J.P. Instruments EDM 740 Pilots Guide - Manual (Page 42)

Page 42 Engine Data Management
Resetting ‘USED’
Every time you inform the EDM that the aircraft is refueled, the amount
of fuel USED is automatically set to zero (unless the instrument is
programmed to ACCUM? Y ). To manually zero the amount of fuel
USED at any time, manually STEP to display USED and then hold
both buttons until the display shows ‘0 USED
’ (this normally takes about
five seconds.
Accumulate — Trip Totalizer
To have the USED parameter continuously accumulate total consumed
fuel, set ACCUM? Y. This is typically done if you want to track the
total fuel consumed over a multi-stop cross country. ‘Accumulate’ is
described in ‘Pilot Programming’ beginning on page 45. Note: typically,
ACCUM? is set to ‘N’ so that USED will be reset every time you fuel
the aircraft.
Fuel Flow Display Select Switch
The select switch is a three-position toggle switch mounted on your
instrument panel near the display of the EDM. It selects one of three
different sets of parameters to be displayed by the Scanner:
 In the EGT (Temperature) position only the installed
temperature (and battery voltage) parameters are displayed.
 In the ALL (All) position, the EDM both installed
temperature and fuel flow parameters are displayed.
 In the FF (Fuel Flow) position only fuel flow parameters are
displayed.
Alarm warnings appear regardless of the select switch setting. Alarms
are displayed in the digital display in either Automatic or Manual
Scanner modes. The select switch does not affect the analog display.
Parameter Scan—Systems with Fuel Flow Option
Listed below is the scan sequence, parameter description and an example
of the digital display. The first column indicates what position the select
switch must be in to display that particular parameter. T=EGT, F=FF
and A= ALL.