Vishay Tedea Huntleigh JETWEIGH W N, JETWEIGH W M User Manual
Important Notices:
(1). This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following
measures:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
-Consult the dealer or an experienced radio/TV technician for help.
(2). Changes or modifications to this equipment not expressly approved by the
party responsible for compliance (Vishay Israel Ltd.) could void the user’s
authority to operate the equipment.
(3). The antenna used for the load cell transmitter must be installed to normally
provide minimum separation distance of at least 20 cm from all persons and must
not be co-located or operating in conjunction with any other antenna or
transmitter.
The handheld terminal is portable but restricted to occupational/controlled use
only. It is not authorized for consumer or general population use. Personnel using
the terminal must be trained regarding RF exposure and its control.
Vishay makes no representation or warranties of any kind whatsoever with respect to the contents
hereof and specifically disclaims any implied warranties or merchantability or fitness for any
particular purpose. Vishay shall not be held liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance, or use of this publication or
its contents. Vishay reserves the right to revise this manual at any time and to make changes in the
contents hereof without obligation to notify any person of such revision or changes.
Cover photo courtesy of the USAF
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Table of Contents
Section I - General Information
1.1 INTRODUCTION .................................................................................................................... 1-1
1.2 SYSTEM COMPONENT DESCRIPTIONS ............................................................................. 1-2
1.2.1 Wireless Handheld Terminal .......................................................................................................................... 1-2
1.2.2 Wireless Load Cells ......................................................................................................................................... 1-2
1.2.3 Load Cell Adapters .......................................................................................................................................... 1-2
1.2.4 Thermal Printer ................................................................................................................................................ 1-2
Section II - Pre-Operation
2.1 PRE-OPERATIONAL PROCEDURES.................................................................................... 2-1
2.1.1 Load Cell Jack Point Configuration ................................................................................................................ 2-1
2.1.2 Preparation for Aircraft Weighing .................................................................................................................. 2-1
2.2 TERMINAL SETUP ................................................................................................................ 2-2
2.2.1 Setup Screen Options ..................................................................................................................................... 2-2
2.2.2 Main .................................................................................................................................................................. 2-2
2.2.3 Gravity Factor Compensation ......................................................................................................................... 2-3
2.2.4 A/C .................................................................................................................................................................... 2-3
2.2.5 Channel ............................................................................................................................................................ 2-4
2.2.6 Changing Channel ID and Location ................................................................................................................ 2-4
Section III - Operation
3.1 LOAD CELL POWER UP ....................................................................................................... 3-1
3.2 TERMINAL POWER UP ......................................................................................................... 3-1
3.3 AIRCRAFT WEIGHING CYCLE ............................................................................................. 3-1
3.3.1 Zeroing ............................................................................................................................................................. 3-1
3.3.2 Lifting ................................................................................................................................................................ 3-3
3.3.4 Removing ......................................................................................................................................................... 3-5
3.3.5 Rezeroing ......................................................................................................................................................... 3-5
3.3.6 Weighment Report .......................................................................................................................................... 3-5
Section IV - Weighing History
4.1 RECALL A RECORD FROM THE HISTORY FILE................................................................. 4-1
4.2 RECALLING AIRCRAFT FROM THE LIBRARY .................................................................... 4-1
4.3 AIRCRAFT NOT RECORDED IN THE LIBRARY ................................................................... 4-1
Section V - Troubleshooting
5.1 TROUBLESHOOTING OVERVIEW ....................................................................................... 5-1
5.2 LED STATUS INDICATORS ................................................................................................... 5-1
5.3 TYPICAL PROBLEMS AND SOLUTIONS ............................................................................. 5-1
5.4 CHANGING RF CHANNELS .................................................................................................. 5-2
i
Section I - General Information
1.1 INTRODUCTION
This manual provides information on the operation of
JetWeigh-W™ Wireless Aircraft Weighing System series aircraft electronic weighing kits manufactured by
Vishay SI Technologies. JetWeigh-W™ Wireless Aircraft Weighing Systems (Figure 1-1) integrate stateof-the-art wireless communication, digital weight processing, and high-accuracy hermetically sealed load
cells. Combined technologies from Vishay Revere
Transducers and Vishay RFWaves results in an accurate, high-reliability, robust, and easy to use Wireless
Aircraft Weighing System.
JetWeigh-W kits are designed primarily for the weighing of aircraft and aerospace vehicles, but can be
used for other precision weighing applications, as well
as for the calibration of force generating machines.
The kits have been calibrated using dead weight machines. These machines are maintained to better than
±0.001% with respect to the nominal weight value. The
degree of uncertainty for all of the individual weights
is approximately ±0.005% with respect to true values.
All readings are corrected to standard gravity factor
“g” as required by MlL-W-7327C.
High capacity JetWeigh-W kits with load cell capacities of 200,000 lb are calibrated on Vishay Revere’s
high capacity precision hydraulic transfer standard.
On completion of this calibration, the JetWeigh data is
verified on the dead weight machine up to the 100,000lb point. Maximum acceptable deviation between the
transfer standard and dead weight data is ±0.05%.
Both the dead weight machine and the transfer standard are secondary standards and are directly traceable to NIST.
It is recommended that the kit be returned to the factory for routine calibration every twelve (12) months or
sooner if trouble is observed or erroneous readings
are suspected.
The load imposed on a load sensor produces an
output signal directly proportional to the load applied.
The signal is transmitted through a wireless channel
to the JetWeigh handheld terminal where the measurement is processed. Analog load sensor signals
are processed digitally to remove linearity errors,
latitude and altitude effects. Presentation in pounds
or kilograms is selectable by the operator. An
integral printer provides a permanent record of all
pertinent weighment information including any
deviations that are accepted by the operator.
IntroductionIntroduction
Introduction
IntroductionIntroduction
Figure 1-1. Typical JetWeigh-W™ Aircraft Weighing System
Page 1-1
IntroductionIntroduction
Introduction
IntroductionIntroduction
1.2 SYSTEM COMPONENT
DESCRIPTIONS
Each kit contains the necessary equipment for weighing an aircraft with the exception of specialized jacks .
Kit contents include 3 to 5 wireless load cells, a rugged handheld PC user terminal, a thermal printer, power
adaptors and a power cord, a center of gravity accessory kit, and a rugged fiberglass carrying case.
1.2.1 Wireless Handheld Terminal
The wireless handheld PC terminal features a graphic
color touch screen display, intuitive step-by-step operation, and advanced functions such as CG calculation, aircraft type library, weighing history, latitude and
altitude adjustment. It communicates with up to 5 remote wireless load cells thereby eliminating cumbersome interconnecting cables.
Units operate in a world wide license-free band - 2400
MHz to 2483.5 MHz and comply with all FCC, CE,
ETSI standards.
Synchronized sampling of all load cells ensures correct weighing even under severe vibration and oscillations conditions.
1.2.2 Wireless Load Cells
Each kit contains from 3 to 5 hermetically sealed wireless load cells. These cells are precision devices and
will withstand 150% overload without damage. Dropping a load cell, however, could damage the electronic box, the diaphragm, or other components affecting its operation or accuracy.
Each cell has a tapped hole on the bottom to receive a
plug or a ring jack adapter. The top surface has a ¾”
radius concave surface to receive either the spherical
surface of an adapter or the aircraft jack pad directly.
NOTE: Load cells of identical capacity are interchangeable. However, load cells and spherical adapters are
color coded as matched sets. When changing load
cell locations, make sure that the spherical adapter/
load cell combination remains intact.
1.2.3 Load Cell Adapters
For the purpose of mounting load cells under varying
physical arrangements, several adapters are provided
(See Figure 1-2):
Figure 1-2. Jack Adapters
b) Spherical adapters to allow interfacing transi-
tion between the cells and conical jack pads or
flat surfaces
c) Axle adapters which allow transition from the
cell to the cylindrical surface of the axle.
1.2.4 Thermal Printer
JetWeigh-W systems ship with a high speed thermal
printer. At the end of each weighment, aircraft specifications, resultant weight data, and all other calculations can be printed and stored for future reference.
The printer is compact, easy to install, and require
minimal maintenance. A complete reference manual
for the printer is included with the kit.
a) Plug and ring adapters for securing the cell to
the hydraulic jack.
Page 1-2
Section II - Pre-Operation
Pre-operationPre-operation
Pre-operation
Pre-operationPre-operation
2.1 PRE-OPERATIONAL PROCEDURES
Section II presents all procedures that must be performed
prior to actual aircraft weighment. Since the JetWeighW system is completely wireless, no cable connection/
installation procedures are required. With an operating
range of 220 feet (70 meters), it should be easy to locate all load cells and the handheld terminal in functional
proximity to one another.
2.1.1 Load Cell Jack Point Configuration
JetWeigh-W Systems accommodate jack point configurations for 3-point, 4-point (helicopter or fixed wing) and
5-point aircraft. Recommended deployment of the load
cells is shown in Table 2-1. Make sure to match the load
cells and the mechanical adapters to ensure good repeatability of weighments.
2.1.2 Preparation for Aircraft Weighing
1. Review the Equipment List of the aircraft being
weighed. Update the list as required. Make sure the
particular equipment, which will normally be installed,
but is missing at the time of the weighing, is added in
the later calculations.
2. Remove all equipment, which will not be included in
the above list.
CAUTION
Use proper adapters to prevent jacks from
slipping or buckling. Damage to the aircraft or
inaccurate weight readings may result if improper
adapters are used. Never apply load to the rim of
the cell.
Color coded spherical adapters must be used in
conjunction with color coded load cells.
9. It is recommended that the load sensors be exercised prior to performing an actual weighment.
Exercise the load sensors 2 – 3 times by lifting the
aircraft with the load sensors and jacking system in
place.
10. The JetWeigh-W is programmed to identify left,
right, nose, or the sum of both sensors on a bogie.
This requires that specific channels (load cells) be
dedicated to a specific location when preparing for
a weighment. These location identifiers will normally appear on the printout. However, they will not
appear during 1 and 2 channel operation. Table 2-1
shows the recommended layout for various configurations.
Table 2-1. Jack Point Configuration
3. Clean the aircraft to remove accumulated dirt, grease
and trapped water.
4. Fill the oil tanks to a known quantity. Fill all reservoirs, such as anti-icing fluid, to capacity.
5. Drain fuel tanks. If draining is not practical, fill the
tanks to capacity. Add or account for unusable fuel.
6. Determine the unit weight of fuel. Obtain a sample
from the fuel tank with the supplied fuel dipper (CG
kit) and pour the sample into the test tube. Using the
hydrometers (CG kit), the weight of fuel in pounds per
gallon can be observed. Variations in fuel weight, particularly in the case of jet aircraft, can cause
appreciable difference in the final empty weight and
CG determinations. Be alert for partially filled nonsymmetrical fuel tanks.
7. With tricycle gear aircraft, it is often desirable to
level the aircraft as closely as possible before lifting
on the jacks. Changing oleo strut extensions can do
this.
8. A stabilizing period of 20 minutes running concurrently with warm-up period is advisable. When using
jack adapters, be sure the adapter is fully threaded into
the cell. With ring adapters, make sure it is centered
flush on the ram before tightening the set screws.
3 Load Cells
Channel 1 Red Left
Channel 2 Yellow Right
Channel 3 Blue Nose
4 Load Cells Helicopter Fixed Wing
Channel 1 Red Fwd Left Left
Channel 2 Yel Fwd Right Right
Channel 3 Blue Aft Left Nose
Channel 4 Orng Aft Right Spare
5 Load Cells
Channel 1 Red Left (1)
Channel 2 Yellow Right (1)
Channel 3 Blue Left (2)
Channel 4 Green Right (2)
Channel 5 White Nose
Page 2-1
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