EDM-760 Pilots Guide

EDM-760 Quick Reference Guide

How to use LeanFind 

(page 13)

PEAK EGT

Pre-lean the mixture

Tap LF button

Lean the mixture

Stop at peak

Enrich to peak or

100° rich of peak

How to Change Modes (page 7)

EDM-760 enters Automatic indexing mode two minutes after power up

A U T O I N D E X : p a r a m e t e r s i n d e x e d a u t o m a t i c a l l y t a p L F b u t t o n , t h e n S T E P b u t t o n t a p L F b u t t o n t a p S T E P b u t t o n t a p S T E P b u t t o n

L E A N F I N D : s t a r t s

L e a n F i n d p r o c e d u r e

M A N U A L

I N D E X : p a r a m e t e r s i n d e x e d w h e n

S T E P i s t a p p e d t a p b o t h

S T E P a n d L F

s i m u l t a n e o u s l y r e l e a s e b u t t o n s

L F h o l d L F b u t t o n r e l e a s e L F b u t t o n

D i s p l a y s p e a k

E G T v a l u e

T o g g l e i n c l u d e / e x c l u d e p a r a m e t e r i n i n d e x i n g

How to …

interpret CHT trends page 6

lean turbocharged engines page 19

diagnose engine problems page 23

calibrate OAT readings page 37

change from °F to °C page 37, 44

dump data to a PC page 36

reset an alarm page 26

set start up fuel page 29

accumulate total fuel page 30 reset fuel used page 30

set fuel tank capacity page 47

set K factor page 41

Note Tank size can be entered by holding in the step button upon start-up.

Specifications

FAA Approved

Indicator TSO & STC

Fuel Flow Option STC

Display Size:

3 1/8 in panel mount

3.5 in. sq., 7.5 in. deep

Common Mode Range:

+ 4v, rejection > 80db

Analog Thermocouples

Response curve: All Linearized.

Resolution: 1.0 oF

Accuracy: + 1.0 oF

Calibration: type K (J CHT avail.)

Operating Temperature Range:

-40 to 195 oF

Temperature Range:

EGT bar graph: variable

EGT, TIT digital: -40 to 2500 oF

CHT, OAT, IAT: -40 to 800 oF

Analog input channels:

12 Exhaust Gas Temperature (EGT)

12 Cylinder Head Temperature (CHT)

2 Turbine Inlet Temperature (TIT)

2 additional channels

(either OIL, CRB or second TIT)

1 Outside Air Temperature (OAT)

1 System Bus Voltage (BAT)

Resolution and Display Range (Fuel Flow Option) display maximum display value

K factor range: 5,000 to 99,990

Fuel flow: Accuracy (8 to 60 GPH)

140.0 GPH at K factor 85,000

410.0 GPH at K factor 29,000

820 PPH at K factor 85,000

2400 PPH at K factor 29,000

560 LPH at K factor 85,000

1640 LPH at K factor 29,000

372 KPH at K factor 85,000

1088 KPH at K factor 29,000

Fuel Remaining: 999.9 Gal

999 Lbs., L, or Kg

Fuel Used: 999.9 Gal.

9999 Lbs., L, or Kg

Time to Empty: 50 hours resolution

10

1 %

0.1 GPH

0.1 GPH

1 PPH

1 PPH

1 LPH

1 LPH

1 KPH

1 KPH

0.1 Gal

1 Lb., L, or Kg

0.1 Gal

1 Lb., L, or Kg

1 minute

Long Term Memory

Data capacity: up to 17 hours sampled every 6 seconds

Recording rate: programmable, every 2 seconds to 500 seconds

Pilot’s Guide

EDM-760 TWIN

Copyright  1999, 2001, 2003, 2004, 2005 J.P. Instruments, Inc.

All Rights Reserved

Printed in the United States of America

J.P.INSTRUMENTS

Information: P. O. Box 7033

Huntington Beach, CA 92646

3/15/2012 13:29:00 a3/p3

Factory: 3185-B Airway Avenue

Costa Mesa, CA 92626

(714) 557-5434 Fax (714) 557-9840 jpinstruments.com

,

JPITech.com and BUYJPI.com

Rev L

Table of Contents

Section 1 - Introduction

Section 2 - Displays and Controls

Section 3 - Operating Procedures

Section 4 - Diagnosing Engine Problems

Fuel Flow Option Operation

Long Term Memory

Personalizing

Fuel Flow Option—Formats, Diagnostics

Section 5 - Option Connector Pin Assignments

Reference Reading

Section 6 - Technical Support

Limited Warranty

Index

28

34

37

48

11

23

1

4

50

51

51

52

53

Section 1 - Introduction

Product Features

EDM-760 Standard Instrument:

• Hands-free, automatic scanning

• Bar graph

• LeanFind  mode

• Battery voltage

• Normalize view

• DIF low to high EGT spread

• Shows largest EGT variance

• Oil temperature option

• EGTs to 1°F resolution

• Shock cooling monitoring

• Outside air temperature (OAT) option

• User selectable index rate

• Alarm “red line” limits

• Fast response probes

• Real-time serial data port

Fuel Flow Option:

• Solid-state pulse generating rotor fuel flow transducer

• Fuel quantity measured in gallons, kilograms, liters, or pounds

• Low fuel quantity alarm

• Low fuel time alarm

• GPS interface

• Instantaneous fuel flow rate,

• Total amount of fuel consumed,

• Total fuel remaining, and

• Time to empty at the current fuel flow rate.

Long Term Memory:

• Records and stores data every 2 to

500 seconds

• Non-volatile memory

• Post-flight data retrieval

• Data retrieval software

• 17 hours data capacity at 6 second sample rate

Engine Data Management

The EDM-760 Engine Data Management system is the most advanced and accurate piston engine monitoring instrument on the market. Using the latest microprocessor technology, the EDM-760 will monitor up to twenty-four critical measurements in your engines, three times a second, with a linearized thermocouple accuracy of better than 0.1 percent or 2°F.

As your built-in flight engineer, the EDM-760 is constantly “red line” checking: all critical measurements are automatically checked several times a second, regardless of the current display status. Leaning is accomplished quickly and automatically using the LeanFind  procedure.

With the EDM-760 it is now possible to have substantially more diagnostic information available to you in a timely and usable manner.

The included data memory permits you to record all measurements for later down loading to your laptop or Palm handheld.

Benefits of Proper Mixture Control

•

•

•

•

Improved engine efficiency • costs

Greater fuel economy •

Smoother engine operation •

Longer spark plug life

Reduced maintenance

Reduced operating costs

Proper engine temperatures

• Reduced engine vibration

JPI Probes

Temperature information processed by the EDM-760 is captured by fast

response, grounded JPI temperature probes, that accurately measure the small temperature changes—as small as 1°F—that occur during mixture adjustment.

cylinder head

CHT probe exhaust manifold

EGT probe

Temperature and Mixture

In a piston engine only a small portion of the energy from combustion produces movement of the piston during the power stroke. The majority of energy passes into the exhaust pipe as hot gasses. By monitoring the temperature of these exhaust gasses you will have an indication of the quality of the combustion process. Low compression, non-uniform fuel distribution, faulty ignition, and clogged injectors diminish the efficiency of the combustion process that generates power.

From the cockpit you can adjust the fuel/air ratio by a process called

leaning. Retarding the mixture control changes the fuel/air ratio and hence the resulting Exhaust Gas Temperature (EGT).

The following figure depicts the mixture and temperature relationship.

Page 2 Engine Data Management

100

95

90

85

80

-100

-200

-300

0

Peak

Power

Specific fuel con sumptio n

Best power range

Best economy range

Peak EGT

EGT

CHT

Percent power

20

0

-20

-40

-60

-80

Full Rich

(Take-off)

Rich Lean

Leaner Mixture

Too lean

As the mixture is leaned, EGT rises to a peak temperature, and then drops as the mixture is further leaned. Peak power occurs at a mixture using more fuel than at peak EGT. Best economy occurs at peak EGT. Accurate leaning yields optimal engine temperatures. By being able to precisely adjust the mixture, your engines can produce either the highest fuel economy or maximum power, whichever you choose.

A single EGT gauge merely gives you an average of each cylinder’s temperature: some cylinders can be too rich, while others too lean.

Variations produced by differences in fuel distribution, ignition, and compression will cause each cylinder to follow its own mixture and temperature relationship such that one cylinder will reach peak before another.

For Your Safe Flight Page 3

Section 2 - Displays and Controls

The EDM-760 monitors engine temperatures and voltages, assists in adjusting the fuel/air mixture, and helps diagnose engine malfunctions.

There are three components of the user interface:

• Analog display including cylinder number and index dot

• Digital display for numeric readouts and messages

• Two front panel operating buttons.

Displays

Analog Display

The upper half of the face of the EDM-760 is the analog display.



D i g i t a l t e m p e r a t u r e i n ° F o r ° C

 D o t i n d i c a t e s w h i c h c y l i n d e r t e m p e r a t u r e s a r e s h o w n i n t h e d i g i t a l d i s p l a y

 N o r P i n d i c a t e s

N o r m a l i z e o r

P e r c e n t v i e w



E x h a u s t G a s

T e m p e r a t u r e

( E G T ) i s t h e t o p o f t h e c o l u m n

° F L R P

1 2 3 4 5 6 T 1 2 3 4 5 6 T

_



C H T s h o w n o n c a l i b r a t e d s c a l e

C H T

5 0 0

4 0 0

3 0 0

_

%

M A X

T I T b a r g r a p h ,

O I L a s m i s s i n g s e g m e n t

E G T b a r g r a p h r a n g e is

8 2 5 ° F ( h a l f r e d l i n e ) t o

1 6 5 0 ° F

I4 0 I I4 5 2

3 9 0 3 6 3

E D M - 7 6 0

S T E P L F J P I



C y l i n d e r H e a d

T e m p e r a t u r e i s s h o w n a s a m i s s i n g b a r

The following is a description of the analog display, from top to bottom.

Numbers in circles refer to features in the above diagram.

 Temperature Units (°F or °C)

• °F temperatures in the digital display are in Fahrenheit degrees.

• °C temperatures in the digital display are in Celsius degrees.


To change the display of OAT see “Pilot Programming” on page 37. To

change the display of engine temperatures see “Changing the Alarm

Limits” on page 44.

 Cylinder Numbers and Dot Index

A row of numbers 1 through 6 and the letter T are the column labels for the analog display. The 1 through 6 are the cylinder numbers. If the TIT option is installed, the T denotes the last column is displaying Turbine

Input Temperature (TIT). If the T is absent and the Oil temperature option is installed, the last column displays Oil temperature. If both TIT and Oil temperature options are installed, the last column displays TIT and the missing segment displays OIL. A round dot under the numbers 1 through 6 indicates that particular column is shown numerically in the

EGT and CHT digital display.

 Normalize and Percentage View Indicators

• Percentage view: when there is a P at the top of the display, the columns indicate percent of EGT red line. Each column is composed of a stack of segments. A maximum height column depicts 100 percent of red line and a one segment-high column depicts 50 percent of red line. For example, if the red line is 1650°F, a maximum height column represents 1650°F and a one segment-high column represents half that value, or

825°F. The Percentage view permits comparison of EGTs

across all cylinders. Hotter cylinders display higher columns than cooler cylinders.

• Normalize view: when there is an N at the top of the display, the EGT columns are displayed normalized. When you change to the Normalize view, all column peaks are set to the same half-height level for trend analysis. Any changes are shown as an increase or decrease in column height. A onesegment change in column height represents a 10°F change.

The Normalize view permits rapid visualization of EGT

trends, rather than a percentage of red line. You may use normalize in level cruise.

To toggle between Percentage and the Normalize views, hold the LF

button for three seconds. The analog display becomes half height and the display changes to the Normalize view. Selecting the Normalize view does not affect the digital display nor alter the measurement sequence. The


CHT display—described later—is not affected by the Normalize or

Percentage view.

You may select the Normalize view in either the Manual or Automatic indexing mode. Normalize view is most helpful for engine trend monitoring of each cylinder’s operation. For example using the Normalize view during engine run-up, a fouled spark plug will appear as a higher column.

A common mistake is to be in the Normalize view and then change your power setting, causing all columns to go off scale, high or low. Set to the

Percentage view before adding or reducing power. Always set Percentage

View when beginning your descent.

 Bar Graph EGT and CHT

Each column in the bar graph is composed of a stack of segments. The total height of each column represents the EGT and the missing segment in the column represents the CHT trend.

• In the Percentage view, the EGT and TIT (or

Oil temperature) columns’ resolutions depend on the programmed red line limits.

• CHT is displayed by a missing segment or a single isolated lighted segment, in 25°F increments.

The CHT display is the not affected by mode or view.

C H T

5 0 0

4 0 0

3 0 0

Digital Display

Beneath the bar graph is the 9-segment alphanumeric display.

EGT and CHT

When the dot index is beneath a cylinder number, 1 through 6, the digital display shows the EGTs on the top (four digits for each engine) and the

CHTs on the bottom (three digits for each engine). Other measurements are displayed in the digital display as described in the subsection

“Measurement Indexing—without Fuel Flow Option” on page 10.


C H T s h o w n o n c a l i b r a t e d s c a l e

4 d i g i t d i s p l a y o f

E G T

L e f t E n g i n e

3 d i g i t d i s p l a y o f C H T

L e f t E n g i n e

C H T

5 0 0

4 0 0

3 0 0

° F L R P

1 2 3 4 5 6 T 1 2 3 4 5 6 T

_

I4 0 I I4 5 2

3 9 0 3 6 3

E D M - 7 6 0

S T E P L F

J P I

_

%

M A X

4 d i g i t d i s p l a y o f

E G T

R i g h t E n g i n e

3 d i g i t d i s p l a y o f C H T

R i g h t E n g i n e

Display Dimming

The entire display panel features automatic dimming. Allow ten seconds for the display to adjust to ambient lighting conditions.

Modes

There are three standard operating modes of the EDM-760: Automatic

indexing, Manual indexing, and LeanFind. These modes will be

described in more detail beginning on page 11. Most of the time you

will operate the EDM-760 in the Automatic indexing mode. When you first turn on the power the EDM-760 starts in the Manual indexing mode, but will enter the Automatic indexing mode after two minutes. The three modes affect primarily the digital display.

Automatic Indexing Mode

Just tap the LF button, then tap the STEP button. No user intervention is required to use this mode. Each cylinder and each measurement value is automatically sequenced and shown in the digital display for a few seconds.

Manual Indexing Mode

Just tap the STEP button. Automatic Indexing stops. Each indexed measurement is frozen in the digital display until you manually index to the next measurement by tapping the STEP button.


LeanFind Mode

Simply pre-lean, tap the LF button and begin leaning. The EDM-760 will assist you in finding the first cylinder to peak.

Buttons

Buttons, Front Panel

Two operating buttons control all functions of the EDM-760.

The term tap will be used to denote pressing a button momentarily. The term hold will be used to denote pressing and holding a button for five seconds or longer.

STEP Button

Located on the lower left side near the instrument face.

• In the Automatic indexing mode, tapping the STEP button will stop indexing and change to the Manual indexing mode. Then each tap of the STEP button will display the next measurement in the sequence.

• In the LeanFind mode tapping the STEP button will terminate the LeanFind mode and change to the Automatic indexing mode.

Secondary functions of the STEP button include:

• In the Manual indexing mode holding the STEP button will display the previous measurements in the sequence (rapidly backwards).

•

In the programming procedures, described on page 37, tapping

the STEP button will advance to the next item in the list.

•

When an alarm is displayed (“Alarms” are described on page 43),

tapping the STEP button will temporarily delete that measurement from the sequence for the next ten minutes.

• When an alarm is displayed, holding the STEP button until the word OFF appears will delete that measurement from the sequence for the remainder of the flight.


LF Button

Located on the lower right side near the instrument face.

• In Automatic or Manual indexing modes, tapping the LF button will change to the LeanFind mode.

• In Automatic or Manual indexing modes holding the LF button for three seconds will toggle between Percentage and

Normalize views.

P: Percentage view hold LF button

for 3 seconds

N: Normalize view

• In the LF mode holding the LF button after peak EGT is found will display peak EGT.

• In the LF mode tapping the LF button twice will mark a data record in memory.

Secondary functions of the LF button include:

• In the pilot programming procedure, holding or tapping the

LF button is used to increment or decrement parameter values and toggle between yes and no answers to questions.

STEP and LF Buttons

• Holding both the STEP and LF buttons simultaneously for five seconds changes to the pilot programming procedure.

• Holding both the STEP and LF buttons simultaneously for five seconds after tapping LF but before beginning to lean will toggle between Rich of Peak and Lean of Peak

• Tapping both the STEP and LF buttons simultaneously in

Manual indexing mode toggles to include or exclude the displayed measurement from the Automatic indexing mode. It has no affect on the displayed measurements in the Manual indexing mode.


Measurement Indexing—without Fuel Flow Option

The EDM-760 steps through the engine measurements in a specific sequence. Listed below is the indexing sequence, measurement description and example of the digital display.

Measurement

Voltage, System Bus

Outside Air

Temperature

Example

I4.2

8I BAT

OAT

Comments

Battery voltage and OAT °F or °C

Difference between hottest and coolest

EGT

Dot indicates most widely deviating cylinder

EGT, CHT

TIT, Turbine Inlet

Temperature

Oil Temperature

I370

I450

TIT

TIT

I 7 7

I80

OIL

OIL

80

EGT

52

DIF

DIF

I340

I430

376

385

EGT, left, CHT, right. Dot indicates cylinder

TIT #2 Second Turbine

Inlet Temperature

Carburetor Temperature

I450

I460

T I2

T I2

20

25

CRB

CRB

Only one of these three options may be installed in the aircraft


Shock Cooling -30

-40

CLD

CLD

Dot indicates fastest cooling cylinder

The display will pause at each measurement for four seconds in the

Automatic indexing mode. (The four second indexing rate can be changed.

See “Pilot Programming” on page 37.) In the Manual indexing mode, tap

the STEP button to advance to next measurement. Only the measurements for the options that are installed will be displayed; uninstalled measurements will not appear.

Section 3 - Operating Procedures

Diagnostic Testing on Startup and During Flight

When your EDM-760 is first turned on, all digits light up for a few seconds, permitting you to check for non-functional segments. Then each column is self-tested in sequence while the EDM-760 tests internal components, calibration and integrity of the probes. If a problem is found, it will be displayed as OPEN PRB or CAL ERR, followed by the name of the probe or channel. During flight, probes are constantly checked for inconsistent or intermittent signals. A faulty channel or probe encountered during start-up or during flight will be deleted from the sequence, producing a missing column or blank digital data.

Modes

The EDM-760 has three different operating modes: Automatic indexing,

Manual indexing and LeanFind. When you first turn on the power the

EDM-760 starts in the Manual indexing mode, but will enter the

Automatic indexing mode after a few minutes. The Automatic indexing mode provides you with engine monitoring information for the majority of flight conditions. To adjust the mixture, use the LeanFind mode. And to display specific measurements, use the Manual indexing mode. In both the

Automatic and Manual indexing modes the analog display shows a bar graph of EGT and CHT for each cylinder and the TIT, if installed (or Oil temperature, if it is installed and TIT is not installed).


Automatic Indexing Mode

Just tap the LF button, then tap the STEP button. No user intervention is required to use this mode. In the Automatic indexing mode the EDM-

760 displays the measurement sequence at a user-selected indexing rate

(see “Personalizing” on page 37).

Individual measurements can be excluded from the Automatic indexing

mode: tap STEP to enter the Manual indexing mode. Tap STEP to index to the measurement you want to exclude. Then tap both the STEP and LF buttons simultaneously. Excluded measurements display a decimal point before the measurement name.

For example:

Included I84 OIL Excluded

↓

I84



OIL

Tapping the STEP and LF buttons simultaneously will toggle back and forth between include and exclude.

• You can program whether every time you turn on the EDM-760, it will remember which measurements were excluded or defaults to none

excluded. See on page 45.

• All installed measurements are always displayed in the Manual indexing mode. Exclusion only applies to the Automatic indexing mode.

• All measurements are checked for alarm conditions every second

regardless of their included or excluded status.

Manual Indexing Mode

Just tap the STEP button. Use the Manual indexing mode when you want to monitor one specific measurement such as shock cooling during descent, or a particular cylinder temperature during climbs. To change to the Manual indexing mode, tap the STEP button once. Subsequent taps will index the digital display through the measurement sequence (see

“Measurement Indexing—without Fuel Flow Option” on page 10). To

exit the Manual indexing mode and return to the Automatic indexing mode, either tap the LF button and then tap the STEP button (see “How


to Change Views” in the front of this manual). You may disable the

Automatic indexing mode. See “Personalizing” on page 37.

LeanFind Mode—Leaning Rich of Peak

• JPI’s EDM-760 provides two methods of leaning: lean

rich of peak ( LEAN R) or lean of peak (LEAN L). The standard method is to lean about 20° rich of peak. With the advent of GAMI injectors it is now possible to set the mixture lean of peak—saving fuel and running the engine cooler.

Teledyne Continental recommends lean of peak for the Malibu.

This manual primarily describes the rich of peak method, and provides the procedure for the lean of peak method. The factory default method is set to rich of peak, but you can change this to lean of peak.

See Changing the Alarm Limits

Procedure on page 45.

Simply pre-lean, tap the LF button and begin leaning. Upon reaching cruise configuration, you will use the LeanFind mode to identify the first cylinder to reach peak EGT.

A more detailed explanation of the LeanFind procedure follows this stepby-step procedure.


85

90

80

100

95

Best power range

Best economy range

-50

-100

0

EG

T First cylinder to peak. Use for

Rich of Peak leaning

CHT

Perce nt po wer

GAMI spread

Rich

Spe cific

fue l co nsu mpt ion

Peak Power

Lean Too lean

Last cylinder to peak. Use for

Lean of Peak leaning with GAMI injectors

-20

-40

0

20

-60

80

-


LeanFind Procedure—Step-by-Step

Procedure

1 Establish cruise at approx.

65 to 75% power.

2 Pre-lean the mixture to 50°F on the rich side of the estimated peak EGT on any cylinder: _____°

3 Wait one minute

4 Tap the LF button

Example

I490

370

5 Slowly lean the mixture— approx. 4°/second—while observing the display. When there is a 15°F rise in EGT,

LeanFind mode becomes active.

I490

LF

I520

LF

(Fuel Flow

Option shows flow)

6 Stop leaning when a column begins flashing.

You will see PEAK EGT for two seconds, followed by:

I550

SET or with

Fuel Flow

I550

I 2.4

7 If you hold LF, peak EGT will be displayed while the LF button is held down.

8 Slowly enrich the mixture. the temperature will increase, returning to peak.

Stop enriching at the desired

EGT.

Best economy

Best power

I560

PEAK

I560 SET

I560 SET

I460 SET

Comments

*For your first flight with the

EDM-760, use the method shown below.

Let engine stabilize.

Start the LeanFind mode.

Flashing cylinder number indicates hottest cylinder and that LeanFind mode is active.

Flashing cylinder number & column indicates leanest cylinder. (SET means that the peaked cylinder is “set” into the display.) Due to thermal inertia this will usually be about 10°F lean of peak.

Captured peak EGT value is displayed.

• Peak EGT for best economy

• 100° cooler than peak for best power

Best power

Temperature when column flashes richer leaner best economy

*Here is how to determine the pre-lean value: while in cruise at under 65 percent power, choose any cylinder and lean that cylinder to peak EGT in the Manual indexing mode or to engine roughness, whichever occurs first.

Note the peak, subtract 50° and write the resulting number in the space provided in step 2.


LeanFind Procedure—General Explanation

Lycoming and Continental engines have established specific restrictions on leaning that must be followed, such as percentage of power, climb leaning, and TIT limits. Lycoming recommends operation at peak EGT for power settings of

75% or lower, while Continental recommends operation at peak EGT for power settings of 65% or lower. This guide is not meant to supersede any specific recommendations of the engine manufacturer or airframe manufacturer.

It is your responsibility to know your aircraft’s limitations.

Pre-lean the mixture to about 50° below peak. After pre-leaning, wait for one minute for the temperatures to stabilize. Next, begin the leaning process by tapping the LF button.

The LeanFind procedure will begin on the first engine you lean — the one that first indicates a 15° EGT temperature rise. The examples below assume the left engine is leaned first. Begin leaning the mixture. When a

15° rise occurs, the LeanFind mode becomes activated, shown when the cylinder number above the column of the hottest cylinder begins flashing.

LeanFind is not active if a cylinder number is not blinking.

With the Fuel Flow Option, instead of seeing the word LF in the display, you will see numerical fuel flow rate during the leaning process on the right side of the digital display. This allows you to observe the EGT rise and at the same time watch the fuel flow rate decrease.

To show the progress of the leaning process, the EDM-760 selects the hottest cylinder for reference in the digital display. In the example below, the I360 is the current temperature of the hottest cylinder. If the fuel flow option in installed, instead of LF you will see the fuel flow rate, for example I2.4.


W h e n L F i s a c t i v a t e d :

T o s h o w t h e p r o g r e s s o f t h e l e a n i n g p r o c e s s , t h e E D M - 7 6 0 s e l e c t s t h e h o t t e s t c y l i n d e r f o r r e f e r e n c e i n t h e d i g i t a l d i s p l a y .

D o t o f h o t t e s t c y l i n d e r f l a s h e s w h e n E G T r i s e s 1 5 ° a n d i s a r m e d t o p e r f o r m

L e a n F i n d

C H T

5 0 0

4 0 0

3 0 0

° F L R P

1 2 3 4 5 6 T 1 2 3 4 5 6 T

_

_

%

M A X

T e m p e r a t u r e a n d " L F " d i s p l a y e d

I3 6 0 I4 5 2

L F

E G T

E D M - 7 6 0

S T E P L F J P I

Continue leaning slowly without pausing. With a vernier mixture control, turn the knob about a quarter turn every five seconds. With a non-vernier or quadrant mixture control, lean slowly and smoothly about 1/16 inch every five seconds. Eventually, one cylinder will reach peak before any of the other cylinders. The EDM-760 will determine this automatically.

Notice that this cylinder does not necessarily have the hottest EGT.

The EDM-760 will indicate success in finding a peak by displaying the words PEAK EGT for two seconds, followed by flashing the column of— and displaying the value of—the EGT of the cylinder that peaked first.

The word SET will also be displayed. (With the Fuel Flow Option the current fuel flow rate will be displayed on the right side of the digital display instead of the word SET.) The flashing cylinder will be locked — or set—into the digital display during the remainder of the LeanFind procedure to allow you to set the final mixture. The peak EGT value is remembered by the EDM-760 and will be displayed as long as you hold the LF button.

You may now enrichen the mixture to operate at peak or continue enriching to 100° rich of peak, or a value of your choice, consistent with


the procedures defined in your aircraft engine manual. If you tap the LF button, the digital display will toggle between displaying the peak EGT or the number of degrees below peak.

If you lean too much, the EGT will drop and the engine will be operating lean of peak.

L e a n i n g R I C H o f P e a k

" P E A K E G T " d i s p l a y e d f o r t w o s e c o n d s w h e n p e a k i s f o u n d

P E A K

E G T d o t i n d i c a t e s

L E A N E S T c y l i n d e r a n d f l a s h e s c o l u m n o f

L E A N E S T c y l i n d e r f l a s h e s

E G T o f t h e

L E A N E S T c y l i n d e r d i s p l a y e d w i t h t h e w o r d " S E T "

C H T

5 0 0

4 0 0

3 0 0

° F L R P

1 2 3 4 5 6 T 1 2 3 4 5 6 T

_

I5 6 0 I4 5 2

S E T

E D M - 7 6 0

S T E P L F

J P I

_

%

M A X

Lean of Peak Leaning with GAMI injectors

To use the “lean of peak” method, tap LF and then immediately hold both STEP and LF until you see LEAN L. Once you begin leaning (flashing dot) you cannot change leaning methods. You may toggle back to LEAN R by holding both buttons again.

In the “lean of peak” method the columns will invert with the first to peak progressing down from the top of the display. The inverted column scale is 5° per segment below peak. As you continue to lean past peak the dot of the each successive cylinder will flash as it peaks. The peaks will be shown as an inverted bar graph; when the last cylinder peaks its column will flash. The analog display is an inverted bar graph showing where each cylinder peaked. When the

LF button is held the display will show the delta fuel flow between


the first and last to peak (GAMI Spread), as well as the richest peak EGT.

L e a n i n g L E A N o f P e a k

L a r g e s t c o l u m n i s t h e f i r s t c y l i n d e r t o p e a k

S h o r t e s t c o l u m n is t h e l a s t c y l i n d e r t o p e a k

T e m p e r a t u r e b e l o w p e a k o f t h e l a s t c y l i n d e r t o p e a k

C u r r e n t f u e l f l o w r a t e

C H T

5 0 0

4 0 0

3 0 0

° F L R P

1 2 3 4 5 6 T 1 2 3 4 5 6 T

_

_

%

M A X

- 5

7 .3

E G T

E D M - 7 6 0

S T E P L F

J P I

Fine Tuning the Mixture

Fuel flow is the critical issue in the leaning process. Uniform fuel distribution to all cylinders results in the best economy and smooth operation. Estimate the uniform fuel distribution by the heights of the

EGT columns on the analog display. Uniform fuel balance among all cylinders occurs when the heights of the columns, displayed in Percentage view, are uniform. Minor adjustments in throttle position, RPM, and mixture settings can dramatically improve uniformity of the fuel distribution. In fuel injected engines, interchanging injector nozzles between high and low EGT cylinders will improve fuel distribution in many cases.

If you tap STEP, scanning will resume. Or instead, if you tap LF you will return to the inverted bar graph, which can be used for fine tuning. To begin the LeanFind procedure anew, tap LF a second time.

Turbocharged Engines

The leaning process for turbocharged engines is by reference to the first cylinder or TIT to reach peak. However, the TIT factory red line may


limit the leaning process. TIT red line is generally 1650°F, and up to

1750°F in some installations. If during leaning the TIT exceeds red line by less than 100°, the LeanFind procedure will continue to operate and the

TIT redline alarm will be suppressed for one minute, allowing you to complete the leaning process. Otherwise the digital display will show, for example, I650 TIT and TIT will flash. You will notice that in some cases the TIT reads 100°F hotter than the hottest EGT. This is caused by unburned fuel in the exhaust igniting at the turbine inlet.

The reduced size of the JPI Hastaloy-X-tip probes produces faster response and more accurate than the massive factory installed probe.

Therefore JPI probes may read as much as 100°F higher than the factory installed probe. However, note that the engines were certified with the factory installed probe and gauge, and this gauge reading is the limiting factor when adjusting your engines.

Never exceed red line on the factory installed instruments.

Operation for each Phase of Flight checklist.)

Engine Run-Up (you can add this to your run-up

Suggested setup:

• Set engine to runup RPM

• Normalize view

• Manual mode

Verify:

• uniform rise of about 50°F in all EGTs in single magneto operation.

• uniform rise of EGTs with application of the mixture control.

Be alert for:

• unusually low voltage (less than nominal battery voltage)

• cold OIL and normal oil pressure

• abnormally high CHT

• large drop in EGT on one cylinder in single magneto operation— may be fouled spark plug.


Take-Off, Climb, and Full Throttle Operations


• Percentage view

• Automatic mode

Verify:

• EGTs and CHTs consistent with past climbs. EGTs should be in the 1100 to 1300°F range (100° to 300°F cooler than cruise) due to fuel cooling.

Be alert for:

• high EGT in one cylinder, 300°F above the others may indicate plugged injector or leaking manifold gasket on a carbureted engine.

• If all EGT columns go off scale to the top of the column, be sure you are not in Normalize view, as indicated by the symbol NRM to the left of the horsepower display.

At high density altitude an overly rich mixture can significantly reduce engine power.

Cruise

After the engine is warmed up, use LeanFind to lean the mixture.


• Normalize view

• Automatic mode

Be alert for:

• uneven EGTs (injected engines). Make fine adjustments to throttle, then RPM, then mixture to level the display columns.

•

abnormal patterns of EGTs and CHT. (see “Engine Diagnosis

Chart” on page 24).

Descent


• Percentage view

• Manual mode


Be alert for:

• CLD: shock cooling alarm is set to -60°F. Average cool rates of

-40°F/minute to –60°F/minute are normal, depending on the engine size.

Common Misapplications

Some of the more common misapplications made by first-time EDM-760 users are presented here in an attempt to help you avoid similar problems.

Problem finds a premature

“false” peak.

Peak not found

Off-scale EGT bars, too high or low

First cylinder to peak is not the hottest

EGTs rise during single magneto check

EGTs not uniform during low power operation

Cause Correction

Failure to pre-lean before performing LeanFind.

Pausing during leaning.

Follow the pre-lean procedure on page

13.

Lean continuously, do not pause.

Lean more quickly.

Retarding mixture too slowly.

Leaning too quickly.

EDM-760 is in the

Normalize view and later observe off-scale EGT bar readings.

This is normal. The first to cylinder peak is unrelated to the hottest.

This is normal, due to

Lean at the speed of approx. 10°F per sec.

Set to Percentage view incomplete combustion persisting longer.

This is normal. Fuel and air distribution is not optimal at low power settings.


Section 4 - Diagnosing Engine Problems

Normal Engine Limits

The follow chart lists typical normal measurement values that you will observe for most general aircraft engines.

Measurement Normal range Comments

EGTs in Cruise

EGT span (DIF)

TIT

CHTs

1350°F

1550°F

70 to 90°F

120 to 150°F

1600°F average

350°F(OAT 60°F)

410°F

• under 200 HP

• high performance

• EGT should drop

200°F when full throttle is applied

• fuel injected

• carbureted

• 100° higher than

EGT

• normally aspirated

• Turbocharged

CHT span

OIL

50 to 70°F

200°F • oil cooler thermostat opens at 180°F

Shock cooling* -40°/minute

-55°/minute

-200°/minute

• tightly cowled

• Bonanza

• helicopter

* Maintain a cooling rate of less than -60°/minute. You will find that the cylinder with the greatest shock cooling will shift from front cylinders

(during climb out) to the rear cylinders (during descent ).

If one CHT is reading 20° to 50° above or below the others, this may be due to that cylinder having a spark plug gasket probe instead of a bayonet probe. This is necessary because the aircraft’s factory original CHT probe is occupying the socket in the cylinder head rather than the EDM-760.

This is normal. If the discrepancy is greater, be sure the spark plug gasket probe is mounted on the top spark plug. An adapter probe is available to occupy the same socket as the factory original probe. Contact your dealer.


Engine Diagnosis Chart

The following chart will help you diagnose engine problems in your aircraft. (Views are Percentage views). Notice that there is always one

CHT that is shown hotter than the others.

Display Symptom

50%

75° to 100° rise for one cylinder during flight

Probable

Cause

Spark plug not firing due to fouling, faulty plug, lead or distributor.

Recommende d Action

Enrich mixture to return EGT to normal.

Have plugs checked.

50%

50%

Increase or decrease after ignition system maintenance

Loss of EGT for one cylinder.

Engine rough

Improper timing: high EGT → retarded ignition; low EGT → advanced ignition.

Stuck valve.

Other cylinders are okay.

Check EGT for each mag to determine any uneven timing.

Have valve train checked.

50%

Loss of EGT for one cylinder; no digital EGT

Failed probe or failed wire harness.

Swap probes to determine if probe or wire harness is bad.

Have valve lifter or rocker arm checked.

50%

Decrease in

EGT for one cylinder

Intake valve not opening fully; faulty valve lifter.


50%

50%

50%

50%

50%

Display Symptom

EGT and

CHT not uniform

Decrease in EGT for all cylinders

Slow rise in

EGT. Low

CHT

Probable

Cause

Dirty fuel injectors or fouled plugs.

Recommended

Action

Check injectors and plugs. Nonuniformity is normal for carbureted engines

Check for change in manifold pressure.

Decrease in airflow into the induction system.

Carb or induction ice.

Engine units set to Celsius

Burned exhaust valve. CHT is low due to low power output.

Set alarm limits to

Celsius degrees

Have compression checked.

High CHT on cylinders on one side of engine

EGT on one cylinder jumps up and down

100°

Obstruction under cowling.

Spark plug fouling at higher temperatures.

Check for improper installed baffling, cowl flap misalignment or bird nests.

Check spark plug.


50%

50%

50%

50%

Display no sharp peak

Symptom Probable Cause Recommended

Action

Decrease in

EGT for one cylinder at low RPM

Low compression.

Check compression.

Sudden off scale rise for any or all cylinders

Loss of peak

EGT

Pre-ignition, or

Normalize view, or failed probe

Poor ignition or vapor in fuel injection system.

Full rich and reduce power.

Change to

Percentage view.

Check probe

Have magneto tested.

Decrease in peak or flat

EGT response to leaning process

Below

10,000 ft. full throttle causes

EGTs to rise

CHT more than 500°,

EGT normal.

Adjacent

EGT may be low

Detonation.

Usually the result of 80 Octane fuel in 100 Octane engine.

Weak or defective mechanical fuel pump.

Leaking exhaust gasket blowing on CHT probe.

Enrich mixture, reduce power and relean mixture.

Repeat to find power setting where normal peak is obtained or run rich.

Apply booster pump. If EGTs drop, replace fuel pump.

Look for white powder around cylinder to determine leak area.

Alarms

The EDM-760 has programmable alarms. When a measurement falls outside of its normal limit(s), the digital display will flash with the value and abbreviation of the alarming item. If the condition triggering the alarm returns to within normal limit(s), the display will stop flashing the alarm.


If your installation includes a separate panel mounted alarm warning enunciator light or audible warning, it too will be activated.

There is no alarm for the individual EGTs because the temperature values can assume different ranges depending on the flight configuration (run up, climb, cruise). There is an alarm on the DIF measurement, the difference between the hottest and coolest EGTs. DIF—or span—is the important

measurement for monitoring the EGTs. See “Factory Set Default Limits” on page 43 for a list of the alarms and their factory default settings.

When an alarm is displayed, tapping the STEP button will temporarily disable the alarm indication for the next ten minutes.

When an alarm is displayed, holding the STEP button until the word

OFF appears will disable that alarm indication for the remainder of the

flight. See Alarm Limits” on page 43.

Alarm Priority

If multiple alarms occur simultaneously, the higher priority alarm will temporarily “hide” the lower priority alarm(s). When an alarm occurs, note the cause of the alarm and tap the STEP button to clear the alarm indication so that you will be notified of any other alarm that might have occurred. The alarm priorities are as follows:

Highest priority

Lowest priority

TIT

CHT

OIL

CLD

DIF

BAT

TIT over temperature

CHT over temperature

OIL temperature

CHT cooling rate

EGT span

Battery voltage

LO FUEL Fuel remaining low

LO TIME Fuel endurance low

Pre-Ignition and Detonation

Combustion that is too rapid leads to detonation and possibly pre-ignition.

Detonation is abnormally rapid combustion where the fuel-air mixture explodes instead of burning uniformly. It causes the EGT to decrease and the CHT to increase, and can appear during the leaning process. It occurs under high compression from fuel with too low an octane rating, or from avgas contaminated by jet fuel. Fuel additives, such as lead, boost the octane rating and slow down the combustion process, producing an even pressure to the piston.


Pre-ignition is caused by hot spots in the cylinder. Ignition occurs prior to the spark plug firing. The EDM-760 depicts pre-ignition as a sudden red line of the EGT on the analog display. This may occur in one or more cylinders. The affected cylinder column(s) will flash while the digital display will show an EGT higher than 2000°F. At this temperature pre- ignition will destroy your engines in less than a minute unless you take immediate corrective action.

Data Logging

On monthly intervals, you may choose to jot down peak EGT, measurement sequence values, and cruise engine settings on a data

logging worksheet in the back of this book. Look for trends as well as absolute values. DIF is a good indicator of the overall health of the engines. Typical values are less than 80°F for a factory new fuel injected engine, and less than 150°F for a carbureted engine. If you discover a DIF spread greater than this, identify the effected cylinder and initiate preventive maintenance.

Trend data for EGT and CHT is also of value. Any departure from a

cylinder’s baseline requires investigation. Refer to the “Engine Diagnosis

Chart” on page 24. Data logging as a means of identifying trends is of

considerable value in preventative engine maintenance.

Fuel Flow Option Operation

Select Switch

The select switch is a three-position toggle switch mounted on your instrument panel near the display of the EDM-760. Any alarm warning will appear regardless of the select switch setting.

• In the EGT (Temperature) position only the installed temperature (and battery voltage) measurements are displayed in the digital display in either the Automatic or Manual indexing modes or during the pilot programming procedure.

• In the FF (Fuel Flow) position only fuel flow measurements are displayed in the digital display in either the Automatic or

Manual indexing modes or during the pilot programming procedure.


• In the ALL (All) position, the EDM-760 both installed temperature and fuel flow measurements are displayed in the digital display in either the Automatic or Manual indexing modes or during the pilot procedure.

Start Up Fuel

After initial self-test, you will be asked to inform the EDM-760 of start up fuel. The EDM-760 will display FUEL for one second, and then flash

FILL? N until any button is pressed. If your aircraft has tank fill tabs and no auxiliary tanks, you can use the auxiliary tank feature to select either

filling to the tank tabs or topping the tank. See “Main Tank Capacity” and “Auxiliary Tanks” beginning on page 47 to program the EDM-760

for this feature. The EDM-760 does not differentiate fuel flow between the main and auxiliary tanks; it considers only total fuel in the aircraft.

During flight you may also inform the EDM-760 of startup fuel using

the pilot program mode, page 37, if you forgot to do so at start up.

auxiliary tank main tank

Auxiliary capacity

Main capacity main tank with tab tab

Refer to the column in the chart below corresponding to your fuel tank configuration. Tap the LF button to select one of the four following fueling choices on the left column of the chart.

LF to choose ⇓

FILL? N

FILL

75

GAL

Main tanks only, no tabs

Main tanks with tabs

Main & Auxiliary tanks

Did not add any fuel since last shutdown.

Topped the main tanks.

(not available)

Filled only to the tabs.



If some additional fuel is added to the auxiliary tanks, you will input this next when .0 GAL is displayed

Topped both the main and auxiliary tanks.

FILL

I20

GAL

FILL +

GAL

Did not top, but added additional fuel to the aircraft, or removed fuel from the aircraft.


Then tap the STEP button to complete the entry and advance to the

Manual indexing mode.

Adding Fuel and Auxiliary Tanks

If you either a) added less than full fuel to only the main tanks, or b) topped the main tanks but have some fuel remaining in the auxiliary tanks, then select FILL + and the next display will ask you how much you added: .0 GAL (or selected units). Hold the LF button to count up, tap the LF button to count down. The count up will stop at full tanks, since you cannot add more fuel than would top the tanks.

If you added fuel to only the main tanks, then input how much you added.

If you topped the main tanks, but have some fuel remaining in the auxiliary tanks, input how much is now in the auxiliary tanks.

You can “add” a negative amount of fuel if you remove fuel from the aircraft or wish to correct the total quantity of fuel on board.

Accumulate Total—Trip Total

You may either display total fuel used since the last time you informed the

EDM-760 that the aircraft was refueled, or for an extended trip with multiple fuel stops. This selection affects only the USD measurement. How to select whether to accumulate or reset is

described in “Pilot Programming” beginning on page 37.

Resetting “USED”

Every time you inform the EDM-760 that the aircraft is refueled, the amount of fuel used is set to zero, unless the instrument is programmed to accumulate. The display of fuel used pertains only to the fuel used since the last time you informed the EDM-760 that the aircraft was refueled.

To reset to zero the amount of fuel used at any point in time, manually step to display USD and hold both buttons for five seconds until the display shows .

0 USD.

Fuel Management

Without a means of measuring fuel flow, you must rely on the aircraft fuel gauges or total time of flight. Aircraft fuel gauges are notoriously


inaccurate (they are only required by the FAA to read accurately when displaying empty). And measuring time of flight is only an approximation, and assumes a constant fuel flow rate for each phase of flight.

The EDM-760 Fuel Flow Option uses a small turbine transducer that measures the fuel flowing into each engine. Higher fuel flow causes the transducer turbine to rotate faster which generates a faster pulse rate.

Because the transducer turbine generates thousands of pulses per gallon of fuel, it can measure with high resolution the amount of fuel that the engine has consumed. Prior to engine start you inform the EDM-760 Fuel Flow

Option of the known quantity of fuel aboard, and it will keep track of all fuel consumed.


For fuel calculations to be accurate, it is imperative that you inform the EDM-760 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

Measurement Indexing—with Fuel Flow Option

The EDM-760 steps through the engine measurements in a specific sequence. Listed below is the indexing sequence, measurement description and example of the digital display. The display will pause at each measurement for a few seconds in the Automatic indexing mode. In the

Manual indexing mode, tap the STEP button to advance to next measurement.

The first column indicates what position the select switch must be in to display that particular measurement. T is EGT, F is FF and A is ALL.

Measurement Start Up Indexing Sequence with Fuel Flow Option

Select

Switch

T, A

Measurement

Description

Voltage, System

Bus Outside Air

Temperature

Example

I4.2

8I BAT

OAT

°C

Comments

Battery voltage and OAT °F or

T, A Difference between hottest and coolest

EGT

80

EGT

52

DIF

DIF

Dot indicates most widely deviating cylinder

F, A Fuel Flow Rate Or KPH, LPH , PPH

F, A Fuel Used Each

Engine

F, A Fuel Remaining

Time to Empty

I3.5

I4.2

GPH

GPH

28.0

27.I

USD

USD

45.2

0I.38

REM

H.M

Since last refueling or trip total, each engine

In gallons, liters or pounds or kilograms. Hours . Minutes

Remaining at current fuel burn


F, A Total Fuel Used

F, A Fuel required to next GPS WPT or

Destination. Fuel

Remaining at WPT

F, A Nautical Miles per

Gal

T, A

T, A

T, A

T, A

T, A

T, A

EGT, CHT

TIT, Turbine Inlet

Temperature

Oil Temperature

TIT #2 Second

Turbine Inlet

Temperature

Carburetor

Temperature

Shock Cooling

I370

I450

TIT

TIT

I 7 7

I80

OIL

OIL

I450

I460

T I2

T I2

55

TOTL

GAL

USD

7.7

20.2

REQ

RES

6.5

357

MPG

NM

I340

I430

376

385

20

25

CRB

CRB

-30

-40

CLD

CLD

Since last refueling or trip total

(won’t reset)

Present with GPS interface, valid signal and way point

Present with GPS interface and valid signal (or MPK, MPL,

MPP)

EGT, left, CHT, right. Dot indicates cylinder

Only one of these three options may be installed in the aircraft

Dot indicates fastest cooling cylinder


Long Term Memory

The EDM-760 Long Term Memory will record and store all displayed measurements once every six seconds (or at the programmed interval of between 2 and 500 seconds). At a later time, transfer them to a Palm™ handheld as an intermediate courier, or laptop PC.

When you retrieve recorded data to your palmtop or laptop PC you can choose to retrieve all the data in stored in the EDM-760, or only the new data recorded since your last retrieval. In either case, no data in the EDM-

760 is erased. The data will be saved in the PC in a file in a compressed format.

The amount of total data that the EDM-760 can store will vary depending on how rapidly the measured temperatures change. The typical storage is

40 hours, 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 the LF and STEP 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 indexing mode. Recording begins when EGTs are greater than 500°F or

“snap” is requested.

All data are time-stamped. The EDM-760 Long Term 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-760'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 created with the new recording interval.

At power on, the EDM-760 will execute its self test and then display the date (e.g., I I. I2.99), the time (I3.26), the percentage of memory filled since the last save ( FULL 24), and the Aircraft ID.

Transferring Data from the EDM-760 to a Palm Handheld

The examples shown here are specifically for the Palm™ handheld and a PC running Windows® 98. J. P. Instruments provides an optional cable to interface to the Palm cradle cable or travel cable.


J. P. Instruments has a downloadable data transfer application program for the

Palm series called EzPalm™.

Downloading the EzPalm

Program from the Internet

Go to our web page www.jpinstruments.com

, go to the downloads page. Double click on EZPALM2.ZIP.

Transferring Data from the EDM-760 to the Palm Handheld

To transfer recorded data to your Palm Computer, proceed as follows:

1. Connect the Palm Computer cradle or travel cable option

(available from Palm Computing) to the JPI Palm Download cable (gray). Insert the small round plug of the JPI cable into the data connector on your aircraft instrument panel, and the cradle or travel cable to the Palm Computer.

2. Simultaneously hold the STEP and LF buttons for five seconds. You will see the word PROGRAM for two seconds.

Tap the STEP button until you see the question DUMP? N.

3. Tap the LF button once or twice to select either NEW or ALL.

• NEW will transfer only data newly recorded since you last saved your data.

• ALL will transfer all the data that is in the EDM memory.

In either case, no data will be erased from the EDM.

4. On the Palm Computer, tap the EzPalm icon.

JPI

EzPalm 2

5. Tap the EzCapture™ button. The Palm Computer will wait a few seconds for you.


6. On the EDM-760, tap the STEP button to begin the transfer process. The EDM-760 display shows the percentage of memory remaining to be transferred. When this number reaches zero, the transfer is complete. If you want to terminate the transfer before it is complete, simultaneously hold the STEP and LF buttons for five seconds.

7. The Palm Computer will close the file named with today’s date.

Tap Exit to end EzPalm or tap Explorer to view the file list.

Transferring Recorded Data

To transfer recorded data to your palmtop or laptop PC, proceed as follows:

1. Connect the computer to the serial port using the serial cable.

Insert the small round plug into the data connector on your aircraft instrument panel, and the other end into the computer serial port.

2.

Start running the EzPlot program in the PC, referring to the instructions supplied with that program.

3.

Simultaneously hold the STEP and LF buttons for five seconds.

You will see the word PROGRAM for two seconds. Tap the

STEP button until you see the question DUMP? NO.

4.

Tap the LF button to select either NEW or ALL.

• NEW will transfer only data newly recorded since you last saved your data.

• ALL will transfer all the data that is in the EDM-760 memory.

In either case, no data will be erased from the EDM-760.

5.

Click Start on the EzPlot screen on the PC.

6.

Tap the STEP button on the EDM to begin the transfer process.

The display shows the percentage of memory remaining to be transferred. When this number reaches zero, the transfer is complete. If you want to terminate the transfer before it is


complete, simultaneously hold the STEP and LF buttons for five seconds.

Personalizing

Pilot Programming

You can program the automatic indexing rate (1-9 seconds or 0 = don’t auto-index), the temperature display (°F or °C) and the EGT resolution (1 or 10°). To start the Pilot Programming Procedure, simultaneously hold the STEP and LF buttons for five seconds. You will see the word

PROGRAM for two seconds and then the sequence shown in the chart below. Tap the STEP button to advance to the next item in the list. Tap the LF button to select alternate values of that item. The shaded areas in the chart below pertain only to the Fuel Flow Option.

Tap STEP to advance to the next item

Tap LF to sequence through these values Comments

T, F, A

T, F, A

T, A

PROGRA

M

FUEL ?

N

RATE 4

T, A OAT

F

Stays on for two seconds.

OAT F

 OAT

C

Y—Yes—to change fuel status (see

page 29)

Indexing rate in the Automatic

Indexing Mode. Selecting 0, disables the Automatic Indexing Mode.

OAT readings in °F or °C.

Special mode: To calibrate the OAT

± 10°, hold both the STEP and LF buttons simultaneously for five seconds, which will proceed to the next step.


T, A

T, A

F, A

EGT -

I?N

29.00

= KF

LFT

OAT-I0 



EGT I?



I?Y

05.00 

99.99

This step will be normally be skipped.

See step above.

Adjust the indicated temperature up or down by up to 10°. For example,

OAT 3 adjust the OAT upward 3°.

Y—Yes—sets the digital display to one degree resolution; N—No—sets

10°. (10° is easier to see.)

Used to set and fine tune the K factor. See text below.

F, A

F, A

KF =

29.00

RT

ACCU

M?N

USD

05.00 

99.99

ACCU

M?N



ACCU

M?Y

Used to set and fine tune the K factor. See text below.

N—No—Upon informing the EDM-

760 that you refueled the aircraft, reset total fuel used to 0.

Y—Yes—accumulate total fuel used rather than reset to 0.

F, A

T, F, A

T, F, A

GPS-C

= 2

TO

GPS

DUMP?

N

MEM

END

Y

N NEW

 ALL

END



END

N



GPS Com Format.

Select to transfers ALL or only NEW data. (Next step is bypassed for a

Long Term Memory DUMP.)

Y—Yes to exit; N—No to review list again.

Using a Factory Original TIT Probe

If your aircraft is using the factory original TIT probe and gauge, you will be required to calibrate the EDM-760 for that probe. The factory original


TIT probe must be a type K and the leads must be wired red-to-red and yellow-to-yellow. Both the EDM-760 and factory original gauge may be used concurrently. Due to the high input impedance of the EDM-760 instrument, it will not affect the accuracy of the factory installed probe or gauge.

In normal cruise flight, record the difference between the factory installed

TIT gauge and the EDM-760 TIT reading.

TIT gauge ________ EDM ________.

If you haven’t already done so, start the pilot programming procedure, by simultaneously holding the STEP and LF buttons for five seconds. You will see the word PROGRAM for two seconds.

Tap STEP to advance to the next item

PROGR

AM

Tap the LF button to sequence through these values

RATE 4 RATE 4

Comments

Stays on for two seconds.

ORIG

?N

TIT

TIT

+ 0

ADJ

ORIG T-N 

ORIG T-Y

TIT - 975 TIT

+ 975

Fuel Flow Option Programming hold both STEP and LF buttons simultaneously for five seconds to begin the next sequence.

Y—Yes—selects factory original TIT probe and proceeds to the next step.

Tap the LF button to lower the correction; hold the LF button to raise the correction.

For example, if the EDM-760 reads

100 less than the aircraft’s TIT gauge, set the display to read TIT + I00.

Tap STEP button to exit the procedure.

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: reset the fuel used to 0 every time you inform the EDM-760 that the aircraft was refueled. With accumulate

ON fuel used will not be reset to 0 when you inform the EDM-760 that the aircraft was refueled.

• 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 gallon of fuel flow. Before installing the transducers, write down the K factors here

(L)_________(R)__________. To enter the number, move the decimal point three places to the left. For example if the K factor on the fuel flow transducer is 29,123, enter 29.12 in the K factor parameter.

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.

1. Make at least three flights of about two to three hours each. Note the actual fuel used (as determined by topping the tanks) and the EDM-

760 calculation of the fuel consumed for each flight = USD L and

USD R.

Flight

1

2

3



Fuel USED shown by

EDM-760

USD L USD R

Actual fuel used by topping tanks filled left filled right




Total

2. Total  the EDM-760 fuel used and  the actual fuel used for each tank.

3. Record the current K factor here  left_________ right_________ and in the table below.

4. Calculate the New K Factor as follows:

New K Factor = (  x ( Current K factor)

(actual fuel used)

New K Factor (L) = (  ) (L) )

((L) )

New K Factor (R )= ( 

( (R)

) (R)

)

)

Every time you fine tune the K factors, record the measurements here:

Date

 EDM-

760 fuel used

 actual fuel used

 Current K factor

Left Right

New K factor

= x/

Left Right

Fuel Flow Option Programming Procedure

Setting the K factor

This procedure is different than for setting other parameters. Place the select switch in the FF position. If you haven’t already done so, start the pilot programming procedure, simultaneously hold the STEP and LF buttons for five seconds. You will see the word PROGRAM for two seconds.

1. Tap STEP button to advance to the screen

LFT

29.00=KF


2. Hold both the STEP and LF buttons simultaneously for five seconds. First digit blinks:

2 9.00

3. Tap or Hold the LF button to change flashing digit:

I 9.00

4. Tap STEP button for next digit: I 9 .00

5. Tap or Hold the LF button to change flashing digit: I 8 .00

6. Tap STEP button for next digit: I8.

0 0

7. Repeat items 5 and 6 for the remaining two digits.

8. Hold STEP and LF buttons simultaneously for five seconds to store the left engine K-factor.

9. KF = 29.00 is now shown.

RT

10. Repeat steps 2 through 8 to adjust the right engine K-factor.

11. Hold STEP and LF buttons simultaneously for five seconds to exit this procedure.

Accumulate Total—Trip Total

Select “no” if you wish to display total fuel used since the last time you informed the EDM-760 that the aircraft was refueled. Select “yes” to display total fuel used for an extended trip with multiple fuel stops. This selection affects only the USD measurement.

GPS-C Comm settings

The GPS-C setting selects the format of the fuel data output of the EDM-

760. See “Setting GPS-C Fuel Flow Communications Format” on page

49.

Setting Long Term Memory Parameters

If you haven’t already done so, start the pilot programming procedure, simultaneously hold the STEP and LF buttons for five seconds. You will see the word PROGRAM for two seconds. To change the date, time and user id for the Long Term Memory, tap the STEP button until the display shows DUMP? NO. Next, simultaneously hold the STEP and LF buttons for five seconds. Then set the date and time as show below:


Tap STEP advances to next item

TIME

MNTH

DAY

YEAR

HOUR

MIN

N-----

END Y

Tap the LF button to sequence

N

I23456

Comments

Record time interval, in seconds

Month

Day

Year (note: represents 1980 through 2079)

24 hour time. We suggest you set Zulu time

This also zeros the seconds

Displays current Aircraft ID. To change Aircraft

ID, hold both STEP and LF buttons simultaneously until the first character flashes.

Use LF to select the first character. STEP moves to the next character. To Save the

Aircraft ID, Hold both STEP and LF for 5 sec.

Tap STEP button to exit the procedure.

Alarm Limits

Factory Set Default Limits

JPI conservatively sets the default alarm limits below Lycoming and

Continental recommendations.

Measuremen t

CHT

Default Low

Limit

Default High Limit

450°F 230°C

Example

OIL

TIT

CLD

DIF

BAT, 24 V

BAT, 12 V

LO FUEL

90°

F

32°C

24V

12V

45 min

230°F 110°C

1650°F 900°C

-60°F/min. -33°C/min.

500°F 280°C

32V

16V

465

CHT

280

OIL

I720

TIT

-65

CLD

525

DIF

22 .4

BAT

I7.6

BAT

00.20

H.M


LO TIME 10 gal, kg, ltr, lbs 7.2

REM

If you change the display to Celsius, be sure to change the alarm limits to

Celsius degrees. This is not done for you automatically. When an alarm is displayed, tapping the STEP button will temporarily delete that measurement from the sequence for the next ten minutes. When an alarm is displayed, holding the STEP button until the word OFF appears will delete that measurement from the sequence for the remainder of the flight.

Changing the Alarm Limits

You may prefer to set your own alarm limits Follow the procedure outlined below to change any of the factory default settings.

To start the alarm limit procedure, after power up, wait until the EDM-

760 completes its self test and is in the Automatic or Manual indexing mode. If in doubt, tap the STEP button a few times. Then follow the steps depicted here:

Hold both buttons for 5 seconds until the word

Tap STEP button until the words

Hold both buttons for 5 seconds until the words

PROGRAM END Y FAC LIM

The display will then sequence as shown in the chart below. Tap the

STEP button to advance to the next item in the list. Tap the LF button to select alternate values of that item. Hold the LF button to increase a numerical value; tap the LF button to decrease a numerical value. The shaded areas in the chart below pertain to the Fuel Flow Option only.


Changing the Alarm Limits Procedure

STEP button sequences to next item

LF button sequences through these values Description

Restore factory defaults?

REV X.XX

ENG F ENG C

EGT CHT EGT

CHT

I6.0 H BAT

OR

30.5 H

BAT

( I0.0 H BAT 35.0 H

BAT )

I2.0 L BAT

OR

24.0 L

BAT



BAT)

500 DIF ( 30

 )

450 H CHT ( 90 H CHT

 500 H )

-60 CLD ( -5 CLD 

-200 CLD )

I650 TIT ( 650 TIT 

2000 TIT )

230 H OIL ( 40 H OIL 

500 H OIL )

90 L OIL ( I0 L OIL

 250 L OIL )

TIT2 -N TIT2

-Y

FOR OIL FOR

OIL

CARB -N CARB

-Y

FOR T I T FOR

Firmware rev. number (momentary)

Select F or C degrees for all engine temps.

You must also change the alarm limits to

°F or °C.

Battery high voltage limit, set in 0.5 volt increments.

Battery low voltage limit, set in 0.5 volt increments.

EGT difference limit, set in 10° increments.

CHT high limit, set in 5° increments.

Cooling limit, set in 5°/min. increments.

Also sets the maximum scale of the EGT and TIT bar graph.

Oil temperature high limit, set in 5° increments.

Oil temperature low limit set in 5° increments

If TIT2 probes are installed in place of oil probes

If carburetor probes are installed in place of TIT probes


T I T

FUEL FLOW

IN GAL

GAL KGS LTR L

BS

MAIN=I00

TNK

Selects the units in all measurements where fuel quantity or fuel rate is displayed

Main tank capacity, in units selected.

Can also be set by HOLDING in the

STEP Button on start up will go directly to TANK SIZE.

Y—Yes—aircraft has auxiliary tanks AUX? N AUX? Y

TNK

TNK

AUX=0

TNK

Auxiliary tank capacity


MIN = 45

LOW

REM = I 0

LOW

SAVE -N 

SAVE -Y

DOT

DOT

SAVE -N 

SAVE -Y

LOP

LOP

M I N I 0



BRT

Alarm limit in minutes for low time in tanks

Alarm limit for low fuel quantity in tanks, in units selected

Y—Yes—carbureted engine

Whether excluded measurements are retained after power off.

Y—Exclusions are saved.

N—Exclusions are not saved

Whether Lean of Peak method is retained after power off.

Y—Lean of Peak is default.

N—Rich of Peak is default

Set low light display brightness from 0 to

31.

Y—Yes to exit; N—No to review list again

Fuel Flow Alarm Limits, Units, Fuel Capacity

Fuel Flow Units

Selects the units in all measurements where fuel quantity or fuel rate is displayed. If you change this parameter, it does not change the numerical value of the fuel tank capacity. You must do this manually. For example if you change from Gal. to Lbs., the tank capacity will be interpreted as

50 Lbs. rather than 50 gallons; the EDM-760 will not convert 50 Gal to equivalent pounds.

Main Tank Capacity

Enter the total capacity of the main tanks in the fuel flow units selected. If you have tank tabs (but no auxiliary tanks) and sometimes fill only to the tabs, set the main tank capacity to the capacity up to the tabs.

Auxiliary Tanks

If you do not have auxiliary tanks or tank tabs, answer “No.” If you answer “Yes,” you will be asked to input the capacity of the auxiliary


tanks in the fuel flow units selected. If you have tank tabs and sometimes fill only to the tabs, set the auxiliary tank capacity to the difference between full tank capacity and tab capacity. The EDM-760 does not differentiate fuel flow between the main and auxiliary tanks; it tracks only

total fuel in the aircraft.

Low Time Alarm Limit

Select the value of the time remaining, in minutes, that triggers the alarm.

Time remaining is calculated at the current fuel flow rate.

Low Fuel Alarm Limit

Select the value of the fuel remaining, in the selected fuel flow units, that triggers the alarm. Fuel remaining is calculated at the current fuel flow rate.

Carburetor?

Different response filters are used depending on whether your engines are carbureted or fuel injected. The filter for a carbureted engine has a slower response time to reduce sudden fluctuations in readings.

Fuel Flow Option—Formats, Diagnostics

Navigation Data Formats

Output of GPS; input to EDM-760. The EDM-760 automatically configures itself for one of three industry standard data formats:

Format Baud rate

4,800 NMEA-183

(Marine

Navigation Data

Format)

Aviation Data

Format

Northstar

(Northstar binary)

9,600

1,200

This is the format for most handheld

GPS receivers. Loran must have sentences RMA & RMB. GPS must have sentences RMB & RMC.

“Output sentence type 1” Req’d sentences: A, B, C, D, E, I and L first char id byte. Sentence terminator either <CR><LF> or <CR>.

M1 setup select “NO EXTENDED”,

“NAV ONLY”


Setting GPS-C Fuel Flow Communications Format

GPS-C

0

1

2

3

4

5

6

No fuel data output

Input to GPS; output of EDM-760

Garmin (Shadin Miniflow format)

Allied Signal (format B)

Arnav/EI fuel data

Allied Signal (format C) *

(not assigned)

UPS/Garmin fuel/air data

Diagnostic Messages, Fuel Flow

The following displays indicate a malfunction in the Fuel Flow

Option transducer or associated electrical connections:

0.0

GPH

Zero’s indicate Fuel flow is too low to register

--- GPH Dashes indicate No fuel flow transducer signals

--- H.M

Dashes indicate No fuel flow transducer signals

GPS Interface Diagnostics

Measurements REQ, RES, &

MPG are all missing from the scan.

NO - COM message and measurements REQ, RES, &

MPG are missing.

No communications from GPS receiver to EDM-760. Possibly no connection or aircraft GPS is off.

Communications are received by EDM-

760 and the Auto-Protocol setup is in process. Verify correct output format setup in GPS receiver; check GPS connections.

GPS receiver has insufficient signal for valid data.

NO - SIG message and measurements REQ, RES, &

MPG are missing.

NO - WPT message and measurements REQ & RES, are missing.

No waypoints are programmed into the aircraft GPS receiver.

- - - REQ or - - - RES message Your ground track is more than ± 70° from your course to the next GPS waypoint.


Navigation Data Ports for GPS Comm

(These ports are completely independent of the EDM-760 serial data output port.)

Navigation Data (output of GPS; input to EDM-760)

Compatible with RS-232, TTL, RS-423, RS-422 SDA.

Serial data format 8 data, 1 start, no parity. Baud rates: 1,200, 4,800, or

9,600 depending on the GPS data output format. The EDM-760 automatically detects the GPS data output format and is independent of the

GPS-C setting.

Fuel Data (input to GPS; output of EDM-760)

Serial data format 8 data, 1 start, no parity. Baud rate: 9,600.

Output format is determined by the GPS-C setting, but may be over-ridden by the GPS navigation format: If the EDM-760 senses Northstar or

NMEA-183 navigation data input, there will be no fuel data output.

Section 5 - Option Connector Pin Assignments

P3( middle) 15-pin connector

Pin no.

yel 1 yel 3 yel 5 yel 9 yel 11

Pin no.

Probe or function red 2 Left TIT red 4 Left OIL or TIT2 red 6 OAT red 10 Right TIT red 12 Right OIL or TIT2 gray 7 red 8 wht 13 blk 15

Remote alarm

+ Power

RS-232 data port

Engine ground

Interface connections to selected GPS models

EDM

Arnav 5000

Garmin 195

P4 conn Pin 1

Pin 4

(nc)

Garmin 430 / 430 Pin 57

Northstar M3P (nc)

UPS GX50 / 60 Pin 4

Fuel Flow Option 15-pin connector

Pin no.

Function

1 RS-232 out

2 RS-232 in wht 4 FF left signal red 5 FF power blk 6 FF return

7 Switch com

8 Switch EGT

9 Switch FF

11 Remote alarm

12 FF right signal

P4 conn Pin 2

Pin 5

Pin 4

Pin 56

Pin 6 (leave pin 11 open)

Pin 5


Reference Reading

You may wish to know more about the effect of engine operations on

EGT and CHT. The reading list below provides general overviews as well as original references on topics that may be of interest.

General Overview

These references are readily available to pilots and provide a readable source of general technical information.

• Teledyne Continental Motors, Engine Operation for Pilots, from the FAA Accident Prevention Program, FAA-P-8740-

13.

• Editors of Light Plane Maintenance Magazine, EGT

Systems, Belvoir Publications Inc., Greenwich, CT 06836.

1989.

• Lycoming Flyer Issue 53 dated January 93.

Technical Reviews and Original References

For those pilots who have engineering backgrounds, the references listed below present the original research on the combustion process and represent the source documents for those with technical interests.

• A. Hundere, “Autogas for Avgas,” AOPA Pilot, October,

1969.

• A. Hundere and J. Bert, “Pre-ignition and Its Deleterious

Effects in Aircraft Engines,” SAE Quarterly Transactions,

Vol. 2, No. 4, pages 547-562, October 1948.

Section 6 - Technical Support

JPI offers both e-mail and telephone technical support. Have your model and serial number ready when you call. Call JPI for a return authorization number before returning any equipment.

J.P.INSTRUMENTS

3185-B Airway Avenue

Costa Mesa, CA 92626

800 345-4574 jpinstruments.com


Limited Warranty

J.P. Instruments, Inc. (JPI), warrants all parts in your new EDM-760 to be free from defects in material and workmanship under normal use. Our obligation under this warranty is limited to repair or exchange of any defective part of this unit if the part is returned, shipping prepaid, within two years for electronics and one year for probes from the date of original purchase. Installation labor is the responsibility of the aircraft owner.

Homebuilt aircraft warranty starts when the aircraft is certified for flight.

Replacement parts carry a warranty for the balance of the warranty period.

Under this warranty, JPI is not responsible for any service charges, including removal, installation, nor any other consequential damages. JPI incurs no obligation under this warranty unless a Warranty Registration

Certificate describing the warranted product has been completed and mailed to JPI with all information requested.

This warranty is void on any product which has been subject to misuse, accident, damage caused by negligence, damage in transit, handling or modification which, in the opinion of JPI, has altered or repaired the product in any way that effects the reliability or detracts from the performance of the product, or any product whereon the serial number has been altered, defaced, effaced or destroyed.

This warranty is in lieu of all other warranties expressed or implied and other obligations of liability on JPI’s part, and it neither assumes nor authorizes any other person to assume for JPI any other liability in connection with the sale of JPI products.

To initiate this warranty, the aircraft owner must submit a completed

Data Logging Worksheet to JPI. Upon receiving a completed worksheet,

JPI will initiate the warranty from the date of original purchase. Any replacement parts carry a warranty that extends for the balance of the period of the original warranty. For homebuilt aircraft the warranty starts when the aircraft is certificated for flight and noted on the warranty card.


Index

A

Accumulate.................................38, 42

Accumulate...........................................

total..............................................30

Adding fuel.......................................30

Alarm limits..........................................

factory defaults............................43

Alarms...............................................26

resetting.......................................27

ALL...................................................38

ALL.......................................................

select switch................................29

Allied Signal.....................................49

Arnav.................................................49

Automatic indexing mode...................7

Automatic mode................................12

AUX..................................................46

Auxiliary tanks..................................47

Avgas................................................27

Aviation data format.........................48

B

Bar graph..............................................

CHT...............................................6

column resolution..........................6

EGT...............................................6

Baud rate...........................................50

Buttons..................................................

front panel.....................................8

C

CAL ERR.........................................11

Calibration........................................11

K-factor........................................40

CARB?..............................................47

Carburetor.........................................48

Celsius..................................................

display indicator............................4

Changing alarm limits.......................44

CHT......................................................

probe..............................................2

too high or too low.......................26

Combustion.............................2, 27, 51

Compression.................................2, 25 high..............................................27

low...............................................26

For Your Safe Flight

Cowling, obstruction.........................25

Cruise................................................21

Cylinder numbers................................5

D

Data.......................................................

ports, GPS....................................50

Data logging..........................................

manual.........................................28

Descent..............................................22

Detonation.........................................26

Diagnosing engine problems.............23

Diagnostic.............................................

fuel flow messages......................49

self test........................................11

DIF..................................10, 28, 32, 45

Dimming, display................................7

Display................................................4

analog............................................4

digital............................................6

Display brightness.............................47

Dot index.............................................5

DUMP?.......................................35, 36

E

Economy, best.....................................3

EGT.......................................................

alarms..........................................27

loss...............................................24

resolution, display.......................38

select switch................................28

too high........................................24

too low.........................................25

Electronics International...................49

Engine...................................................

diagnosis chart.............................24

run-up..........................................20

Enunciator, alarm..............................27

EzCapture™......................................35

F

Fahrenheit.............................................

display indicator............................4

Failure to pre-lean.............................22

FF, select switch ..............................28

Fill options........................................29

FILL? N.............................................29

Page 53

Flashing display..............15, 20, 26, 28

Flat EGT response............................26

Fuel.......................................................

injectors.......................................19

injectors, clogged...............2, 21, 25

Octane..........................................26

pump............................................26

tank capacity..........................29, 47

Fuel flow...............................................

alarm limits.................................47

units.............................................47

G

GAMI....................................13, 18, 19

Garmin..............................................49

Gasket probe.....................................23

Gasket, manifold...............................26

GPH..................................................32

GPS.......................................................

comm settings..............................42

constant........................................38

interface diagnostics....................49

H

I

H.S....................................................32

Hastaloy............................................20

HBAT................................................45

HCHT................................................45

HOIL.................................................45

Holding a button.................................8

Ice, carburetor or induction...............25

Ignition..............................................26

Ignition..................................................

timing..........................................24

Include measurements.......................12

Indexing................................................

sequence......................................32

Induction...........................................25

Intake valve.......................................24

K

K-factor.................................................

changing................................38, 41 determing.....................................40

L

Leak......................................................

manifold.......................................26

Page 54

Lean of Peak......................................18

Lean of Peak Leaning........................18

Leanest cylinder................................15

LeanFind...............................................

button.............................................9

description.....................................8

mode............................................13

procedure.....................................15

Leaning...........................................1, 2 pre-leaning...................................16

too quickly...................................22

Long Term Memory Option..................

operation......................................34

Low fuel alarm..................................48

M

Magneto check..................................20

MAIN................................................46

Manual indexing mode.......................7

Manual mode....................................12

Mark..................................................34

Measurement indexing................10, 32

Miles per gallon................................33

Misapplications.................................22

Missing.................................................

bar6

Mixture.........................................2, 19

Modes...........................................7, 11

N

Navigation data formats....................48

NEW...........................................35, 36

NMEA-183........................................48

NO COM...........................................49

NO SIG.............................................49

NO WPT...........................................49

Normal engine limits........................23

Normalize view...................................5

Northstar binary format.....................48

O

OAT......................................................

calibration....................................38

F or C...........................................37

OFF.........................................8, 27, 44

Off-scale EGT bars...........................22

OIL..............................................10, 33

OPEN PRB........................................11

Operation..............................................

fuel flow option...........................28

Engine Data Management

temperature scanner......................4

Option connector...............................50

Outside air temperature..............10, 32

P

Peak EGT..........................................16

PEAK EGT.................................15, 17

Percentage view..................................5

Personalizing.....................................37

Pilot programming............................37

alarm limits.................................43

data recording..............................42

fuel flow option...........................39

Power, best..........................................3

Pre-ignition.................................26, 27

Priority, alarm...................................27

R

Rate.......................................................

fuel flow......................................31

indexing.......................................39

Real-time...........................................47

RECRD?............................................47

Reference reading.............................51

REM..................................................33

REQ..................................................33

Reset.....................................................

fuel used......................................30

Rich of Peak......................................13

RS-232..............................................50

S

Save DOT..........................................47

Save LOP..........................................47

Select switch.....................................28

Self-test.............................................11

Setup.....................................................

Long Term Memory Option.........42

Shadin Miniflow...............................49

Shock cooling............11, 12, 22, 23, 33

Spark plug.............................................

fouling.........................6, 20, 24, 25

Specifications......................................2

Startup...................................................

diagnostics...................................11

fuel...............................................29

STEP button........................................8

T

Take-off.............................................21

For Your Safe Flight

Tanks, fuel............................................

tabs..............................................29

Tapping a button.................................8

Technical support..............................51

Time set............................................43

TIT..............................................10, 33 factory original probe...................38

Toggle, N, P........................................5

Transducer, fuel flow........................31

Transferring recorded data..........35, 36

Turbocharged Engines.......................19

U

Uniform, CHT, EGT not...................25

USD............................................32, 33

V

Valve.....................................................

stuck............................................24

Vapor................................................26

View......................................................

change diagram..............................9

Voltage........................................10, 32

W

Warranty...........................................52

Page 55

EDM-760 Pilots Guide

EDM-760 Quick Reference Guide

Pilot’s Guide

PROGRAM END Y FAC LIM

Related manuals

J.P. Instruments

EDM-700

J.P. Instruments

EDM 700/800/711

JPI

FS-450

J.P. Instruments

EDM-830

J.P. Instruments

Fuel Scan 450

J.P. Instruments

EDM 930 Primary

J.P. Instruments

EDM 350