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TM 9-2320-364-20-1
2-11. TROUBLESHOOTING INSTRUCTIONS (CONT).
NOTE
If you change your mind while creating a custom list, you can use the LEFT arrow key
to back up through the list. When the item you wish to change appears, simply scroll
the parameter list to locate the new item and ENTER it. Also note that backing up
through the list erases each item you pass through. You will have to recreate the list
from the point of the change item.
(10) Snapshot. The Snapshot function permits the DDR to record data while the truck is being driven. Then
the data can be played back when you return to the shop. You can use this feature to locate operating
problems that would be difficult to locate by any other method. Depending on truck type and the data
rate, the DDR will record over 50 minutes of data.
NOTE
The amount of information that can be recorded is determined by the data update rate
selected. Refer to Step (11)(f) (Data update rate).
(a)
When you are using Snapshot, the DDR is continuously recording data. When the memory is filled,
the oldest data is dropped and the new data is continuously added. When an operating condition
occurs, the DDR puts a marker in the data recording so you can find the exact spot later during play
back. We call this ability to mark data for play back a "trigger". Because driveability problems are
often related to diagnostic codes, one of your choices is to use a diagnostic code as the trigger. You
can choose any code, or a specific code to be the trigger. Or you can trigger the recorder yourself
manually if a suspicious driveability condition occurs.
(b)
It is sometimes helpful to look at data that occurred before the operating condition happened, for
instance, looking for an unnatural trend. It is also sometimes helpful to look at data that occurred
after the operating condition happened. DDR allows you to decide ahead of time how much data
will be retained before, as well as after, the trigger point.
(c)
When you select the Snapshot function, you will see the Snapshot menu selection readout. Choices
include Quick Trigger, Trigger Set-Up, Data Update Rate and Review Snapshot.
SNAPSHOT MODE
XXX FRAMES FREE
SELECTIONS
QUICK TRIGGER
Data Readout Window
NOTE
The second line indicates the amount of frames of memory available to record data.
Although there is no simple way to relate frames to the amount of driving time that will
be recorded, generally a larger number translates into more minutes of recording time
than a smaller number.
(d)
Quick trigger. You will use Quick Trigger to start the snapshot process. If you are using Snapshot
for the first time, selecting Quick Trigger automatically chooses the default operation. This is the
manual Any Numeric Key trigger.
2-114

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