J.P. Instruments EDM 740 Pilots Guide - Manual (Page 44)

Page 44 Engine Data Management
Section 5 - Long Term Data Memory
The EDM compresses and records all displayed parameters once every
six seconds in Long Term Data Memory (note: you can change this rate
to be 2 to 500 seconds). This data is retrievable by inserting a USB
Drive into the jack on the front of the instrument and following the
prompts. You can choose to retrieve ‘ALL’ the data stored in the EDM,
or only the ‘NEW’ data recorded since your last retrieval. In either case,
the selected data in the EDM is not erased. The data can later be viewed
on EZTrends, a PC program available from JPI or over the internet.
Recording begins when EGTs are greater than 500°F. The amount of
data that the EDM can store will vary depending on how rapidly
parameters change. The typical storage capacity is greater than 150
hours at a 6 second recording interval, but can vary depending on which
options are installed. When the memory becomes full, the oldest data
will be discarded to make room for the newest. All data are time-
stamped. The EDM contains a real-time clock that may be set when you
initially program your instrument. You may also program an Aircraft ID
that will appear in the output data file. We recommend setting Aircraft
ID to your aircraft registration number or your name. Aircraft ID is
initially factory set to the EDM's serial number. You may change the
recording 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 started at the new interval). During built-in tests, the EDM
displays the Model, Date, Time, Percent Memory filled (since the last
download), and the Aircraft ID.
Downloading from Long Term Memory
From either Automatic Scanner or Manual Scanner mode, simply plug a
properly formatted USB Drive into the front panel jack (note: you must
clear any alarms that are present for downloading to commence).
There are three download choices:
‘DUMP NEW’ : download all NEW flights since last download.
‘DUMP ALL’ : download ALL flights in the EDM memory.
‘DUMP EXIT’ : EXIT the download mode.
Tap the LF button to select a choice, then Tap STEP button to execute.
CAUTION: Do not insert anything but a USB Flash Drive Stick
in the USB Port!