Haltech IQ3 Data Logger Dash - Manual (Page 57)

IQ3 Data Logger Dash Installation Manual
57
Pulling Data - Setting the Zero Start Point - Very Important
In order for puller competitors to accurately review data, it is necessary to reset the start of
graphed data (Zero Point) for each run. When data is initially downloaded and graphed, the
starting point of the graphed data is when the data logger started saving data to the compact
flash card. For example, if the data logger is set to start logging when engine rpm exceeds 3000,
that point could occur while driving up to the sled, on the first pull. Suppose on the second pull,
the motor does not exceed 3000 rpm until the vehicle is starting the actual pull. When data is
downloaded and graphed, the zero time (or starting point) of the data will be at two totally
different locations. This makes it impossible to accurately overlay and graph data.
The solution to this situation is to manually move the zero time point to the same location,
within each run. This is accomplished by using the Set Start Time icon, located in the DataLink
software. To perform this procedure:
1. Open a Runfile
At this time, it will be necessary to determine what data channel will always be used to
determine the first movement of the vehicle. For pullers, the Accel G channel works well.
2. Graph the Accel G channel.
3. Select the Autoscale icon. This will display all data from beginning to end.
4. Place the cursor in the Main Graph area (the area with the colored graph line)
5. Press and hold down the left mouse button (starting at the very beginning of the run).
6. Drag the mouse to the right until the very first movement of the vehicle is noted.
7. The first movement of the vehicle will be obvious, with an upward spike in Accel G data.
Determine the first movement of the vehicle by continuing to hold the left mouse button down
and watching the real time Accel G Channel Button data (at the top of the page). The Zero start
time will be when the Accel G Channel Button data begins to increase. When the start of the
run is located:
8. Select the Set Start Time icon
9. The Confirm Data Start Time Change
window will open. Select OK
At this time, the graphed data will now start at the new zero time as set by this action.
NOTE: It is vitally important to perform this procedure on every run, or accurate data overlay will not be possible.
Create Trackmap - Required for Closed Course / Oval & Road Race
Upward Spike