Datalogger Timing - Aston Martin DB7 Workshop Manual

The Aston Martin Lagonda Diagnostic System
Users Guide
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Datalogger Timing
Select the 'clock' icon from the main menu screen.
Confirm the selection using the 'tick' icon.
The Datalogger timing screen should now be displayed.
Datalogger Timing
Signals
Sample Interval
Record time
Pre-trigger
Post-trigger
00:33:20
50% 00:16:40
50% 00:16:40
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Datalogger Timing
The Datalogger timing screen allows customisation of the
sample interval and duration of data capture.
The display w i l l identify the number of parameters
(channels) which have been selected to be recorded by
Datalogger.
Timing changes can only be made while data capture is
inactive. Entering Dataloggertiming while vehicle data is
being captured will display the current settings, but disable
selection.
Signals
The signals are the number of parameters set for sampIing
by Datalogger.
Sample Interval
The sample interval (frequency) defines the time interval
between successive block requests for all recorded
parameters.
The sample interval is selectable to enable fast response to
intermittent faults.
Note: Very short sample intervals may reduce test
duration because ttie PDU memory becomes full of data.
Select the sample interval rectangle.
Acaiculator-style icon should nowbedisplayed.
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Aswellasa calculator-style icon beingdisplayed
there will bea hare icon, selecting this icon will
automatically set the fastest sample rate for the
selected parameters.
Note: The fastest sannple rate set using the 'hare' icon may
be too fast for some applications.
Select the calculator-style icon.
A new screen should now be displayed.
Enter Test Duration
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Test Duration
Enter the required value in milliseconds up toa maximum
of 60,000 mS (1 min). At this stage Datalogger will not
verify if the entered sample interval can be achieved.
When Datalogger is actioned to start recording vehicle
data, and the sample interval is shorter than the fastest
achievable capture time, a warning screen w i l l be
displayed, requesting changes to the sample interval.
Record Time
The record time (test duration) defines the length of the
data slice which will be preserved for analysis after the
fault occurs. The selected time w i l l be split equally before
and after the fault trigger, e.g. a 10 minutes recording w i l l
preserve data from 5 minutes before to 5 minutes after the
fault.
At the end of the record time the PDU will automatically
stop recording.
The record time is entered in the same way as the sample
interval, by enabling the rectangle and selecting the
calculator-style icon.
9-60
September 1996