datalogs side by side to see exactly where differences might exist.  Until we add a specific screen for this function (it's planned), you can do much the same thing by simply toggling between two datalog tabs that are positioned and zoomed into the same common areas.
+For example, let's say you have two datalogs each with a 3rd gear pull from 4000 RPM to 8000 RPM.  Position the display cursor on, say, 6000 RPM in each log and hit the space bar to center the graph at that point.
+Now the two graph tabs are centered at the same point.  To make sure they are zoomed identically, select the View->Zoom default item in each tab.  This resets the zoom level to the graph display default width preference (see graph preferences above).
+Now both tabs are centered at the same point and zoomed out to the same level.  They are effectively scaled and positioned identically.  Now all you have to do is quickly switch between the tabs to visually see differences between them "pop out" at you.
+To do that, click on the tab name of one and then click again so that a blue box is around the tab name which indicates that the tab itself has focus and not some component inside the tab.  With that selected, you can use the left/right arrow keys to quickly switch between the two tabs.  You will, of course, what to make sure the tabs are immediately next to each other for the easiest comparison.  You can even close all other tabs and then just use the right arrow key by itself to automatically toggle between them!

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