barfield DALT55 Owner's manual

DALT55 Digital Altimeter Instrument
INSTRUCTION SUPPLEMENT
BARFIELD M/N DALT55
Doc. P/N: 61-101-02184_02186
Revision B
January 10, 2013
____________________________________
BARFIELD, INC.
Manual applicable for DALT55 P/Ns:
101-02184
101-02186
DALT55 is Designed to be used with Barfield
Pitot-Static Test Sets (1811 Series) and other
Ground Support Test Equipment.
Not for aircraft installation.
Corporate Headquarters
4101 Northwest 29thStreet
Miami, Florida 33142
www.barfieldinc.com
Email: [e-mail]
Barfield Inc. Confidential and Proprietary Information.
This document and all the information contained herein is the sole property of Barfield Inc.
No intellectual property rights are granted by the delivery of this document or the disclosure of its content.
This entire document is proprietary information and shall not be reproduced or disclosed to a third party without
the express written consent of Barfield Inc.
This document and its content shall not be used for any purpose other than that for which it is supplied.
To buy, sell, rent or trade-in this product please click on the link below:
http://www.avionteq.com/Barfield-DALT55-Digital-Altimeter-Instrument-PN-101-02184.aspx
www.avionteq.com

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CONTACT INFORMATION
Users are requested to notify the manufacturer of any discrepancy, omission, or error found in
this manual. Inquiries should include specific questions and reference the publication title,
number, chapter, page, figure, paragraph, and effective date.
Please send comments to:
TECHNICAL CUSTOMER SUPPORT - GSTE
BARFIELD, INC.
P.O. BOX 025367
MIAMI, FL 33102-5367
USA
Telephone [phone]
[phone]
Fax [phone]
Email [email protected]

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REVISION RECORD
REV. ECO # REV. DATE DESCRIPTION OF CHANGE
A - May/20/11
First Issue. New Manual to be use for
both part numbers 101-02184 & 101-
02186.
For P/N 101-02184 this document
revision supersedes document number
61-101-02184-RevE
B 260-00950 Jan/10/13 Revision to update battery part number.

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LIST OF APPROVED REPAIR FACILITIES
The manufacturer of this equipment does not recommend the user to attempt any maintenance
or repair. In case of malfunction, contact the manufacturer, to obtain the list of approved repai
r
facilities worldwide, ensuring that this equipment will be serviced using proper procedures and
certified instruments. A Return Maintenance Authorization (RMA) number will be assigned
during this call, to keep track of the shipment and the service.
BARFIELD PRODUCT SUPPORT DIVISION
Telephone: [phone] Shipping Address:
[phone]
Barfield,Inc.
Fax: [phone] NW 29th Street
Miami, Florida 33142
Email: [e-mail] USA
Mailing Address:
Barfield,Inc.
P.O. Box 025367
Miami, FL 33102-536
7
USA
RECERTIFICATION
Barfield Digital Airspeed Instruments, P/Ns 101-02184 and 101-02186, have a one-year
recertification requirement. Qualified technicians in a shop equipped with the necessary
tooling, facilities, and Barfield-approved procedures must perform the maintenance
required by these units.

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LIST OF ACRONYMS / TERMS USED
CCW..................................................................Counterclockwise
CW....................................................................Clockwise
EEPROM...........................................................Electrically Erasable Programmable
Read-Only Memory
EPR...................................................................Engine Pressure Ratio
FS......................................................................Full Scale
Ft.......................................................................Feet
F/W....................................................................Firmware
InHg...................................................................Inches of mercury
Km/hr.................................................................Kilometers per hour
Kts.....................................................................Knots
LCD...................................................................Liquid Crystal Display
Mb.....................................................................Millibar
Mb abs ..............................................................Millibar absolute
MPH..................................................................Miles per hour
P/N....................................................................Part Number
Ps......................................................................Static Pressure
PSI ....................................................................Pounds per Square Inch
PSID..................................................................Pounds per Square Inch Differential
Pt.......................................................................Pitot Pressure
S/N....................................................................Serial Number

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TABLE OF CONTENTS
Contact Information
Revision Record
List of Approved Repair Facilities
Limited One Year Warranty
List of Acronyms / Terms Used
Table of Contents
1. GENERAL INFORMATION
1.1 Purpose ..................................................................................... 1
1.2 Description ..................................................................................... 1
1.3 Features ..................................................................................... 1
2. DIGITAL ALTIMETER SPECIFICATIONS (P/N 101-02184 and 101-02186)........... 2
3. INSPECTION ..................................................................................... 5
4. INSTRUMENT DESCRIPTION..................................................................... 5
4.1 General ..................................................................................... 5
4.2 Function Keys ..................................................................................... 5
4.3 Soft Keys ..................................................................................... 5
5. OPERATION
5.1 Powering On (Initialization).................................................................... 7
5.2 Start-Up Procedure................................................................................ 8
5.3 Main Menu ..................................................................................... 8
- Units ..................................................................................... 8
- Display ..................................................................................... 9
- EPR Test ..................................................................................... 9
- Maintenance ..................................................................................... 9
- Level 1 Submenu............................................................................... 9
- Level 2 Submenu............................................................................... 10
6. STATIC LEAK TEST.................................................................................... 12
6.1 Pitot Pretest ..................................................................................... 12
6.2 Static Leak Test..................................................................................... 14
6.3 EPR Test ..................................................................................... 14
APPENDIX. Installation Instructions for Instruments and Batteries

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1. GENERAL INFORMATION
1.1 Purpose
Electronic pressure sensors are far more stable, damage-resistant and
more widely available than analog instruments. The DALT55 is designed
as a digital, retrofit replacement for the current analog altimeter instrument
found in the 1811 Pitot-Static Test Set series and equivalent testers. The
fit, form and size of the DALT55 allows for easy installation into the test set.
1.2 Description
Data on the DALT55 shows on a graphic liquid crystal display (LCD). The
display is backlit with an auto-shutdown timer for battery life protection. A
battery pack supplies the power for the instrument. A keypad is used for
access to, and movement through, the menu functions shown on the
display. Additional keys on the keypad allow adjustment of the display
contrast. The icons also serve as an indication of the battery power level
and show the two-instrument state.
1.3 Features
The DALT55 calculates and displays such aeronautical data as altitude,
vertical speed, differential or Pitot* pressure, and engine pressure ratio*
(EPR). It may perform an automatic static leak test or a calibration
procedure.
NOTE: * Feature is available when DALT55 and DAS650 are connected as
part of instrument configuration.
Units of measurements for the DALT55 are user-determined and
selectable. Units for aeronautical data can be expressed in feet, feet per
minute (English), in meters and meters/minute. Units for static pressure
data are available in inHg abs, mb abs or psia. The user may also choose
between the Aeronautical or Pressure display.
The DALT55 allows the user to retrieve maintenance information such as
instrument serial number (S/N), manufacturer part number (P/N),
configuration of single or dual instruments, time, date and password setting
and enabling automatic power off.

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2. DIGITAL ALTIMETER SPECIFICATIONS – (P/N 101-02184)
The DALT55 specifications meet the requirements described in Federal Aviation
Regulation Part 43 Appendix-E, which defines the requirements for accuracy of an
aircraft’s altimeter and as such is reference for the accuracy of Pitot-Static testers.
Note: Do not use these specifications to certify the accuracy of RVSM
qualified aircraft instruments.
DALT55 (P/N 101-02184)
RANGE -1500 to 55,000 ft
ACCURACY 0.025% Typical FS over complete operating temperature range.
Specific accuracies at certain altitudes are:
Altitude Altitude
-1,500 Ft ± 7 Ft 30,000 Ft ± 20 Ft
0 Ft ± 7 Ft 40,000 Ft ± 30 Ft
10,000 Ft ± 10 Ft 50,000 Ft ± 48 Ft
20,000 Ft ± 14 Ft 55,000 Ft ± 62 Ft
Note: When displaying altitude in Ft: Feet or M: Meters, the pressure
altitude calculation is based on a baro set of 29.921 inHg = 1013.2 mb.
Note: The Baro Set value cannot be changed, it is set at 29.921 inHg.
STABILITY
0.05% FS (Typical) over 12 months.
Note: This tolerance represents the typical stability over a 12 month
period. If tighter tolerances are required, the calibration interval should be
reduced or establish proof of stability.
PRESSURE RANGE 3.425 inHg to 32 inHg absolute
ROC VSI (Vertical Speed Displayed)
± 50 Ft/min (VSI > 150 Ft/min)
± 10 M/Min (VSI > 40 M/min)
Note: Displays “0” below 100 Ft/min & 30 M/min
LEAK TEST MODE Measures Leak Rate
After 1 minute of stabilization and the minimum of 1 minute Leak
Test Interval, the Leak Test accuracy:
± 3 Ft/min
± 1 M/min
TEMPERATURE RANGE: OPERATING: -10º C to 50º C (-4° F to 122° F)
STORAGE: -30º C to 60º C (-22° F to 140° F)

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DIGITAL ALTIMETER SPECIFICATIONS – (P/N 101-02186)
The DALT55 specifications meet the requirements described in Federal Aviation
Regulation Part 43 Appendix-E, which defines the requirements for accuracy of an
aircraft’s altimeter and as such is reference for the accuracy of Pitot-Static testers.
Note: Do not use these specifications to certify the accuracy of RVSM
qualified aircraft instruments.
DALT55 (P/N 101-02186)
ALTITUDE RANGE -1,500 to 55,000 ft
ACCURACY 0.020% FS Typical, 0.040% FS (Max) over complete operating
temperature range. Specific accuracies at certain altitudes are:
Altitude Altitude
-1,500 Ft ± 7 Ft 30,000 Ft ± 20 Ft
0 Ft ± 7 Ft 40,000 Ft ± 30 Ft
10,000 Ft ± 10 Ft 50,000 Ft ± 48 Ft
20,000 Ft ± 14 Ft 55,000 Ft ± 62 Ft
Note: When displaying altitude in Ft: Feet or M: Meters, the pressure
altitude calculation is based on a baro set of 29.921 inHg = 1013.2 mb.
Note: The Baro Set value cannot be changed, it is set at 29.921 inHg.
STABILITY
0.025% FS (Max) over 12 months.
Note: This tolerance represents the stability over a 12 month period. If
tighter tolerances are required, the calibration interval should be reduced
or establish proof of stability.
PRESSURE RANGE 3.425 inHg to 38 inHg absolute
ROC VSI (Vertical Speed Displayed)
± 50 Ft/min (VSI > 150 Ft/min)
± 10 M/Min (VSI > 40 M/min)
Note: Displays “0” below 100 Ft/min & 30 M/min
LEAK TEST MODE Measures Leak Rate
A
fter 1 minute of stabilization and the minimum of 1 minute Leak
Test Interval, the Leak Test accuracy:
± 3 Ft/min
± 1 M/min
TEMPERATURE RANGE: OPERATING: -10º C to 50º C (-4° F to 122° F)
STORAGE: -30º C to 60º C (-22° F to 140° F)

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POWER: DALT55 / DAS650
Operating Voltage:
Current Consumption
Battery Life:
With Rechargeable BP4000
NiMH, P/N 137-00009
With Rechargeable BP4015
NiMH, P/N 137-00030
4.0 to 5.5 VDC
100mA to 200mA (Depends on input voltage and the
backlight ON/OFF)
30 Hrs, single instrument
15 Hrs, Two instrument configuration (DALT55 & DAS650)
30 Hrs, single instrument
15 Hrs, Two instrument configuration (DALT55 & DAS650)
Note:
BP4000 & BP4015 have same capacity, 4.8V / 4,000 mAh
Accessories for the DALT55 / DAS650 Instruments
Retrofit Kit (Order as PN: 102-02111) Kit, Generic Rechargeable NiMH Battery Pack. Use for retrofit old analog instrument units with
digital instruments
BP4015 (Order as PN: 137-00030)
Rechargeable NiMH 4.8 VDC @ 4,000 mAh.
Compatible with SC3000 charger & ECP1200
embedded charger/power supply.
Note: BP4015 replaces BP4010 and BP4000,
same capacity. Refer to SIL 88-102-02111.
SC3000 (Order as PN: 137-00021) Smart charger, fully charges a depleted BP4015 in less than 2 hrs. Not compatible with
BP4000. Universal input (100-240 V, 50-60 Hz)

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3. INSPECTION
All test sets must be recalibrated in precise time periods for their readings to
remain valid.
The DALT55 has a one-year recalibration period, for more details see the note in
the Stability specification (page 2). During the last 30 days before the expiration
of this period, a message displays at the end of the initialization sequence to
remind the user that the instrument must be sent for recalibration to a Barfield Inc.
approved facility.
4. INSTRUMENT DESCRIPTION
4.1 General
The DALT55 is equipped with an easy-to-use menu-driven LCD display
(Figure 1) that assists the technician during setup and testing. Each menu
gives a set of user options that are selected using cursor (arrow) keys.
4.2 Function Keys
The four (4) function keys have a fixed purpose at all times. These keys
are the power ON/OFF, “+” contrast display increase, “-“ contrast display
decrease, and the display backlight ON/OFF.
4.3 Soft Keys
The three (3) “soft-keys” are programmable and multi-functional. The
function of these keys depends on the software programming of the
particular key. Each key has various functions depending on the displayed
menu.

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FUNCTION KEYS
Key (s) Location Function
ON/OFF Top, right of display Powers on instrument
Backlight Right of display Illuminates display
“+” and “-“ Left of display Contrast adjustment
Soft (multi-functional) Bottom of display Access menus and control
instrument
ON/OFF
switch
Backlight
switch
Contrast
ad
j
ustment
Soft Keys
FIGURE 1 FUNCTION AND SOFT KEYS
LEAK
D A L T 5 5
1,000
ft
MENU
250
ft / min
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BARFIELD
DALT 55
101-02184
Calibrated
Face UP
BARFIELD
DALT 55
101-02186
Calibrated
Face UP
FIGURE 2 POWER ON IDENTIFICATION

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5. OPERATION
5.1 Powering On (Initialization)
After pressing the ON/OFF switch, the unit will display the initialization
screen with company name and equipment description. A second screen
will display the part number and calibration orientation (Figure 2). The unit
will then display a message indicating if the power automatic off feature is
disabled or enabled (if the auto-off is enabled, the instrument also shows
the amount of time until the unit shuts off). (Note: The manufacturer’s
default setting is disabled.) The instrument then begins a series of initial
value calculations for altitude and, if applicable, establishes the link
between two instruments. Also, the date of last calibration is read.* If no
errors are detected during power up, the instrument enters normal mode
and the Aeronautical display appears.
NOTE: There is a delay of several seconds before start-up sequence
appears and the unit initializes. For two-instrument operations, turn
on DALT55 at the same time as DAS650. (A message appears
showing the link is successful. If DAS650 is not on, the instrument
displays a message that reminds the user to do so.)
* If the current date is within 30 days of the one-year anniversary of the last
calibration date, a message tells the user when the next annual
recalibration is due. However, if the current date is after the annual
recalibration due date, the message tells the user “recalibration period
exceeded”.
FIGURE 3 AERONAUTICAL DISPLAY
Displays simulated pressure
altitude in relation to 29.921 inHg
barometric pressure at sea level
Serial link indicator. Shows unit is
ready for two-instrument operation.
Flashes when link is lost
Displays vertical speed
Battery or “AC” indicator.
Flashes when battery level is
too low for safe operation.
D A L T 5 5
1,000
250
LEAK MENU
ft / min
ft

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5.2 Start-up Procedure
a. Press ON/OFF switch to turn on instrument.
b. When initialization finishes, the Aeronautical display appears and
shows the altitude and vertical speed.
5.3 Main Menu
Several menus allow user to access the various functions of the instrument.
Primary functions of the tester are available by scrolling (using arrow keys)
to the desired selection. Selecting EXIT returns the user to the previously
displayed screen. (Refer to Chart 1, Main Menu)
a. From the Aeronautical display, open the main menu by pressing
MENU key (located at bottom of display). Press the SEL key to
accept selection.
* accessible only in two-instrument configuration.
CHART 1 MAIN MENU
b. Main menu options include: Units, Display, EPR Test, Maintenance,
and Exit.
1) UNITS
The DALT55 may be changed and configured to display several
units of measurement.
After selecting AERONAUTICAL, press CHANGE (located
bottom left corner on display). Use the arrow keys to select ft &
ft/min or m & m/min (metric) as desired. Press SAVE to store.
After selecting PRESSURE, press CHANGE. Use the arrow
keys to select inHg abs, mbar abs or psia units settings. Press
SAVE to store.
MAINTENANCE MENU
Level 1
Level 2 (password protected)
UNITS DISPLAY EPR TEST * MAINTENANCE
AERONAUTICAL
PRESSURE
MENU
EXIT
AERONAUTICAL
PRESSURE

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2) DISPLAY
The DISPLAY option in the main menu allows selection of two types of
active display:
Aeronautical display shows simulated altitude and vertical speed.
Pressure display shows static (Ps) pressure.
3) EPR TEST (Engine Pressure Ratio)
Note: EPR is only available if DAS650 and DALT55 are connected.
Using the Maintenance menu in Level 1, both instruments must
also be configured for the two-instrument configuration.
Selecting EPR allows user to view instrument’s calculated Pt, Ps and
EPR readings.
4) MAINTENANCE
Two submenus are available for maintenance functions such as
calibration, configuring unit for two-instrument link and enabling and
setting the automatic power off timer.
LEVEL 1submenu contains tester general information (See Chart 2).
CHART 2 LEVEL 1 SUBMENU
(a) Transducer
Device ID: displays the transducer’s manufacturer, P/N, S/N
and range.
Coefficients: displays the four (K00-K03) temperature com-
pensation coefficients stored in the transducer’s EEPROM.
(b) Model, S/N
Displays tester’s range, firmware version, build, S/N.
LEVEL 1
Build, S/N, F/W Level Pressure Slope
Calibration Date Stand-alone 2-instruments
TRANSDUCER MODEL, S/N CONFIG
MFG, P/N,
S/N, Range EEPROM
Coefficients
DEVICE ID COEFFICIENT
CAL. COEFF.

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(c) Cal Coeffs.
Displays linearization coefficients:
Offset pressure (inHg)
Slope linearization
Date last calibration was performed
(d) Config.
This option allows user to configure instrument, selecting:
Stand-alone: DALT55 is not communicating with DAS650.
Two-instrument: DALT55 is communicating with DAS650.
Note: In the two-instrument configuration, the serial link
indicator shows at bottom of Aeronautical, Pressure,
Leak Test and EPR Test displays. The indicator flashes
when link is not functional.
Press CHANGE; then SAVE to change configuration.
Level 2 maintenance submenu is password-protected. User
accesses calibration procedure, sets date/time and changes
password and enables automatic power off.
NOTE: The initial default password is “111”.
CHART 3 LEVEL 2 MAINTENANCE SUBMENU
(a) Calibration
User may perform calibration and change the units system for
calibration by pressing the UNITS key. Continue pressing
UNITS key to “scroll” to m (meters), inHg, mbar, Psi, or ft
screens. Press ENTER to store.
LEVEL 2
CALIBRATION
PASSWORD
PASSWORD
DATE / TIME
DATE TIME Enter new password
Confirm new password
AUTO OFF

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(b) Date / Time
To set date or time, use the up / down arrow keys to increase /
decrease selection.)
CHANGE (Set) DATE as MM / DD / YY
CHANGE (Set) TIME as hr / min.
(c) Password
To change the password:
Enter new password (###).
Re-enter new password to confirm.
NOTE: Once the user is in the password screen, the unit will
not allow exiting from the screen until a password is
entered and saved.
(d) Auto-Off
The feature factory setting is “disabled”. To change the setting,
use the up / down arrows to select AUTO-OFF. Press
CHANGE key. Press MENU to save.
When auto-off is enabled and there are 60 seconds left before
the unit shuts off, the display shows a “countdown” screen.
Pressing the keys below the arrows restarts the 30-minute
timer and the countdown screen disappears.
FIGURE 3 AUTO OFF COUNTDOWN DISPLAY
NOTE: Pressing any key at any time during the unit’s
operation will also reset the “clock” to another 30-
minute time period.
D A L T 5 5
A
UTO - OFF
59
TIME REMAINING:
Press Soft Key
To Reset Time
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6. STATIC LEAK TEST
NOTE: Press CANCEL to exit leak test at any time during procedure and to
return to Aeronautical display.
6.1 STATIC PRETEST
NOTE: For more specific information regarding the control valves and
ports, refer to the Test Set Operations Manual.
To verify the Leak Rate of the test set and hoses do the following:
a. Connect the static hose to the static port of the test set.
b. Ensure the aircraft end of the hose is capped (sealed).
c. Close the STATIC and PITOT vent valves.
d. Open the CROSSBLEED control valve.
e. Slowly open the STATIC control valve to create an altitude of
approximately 20,000 ft.
f. When the desired altitude is reached, close the STATIC control valve.
g. To go to the Leak Test display, press the LEAK key on the
Aeronautical display. The Leak Test display appears. To change the
duration of the Leak Test, press the ADJ key and using the keys below
the arrows, increase (or decrease) the time from 1 to 30 minutes.
CAUTION: Do not press START until ready to do Leak Test. When
the key is pressed, a display immediately appears with a
60-second countdown timer allowing time for stabilization
of the static pressure. The actual leak test measurement
begins when the timer completes the 60-second
stabilization.
FIGURE 4 LEAK TEST TIMER DISPLAYS
LEAK TEST
-153 f t
A
LT:
T i m e r : 1 M i n u t e
LEAK TEST
-152 f t
A
LT:
T i m e r : 1 M i n u t e
START
ADJ. CANCELSTART
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