Trimble TERRA AT 3000 Operation & Installation Manual
AT 3000
ALTITUDE ENCODER
OPERATION/INSTALLATION MANUAL
Trimble
2105 Donley
Austin, Texas 78758
(512) 432-0400
PRINTED IN U.S.A.
PUBLICATION NUMBER 1900-4099-00
AT 3000
ALTITUDE ENCODER
OPERATION/INSTALLATION MANUAL
Trimble
2105 Donley
Austin, Texas 78758
(512) 432-0400
PRINTED IN U.S.A.
PUBLICATION NUMBER 1900-4099-00
REVISION F
OCTOBER 7, 1996
Title Page
T-1
AT 3000 ALTITUDE ENCODER
TERRA BY TRIMBLE
AT 3000 ALTITUDE ENCODER
Table of Contents
SECTION I ......................................................................................................................... 1
1. INTRODUCTION.................................................................................... 1
1.1 SCOPE ........................................................................................ 1
1.2 DESCRIPTION ........................................................................... 1
1.3 SPECIFICATION ....................................................................... 1
SECTION II........................................................................................................................ 3
2. INSTALLATION, CALIBRATION AND TEST.................................... 3
2.1 GENERAL .................................................................................. 3
2.2 PREPARATION FOR USE ........................................................ 3
2.3 GENERAL INSTALLATION INSTRUCTIONS
FOR AVIONICS ......................................................................... 3
2.4 MECHANICAL INSTALLATION ............................................ 6
2.5 ELECTRICAL INSTALLATION .............................................. 6
2.6 CALIBRATION.......................................................................... 7
2.7 DATA CORRESPONDENCE TEST ......................................... 8
2.8 PLACARDING ........................................................................... 8
2.9 TEST POINTS ............................................................................ 9
2.10 OUTLINE DRAWING ............................................................. 10
2.11 WIRING DIAGRAM ................................................................ 11
SECTION III .................................................................................................................... 13
3. OPERATION (MOD STATUS 4 AND BELOW) ................................ 13
3A. OPERATION (MOD STATUS 5 AND ABOVE .................................. 13
SECTION IV .................................................................................................................... 15
4. WARRANTY................................................................................................ 15
4.1 LIMITED WARRANTY
OF TERRA BY TRIMBLE PRODUCTS................................. 15
Revision F
October 7, 1996 TC-1
1. INTRODUCTION
1.1 SCOPE
This manual provides installation and operating instructions for the Terra by Trimble AT
3000 Altitude Encoder manufactured by Trimble, Austin, Texas.
1.2 DESCRIPTION
The AT 3000 Altitude Encoder interfaces with most ATC transponders and is connected to
the aircraft pneumatic static system. The encoder converts altitude (pressure) to digital data
for transmission by the aircraft’s transponder. The transponder, when interrogated by the
ground station will reply with aircraft altitude in the digital code set forth in the International
Standard Code for SSR Pressure Altitude Transmission.
The altitude encoder is 7.25 inches long x 2.6 inches wide x 1.62 inches high. The weight is
0.5 pounds.
Interconnection to the ATC transponder is made with a 15 pin “D” type connector.
SECTION I
1.3 SPECIFICATIONS
ALTITUDE RANGE: -1000 FT. TO 30,000 FT.
SUPPLY VOLTAGE: 13.75 VDC OR 27.5 VDC
CURRENT: 180 MA @ 13.75 VDC
WARM-UP TIME: 10 MINUTES
TEMPERATURE: -20 DEG. C TO +70 DEG. C
WEIGHT: 0.5 LBS.
TSO C88
DO-160A ENV. CAT. CIA/JKLMNOP/xxxxxxABBBA
150 MA @ 27.5 VDC
Revision F
October 7, 1996
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Revision F
October 7, 1996
SECTION II
2. INSTALLATION, CALIBRATION AND TEST
2.1 GENERAL
This section contains all necessary installation instructions and check-out procedures for the
Terra by Trimble AT3000 Altitude Encoder. For the installer with little or no experience of
installing avionics, Section 2.3 provides important information. Trimble recommends
reading this section before continuing with the installation.
2.2 PREPARATION FOR USE
Every precaution has been taken to protect the AT3000 during shipment. Upon receipt of the
equipment, remove the unit form the shipping container and visually inspect for damage.
If the unit is damaged, a claim must be filed with the carrier. The carrier assumes title of the
unit when accepted for shipment. Do NOT return the unit to Trimble or its representatives.
It is suggested that the package be retained for inspection by the carrier in the case of damage
or for future use should it be necessary to ship the unit for service or to transfer if to another
location.
2.3 GENERAL INSTALLATION INSTRUCTIONS FOR AVIONICS
The following paragraphs contain pertinent hints, advice, and guidance intended for use by
installers of avionics equipment. These have been drafted to address common problems
encountered during the installation process. Specific questions may be addressed to Trimble
for technical assistance by calling 1-800-487-4662 and requesting Technical Assistance.
2.3.1 COAXIAL CABLES AND CONNECTORS
Improper installation of cables and connectors create many of the problems
encountered during avionics installations. Problems to avoid include twisted, chafed,
or pinched cables, sharp bends in cables, open or shorted conductors or improper
grounding. After installing connectors, pull firmly to ensure good mechanical
bonding (particularly if you use crimp-on connectors) and use your ohmmeter to
insure good electrical connection with no shorting.
Revision F
October 7, 1996
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