J.P. Instruments EDM 740 Pilots Guide - Manual (Page 49)

For Your Safe Flight Page 49
RATE 4 hold STEP and LF buttons
simultaneously for several seconds to
access the next sequence.
ORIG T ?N N
 Y Y—Yes—selects factory original TIT
probe and proceeds to the next step.
TIT +0 - 975 … + 975 Tap the LF button to lower the
correction; hold the LF button to raise
the correction.
For example, if the EDM reads 100 less
than the aircraft’s TIT gauge, set the
display to read
TIT + I00 .
Tap STEP button to exit the procedure.
Section 10 - Programming the Fuel Flow Option
Fuel Flow Parameters
Three additional parameters may be set by the pilot when the Fuel Flow
Option is installed:
 K Factor—the fuel flow transducer calibration constant.
 Accumulate—default is OFF: resets the fuel used to 0 every time
you inform the EDM that the aircraft was refueled. With accumulate
ON, fuel used will continue to accumulate for all subsequent flights.
 GPS Communications fuel data format.
K Factor
The K factor is shown on the fuel flow transducer as a four-digit
number, which is the number of pulses generated per tenth gallon of fuel
flow. Before installing the transducer, write down the K factor here
_________. To enter the number into the EDM, place a decimal point
two places from the right of the number. For example if the K factor
written on the fuel flow transducer is ‘2912’ enter 29.12 in the EDM K
factor parameter field.
The K factor can be changed in the pilot programming procedure. When
the K factor is changed during a trip, calculations of fuel used, fuel
remaining and time to empty are not retroactively recalculated.
Fine Tuning the K Factor
The K factor shown on the fuel flow transducer does not take into
account your aircraft’s particular installation. Fuel hose diameters and
lengths, elbows, fittings and routing can cause the true K factor to be
different from that shown on the fuel flow transducer.
You must use the following procedure to fine tune the K factor.