INSTRUCTION BOOK
A
OPERATING INSTRUCTIONS
TERMALINE
COAXIAL LOAD RESISTOR
MODEL 8251D208
Electronic Corporation
Cleveland (Solon) Ohio US
Copyright 1998 by Bird Electronic Corporation
Instruction Book Part Number 920-8251D208 Rev. A
Termaline
is a Registered Trademark of
Bird Electronic Corporation
Safety Precautions
The following are general safety precautions that are not necessarily related
to any specific part or procedure, and do not necessarily appear elsewhere in
this publication. These precautions must be thoroughly understood and apply
to all phases of operation and maintenance.
Keep Away From Live Circuits
Operating Personnel must at all times observe general safety precautions. Do
not replace components or make adjustments to the inside of the test equipment with the high voltage supply turned on. To avoid casualties, always remove power.
Shock Hazard
Do not attempt to remove the RF transmission line while RF power is present.
Do Not Service Or Adjust Alone
Under no circumstances should any person reach into an enclosure for the
purpose of service or adjustment of equipment except in the presence of someone who is capable of rendering aid.
Safety Earth Ground
An uninterruptible earth safety ground must be supplied from the main
power source to test instruments. Grounding one conductor of a two conductor power cable is not sufficient protection. Serious injury or death can occur
if this grounding is not properly supplied.
Resuscitation
Personnel working with or near high voltages should be familiar with modern
methods of resuscitation.
Safety Symbols
WARNING
Warning notes call attention to a procedure, which if not correctly
performed, could result in personal injury.
i
CAUTION
Caution notes call attention to a procedure which if not correctly
performed, could result in damage to the instrument.
This symbol appears on the equipment indicating there is
important information in the instruction manual regarding
that particular area.
Note: Calls attention to supplemental informa-
+
tion.
Warning Statements
The following safety warnings appear in the text where there is danger to operating and maintenance personnel and are repeated here for emphasis.
WARNING
The vent plug must be used at all times when the unit is in operation
or cooling. Failure to do this could result in damage to the equipment
and endanger the operator’s safety. Be sure to check this plug.
WARNING
Using this load in the upper end of its power dissipation range will
cause the housing to become hot! Care should be exercised in touching
it.
WARNING
Never attempt to connect or disconnect RF equipment from the
transmission line while RF power is being applied. Leaking RF energy
is a potential health hazard.
Caution Statements
The following equipment cautions appear in the text whenever the equipment
is in danger of damage, and are repeated here for emphasis.
CAUTION
This equipment is designed for operation in a horizontal position only,
with mounting brackets down. Do not operate in any other manner.
CAUTION
Do not operate this equipment over the rated 1000 watts continuously.
Damage to the resistive element will result.
ii
CAUTION
The unit is factory filled to the proper level with 1.1 gallons (4.2 liter)
of Bird P/N 5-1070. No other coolant should be used
CAUTION
Do not leave out the O-Ring seal, P/N 5-504 when interchanging the
vent and shipping plugs.
Safety Statements
USAGE
ANY USE OF THIS INSTRUMENT IN A MANNER NOT
SPECIFIED BY THE MANUFACTURER MAY IMPAIR
THE INSTRUMENT’S SAFETY PROTECTION.
USO
EL USO DE ESTE INSTRUMENTO DE MANERA NO ESPECIFICADA POR EL FABRICANTE, PUEDE ANULAR
LA PROTECCIÓN DE SEGURIDAD DEL INSTRUMENTO.
BENUTZUNG
WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET
ALS VOM HERSTELLER BESCHRIEBEN, KANN DIE
GERÄTESICHERHEIT BEEINTRÄCHTIGT WERDEN.
UTILISATION
TOUTE UTILISATION DE CET INSTRUMENT QUI
N’EST PAS EXPLICITEMENT PRÉVUE PAR LE FABRICANT PEUT ENDOMMAGER LE DISPOSITIF DE PROTECTION DE L’INSTRUMENT.
IMPIEGO
QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO DIVERSO DA COME SPECIFICATO DAL
PRODUTTORE LA PROZIONE DI SICUREZZA
POTREBBE VENIRNE COMPROMESSA.
iii
SERVICE
SERVICING INSTRUCTIONS ARE FOR USE BY SERVICE - TRAINED PERSONNEL ONLY. TO AVOID DANGEROUS ELECTRIC SHOCK, DO NOT PERFORM ANY
SERVICING UNLESS QUALIFIED TO DO SO.
SERVICIO
LAS INSTRUCCIONES DE SERVICIO SON PARA USO
EXCLUSIVO DEL PERSONAL DE SERVICIO CAPACITADO. PARA EVITAR EL PELIGRO DE DESCARGÉAS ELÉCTRICAS, NO REALICE NINGÚN
SERVICIO A MENOS QUE ESTÉ CAPACITADO PARA
HACERIO.
WARTUNG
ANWEISUNGEN FÜR DIE WARTUNG DES GERÄTES
GELTEN NUR FÜR GESCHULTES FACHPERSONAL.
ZUR VERMEIDUNG GEFÄHRLICHE, ELEKTRISCHE
SCHOCKS, SIND WARTUNGSARBEITEN
AUSSCHLIEßLICH VON QUALIFIZIERTEM SERVICEPERSONAL DURCHZUFÜHREN.
ENTRENTIEN
L’EMPLOI DES INSTRUCTIONS D’ENTRETIEN DOIT
ÊTRE RÉSERVÉ AU PERSONNEL FORMÉ AUX OPÉRATIONS D’ENTRETIEN. POUR PRÉVENIR UN CHOC
ÉLECTRIQUE DANGEREUX, NE PAS EFFECTUER
D’ENTRETIEN SI L’ON N’A PAS ÉTÉ QUALIFIÉ POUR
CE FAIRE.
ASSISTENZA TECNICA
LE ISTRUZIONI RELATIVE ALL’ASSISTENZA SONO
PREVISTE ESCLUSIVAMENTE PER IL PERSONALE OPPORTUNAMENTE ADDESTRATO. PER EVITARE PERICOLOSE SCOSSE ELETTRICHE NON EFFETTUARRE
ALCUNA RIPARAZIONE A MENO CHE QUALIFICATI A
FARLA.
iv
About This Manual
This instruction book covers the model 8251D208 Termaline Coaxial Resistor.
This instruction book is arranged so that essential information on safety is
contained in the front of the book. Reading the Safety Precautions Section before operating the equipment is strongly advised.
The remainder of this instruction book is divided into Chapters and Sections.
Operation
First time operators should read Chapter 1 - Introduction, Chapter 2 - Theory
of Operation, and Chapter 3 - Installation to get an overview of equipment capabilities and how to install it. An experienced operator can refer to Chapter
4 - Operating Instructions. All instructions necessary to operate the equipment, are contained in this chapter.
Maintenance
All personnel should be familiar with preventive maintenance found in Chapter 5 - Maintenance. If a failure should occur, the troubleshooting section will
aid in isolating and repairing the failure.
Parts
For location of major assemblies or parts, refer to the parts lists and associated drawings in Chapter - Maintenance.
Changes To This Manual
We have made every effort to ensure this manual is accurate. If you should
discover any errors, or if you have suggestions for improving this manual,
please send your comments to our factory. This manual may be periodically
updated. When inquiring about updates to this manual refer to the part
number and revision level on the title page.
v
Bird Model 8251D208 Termaline Coaxial Load Resistor
vi
Table Of Contents
Safety Precautions. ......................i
Warning Statements. ......................ii
Caution Statements........................ii
Safety Statements. .......................iii
About This Manual. .......................v
Introduction. ........................1
Purpose and Function. ...................1
Applications. .......................1
Performance Characteristics and Capabilities. .........1
Power and Utility Requirements................1
Environmental Requirements. ................2
Items Supplied. ......................2
Items Required. ......................2
Tools and Test Equipment . .................2
Specifications. .........................3
Theory of Operation. .....................5
Cooling. .........................5
Installation. .........................7
Location. .........................7
Shipping and Vent Plugs. ..................7
Connecting to Transmitter. ....................8
Operating Instructions. ....................9
Normal Operation. .....................9
vii
Bird Model 8251D208 Termaline Coaxial Load Resistor
Operation Under Abnormal Conditions. ............9
Shutdown. ........................9
Emergency Shutdown. ...................10
Maintenance. ........................11
Troubleshooting. ........................11
Cleaning. ...........................11
Inspection. ..........................12
Preventive Maintenance. ....................12
Checking Coolant Level. ..................12
DC Resistance Measurement. ..................13
Preparation and Tools Required. ..............13
Checking the DC Resistance . ...............13
Disassembly. .........................14
Tools Required.......................14
RF Connector. ......................14
Rear Seal and Coolant. ..................15
RF Load Resistor Assembly. ................15
Radiator Handle. .....................15
Assembly............................16
RF Connector. ......................16
Diaphragm and Coolant Oil. ................16
RF Load Resistor Assembly. ................16
Radiator Handle. .....................16
Storage. ...........................17
Customer Service. .......................17
Sales/Repair Facilities. ..................17
viii
Sales Facilities. .....................17
Preparation for Shipment. ....................17
Replacement Parts List......................18
ix
Bird Model 8251D208 Termaline Coaxial Load Resistor
x
Chapter 1
Introduction
This publication covers the Termaline Coaxial Load Resistor
Model 8251D208. The Termaline Coaxial Load Resistor will
generally be referred to as a load thoughout this manual.
This chapter contains introductory information including
product specifications; items supplied; and accessory items
available.
Purpose and
Function
The Bird Termaline Coaxial Load Resistor is a portable,
general purpose 50 ohm coaxial transmission line termination. The load is a low reflection, nonradiating termination
for coaxial transmission lines operating in the UHF (470 860 MHz) band.
The load is rectangular in shape with transverse fins encasing a dielectric coolant cylinder. A retractable handle is recessed in the radiator fins. The front and rear fins are made
of heavier gauge material and are bent 90° to form bottom
mounting flanges. These flanges are supports for free standing use, or brackets for fixed mounting. Holes are provided
in the flanges for fixed mounting.
Applications Use these loads:
s
s
s
Performance
Characteristics
Capabilities
The Model 8251D208 load can absorb up to 1000 watts continuously and dissipate it harmlessly as heat over a fre-
and
quency range of 470 to 860 MHz. The actual VSWR, “voltage
standing wave ratio”, will not exceed 1.065:1 over the frequency range stated.
As a substitute antenna for tuning transmitters under nonradiation conditions or making
routine test and adjustments.
As a substitute for any circuit loading element.
To measure, with a suitable indication device,
the power output of any coaxially transmitted
signal within their range.
Power and
Requirements
Utility
This load is a passive device that is self-contained and requires only RF input to function.
1
Bird Model 8251D208 Termaline Coaxial Load Resistor
Environmental
Requirements
Items Supplied
Items
Required
Tools and
Test
Equipment
The load should be operated in a dust and vibration free,
dry environment. Allow at least 6 inches (153 mm) of clearance around the unit to permit adequate heat dissipation.
Load Resistor
s
Instruction Book
s
Matching connector on the coaxial transmission line to
which the load will be attached.
Screwdriver and an adjustable wrench will be necessary for
disassembly of this equipment.
A resistance bridge or ohmmeter with an accuracy of one
percent or better at 50 ohms is useful for checking the resistance value of the RF section assembly.
2
Introduction
Specifications
Impedance, Nominal 50 ohms
VSWR: 1.065:1
Connector: 1-5/8" EIA flanged
Power Range: 1000 watts continuous
Frequency Range: 470 to 860 MHz
Ambient Temperature: -40°C to +45°C (-40°F to +133°F)
Cooling Method Oil dielectric and convection currents
Dimensions: 17-29/32"L x 5-15/16"W x 8-1/2"H
(455 x 151 x 216 mm)
Weight:
Net
Shipping
Operating Position: Horizontal only - vent plug up
Finish: Grey Powder Coat
European Safety: Meets European Standard EN 61010-1:1993 -
25 lb. 8 oz. (11.6 kg)
30 lb. (13.6 kg)
Safety, Group II. In accordance with Council Directive 73/23/EEC and 93/68/EEC.
3
Bird Model 8251D208 Termaline Coaxial Load Resistor
4
Chapter 2
Theory of Operation
This load consists essentially of a carbon film resistor on a
ceramic substrate immersed in a dielectric coolant. The resistor, individually selected for its accuracy, is enclosed in a
special exponentially tapered housing. This provides a linear reduction in surge impedance directly proportional to
the distance along the resistor. When surrounded by the dielectric coolant, the characteristic impedance is therefore:
50 ohms at the front (connector end), 25 ohms at the midpoint (to compensate for the resistance already passed over),
and zero ohms at the rear where the resistor joins the housing, forming the return conductor of the coaxial circuit. This
produces a uniform, practically reflectionless line termination over the stated frequencies of the load resistor.
Cooling The dielectric coolant was chosen for its desirable dielectric
and thermal characteristics. Cooling of the load is accomplished by natural fluid and air convection currents. The 1.1
gallons (4.2 liters) of dielectric coolant carries the electrically generated heat from the resistor to the walls of the cylindrical cooling tank. This tank is encased in a set of
radiating fins, constructed from heavy gauge aluminum alloy, and firmly pressed into the cylinder. The heat from the
dielectric oil is transferred to the surrounding air by the
fins.
Expansion of the coolant, caused by the rise in its temperature, is allowed for by the use of an expansion tank located
on the upper rear of the load. The expansion tank is
equipped with a spring loaded vent for relief of the internal
pressure.
5
Bird Model 8251D208 Termaline Coaxial Load Resistor
Figure 1
Shipping Plug
O-ring seal
Figure 2
Vent Plug
O-Ring Seal
6
Chapter 3
Installation
CAUTION
This equipment is designed for operation in a
horizontal position only, with mounting brackets down.
Do not operate in any other manner.
The load is to be installed, and operated in a horizontal position. The load is shipped horizontal, and normally stands on
its base brackets.
The load may be used for portable operation and stand free,
or it may be secured to a bench top or other flat surface for a
fixed installation. Mount the load with four screws of up to
1/4 inch diameter. Fasten the screws through the four 9/32
inch holes in the mounting brackets that arranged in a 5-1/8
inch x 15 inch (130.2 x 381 mm) rectangle.
Location For operation above 300 watts allow at least six inches (153
mm) of clearance on each side. Operate the load in a horizontal position only, with the handle on top.
Shipping and
Vent Plugs
WARNING
The vent plug must be used at all times when the unit
is in operation or cooling. Failure to do this could
result in damage to the equipment and endanger the
operator’s safety. Be sure to check this plug.
CAUTION
Do not leave out the O-Ring seal, P/N 5-504 when
interchanging the vent and shipping plugs.
Before placing the unit into operation, remove the shipping
plug on the top of the radiator and replace with the vent
plug supplied. Refer to figures 1 and 2 for identification of
the plugs. Don’t forget to use the O-Ring seal, P/N 5-504.
The shipping and vent plugs are connected with a short
length of bead chain to prevent the mislaying or loss of the
unused plug.
7
Bird Model 8251D208 Termaline Coaxial Load Resistor
Connecting to
Transmitter
the
Connect the load to the transmitting equipment under test
with 50 ohm coaxial cable (RG-8A/U, RG-9/U, RG-213/U or
equivalent). After the transmitter has been connected to the
load, proceed according to the transmitter manufacturer’s
instructions. When reconnecting the antenna, it may be necessary to slightly readjust the transmitter due to possible
differences in VSWR between the load and the antenna system.
The 1-5/8 inch EIA flange connector is fastened to the transmission line by four 5/16-18 x 1-1/2 bolt sets. The center conductors must be joined with a bullet for 50 ohm 1-5/8 inch
coaxial lines. Bird P/N 4712-020 Bullet Kit includes the bolt
sets, O-Ring, and center conductor bullet.
Note: Avoid the use of adapters and elbows
+
whenever possible.
Refer to figure 3 while following the instructions below.
1. Seat the bullet so that half of the thickness of
the insulator is nested in the counterbore of each
connector flange.
2. Place the load resistor so that it will be aligned
with the coaxial input line.
3. Push in on the center contact.
Figure 3
Connection to
Transmitting
Equipment
8
4. Tighten the flange nuts evenly all around (finger
tight).
5. Tighten the nuts evenly with wrenches.
RF Coaxial Line
Bolt
Bullet
Flange
Normal
Operation
Operation
Under
Abnormal
Conditions
Chapter 4
Operating Instructions
CAUTION
Do not operate this equipment over the rated 1000
watts continuously. Damage to the resistive element
will result.
The load has no indicators or operating controls, therefore it
requires no special operating procedures or surveillance
when the stated performance limits are not exceeded. Follow the instructions pertaining to the specific transmitting
equipment.
WARNING
Using this load in the upper end of its power
dissipation range will cause the housing to become hot!
Care should be exercised in touching it.
These units will sustain an input moderately greater than
1000 watts for short periods of time. Such loading must be
spaced at reasonable intervals to allow sufficient time for
the load to cool to a safe temperature. The load can, for instance, sustain an input of 1200 watts for a maximum of
five minutes with an interval of at least 30 minutes between
each power application.
Shutdown These loads, being passive devices, have no way of being
turned off. Their source of RF power must be turned off instead.
9
Bird Model 8251D208 Termaline Coaxial Load Resistor
Emergency
Shutdown
WARNING
Never attempt to connect or disconnect RF equipment
from the transmission line while RF power is being
applied. Leaking RF energy is a potential health
hazard.
Turn off RF power at the source.
10
Chapter 5
Maintenance
This chapter contains information for cleaning, inspection,
troubleshooting, and performance of this load.
Troubleshooting
Refer to this table when troubleshooting the load for aid in
isolating the problem, and for possible causes and remedies.
Table 1
Troubleshooting
Problem Possible Cause Remedy
Coolant oil leak
around clamping
bands or radiator
housing
Overheating of
the radiator
Clamping bands not
tight
Faulty O-Ring
(front)
Faulty O-Ring (rear) Replace O-Ring
Transmitter power
too high
Coolant oil level too
low
Accumulation of dirt
on cooling fins
Faulty RF section
assembly, check dc
resistance
Tighten screw
slightly with a
screwdriver
Replace O-Ring
Reduce transmitter power
Add more coolant oil to the radiator
Clean cooling
fins
Replace if
needed
Cleaning
The outside surface of the load should be wiped free of dust
and dirt when necessary. The principal maintenance required by the operator will be to periodically wipe off the accumulated dust and lint from the radiator fins. Excessive
collection of dust and lint on the cooling fins will interfere
with the efficient dissipation of heat. If the teflon insulator
or metallic contact surfaces of the connector should become
dirty, wipe them off with a soft cloth. If it becomes necessary to use a cleaner, use a contact cleaner that is selfdrying and leaves no residue on the inaccessible internal
parts of the connector.
11
Bird Model 8251D208 Termaline Coaxial Load Resistor
Inspection
With the rugged and simple construction of the loads, periodic inspection will be necessary at only about six month intervals. Inspection should include the items listed below:
1. Oil Leakage - check for coolant oil leaking
around the radiator tank, particularly at the
front and back around the underside of the
clamping band. If leakage is observed, refer to
the troubleshooting section and, check tightness
of the front and rear clamping bands.
2. Inspect the load for dirt or dust buildup.
3. Inspect the load for completeness and general
condition of the equipment.
Preventive Maintenance
Due to the basic simplicity of construction, the major requirement for preventive maintenance is to keep the equipment clean, particularly the radiator fins. It is important to
maintain the heat transfer efficiency of the cooling fins.
Also, occasionally check the coolant level in the radiator
tank.
Checking
Coolant Level
12
CAUTION
The unit is factory filled to the proper level with 1.1
gallons (4.2 liter) of Bird P/N 5-1070. No other coolant
should be used
1. Remove the vent plug from the socket on the top
surface of the expansion tank. Unscrew the vent
plug using a 3/4 inch wrench.
+
Note: The coolant level, at room temperature,
should not be more than 1/8 inch above the bottom surface of the expansion tank.
2. Check the coolant level by carefully lifting the
front end of the load and noting presence of coolant on the bottom surface. The coolant quantity
should be sufficient to fill the radiator cylinder.
The inner housing, for the resistor element, is
specially shaped to match the dielectric properties of the recommended coolant.
3. Replace vent plug. If coolant needs to be added,
refer to the RF Load Resistor section.
DC Resistance Measurement
Maintenance
Preparation
and Tools
Required
Be sure that the vent plug is installed.
Preparation:
Tools: Common hand tools
s
Ohmmeter with an accuracy of ± 1% at 50
s
ohms.
Temperature of the load between 20°C to 25°C
s
(68°F to 77°F)
Accurate measurement of the dc resistance between the inner and outer conductors of the RF input connector will provide a good check of the condition of the load resistor.
Checking the dc resistance is simply used to measure a
change in the condition of the resistor over time. The tracking of the dc resistance must start before the resistor is first
put into service. Perform the following steps and record the
value for future comparison. Check and record the resistance of the load periodically according to use.
WARNING
Never attempt to connect or disconnect RF equipment
from the transmission line while RF power is being
applied. Leaking RF energy is a potential health
hazard.
Checking the
DC Resistance
Measure the dc resistance. Follow the instructions below.
1. Turn off RF power and interlock circuitry before
any electrical disconnection’s are made.
2. Disconnect the RF coaxial line.
3. Connect the multimeter test leads across the center and outer conductor of the load resistor. Refer
to figure 4 for placement of the leads.
4. Record the value of the resistance before the load
is put into service. Compare subsequent values
with the latest reading. If the values vary more
than 2 ohms this could be an indication of a failing resistive element.
13
Bird Model 8251D208 Termaline Coaxial Load Resistor
Figure 4
Measuring DC
Resistance
50.0
These tests are by no means a necessity to the operation of
the load but merely guidelines for the users information.
Disassembly
There are no special techniques required for the repair or
replacement of components in this Termaline Load Resistor.
Tools
Required
s screwdriver
s small wrench
s
adjustable wrench (for the connector bolts)
RF Connector The Model 8251D208 has a 1-5/8 inch EIA flanged connector
and must be returned to the factory for connector replacement.
Rear Seal and
Coolant
Before any disassembly of the rear of the load, if the coolant
has not already been drained from the tank, stand the radiator on end with the connector pointed down.
1. Unscrew the four 10-32 screws at the corners of
the guard cover.
2. Unscrew the tube nut from the tank nozzle, using a small wrench if necessary, and pull the
nozzle free.
3. Loosen the clamp screw with a screwdriver from
the bottom of the clamping band, same type as at
the front, and remove the clamping band.
4. Remove the rear cover which includes the attached escape tube with captive nut, P/N 2430088, and the diaphragm seal, P/N 2430-089.
14
RF Load
Resistor
Assembly
Maintenance
5. Inspect the diaphragm seal and replace it if it is
not soft and pliable, or shows signs of surface
cracks.
6. Replace the coolant if it appears contaminated,
i.e., if it is not clear.
The expansion tank is vented through the vent plug, P/N
2450-094. The unit unscrews from a socket on top of the
tank, but is not itself subject to disassembly.
The shipping plug is sealed by compression of an O-Ring,
P/N 5-504, which should be included when replacing the
vent plug.
CAUTION
Do not leave out the O-Ring seal, P/N 5-504 when
interchanging the vent and shipping plugs.
1. Replace the vent plug with the shipping plug in
the fill hole of the expansion tank to prevent
coolant loss. Refer to figures 1 and 2 for plug
identification.
Radiator
Handle
2. Stand the unit on its back end, i.e., vertically
with the RF connector up. Brace the unit in this
position to prevent it from tipping over.
3. Loosen the 10-32 x 1-1/2 inch screw on the
clamping band until the band is free. Remove the
band.
4. Grasp the RF connector and slowly lift the load
resistor assembly out of the radiator tank to allow the excess coolant to drip back in.
5. Before replacing the load assembly check the ORing seal to be sure it is properly placed and is
in good condition. It should be free of twists and
positioned evenly around the beveled flange of
the resistor housing. Also, it should still be soft
and pliable and not hard or showing signs of surface cracks.
The radiator handle slides on and is held in place by the two
retaining studs that are riveted to the fins. It may be removed or replaced as follows:
15
Bird Model 8251D208 Termaline Coaxial Load Resistor
1. Gently pry apart the fins next to each stud just
enough to clear the handle thickness.
2. With the fins pried apart sufficiently, slide each
leg of the handle off its respective stud.
Assembly
Diaphragm
and Coolant
Oil
RF Load
Resistor
Assembly
To assemble the unit after replacing the diaphragm or adding coolant, follow the instructions below.
1. Install the diaphragm and the rear cover.
2. Install the clamping band and tighten the clamp
screw with a screwdriver.
3. Install the tank nozzle and tighten the tube nut.
4. Install the guard cover with the screws previously removed.
To assemble the unit after replacing the RF load resistor,
follow the instructions below.
1. Grasp the RF connector and slowly lower the
load resistor assembly into the radiator tank.
2. Install the clamping band and tighten the 10-32
x 1-1/2 inch screw on the clamping band.
3. Place the load in a horizontal position on a firm
surface.
4. Replace the shipping plug with the vent plug in
the fill hole of the expansion tank.
To install a new radiator handle, after having removed the
defective handle, follow the instructions below.
16
Radiator
Handle
1. Place each leg of the new handle over the studs
that the original handle was on.
2. Gently pry the fins until they are in their original position, and the handle will not come off of
the studs.
Maintenance
Storage
No special preparations for storage are necessary other than
to cover the equipment to keep out dust and dirt. Store the
unit in a dry and dust-free environment where the ambient
temperature will remain within the -40°C to +45°C (-40°F to
+113°F) working range of the load.
Customer Service
Any maintenance or service beyond the scope of those provided in this section should be referred to a qualified service
center.
Any equipment returned must be shipped prepaid and to
the attention of the Service Group.
Bird Electronic Corporation maintains a complete repair
and calibration facility at the following address:
Sales/Repair
Facility
Sales
Facilities
Preparation
for Shipment
U.S.A. Sales and Manufacturing
Service Group
Bird Electronic Corporation
30303 Aurora Road
Cleveland (Solon), Ohio 44139-2794
Phone: (440) 248-1200
Fax: (440) 248-5426
For the sales office nearest you, call Bird Electronic Corporation at the above telephone number, or visit our Web site
at:
http://www.bird-electronic.com
Should you need to return the load, use the original ship-
ping package if possible. Wrap the RF connector with padding and tape securely in place. It is not necessary to
remove the coolant to ship the load. Simply replace the vent
plug with the shipping plug attached to the bead chain. Be
sure the O-Ring seal is mounted on the plug to avoid leakage.
17
Bird Model 8251D208 Termaline Coaxial Load Resistor
Replacement Parts List
Qty. Description Part Number
1
1
1
1.1 gals
(4.1 liter)
1
1
2
1
1
1
1
1
2
1
RF Section Assembly 8890-050
Radiator Assembly 2430-123
Diaphragm Cover Guard 2430-078
Coolant Oil - Dielectric
1 pint container
1 gallon container
5 gallon container
5-1070-1
5-1070-2
5-1070-3
Diaphragm Seal 2430-089
Diaphragm Cover 2430-088
Clamp Band Assembly (2430-043 & screw) 2430-055
RF Section O-Ring Seal 5-230
Vent Plug 2450-094
Shipping Plug 2450-049
Radiator Handle 2430-028
Chain Assembly 8180-094
Vent and Shipping Plug O-Ring 5-504
Expansion Tank, part of Radiator 2430-080
18
Limited Warranty
All products manufactured by Seller are warranted to be free from defects in
material and workmanship for a period of one (1) year, unless otherwise
specified, from date of shipment and to conform to applicable specifications,
drawings, blueprints and/or samples. Seller’s sole obligation under these warranties shall be to issue credit, repair or replace any item or part thereof
which is proved to be other than as warranted; no allowance shall be made
for any labor charges of Buyer for replacement of parts, adjustment or repairs, or any other work, unless such charges are authorized in advance by
Seller.
If Seller’s products are claimed to be defective in material or workmanship or
not to conform to specifications, drawings, blueprints and/or samples, Seller
shall, upon prompt notice thereof, either examine the products where they
are located or issue shipping instructions for return to Seller
(transportation-charges prepaid by Buyer). In the event any of our products
are proved to be other than as warranted, transportation costs (cheapest way)
to and from Seller’s plant, will be borne by Seller and reimbursement or
credit will be made for amounts so expended by Buyer. Every such claim for
breach of these warranties shall be deemed to be waived by Buyer unless
made in writing within ten (10) days from the date of discovery of the defect.
The above warranties shall not extend to any products or parts thereof which
have been subjected to any misuse or neglect, damaged by accident, rendered
defective by reason of improper installation or by the performance of repairs
or alterations outside of our plant, and shall not apply to any goods or parts
thereof furnished by Buyer or acquired from others at Buyer’s request and/or
to Buyer’s specifications. In addition, Seller’s warranties do not extend to the
failure of tubes, transistors, fuses and batteries, or to other equipment and
parts manufactured by others except to the extent of the original manufacturer’s warranty to Seller.
The obligations under the foregoing warranties are limited to the precise
terms thereof. These warranties provide exclusive remedies, expressly in lieu
of all other remedies including claims for special or consequential damages.
SELLER NEITHER MAKES NOR ASSUMES ANY OTHER WARRANTY
WHATSOEVER, WHETHER EXPRESS, STATUTORY, OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS, AND
NO PERSON IS AUTHORIZED TO ASSUME FOR SELLER ANY OBLIGATION OR LIABILITY NOT STRICTLY IN ACCORDANCE WITH THE
FOREGOING.
19
DECLARATION OF CONFORMITY
Manufacturer: Bird Electronic Corporation
Product: TERMALINE RF COAXIAL LOAD RESISTOR
The undersigned hereby declares, on behalf of Bird Electronic Corporation of
Cleveland, Ohio, that the above-referenced product, to which this declaration relates, is
in conformity with the provisions of the following standards;
1. European Standard EN 61010-1:1993 - Safety, Group II.
This standard is in accordance with Council Directive 73/23/EEC and 93/68/EEC.
The technical documentation file required by this directive is maintained at the corporate
headquarters of Bird Electronic Corporation, 30303 Aurora Road, Cleveland, Ohio.
30303 Aurora Road
Cleveland, Ohio 44139-2794
Model: 8251D208
Ken DeVore
QA/Metrology Manager
Bird Electronic Corporation
20
Loading...