J.P. Instruments EDM 930 Primary Pilots Guide User Manual

Page 48

For Your Safe Flight

Page 43

Adjusting the HP Value

You must set the nominal horsepower of your engine. This value is used
to calculate the percent horsepower display.

1. Enter the pilot program mode by simultaneously holding the

STEP

and

buttons for five seconds.

Tap

repeatedly until you see Engine HP 200

Then hold both

the

and Button 2 until you see ADJUST momentarily.

3. Adjust the value

PLUS

MINUS

to equal your engines HP.

4. Hold both

and Button 2 until you see SET.

Fuel Flow K factor

The K factor is shown on the fuel flow transducer as a hand written four-
digit number, which represents the number of pulses per tenth gallon of
fuel flow. Before installing the transducer, record its K factor here
_________. The EDM stores the K Factor in the form 29.12, i.e. if the
transducer K factor is 2912, you would enter 29.12 in the EDM’s
K factor field.

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. Fine tuning is
accomplished over multiple flights of sufficient duration and repeatable
conditions. Use the process below to calculate and correct the K Factor
to achieve maximum performance. Note: This process adjusts the K
factor only half of the correction. We recommend this because it
minimizes ‘chasing’ a correction target back and forth.