INSTRUCTION BOOK
A
OPERATING INSTRUCTIONS
TERMALINE®WATTMETER
MODEL 6151A
Electronic Corporation
Cleveland (Solon) Ohio US
©
Copyright 1997 by Bird Electronic Corporation
Instruction Book Part Number 920-6151A Revision A
Termaline
®
and Thruline®are Registered Trademarks
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 inside
equipment with the high voltage supply turned on. To avoid casualties, always remove power.
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 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.
Shock Hazard
Do not attempt to disconnect an RF transmission line while RF power is present. Radiated RF power is a
potential health hazard.
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 performed correctly, could result in personal injury.
CAUTION
Caution notes call attention to a procedure which, if not correctly performed, could result in damage to the instrument.
This safety symbol appears on the the equipment indicating there is important information
in the instruction manual regarding that particular area.
+ Note: Calls attention to supplemental information.
6151A 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.
i
WARNING
Exposure to RF power radiation and the possibility of RF shock or burns exists with some operating conditions.
Always be sure to turn off transmitter when connecting or disconnecting wattmeter. When Plug-In Element is
removed from the RF line socket, the line section center conductor is exposed. Do not put fingers or other objects
into this Plug-In Element socket while RF power is applied.
WARNING
Do not attempt to operate the Termaline Wattmeter for prolonged periods at higher than read load levels. Damage to
the equipment and injury to operator may result.
WARNING
Never attempt to disconnect any RF equipment from the transmission line while RF power is being applied. Leaking
RF energy is a potential health hazard.
6151A 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
Do not drop the instrument or Plug-In Elements as damage to the meter could result or impair the accuracy of the
elements.
CAUTION
If other than Female N type connectors are used, limit power and frequency to the capabilities of the RF coaxial
cable or connectors used. Damage to connectors or errors in reading could result.
CAUTION
Do not replace coolant with anything but the specified fluid. The inner shell of the resistor housing is contoured to
the dielectric properties of this fluid. The use of any other type of coolant will affect the electrical performance of the
load.
ii
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.
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 DESCARGAS 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.
iii
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.
RF VOLTAGE MAY BE PRESENT IN RF ELEMENT SOCKET - KEEP ELEMENT
IN SOCKET DURING OPERATION.
DE LA TENSION H.F. PEAT ÊTRE PRÉSENTE DANS LA PRISE DE L’ÉLÉMENT
H.F. - CONSERVER L’ÉLÉMENT DANS LA PRISE LORS DE L’EMPLOI.
HF-SPANNUNG KANN IN DER HF-ELEMENT-BUCHSE ANSTEHEN - ELEMENT WÄHREND DES BETRIEBS EINGESTÖPSELT LASSEN.
PUEDE HABER VOLTAJE RF EN EL ENCHUFE DEL ELEMENTO RF - MANTENGA EL ELEMENTO EN EL ENCHUFE DURANTE LA OPERACION.
IL PORTAELEMENTO RF PUÒ PRESENTARE VOLTAGGIO RF - TENERE L’ELEMENTO NELLA PRESA DURANTE IL FUNZIONAMENTO.
iv
About This Manual
This instruction book covers the model 6151A Termaline Wattmeter.
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. At the beginning of each
chapter a general overview will be given, describing the contents of that chapter.
Operation
First time operators should read Chapter 1 - Introduction, 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 preventative 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 part lists and associated drawings in Chapter 5.
Changes To This Manual
We have made every effort to ensure this manual is accurate at the time of publication. 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 6151A Termaline Wattmeter
vi
Table Of Contents
Safety Precautions. ...................................i
Warning Statements. ...................................i
Caution Statements. ....................................ii
Safety Statements. ................................... iii
About This Manual. ................................... v
Introduction. ...................................... 1
Purpose and Function. ................................. 1
Description. ....................................... 1
Theory of Operation. .................................. 3
Travelling Waves. .................................... 3
Coupling Circuit. ..................................... 3
RF Load Section. .................................... 3
Installation. ....................................... 5
Location. ......................................... 5
Mounting. ......................................... 5
Latch Mechanism. .................................... 5
Input Connector. ..................................... 6
Transmitter Connection. ................................. 6
Operating Instructions. ................................ 7
Operating Precautions . ................................. 7
Operator’s Test for Accuracy. .............................. 7
Zero Adjust. ....................................... 7
Measuring Transmitter Power. ............................. 8
Use As Dummy Antenna. ................................ 8
Maintenance. ...................................... 9
Outside Surface. ..................................... 9
Tools Required. .....................................10
RF Connector. ......................................10
Diaphragm and Coolant Oil. ..............................10
vii
Bird Model 6151A Termaline Wattmeter
RF Connector. ..................................... 11
Diaphragm and Coolant Oil. .............................. 11
Sales/Repair Facility. ................................. 11
Sales Facilities..................................... 11
Load Resistor. ..................................... 12
Meter Portion. ..................................... 12
Low Frequency Line Section. ............................. 12
viii
Chapter 1
Introduction
Purpose and
Function
Description The Model 6151A Termaline Wattmeter consists of a coaxial load resistor, detector
The Bird Model 6151A Termaline RF Wattmeter is designed to measure RF power
under non-radiating conditions. The Wattmeter is coupled to an accurate 50 ohm
coaxial load resistor which becomes the transmitter load element, providing a
practically reflectionless coaxial line termination up to 2.3 GHz.
Power input to the load resistor is sampled by a coupler-detector type voltmeter
indicating directly in watts.
The Model 6151A is intended for general field and laboratory service use on CW,
AM and FM modulation envelopes, but not on pulsed modes.
circuit, dc cable, panel meter and its housing.
The load portion is comprised of an RF coaxial load resistor assembly encased in a
finned radiator. The detector circuit is in the Plug-in Element inserted in a short
length of 50 ohm coaxial line mounted on the front of the load portion. A 2-3/4 foot
(83.8 cm) coaxial cable (RG-58/U) connects the detector circuit to the meter which is
sealed and shock mounted in its housing.
The detector circuit in the Plug-in Element samples the RF energy travelling toward
the load, converts it to a small dc voltage for readout on the meter. The meter scale
is designed to indicate power directly in watts.
Specifications
Power Rating 100 W continuous
Power Ranges 25/50/100 Determined by plug-in
elements*
Input Impedance 50 ohms nominal
Frequency Range 2 to 2300 MHz Determined by plug-in
elements*
VSWR 1.1 to 1.0 max. dc to 1 GHz
1.25 to 1.0 max. 1 to 2.3 GHz
Accuracy ± 5% of full scale to 2.3 GHz
Input Connector Bird quick change “QC” type Female N
normally supplied.
Dimensions 12-27/32" L x 3-15/16" W x 6-11/32"H
(326 x 100 x 161 mm)
Weight, Nominal 8 lb (3.6 kg)
Finish Grey Powder Coat
*Refer to the Bird Electronic Corporation Catalog.
Any Element, up to 100 watts, may be selected from Tables I, II or III of the Catalog.
1
Bird Model 6151A Termaline Wattmeter
D.C. CABLE,
APPROX. 2-3/4' (83.8 cm)
LONG.
Model 6151A Outline Drawing
Figure 1
6-11/32
(161 mm)
DIRECT READING METER SCALE
IN WATTS
3-15/16
(100mm)
D.C. JACK
6-11/32
(100 mm)
LATCH
INPUT CONNECTOR,
FEMALE "N",
3-15/16
(100 mm)
13-1/64
(331 mm)
RETRACTABLE HANDLE
2
Chapter 2
Theory of Operation
Travelling Waves The voltage and current present on a transmission line are expressed as the sum of
the voltages and currents of two waves; forward and reverse. Both waves are identical
except in the direction of travel. The Model 6151A measurement concept basically
samples the voltage and current only of the wave travelling from the source to load.
The forward wave travels (and its power flows) from source to the load, and has RF
voltage E and current I in phase, with E/I = Zo. Note that the component wave is
mathematically simple, and is completely described by a single figure for power;
Watts = E
and the coaxial termination, simplifying matters by being a reasonably pure resistance of 50 ohms.
Coupling Circuit The coupling circuit which samples the RF power from the standing waves is in the
Plug-In-Element. The circuitry of the element and its relationship to the other
components of the Termaline are illustrated in the schematic diagram in figure 2.
Energy will be produced in the coupling circuit of the element by both mutual
inductance and capacitance from the travelling waves within the line section. The
inductive currents will flow according to the direction of the travelling waves
producing them. The capacitive portion of these currents are independent of the
direction of the travelling waves.
2
/R = I2R = EI. Zo is the characteristic impedance of the detector circuit
The electrical values of the element circuits are carefully balanced and designed to
be sensitive to the current produced from only the forward wave. Also, due to the
practically non-reflective characteristics of the termination, almost no reflected wave
will exist.
Figure 2
Coupler Circuit
Schematic Diagram
XMTR
or
LOAD
Directional Coupling
Detector Element
RF Coaxial Line
Diode
DC Contact
DC
Connector
Bypass
Meter
LOAD
or
XMTR
RF Load Section The RF load resistor of the Model 6151A Wattmeter consists of a cylindrical film
type resistor immersed in a dielectric coolant. The resistor, individually selected for
its resistive film accuracy, is enclosed in a special tapered housing which provides
a linear reduction in surge impedance directly proportional to the distance along the
resistor. This produces the uniform, practically reflectionless line termination over
the stated frequency range of the wattmeter. Refer to figure 3.
The coolant is chosen for its desirable dielectric properties and thermal characteristics. Cooling of the load is accomplished by natural fluid and air convection. The
3
Bird Model 6151A Termaline Wattmeter
dielectric coolant carries the electrically generated heat from the resistor to the walls
of the cylindrical cooling tank. The tank is encased in a set of metal radiation fins
to which heat is conducted and carried off by air convection.
A synthetic rubber diaphragm located in the rear dome on the load allows the coolant
to expand as the temperature rises.
Figure 3
RF Load Section
4
Chapter 3
Installation
This chapter provides information for preparing the 6151A for use.
Location Free air circulation around the wattmeter is essential. Position the Model 6151A
with clearance around it and do not place it near heated surfaces. The wattmeter
should have at least a 4 inch clearance on all sides. Keep the space above the Model
6151A unobstructed to provide adequate natural air convection for good heat transfer.
Use the wattmeter in a horizontal position only.
CAUTION
Do not drop the instrument or Plug-In Elements as damage to the meter could result or
impair the accuracy of the elements.
Mounting The Model 6151A Termaline Wattmeter is essentially a portable test instrument. It
should be placed as close as possible to the equipment of which the RF power is
being measured.
The wattmeter may be fastened to a work or test surface by removing the four rubber
bumpers from the bottom of the radiator. These bumpers are fastened to the radiator
brace by 8-32 studs which are molded permanently into the rubber feet. The bumpers
unscrew easily by hand. The holes are threaded for 8-32 screws. Fasteners must be
placed up through the work surface and into the radiator. These holes are on a 3
by 7 inch rectangle, (76 x 178 mm).
Latch Mechanism The meter housing is retained on the radiator by the bowed-spring action of the
latch spring, which is a rod of heavy wire. While following these instructions, refer
to figure 4.
Figure 4
Latch Operation
Button
Unlatched
Latched
5
Bird Model 6151A Termaline Wattmeter
To remove the meter case:
To assemble the meter case:
Input Connector
If other than Female N type connectors are used, limit power and frequency to the
capabilities of the RF coaxial cable or connectors used. Damage to connectors or errors in
1. Raise the buttons at the sides of the case, one at a time, to
lift the spring above the notch in the hook. Use a flat blade
screwdriver.
2. Pull the housing straight off of the radiator.
3. Place the meter in a position where the meter can be easily
read while the transmittter is being adjusted. The meter
may be read either standing or on its’ back.
1. Coil the dc cable so that it will allow the meter case to be
replaced properly on the load.
2. Engage the spring, first one button, then the other. The
second button will resist with stiff spring action.
3. Check for proper engagement by pulling on the meter case.
CAUTION
reading could result.
Transmitter
Connection
The Model 6151A is normally supplied with a Female N type connector which is of
the Bird Quick-Change design. Other “QC” connectors are available and may be
purchased from Bird Electronic Corporation as required. A list of available connectors
is in Chapter 5 - Replacement Parts List.
The connectors are quickly changed by following the instructions below:
1. Remove the four 8-32 pan head machine screws from the
corners of the connector flange.
2. Pull the connector straight out.
3. Reverse this procedure to install a connector, making sure
the center contact pin is properly aligned with the socket.
Connection to the transmitter is made through a suitable coaxial cable equipped with
appropriate RF connectors. It is advisable to keep the length of this cable as short
as possible.
1. Connect the wattmeter to the transmitter with a short
length of 50 ohm coaxial cable such as RG-58C/U (preferably
under 5 feet in length).
2. The wattmeter is ready to be used for power measurements.
+ Note: There may be a slight deviation in the electrical specifications if a
connector, other than a Female N type (normally supplied) is used.
6
Operating
Precautions
Chapter 4
Operating Instructions
WARNING
Exposure to RF power radiation and the possibility of RF shock or burns exists with some
operating conditions. Always be sure to turn off transmitter when connecting or
disconnecting wattmeter. When Plug-In Element is removed from the RF line socket, the
line section center conductor is exposed. Do not put fingers or other objects into this
Plug-In Element socket while RF power is applied.
WARNING
Never attempt to disconnect any RF equipment from the transmission line while RF power
is being applied. Leaking RF energy is a potential health hazard.
1. Carefully check the condition of the RF cable and connectors
used in the circuitry to the Model 6151A.
2. The RF cable lengths, adapters and connectors should be
kept to a minimum. Type N or other constant impedance
connectors and adapters should be used throughout.
3. When other than 50 ohm connectors are used, keep at the
transmitter jack only. This will keep the RF cable free from
standing waves.
Operator’s Test
for Accuracy
Zero Adjust Place the Model 6151A Termaline Wattmeter in a position where the meter can be
Figure 5
Zero Adjust
Operating checks should consist mainly of comparison between this wattmeter and
a Thruline wattmeter or other wattmeters of the same type. This will indicate an
accuracy of within ± 10 percent full scale due to the ± 5 percent full scale limits of
each instrument. Repeat the cross-check several times to eliminate possible error
from transmitter variations.
easily read while the transmitter is being adjusted. If the meter pointer does not
read zero under no-load conditions, turn the zero adjust screw (located below the
meter face) slightly to the right or left with a small screwdriver until the pointer is
exactly on the zero mark. Refer to figure 5.
Zero Adjust
7
Bird Model 6151A Termaline Wattmeter
Transmitter Power
Measuring
Use As Dummy
Antenna
WARNING
Do not attempt to operate the Termaline Wattmeter for prolonged periods at higher than
read load levels. Damage to the equipment and injury to operator may result.
The meter indicates the power dissipated in the load portion of the instrument.
Losses introduced by the cable between the transmitter and the wattmeter, if
significant, must be added to the power, indicated by the Model 6151A Wattmeter.
During the process of switching from the wattmeter back to the antenna, it may
become necessary to retune the transmitter slightly due to the difference in VSWR
between the wattmeter termination and the transmitter’s antenna.
The Model 6151A may be used, without the meter and Plug-In Element, as a 50
ohm coaxial termination load for transmitters with a power output up to 100 watts
from dc to 2.3 GHz.
To protect the meter when using as a dummy antenna, the meter can be disconnected
at the dc plug. Also turn the element so that the arrow on the identification plate
points up i.e. at 90 to direction of power flow.
The load portion will accept an overload of RF power for short periods of time as
long as sufficient time between overloading is allowed for cooling.
8
Chapter 5
Maintenance
This chapter covers the cleaning, inspection, troubleshooting, and replacement parts.
Troubleshooting
For corrections requiring repair or replacement of components, refer to the appropriate section for your specific model.
Troubleshooting
Table 1
Problem Possible Cause Remedy
Coolant oil leaking around
clamping band or radiator
housing.
Radiator overheating. Transmitter power too
High or low dc resistance
values.
Incorrect power reading. Defective element. Return element to
Clamping bands not tight. Tighten slightly with a
screwdriver.
Faulty O-Ring (front) Replace O-Ring.
Faulty diaphragm (rear) Replace diaphragm.
Reduce transmitter power.
high.
Coolant oil level too low. Add more coolant oil to
the radiator.
Accumulation of dirt on
cooling fins.
Faulty RF section
assembly.
Faulty RF connector. Replace RF connector.
Loose RF connector. Tighten with a screwdriver.
Faulty RF section
assembly.
Loose meter cable. Tighten cable connector.
Clean the fins.
Replace RF section.
Replace RF section.
authorized service facility
for replacement and
calibration.
Cleaning
Outside Surface It is necessary to keep the following areas clean:
s The outside surface of the wattmeter
s Radiator fins
s Connector
Excessive dust and lint on the cooling fins will interfere with the efficient dissipation
of heat. Periodically wipe, with a soft cloth, the accumulated dust and lint off of the
radiator fins. If the teflon insulator or metallic contact surfaces of the connector
should become dirty, wipe off with a soft cloth. Use a contact cleaner that is
self-drying and does not leave a residue on the inaccessible internal parts.
9
Bird Model 6151A Termaline Wattmeter
Inspection
Inspection will be necessary at six months intervals. Check for coolant oil seepage
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 table and
check tightness of the clamping screw and the fasteners around the front cylinder.
Preventive Maintenance
Preventive maintenance is limited to:
s Cleaning the equipment, particularly the radiator fins. It is important to main-
tain the heat transfer efficiency of the cooling fins.
s Check the coolant level in the radiator tank occasionally.
s Keep the dc plug connected to the line section and the Plug-In Element. in its
socket at all times. This will prevent dust and dirt from accumulating in the
sockets.
Do not subject the meter and Plug-In Element to rough treatment. Do not drop as
a sharp blow may damage meter or alter the ± 5 percent accuracy of the Plug-In
Element.
+ Note: When using as a termination only, point the Element arrow up or at a
right angle to the Line Section.
Disassembly
There are no special techniques required for the repair or replacement of components
in these Termaline Wattmeters.
Tools Required A screwdriver and a small wrench are the only tools needed.
There are no special techniques required for the repair or replacement of components
in these Termaline Wattmeters.
RF Connector The connector is a “Quick-Change” design which permits easy interchange with the
use of only a screwdriver. This process does not interfere with the essential coaxial
continuity of the load resistor RF input or the coolant oil seal. For replacement,
proceed as follows:
1. Remove the four 8-32 x 5/16 round head machine screws
from the corners of the RF connector.
2. Pull the connector straight out of its socket.
Diaphragm and
Coolant Oil
Remove the diaphragm to replace or examine the coolant oil. For replacement of the
diaphragm and coolant oil follow the steps below.
CAUTION
Do not replace coolant with anything but the specified fluid. The inner shell of the resistor
housing is contoured to the dielectric properties of this fluid. The use of any other type of
coolant will affect the electrical performance of the load.
10
1. Stand the load vertically, with the back end up.
2. Loosen the clamp screw until the clamp band is released.
Maintenance
3. Remove the diaphragm cover and lift the diaphragm from
the back end of the radiator tank. Inspect the diaphragm.
If it is no longer soft and pliable or shows signs of surface
cracks it should be replaced.
4. The coolant level should be about one inch below the top of
the radiator cylinder. The coolant should be a clear to a light
yellow color, if not, it may be contaminated and should be
replaced.
Assembly
RF Connector To install a new connector, reverse the disassembly procedures. Be sure that the
projecting center pin on the connector is carefully engaged and properly seated within
the mating socket of the load resistor input before pressing it home.
Diaphragm and
Coolant Oil
Sales/Repair
Facility
Proceed as follows:
1 Put the diaphragm back in place on the radiator tank.
2. Press the cuplike swelling in the center of the diaphragm
down into the tank to remove the trapped air bubble. To
allow the air to escape, pry the diaphragm away from the
edge of the tank.
3. Through the same opening add more oil, if necessary, until
the oil level is flush with the top of the tank.
4. Replace the diaphragm cover and the clamping band.
5. Tighten the clamping screw.
Customer Service
Any maintenance or service procedure beyond scope of those provided in this section
should be referred to a qualified service center.
Bird Electronic Corporation maintains complete repair and calibration facilities at
the following addresses:
U.S.A. Sales and Manufacturing
Bird Electronic Corporation
30303 Aurora Road
Cleveland (Solon), Ohio 44139-2794
Phone: (440) 248-1200
Fax: (440) 248-5426
Sales Facilities For the location of the nearest sales office, give us a call or visit our Web site at:
http://www.bird-electronic.com
11
Bird Model 6151A Termaline Wattmeter
Pan Asia Sales Office
Bird Electronic Ltd
3A Unit 6 Tyrwhitt Road
Singapore 0820
Phone: 65 299 2537
Fax: 65 299 8509
Storage
No special preparations for storage are necessary other than to cover the equipment
to keep out dust and dirt. Store these units 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 wattmeter.
Shipment
Load Resistor Wrap the RF connector with padding, and tape the padding securely in place. Pack
and brace the load in a suitable shipping container, a corrugated paper box should
suffice. It is not necessary to remove the dielectric coolant before shipping.
Meter Portion Disconnect the dc cable from the line section, and then wrap the meter with padding
and tape securely in place. The meter can be shipped in the same container as the
load portion.
Low Frequency
Line Section
If the low frequency line section is part of the equipment as an extra accessory, wrap
and tape it securely in padding before putting it in the container with the load and
meter.
Replacement Parts List
Item Qty. Description Part Number
1 1 RF Section Assy. 8130-015
2 1 Line Section Assy. 6151-006
3 1 RF Input Connector *See table
4 1 Meter Housing Assy. 6151-027
5 1 Meter 2080-002
6 1 Cable Assy. 4220-097-1
7 1 DC Plug 7500-076
8 1 Radiator Assy. 2400-053
9 4 Bumper Feet 5-049
10 1 Handle 2400-017
11 2 Clamp Band 7500-254
12 1 Diaphragm Cap 2400-050
13 1 Dielectric Coolant 5-030-1
14 1 Diaphragm 2400-015
12
*Available “QC” Type Connectors
Connector Part Number Connector Part Number
N-Female 4240-062 LT-Female 4240-018
N-Male 4240-063 LT-Male 4240-012
HN-Female 4240-268 C-Female 4240-100
HN-Male 4240-278 C-Male 4240-110
LC-Female 4240-031 UHF-Female 4240-050
LC-Male 4240-025 UHF-Male 4240-179
BNC-Female 4240-125 TNC-Female 4240-156
BNC-Male 4240-132 TNC-Male 4240-160
SMA-Female 4240-336 SC-Female 4240-090
SMA-Male 4240-334 Mini UHF-
4240-346
Female
7/8" EIA 4240-002 7/16" IEC (Plug)
4240-363
Type 169-4
1-5/8" EIA Fixed 4240-096 1-5/8" EIA
4240-208
Swivel
7/16" IEC (Jack)
Type 169-4
4240-344 Open Term.
#10-32 Nut
4240-080
Maintenance
13
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.
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