J.P. Instruments EDM 700/800/711 Pilots Guide - Manual (Page 34)

Page 30 Engine Data Management
For fuel calculations to be accurate, it is imperative that you inform
the EDM of the correct amount of fuel aboard the aircraft. Do not
rely on fuel flow instruments to determine fuel levels in tanks. Refer
to original fuel flow instrumentation for primary information
Section 6 - Long Term Data Memory
The EDM Long Term Data Memory will record and store all displayed
parameters once every six seconds (or at the programmed interval of
between 2 to 500 seconds). At a later time it will transfer them directly
to a laptop PC.
When you retrieve recorded data to your laptop PC you can choose to
retrieve all the data in stored in the EDM, or only the new data recorded
since your last retrieval. In either case, no data in the EDM is erased.
The data will be saved in the PC in a file in a compressed format. The
PC program supplied with the Long Term Data Memory will
decompress the data for display.
The amount of total data that the EDM can store will vary depending on
how rapidly the measured temperatures change. The typical storage is up
to 20 hours at a 6 second interval (1600 hours at 8 minute interval), but
may vary depending on which options are installed. When the memory
becomes full, the oldest data will be discarded to make room for the
newest. In the LeanFind mode you may place a mark at the next data
record by tapping both the STEP and LF buttons simultaneously. You
will see the word
SNAP within the next six seconds, indicating a data
record has been marked. Tap the STEP button to return to the
Automatic mode. Recording begins when EGTs are greater than 500°F
or “snap” is requested.
All data are time-stamped. The EDM Long Term Data Memory contains
a real-time clock that may be reset to local time when you initially
program your instrument. You may also program an aircraft id that will
appear in the output data file. The aircraft id can be your aircraft
registration number or your name. Initially the aircraft ID is set to the
EDM's serial number.
You may change the record interval from 2 to 500 seconds, even in
flight. When you change the interval in flight, the current flight file is
closed, and a new flight file is created with the new record interval.