BIRD 4028A, 4421, 4028B, 4028C, 4021 Operation Manual

Thruline® RF Power Meter Model 4421

and

®

Thruline

Directional

Rf Power Sensors

4020 Series, 4027A Series,

4027F Series, and 4028 Series

Operation Manual

©Copyright 2016 by Bird Electronic Corporation

Instruction Book Part Number 920-4421 Rev W

®

Thruline

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.

WARNING

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.

WARNING

Shock Hazard

Do not attempt to remove the RF transmission line while RF power is present.

WARNING

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.

WARNING

Safety Earth Ground

An uniterruptible 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.

WARNING

Chemical Hazard

Dry cleaning solvents for cleaning parts may be potentially dangerous. Avoid

inhalation of fumes or prolonged contact with skin.

WARNING

Resuscitation

Personnel working with or near high voltages should be familiar with modern

methods of resuscitation.

WARNING

Remove Power

Observe general safety precautions. Do not open the instrument with the power on.

i

Safety Symbols

Warning notes call attention to a procedure which, if not correctly performed, could

Caution notes call attention to a procedure which, if not correctly performed, could

The caution symbol appears on the equipment indicating there is important
information in the instruction manual regarding that particular area.

Note: Calls attention to supplemental information.

Warning Statements

Safety Precautions

WARNING

result in personal injury.

CAUTION

result in damage to the instrument.

The following safety warnings appear in the text where there is danger to operating and maintenance personnel
and are repeated here for emphasis.

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.

See page 6, 34, and 43.

WARNING

To avoid personal injury, disconnect the power cord from the AC line before

performing any maintenance, including fuse replacement or changing the line voltage

setting.

See page 34, 37, 37, and 43.

WARNING

Use only Nickel Metal Hydride (NiMH) batteries that have a minimum capacity of 4500

milliampere hours (mAh). Do not install batteries that are not Nickel Metal Hydride.

Do not install NiMH batteries that have less than 4500 mAh capacity. Failure to

comply may result in damage to the batteries, damage to the instrument, and injury

to personnel from battery chemicals.

See page 39 and 40.

WARNING

Heavy load. Do not attempt to lift unaided.

See page 43.

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Thruline RF Power Meter, Model 4421

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

Changing the sensor’s connectors will invalidate calibration data, and may reduce the

maximum power rating of the unit.

See page 3, 43, 46, 48, and 52.

CAUTION

The Bird 4421 must be powered off when connecting or disconnecting the power

sensor from the power meter.

See page 6 and 43.

CAUTION

Do not use the power sensor with a load VSWR greater then 2:1. Damage to the

power meter, power sensor, or the RF power source could occur.

See page 6.

Long-term storage of this instrument can affect battery performance and reduce

battery life. Do not store the instrument for long periods of time without recharging

See page 8

During remote operation, periodically monitor the bus service request line. Failure to

See page 11 and 16.

maintenance should not be attempted. Removal or disturbance of the power sensor

See page 34 and 43.

Failure to install the properly rated fuse may result in equipment damage or nuisance

CAUTION

the batteries (refer to page 39). Failure to comply may result in reduced battery

charge and shortened battery life.

CAUTION

detect a service request could result in equipment damage.

CAUTION

Due to the complexity of the Bird Power Sensor, field repairs beyond general

cover can result in cancellation of lifetime warranty.

CAUTION

failures.

See page 37.

iii

Safety Precautions

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.

IMPRIEGO

QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO DIVERSO DA COME
SPECIFICATO DAL PRODUTTORE LA PROZIONE DI SICUREZZA POTREBBE VENIRNE
COMPROMESSA.

iv

Thruline RF Power Meter, Model 4421

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, SID 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.

v

Safety Precautions

UNITS ARE EQUIPPED WITH RECHAREABLE BATTERIES. THESE ARE TO BE REPLACED BY
AUTHORIZED SERVICE PERSONNEL ONLY!!!

LAS UNIDADES VIENEN EQUIPADAS CON BATERIAS RECARGABLES. ¡¡¡Y SOLAMENTE EL
PERSONAL DE SERVICIO AUTORIZADO PUEDE REEMPLAZARLAS!!!

GERÄTE SIND MIT WIEDER AUFLADBAREN BATTERIEN BESTÜCKT. BATTERIEN SIND NUR VON
QUALIFIZIERTEM SERICE PERSONAL AUSZUWECHSELN!!!

CES DISPOSITIFS SONT ÉQUIPÉS DE BATTERIES RECHARGEABLES. SEUL LE PERSONNEL
D’ENTRETIEN AUTORISÉ EST HABILITÉ À LES REMPLACER !

LE UNITÀ SONO DOTATE DI BATTERIE RICARICABILI, CHE DEVONO DA COME SPECIFICATO
DAL PRODUTTORE LA PROTEZIONE DI SICUREZZA POTREBBE VENIRNE COMPROMESSA.

vi

Thruline RF Power Meter, Model 4421

BE SURE THE 115/230V AC VOLTAGE SELECTOR IS SET TO THE PROPER LINE VOLTAGE, AND
THE CORRECT AC LINE FUSE IS INSTALLED BEFORE AC POWER IS APPLIED.

S’ASSURER QUE LE SÉLECTEUR DE TENSION 115/230V C.A. EST BIEN RÉGLÉ POUR LA
TENSION DU RÉSEAU ET QUE LE FUSIBLE DE LIGNE C.A. CORRECT EST EN PLACE AVANT DE
METTRE SOUS TENSION C.A.

CERCIORESE QUE EL SELECTOR DE VOLTAJE DE 115/230V CA ESTE COLOCADO A LA LINEA
DE VOLTAJE APROPIADA Y QUE EL FUSIBLE ESTE INSTALADO A LA LINEA CA ANTES DE
APLICAR LA CORRIENTE ALTERNA.

VOR EINSCHALTEN DER WECHSELSTROMZUFUHR SICHERSTELLEN, DASS DER 115/230V
WECHSELSPANNUNGS-SELEKTOR AUF DIE VORSCHRIFTSMÄSSIGE LEITUNGSSPANNUNG
EINGESTELLT UND DIE RICHTIGE WECHSELSTROM-HAUPTSICHERUNG EINGESETZT IST.

PRIMA DI EROGARE CORRENTE, ASSICURARSI CHE IL SELETTORE DI VOLTAGGIO 115/230
V.C.A. SIA REGOLATO CORRETTAMENTE E CHE IL FUSIBLE ADATTO ALLA LINEA DI
ALIMENTAZIONE C.A. SIA INSTALLATO.

vii

About This Manual

About This Manual

This manual covers the Bird 4421 RF Power Meter and the its sensors. This manual covers the operating and
maintenance instructions for the following models:

Power Meter 4421

4020 Series

Sensors

4027A Series

Sensors

4027F Series

Sensors

4028A Series

Sensors

4028B Series

Sensors

4028C Series

Sensors

4021 4022 4024 4025

4027A250K 4027A400K 4027A800K 4027A2M
4027A4M 4027A10M 4027A12M 4027A25M
4027A35M 4027A60M 4027A100M 4027A150M
4027F2M 4027F10M 4027F60M

4028A250K 4028A400K 4028A2M 4028A3M
4028A4M 4028A10M 4028A25M

4028B10M 4028B3M

4028C10M

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.

Contents

Chapter Layout

Introduction — Describes the purpose and function of the Power Meter as well as a general overview of the

product.

Installation — Describes the installation instructions for the power meter models covered in this manual.
Operating Instructions — Describes the features of the power meters and provides power-up instructions.
IEEE-488 GPIB Interface — Describes the features of the IEEE-488 GPIB Interface.
RS-232 Interface — Describes the features of the RS-232 Interface.
Maintenance — Contains preventative maintenance information, troubleshooting and repair sections, and a list

of replacement parts with part numbers.

viii

Table of Contents

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .i

Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii

Warning Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii

Caution Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Safety Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viii

Changes to this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii

Chapter Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii

Chapter 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Items Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Power Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

4020 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

4027A Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

4027F Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

4028 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Frequency and Power Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4020 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4027A Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4027F Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

4028 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Chapter 2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Sensor Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

RF Line Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Panel Mounting the 4421 Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Handle Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

115/230V AC Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

AC Line Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Chapter 3 Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Push Button Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Audible Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Chapter 4 IEEE-488 GPIB Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Cable Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Interface Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Dip Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Talker-Only Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Command Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

General Bus Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Device Dependent Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

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Table of Contents

Chapter 5 RS-232 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Cable Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

DIP Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Auto Baud . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Talker-Only Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Command Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

General Bus Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Device Dependent Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Chapter 6 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Functional Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Push Button Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Power Meter Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Replacing Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Replacing Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Replace Batteries (Older models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Replace Batteries (Newer Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Long Term Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Cal Cart Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

Front Panel (Cal Cart only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Cord Reel (Cal Cart only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Power Sensor (Cal Cart only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

Casters (Cal Cart only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Handle (Cal Cart only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Storage and Shipment (Cal Cart only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Specifications, Cal Cart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Max. Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

Specifications, 4421 RF Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Specifications, Power Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Specifications, RS-232 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Specifications, IEEE-488 GPIB Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Available Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

x

Chapter 1 Introduction

Power Meter

The Bird 4421 RF Power Meter is one component of a complete RF power measurement system. An RF power
sensor such as a Bird 4021 is also required. The system can be controlled with the front panel buttons, or remotely
through an RS-232 connection or a GPIB-488 connection. See

Items Supplied

 Bird 4421 RF Power Meter
 AC Power Cord
 Sensor Cable
 Instruction Manual

Optional Accessories

Panel Mount Kit (P/N 4421-250) — Allows the Bird 4421 to be installed in a standard 19" panel for rack mount

applications.

Null Modem Kit (P/N 4380-250) — Contains the hardware necessary to allow the 4421 to be remotely

controlled by controllers with different wiring arrangements. Requires an RS-232 interface module.

Figure 1 on page 2

.

1

Figure 1 Bird 4421 Meter Outline Drawing

Introduction

1. Operating Push Buttons

2. LCD

3. ON/OFF Push Button

4. Handle

5. Central Button

6. Fuse Access Door

7. AC Line Module

8. Master ON/OFF Switch

9. GPIB connector

10. GPIB DIP switches

* A shorter case was introduced in 2016,
4421 length dimension has changed for
models built in 2016 and later.

11. RS-232 connector

12. RS-232 DIP switches

13. Power Sensor Socket

2

Thruline RF Power Meter, Model 4421

Power Sensors

Power sensors are available with a variety of connectors; see
complete list. Since the accuracy is critically dependent on the connectors used at calibration, do not remove or
change the connectors.

Changing the sensor’s connectors will invalidate calibration data, and may reduce the

maximum power rating of the unit.

4020 Series

Bird 4020 Series Power Sensors are designed for lab or field use and are accurate to within ± 3%(1) of reading.

4027A Series

Bird 4027A Series Power Sensors are designed for use in semiconductor processing and calibration applications.
Stringent calibration provides long-term unit-to-unit repeatability, allowing consistent amounts of RF energy to be
applied to the etch process over many etch cycles. 4027A Sensors are accurate to ± 1%(1) at specified calibration
frequencies and power levels.

4027F Series

Bird 4027F Series Power Sensors are similar to the 4027A series. However, additional filtering allows the 4027F to
ignore harmonics of the signal being measured. The 4027F is also less sensitive to AM components of the signal.
4027F Sensors are accurate to ± 1%(2) at specified calibration frequencies and power levels.

"Available Connectors" on page 52

CAUTION

for a

Figure 2 Power Sensor Outline Drawing, 4020, 4027A, 4027F, & 4028A Series

4028 Series

Bird 4028 Series Power Sensors are high power sensors otherwise similar to the 4027A series. 4028A sensors are
based on a 7/8” line, 4028B sensors use a 1-5/8” line, and 4028C sensors use a 3-1/8” line. 4028 Sensors are
accurate to ± 2% at specified calibration frequencies and power levels.

3

Figure 3 Power Sensor Outline Drawing 4028B Series only

Figure 4 Power Sensor Outline Drawing 4028C Series only

Introduction

Frequency and Power Ranges

4020 Series

Model Frequency Range RF Power Range

4021 1.8 – 32 MHz 300 mW – 1 kW
4022 25 – 1000 MHz 300 mW – 1 kW
4024 1.5 – 32 MHz 3 W – 10 kW
4025 100 kHz – 2.5 MHz 3 W – 10 kW

4

Thruline RF Power Meter, Model 4421

4027A Series

Model Frequency Range RF Power Range

4027A250K 250 – 400 kHz 3 W – 10 kW
4027A400K 400 – 550 kHz 3 W – 10 kW
4027A800K 800 – 950 kHz 3 W – 10 kW
4027A2M 1.5 – 2.5 MHz 3 W – 10 kW
4027A4M 3 – 5 MHz 3 W – 10 kW
4027A10M 10 – 15 MHz 3 W – 10 kW
4027A12M 10 – 15 MHz 300 mW – 1 kW
4027A25M 25 – 30 MHz 3 W – 9 kW
4027A35M 35 – 45 MHz 3 W – 7.5 kW
4027A60M 45 – 65 MHz 3 W – 6 kW
4027A100M 95 – 105 MHz 3 W – 4 kW
4027A150M 150 – 170 MHz 3.75 W – 3.75kW

4027F Series

4028 Series

Model Frequency Range RF Power Range

4027F2M 1.8 – 2.2 MHz 100 W – 10 kW
4027F10M 12 – 15 MHz 3 W – 4 kW
4027F60M 57 – 63 MHz 3.75 W – 3.75 kW

Model Frequency Range RF Power Range

4028A250K 250 – 400 kHz 1 kW – 20 kW
4028A400K 400 – 550 kHz 1 kW – 20 kW
4028A2M 1.5 – 2.5 MHz 1 kW – 25 kW
4028A3M 2.5 – 3.5 MHz 1 kW – 25 kW
4028A4M 3.5 – 4.5 MHz 1 kW – 25 kW
4028A10M 10 – 15 MHz 1 kW – 25 kW
4028A25M 25 – 30 MHz 1 kW – 25 kW
4028B3M 2.5 – 4 MHz 1 kW – 25 kW
4028B10M 10 – 15 MHz 1 kW – 25 kW
4028C10M 10 – 15 MHz 500W – 50 kW

5

Chapter 2 Installation

This chapter provides information about preparing the Bird 4421 for use.

Sensor Connection

CAUTION

Changing the sensor’s connectors will invalidate calibration data, and may reduce the

maximum power rating of the unit.

CAUTION

The Bird 4421 must be powered off when connecting or disconnecting the power

sensor from the power meter.

1. Turn OFF the ON/OFF rocker switch on the meter’s rear panel.

2. Align the latch on the cable with the notch of the “Power Sensor” socket on the power meter’s rear panel.

3. Insert the cable until it clicks into place.

4. Connect the other end of the sensor cable to the sensor.

RF Line Connection

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

Do not use the power sensor with a load VSWR greater then 2:1. Damage to the power

meter, power sensor, or the RF power source could occur.

Connect the end of the power sensor labeled “SOURCE” to the RF source. Connect the end labeled “LOAD” to the
load or antenna. Reversing these connections will cause measurement errors.

Panel Mounting the 4421 Power Meter

You can install the 4421 Power Meter in an equipment rack if you have the optional panel mount kit (refer to

"Optional Accessories" on page 1
on page 7

kit.

shows the overall dimensions and mounting points for a 4421 Power Meter installed in a panel mount

Note: The power supply interrupt switch for the 4421 Power Meter is located on the rear panel. When
you install a unit in a panel mount kit, you need to provide a means to interrupt the power supply that
is easily accessible to the user (such as a switch mounted in the panel).

). The panel mount kit includes complete installation instructions.

Figure 5

6

Thruline RF Power Meter, Model 4421

Figure 5 Panel Mounting Dimensions

Handle Operation

The handle on the Bird 4421 can be set to four different positions (see
center buttons on both sides. Releasing the buttons will lock the handle into position.

Figure 6 Handle Positions

7

Figure 6

). To adjust the handle, press the

Installation

115/230V AC Input Power

The internal power supply can operate at 115 VAC or 230 VAC. There is no user setting to select the input voltage
because the power supply automatically senses the input voltage. However, you must make sure that you have the
correct power cord plug and fuses installed for the line voltage you are using (refer to

page 37

AC Line Connectors

To make the AC line cord compatible with non-U.S. voltages, users must install the appropriate connector on the
power cord.

).

"Replacing Fuses" on

Batteries

The Bird 4421 RF Power Meter is completely portable and is powered from internal rechargeable nickel metal
hydride batteries.

The batteries are shipped in a low charge state. It is, therefore, recommended that you charge the instrument for
approximately 28 hours before using it for continuous operation.

Note: Battery charging at temperatures greater than 45° C (113° F) can result in reduced operational
time.

CAUTION

Long-term storage of this instrument can affect battery performance and reduce

battery life. Do not store the instrument for long periods of time without recharging

the batteries (refer to page 39). Failure to comply may result in reduced battery

charge and shortened battery life.

8

Chapter 3 Operating Instructions

This chapter describes operator controls and indicators on the Bird 4421 RF Power Meter. For remote operation
using a IEEE-488 (GPIB) or RS-232 controller, refer to the instructions in

Push Button Functions

Figure 7 Push Buttons

Push Button Description

FWD, RFL

SWR

MIN, MAX

dBm

LIGHT

AUTO

UP, DOWN

ON/OFF

Press to measure forward or reflected RF power. FWD or RFL
indicator and current unit of measure turn on.

Press to measure standing wave ratio. SWR indicator turns on. Value
displayed will be between 1.0 and 199.9

Used after pressing FWD, RFL, SWR, or dBm. Displays the minimum
(maximum) measured value of the previous function as long as MIN
(MAX) is held down.

Used after pressing FWD or RFL. dBm indicator turns on. Power is
displayed in dBm units.

Note: Used after pressing SWR. Return loss is dis­played.

Press to turn on or turn off the display’s backlight. If left on, the light
automatically shuts off after 30 minutes.

Press to automatically set the scale. AUTO turns on.
Press to select the next higher (lower) scale. If the scale is too high

for the power sensor, an error will be displayed.

Note: Used while AUTO indicator is on. Stops auto­matic scaling. AUTO indicator turns off.

Press to turn the power meter on or off. This switch will not work if
the master power switch on the rear panel is OFF.

Note: The display flashes for about 30 seconds when
the unit is first turned on.

Chapter 4

or

Chapter 5

respectively.

9

Operating Instructions

Error Codes

The Bird 4421 displays error codes when the RF power is either below the selected range (underrange) or above the
selected range (overrange).

Table 1 Error Codes

Table 2 Function Limits

FWD, RFL

FWD dBm, RFL dBm

SWR

Return Loss

Table 1

Symbol Explanation

Function Limit Error

displays the error codes and

Value greater than overrange limit of function

Value less than underrange limit of function

Power > 199.9 % of full scale or 120 % of
top range

Power > 120 % of full scale Overrange
Power < 3 % of low range Underrange
FWD < 20 % of low range Underrange
FWD – RFL = 0 Overrange
FWD < 20 % of low range Underrange
RFL < 20 % of low range Underrange
Return Loss > 40 dB Underrange

Table 2

lists the function limits.

Overrange

Audible Warning

If the RF power level exceeds 120 % of the power sensor’s maximum power capability, the power meter will sound a
warning buzzer.

10

Chapter 4 IEEE-488 GPIB Interface

This chapter discusses setup of the IEEE-488 interface feature and describes the IEEE commands that apply to the
Bird 4421. Operators should understand IEEE standard 488-1978 and have basic computer programming skills
before attempting to write any programs.

CAUTION

During remote operation, periodically monitor the bus

service request line. Failure to detect a service request

could result in equipment damage.

Description

The Bird 4421 IEEE-488 (GPIB) interface has an eight-position DIP switch that sets operational conditions and
interface addresses. The bottom line of the display indicates the current bus status.

Cable Connector

The interface uses a standard IEEE-488 cable connector. Pin assignments are listed in

Table 3 IEEE-488 Pin Assignments

Pin Designation Type

1 D101 Data
2 D102 Data
3 D103 Data
4 D104 Data
5 EOI Management
6 DAV Handshake
7 NRFD Handshake
8 NDAC Handshake

9 IFC Management
10 SRQ Management
11 ATN Management
12 SHIELD Ground
13 D105 Data
14 D106 Data
15 D107 Data
16 D108 Data
17 REN Management
18 GROUND Ground
19 GROUND Ground
20 GROUND Ground
21 GROUND Ground
22 GROUND Ground
23 GROUND Ground
24 GROUND, LOGIC Ground

Table 3

.

11

Interface Capabilities

Table 4 IEEE-488 Interface Module Capabilities

Code Name Description

SH1

Source Handshake

AH1

Acceptor

Can handshake data or command bytes when the unit is
acting as a source.

Can handshake the bus when it is acting as the acceptor of
data or commands.

Can send data over the bus to other devices. This capability

T5

Talker

exists only after the instrument has been addressed to talk,
or after a reading in talk-only mode.

Can receive device-dependent data over the bus. This

L4

Listener

capability exists only after the unit has been addressed to
listen.

SR1

Service Request Can request service from the controller.

RL1

Remote-Local Can be placed in remote or local mode.

PP0

Parallel Poll Does not have parallel polling capability.

DC1

Device Clear Can be reset to factory settings.

DT1

Device Trigger Can have its readings triggered.

C0

Controller Does not have controller capability.

E1

Bus Driver Type Has open-collector bus drivers.

TE0

Extended Talker Does not have extended talker capability.

LE0

Extended Listener Does not have extended listener capability.

IEEE-488 GPIB Interface

Indicators

The bottom line of the power meter’s display shows indicators describing the status of the Bird 4421 when used
with the IEEE interface. These are:

REMOTE — When REMOTE is displayed, the power meter is being controlled through the interface.

Measurements, units of measure, and certain other parameters may be changed from a remote location.

LISTEN — When LISTEN is displayed, the power meter is receiving data.
TALK — When TALK is displayed, the power meter is transmitting data. This is always shown when the unit is in

“talker-only” mode.

LOCAL LOCKOUT — When LOCAL LOCKOUT is displayed, the push buttons are disabled and the power meter’s

functions are being remotely controlled.

Setup

Dip Switch

Set the interface to ADDR (Addressable) by positioning DIP switch 1 to ON. This makes the 4421 respond to
controller commands.

Note: There are several button styles on DIP switches (slide, rocker, lever). Examine the DIP switch to
determine the ON and OFF positions.

Set the primary address using the DIP switches. The primary address is factory set to 6, but can be set to any value
between 1 and 31 (0 is reserved for the controller) To set the primary address, turn OFF switches 4 – 8 so that the
sum of the bits turned off equals the desired primary address. In
off switches have values of 4 and 2).

Figure 8 on page 13

, the address is set to 6 (the

12

Thruline RF Power Meter, Model 4421

Figure 8 IEEE Interface Default DIP Switch Settings

Note: The primary address is used by the control­ler to refer to specific devices on the bus. When
programming the controller, the address in the
program must be the same as the address set on
the interface module. Each device on the bus must
have a different primary address.

Talker-Only Mode

The Bird 4421 can be set up for manual operation while automatically sending data to an output device (Talker-Only
Mode). To do so, turn DIP switch 1 OFF and cycle the power. TALK will be displayed.

In Talker-Only mode, pressing a button on the meter triggers a measurement. When the measurement is complete,
the information is sent to the bus and LISTEN turns on momentarily. A listen-only device on the bus, such as a
printer, can read the value. The power meter is then ready to accept another button press.

Command Syntax

The Bird 4421 accepts two types of commands. General bus commands are commands, such as Device Clear (DCL),
that apply to any IEEE interfaced device. Device-dependent commands are specific to the 4421.

If an invalid command is sent to the unit, an error condition is placed in the serial poll byte and the offending
command is not executed.

A group of device-dependent commands can be sent as a single string as long as like command categories are not
repeated, for example: “PNFCFDT3TRG”. This string sets up the 4421 to send no prefixes, read forward dBm, make
one reading on “TRG”, and triggers a measurement.

Note: Commands can be entered in either upper or lower case.
Note: Only the last command entered of each category will be executed. As a command string is pro-

cessed by the 4421, each category of command is stored in a separate location. Two commands of the
same category will be stored in the same location, so that the second will overwrite and erase the first
one.

General Bus Commands

The general bus commands supported by the IEEE-488 interface feature are listed in
executing general commands varies among controllers; check the documentation supplied with your controller for
the proper command structure.

Table 5 IEEE-488 General Bus Commands

Command Effect on Bird 4421

IDN? Gives product identification

REN Goes into remote mode when next addressed

GTL Cancels remote mode, restores local operation

LLO Locks out local operation

IFC Goes into talker and listener-idle status

DCL Returns to default conditions

SDC Returns to default conditions

GET Triggers reading in T2 and T3 modes

SPE, SPD Puts the status byte on the bus

13

Table 5

. The syntax for

IDentificatioN (IDN?)

IEEE-488 GPIB Interface

Function
Remarks

Product identifies itself

Replies command same as U2

Remote ENable (REN)

Function
Remarks

Enables remote operation.

The unit must be addressed to listen after setting REN true.

The REMOTE indicator turns on when this command is received.

Go To Local (GTL)

Function
Remarks

Returns device to local operation.

Issuing a GTL command while the device is in Local Lockout mode does not clear the
lockout condition.

The REMOTE indicator turns off.

The LISTEN indicator remains on.

Local LOckout (LLO)

Function
Remarks

Disables local operation of all devices on the bus.

REN must be true to use LLO.

LLO is cleared by setting REN false.

InterFace Clear (IFC)

Function
Remarks

Terminates all bus activity and passes control to the system controller.

All devices are set to talker and listener idle states.

LISTEN mode is canceled, and its indicator is turned off.

14

Thruline RF Power Meter, Model 4421

Device CLear (DCL)

Function
Remarks

Table 6 IEEE-488 Default Conditions

F

Auto Range ON RYY

Two Terminators (CR LF) YT

Prefixes YES PY

Trigger One Shot on Talk Address T1

All SRQ’s OFF M00

Send EOI with last byte of message KY

Resets the status of all devices to an initialized state.

Does not change the current interface mode.

The 4421 returns to the factory default condition listed in

Default Condition Related Command

orward Carrier Wave FC

Selective Device Clear (SDC)

Function
Remarks

Resets the status of a selected device to an initialized state.

Only the device addressed will be cleared.

The 4421 returns to the factory default condition.

Table 6

.

Group Execute Trigger (GET)

Function
Remarks

15

Initiates a measurement for all devices set to trigger on GET.

The 4421 must be already set to trigger on GET.

Used to synchronize measurements of multiple instruments.

Serial Polling Enable/Disable (SPE/SPD)

IEEE-488 GPIB Interface

Function

Enables or disables the serial polling sequence.

During remote operation, periodically monitor the bus service request line. Failure to

detect a service request could result in equipment damage.

Remarks

The SPE command puts all devices in serial poll mode waiting to be addressed.
The SPD command clears the SRQ bit (bit 6) and ends the polling sequence.

When addressed a device sends its status byte to the controller. A value of 1 for a bit
means tha

t the device condition that bit refers to is true. A value of 0 means that the

condition is false.
The 4421 does not use all bits of the status byte.

a description and how to reset them.

Table 7 IEEE Status Byte Description

Bit Name Condition

Set if a service request is generated by the 4421. If an SRQ
has been received by the controller and this bit is cleared,

6

SRQ

other instruments on the bus should be checked to
determine where the SRQ occurred.

Cleared by a serial poll of the 4421.

Measurement

3

Complete

Set when the power meter has completed a reading.
Cleared by requesting a reading over the bus.
Set when the RF power is underrange and a reading has

2

Reading Underflow

been completed.
Cleared by requesting a reading over the bus.
Set when the RF power is overrange and a reading has been

1

Reading Overflow

completed.
Cleared by requesting a reading over the bus.
Set if an illegal device-dependent command (IDDC) or illegal

device-dependent command option (IDDCO) was received,

0

Error

or if the power meter fails the self test.
Cleared by reading the U1 status word. The U1 word

contains details on the error, see

page 21

CAUTION

.

Table 7

lists the bits used, along with

"Status (Ux)" on

16

Thruline RF Power Meter, Model 4421

Device Dependent Commands

The device-dependent commands used by the 4421 Power Meter are listed in

Note: The programming card also has a complete command list.

Table 8 IEEE-488 Device Dependent Command Summary

Category Command Description

FC Forward carrier wave

FD Forward dBm

RC Reflected carrier wave

Measurement

Range

Terminators

Prefixes

Triggers

Serial Polling

Status

Self-Test J0 Run self-test

EOI Response

Writable Store WXXXXXX Place XXXXXX in RAM

RD Reflected dBm

SW Standing wave ratio

RL Return loss

MN Minimum value

MX Maximum value

RYY Auto range on

R00 to R17 Manual ranges

RNN Auto range off, stay at present range

YT Two terminators: CR, LF

YO One terminator: CR

YN No terminator

PY Prefix YES

PN Prefix NO

T0 Continuous on TALK

T1 One shot on TALK

T2 Continuous on GET

T3 One shot on GET

T4 Continuous on measurement command

T5 One shot on measurement command

M00 Do not generate SRQ

M01 Generate SRQ on error

M02 Generate SRQ on measurement overrange

M04 Generate SRQ on measurement underrange

M08 Generate SRQ on operation complete

U0 Send back current machine state

U1 Send back error conditions

U2 Send back revision levels

KY Send EOI on last byte

KN Do not send EOI on last byte

Table 8

, organized by category.

17

Forward Carrier Wave (FC)
Forward dBm (FD)
Reflected Carrier W

ave (RC)

Reflected dBm (RD)

IEEE-488 GPIB Interface

Function
Remarks

Selects forward or reflected RF power measurement mode.

Measurement results are returned in Watts or dBm.

Standing Wave Ratio (SW)
Return Loss (RL)

Function
Remarks

Selects SWR or return loss match measurement mode.

Measurement results are returned in VSWR or dB.

MiNimum Value (MN)
MaXimum Value (MX)

Function
Remarks

Selects minimum or maximum measurement mode.

Another measurement must be selected before selecting min or max.

Returns the minimum (or maximum) value of the previous measurement type.

18

Thruline RF Power Meter, Model 4421

Range (Rxx)

Function
Remarks

Selects a measurement range listed in

If the selected range is outside the range of the connected power sensor, the command
is ignored.

Table 9 Measurement Ranges

Command Power Range

RYY
RNN

R17
R16
R15
R14
R13
R12
R11
R10
R09
R08
R07
R06
R05
R04
R03
R02
R01
R00

Table 9

.

Turn auto range on
Turn auto range off. Keep present range

18.0 – 199.9 MW

1.80 – 19.99 MW

0.180 – 1.999 MW

18.0 – 199.9 kW

1.80 – 19.99 kW

0.180 – 1.999 kW

18.0 – 199.9 W

1.80 – 19.99 W

0.180 – 1.999 W

18.0 – 199.9 mW

1.80 – 19.99 mW

0.180 – 1.999 mW

18.0 – 199.9 μW

1.80 – 19.99 μW

0.180 – 1.999 μW

18.0 – 199.9 nW

1.80 – 19.99 nW

0.180 – 1.999 nW

Terminators (Yx)

Function

Selects the characters that follow the end of a data string. Set x to:

 “T” for two terminators; a carriage return (CR) and a line feed (LF).
 “O” for one terminator; a carriage return (CR).

“N” for no terminator; message can be terminated by EOI.

Remarks

19

Many controllers use the terminator sequence to recognize the end of an input string.
Using incorrect terminators can lock the bus.

Prefixes (Px)

IEEE-488 GPIB Interface

Function

Turns the prefix mode on or off. Set x to:

 “Y” to enable prefixes.
 “N” to disable prefixes.

Remarks

Prefixes are sent over the bus with the measurement, and indicate the status of the current
measurement (see

 “FC”,”FD”,”RC”,”RD”,”SW”,”RL”,”MN”,”MX” indicates the measurement type.
 “U” indicates underflow; the value sent is “.000”.
 “O” indicates overflow; the value sent is “199.9”.
 “N” indicates normal; the value sent is a normal on-scale reading.
 “4421” indicates the Bird model number.

Table 10 Prefix Examples

Data String Description

NFC.0.123W(CR)(LF) Normal (N) forward carrier wave (FC), prefixes on

OFC 199.9W(CR)(LF) Overflowed (O) forward carrier wave (FC), prefixes on

199.9W(CR)(LF) Overflowed forward carrier wave, prefixes off

URD .000W(CR)(LF) Underflowed (U) reflected dBm (RD), prefixes on

Table 10

for examples):

Triggers (Tx)

Function
Remarks

Table 11 Trigger Conditions

Selects the condition which will trigger a reading (see

Failure to trigger device before requesting a reading will lock the bus.

T1 halts the bus until a reading is available.

T0 and T1 do not set the measurement complete SRQ.

T2, T3, T4, and T5 set a SRQ when the measurement is complete.

Fastest reading rate is 2.4 readings/second; slowest is 1 reading/sec.

Command Trigger Condition

T0
T1
T2
T3

T4

T5

Table 11

Continuous on talk

One shot on talk

Continuous on GET

One shot on GET

Continuous on measurement command (FC,FD,
RC, RD, SW, RL, MN, MX)

One shot on measurement command (FC, FD,
RC, RD, SW, RL, MN, MX)

).

20

Thruline RF Power Meter, Model 4421

SRQ Mask (Mxx)

Function

Remarks

Table 12 SRQ Mask Bits

Selectively masks status bits to prevent unwanted service requests.

Set xx to the sum of the binary values of the desired SRQ trigger bits.
For example, M12 would set the SRQ for both operation complete and underrange

alues 8 and 4). Set xx to “00” to never generate an SRQ.

(v
If a status bit is masked (bit set to 0), SRQs won’t be generated for that condition.

Binary Value Bit Number Message

1 0 (LSB)
21
42
83

Status (Ux)

4
5
6

7 (MSB)

Error (IDDC, IDDCO, self-test fail)
Measurement overrange
Measurement underrange
Operation complete
Not Used
Not Used
Can’t mask
Not Used

Function

Reads a status word and returns the information as a string. Set x to:

 “0” for machine status.
 “1” for error status.
 “2” for revision history.

Remarks

Figure 9 Machine Status Word Format

After sending the status command, a status word is sent the next time the unit is
addressed to talk. To ensure the correct status is transmitted, the status word should be
requested as soon as possible after the command is sent.

Machine Status Word (U0) —

Figure 9

. The default values are also shown.

The format of the machine status word is shown in

21

Error Status Word (U1) — The format of the error status word and the possible

error messages are shown in
in the status (serial poll) byte, and a SRQ may be generated (

on page 21

). All flags will revert to their non-error states after the U1 command is

sent.

Figure 10 Error Status Word Format

Status Meaning Description

ICM Invalid Command Set when an illegal device-dependent command

VCM Valid Command Set when no IDDC is received.
ICO Invalid Command Option Set when an illegal device-dependent command

VCO Valid Command Option Set when no IDDCO is received.
PS Self-Test Pass Set when a self-test has been initiated by the

FL Self-Test Fail Set when the self-test has failed. (This is the

IEEE-488 GPIB Interface

Figure 10

. When an error occurs, an error is also flagged

"SRQ Mask (Mxx)"

(IDDC) such as V2 is received. (V is illegal)

option (IDDCO) such as T6 is received. (6 is illegal)

J0 command and the test result is acceptable.

default condition.)

Revision History Word (U2) — The format of the revision history word is shown in

Figure 11

.

Figure 11 Revision History Word Format

Note: If Writable stores parameter has not been set, this command responds only with -4420-.

22

Thruline RF Power Meter, Model 4421

Self Test (J0)

Function
Remarks

Initiates a hardware and software test.

Results are stored in the U1 status word (

“J0” must be sent each time before reading the result.

End Or Identify (Kx)

Function

Enables or disables the End or Identify (EOI) signal. Set x to:

 “Y” to enable.
 “N” to disable.

Remarks

Writable Store (W x x x x x x)

Function
Remarks

Disabling EOI can cause some controllers to lock unless another terminator is used.

When enabled, EOI is only asserted at the end of a multiple byte string.

Storage for six bytes of ASCII data.

Data stored is lost when the 4421 is turned off.

Data is sent back as part of the U2 status word.

"Status (Ux)" on page 21

).

23

Chapter 5 RS-232 Interface

This chapter discusses setup of the RS-232 interface feature and describes the RS-232 commands that apply to the
Bird 4421. Operators should understand EIA Standard RS-232-C and have basic computer programming skills before
writing any programs.

Description

The Bird 4421 RS-232 interface feature is an integral part of the I/O hub circuit board inside of the mm21. An eight­position DIP switch is used to set operational conditions such as baud rate, parity, and stop bits. The bottom line of
the display indicates the current bus status.

Cable Connector

The interface uses a standard 25-pin RS-232 connector. Pin assignments are listed in
uses a different wiring arrangement, do not attempt to rewire the interface module’s connector. A null modem kit
should be used for rewiring instead.

Table 13 RS-232 Pin Assignments

Pin Designation Notes

1 Protection Ground Chassis Ground

2 Transmit Data

3 Receive Data

4 Request to Send (Output) Set true after module power up

5 Clear to Send

6 Data Set Ready (Input) Set internally true by module

7 Signal Ground Return path for data and control signals

8 Receive Signal DET (Input) Set true by module

20 Data Terminal Ready (Output) Set true after module power up

Indicators

(Input) Set by input device. When true, it enables the
module to transmit. When false, it disables transmission.

Table 13

. If the controller

The bottom line of the power meter’s display shows indicators describing the status of the Bird 4421 when used
with the RS-232 interface. These are:

TALK — When TALK is displayed, the power meter is transmitting data. This is always shown when the unit is in

“talker-only” mode.

LISTEN — When LISTEN is displayed, the power meter is receiving data.

24

Thruline RF Power Meter, Model 4421

Setup

DIP Switch

Set the DIP switches according to application needs and the requirements of the controller. Available settings and
factory defaults are listed in

Note: There are several button styles on DIP switches (slide, rocker, lever). Examine the DIP switch to
determine the ON and OFF positions.

Figure 12 RS-232 Interface Default DIP Switch Settings

Note: If you change switch settings when the unit is ON, the new settings will not become effective
until power is turned OFF and then back ON.

Switch Function Description

1 Stop Bit

2 Command Mode

3 Word Length

4,5 Parity

6,7,8 Baud Rate

Figure 12

.

ON
OFF

ON

OFF

ON
OFF

(4)
ON
ON
OFF
OFF

(6)
ON
ON
ON
OFF
OFF
OFF
OFF

1 Stop Bit
2 Stop Bits

†

ENT command needed before sending reading to controller†
Trigger automatically sends reading
Reading also sent when front panel push button pressed

8 Data Bits†
7 Data Bits

(5)
ON
OFF
ON
OFF

(7)
ON

OFF
OFF
ON
ON
OFF
OFF

No Parity†
Odd Parity
Even Parity
Mark Parity

(8)
ON
ON
OFF
ON
OFF
ON
OFF

Auto Baud††

300
600
1200

2400†
4800
9600

† Default factory setting
†† For more information see “Auto Baud”

25

RS-232 Interface

Auto Baud

Auto Baud is used to automatically determine the correct transmission rate. After setting DIP switches 1 through 5,
follow the steps below to use auto baud:

1. Set DIP switches 6, 7, and 8 to ON.

2. Connect a controller to the power meter.

3. Turn the power meter on.

4. Send the character U (hexadecimal 55) from the controller to the power meter.

5. Wait 1 second.

6. If the power meter’s front panel displays LISTEN, the baud rate has been determined. If not, repeat steps 4 and

5.

If, after 30 seconds, the module cannot absolutely determine a baud rate, it will choose a rate based on data
acquired during the test.

Note: Auto Baud is the only automatically chosen setting. Other items such as parity and stop bits
must be manually selected.

Talker-Only Mode

The Bird 4421 can be set up for manual operation while automatically sending data to an output device (Talker-Only
Mode). To do so, turn DIP switch 2 OFF and cycle the power. TALK will be displayed.

In Talker-Only mode, pressing a button on the meter triggers a measurement. When the measurement is complete,
the information is sent to the bus.

Command Syntax

The Bird 4421 accepts two types of commands. General bus commands are commands, such as Initialize (INT), that
apply to any RS-232 interfaced device. Device-dependent commands are specific to the 4421.

If an invalid command is sent to the unit, an error condition is placed in the serial poll byte and the offending
command is not executed.

A group of device-dependent commands can be sent as a single string as long as like command categories are not
repeated. For example: “PNFCFDT3TRG”. This string sets up the 4421 to send no prefixes, read forward dBm, make
one reading on “TRG”, and triggers a measurement.

Note: Commands can be entered in either upper or lower case.
Note: Only the last command entered of each category will be executed. As a command string is pro-

cessed by the 4421, each category of command is stored in a separate location. Two commands of the
same category will be stored in the same location, so that the second will overwrite and erase the first
one.

General Bus Commands

The general bus commands supported by the RS-232 interface module are listed in

Table 14 RS-232 General Bus Commands

Command Effect on Bird 4421

INT
ENT
TRG

B1 to B7

XO/XF

Returns to default conditions
Sends a reading to the controller
Triggers reading in T3 mode
Selects a baud rate
Enables/disables software handshake

Table 14

.

26

Thruline RF Power Meter, Model 4421

INiTialize (INT)

Function
Remarks

Resets the Bird 4421 and returns it to the factory defaults.

If INT is linked with any other command within a string, it must be separated from that
command by a space.

ENTer (ENT)

Function
Remarks

Makes the power meter transmit a reading to the controller.

A measurement must have already been triggered, placing a reading in the output
buffer.

To send a reading whenever a measurement is triggered, set DIP switch 2 to OFF. The
ENT c

TRiGger (TRG)

Function

Initiates a measurement if the power meter is in trigger mode (T3).

Baud Select (Bx)

Function
Remarks

Selects a baud rate listed in

When the meter recognizes a valid Bx command, its baud rate is immediately changed.
(The controller is assumed to be transmitting at the new rate; otherwise sending
commands would not be possible.)

This command overrides the DIP switch setting.

ommand will not need to be sent.

Table 15

.

Table 15 Baud Rates

27

Command Baud Rate

B2 300
B3 600
B4 1200
B5 2400
B6 4800
B7 9600

Xmission Flow Control (XO/XF)

RS-232 Interface

Function

Enables or disables the XON/XOFF flow control.

 XO enables flow control.
 XF disables flow control.

Remarks

Device Dependent Commands

The device-dependent commands used by the 4421 Power Meter are listed in

Table 16 RS-232 Device Dependent Command Summary

Category Command Description

Measurement

Range

Terminators

Prefixes

Triggers

Status

Self-Test
Writable Store

When data is being sent from the power meter to the computer and flow control is
enabled, data transmission will be suspended when the XOFF character (hexadecimal

13) is sent by the computer. Transmission will resume when XON (hex 11) is sent by the
computer.

When data is being sent from the computer to the power meter, XOFF will be sent to

omputer when the input buffer fills up. XON will be sent to the computer when the

the c
buffer has emptied.

FC Forward carrier wave
FD Forward dBm
RC Reflected carrier wave
RD Reflected dBm
SW Standing wave ratio
RL Return loss
MN Minimum value
MX Maximum value
RYY Auto range on
R00 to R17 Manual ranges
RNN Auto range off, stay at present range
YT Two terminators: CR, LF
YO One terminator: CR
YN No terminator
PY Prefix YES
PN Prefix NO
T0 Continuous on ENT
T1 One shot on ENT
T3 One shot on TRG
T5 One shot on measurement command
U0 Send back current machine state
U1 Send back error conditions
U2 Send back revision levels
J0 Run self-test
WXXXXXX Place XXXXXX in RAM

Table 16

, organized by category.

28

Thruline RF Power Meter, Model 4421

Forward Carrier Wave (FC)
Forward dBm (FD)
Reflected Carrier W

ave (RC)

Reflected dBm (RD)

Function
Remarks

Selects forward or reflected RF power measurement mode.

Measurement results are returned in Watts or dBm.

Standing Wave Ratio (SW)
Return Loss (RL)

Function
Remarks

Selects SWR or return loss match measurement mode.

Measurement results are returned in VSWR or dB.

MiNimum Value (MN)
MaXimum Value (MX)

Function
Remarks

Selects minimum or maximum measurement mode.

Another measurement must be selected before selecting min or max.

Returns the minimum (or maximum) value of the previous measurement type.

29

Range (Rxx)

RS-232 Interface

Function
Remarks

Selects a measurement range listed in

If the selected range is outside the range of the connected power sensor, the command
is ignored.

Table 17 Measurement Ranges

Command Power Range

RYY

RNN

R17
R16
R15
R14
R13
R12

R11

R10
R09
R08
R07
R06
R05
R04
R03
R02
R01
R00

Table 17

.

Turn auto range on
Turn auto range off. Keep present range

18.0 – 199.9 MW

1.80 – 19.99 MW

0.180 – 1.999 MW

18.0 – 199.9 kW

1.80 – 19.99 kW

0.180 – 1.999 kW

18.0 – 199.9 W

1.80 – 19.99 W

0.180 – 1.999 W

18.0 – 199.9 mW

1.80 – 19.99 mW

0.180 – 1.999 mW

18.0 – 199.9 μW

1.80 – 19.99 μW

0.180 – 1.999 μW

18.0 – 199.9 nW

1.80 – 19.99 nW

0.180 – 1.999 nW

Terminators (Yx)

Function

Selects the characters that follow the end of a data string. Set x to:

 “T” for two terminators; a carriage return (CR) and a line feed (LF).
 “O” for one terminator; a carriage return (CR).
 “N” for no terminator.

Remarks

Many controllers use the terminator sequence to recognize the end of an input string.
Using incorrect terminators can lock the bus.

30

Thruline RF Power Meter, Model 4421

Prefixes (Px)

Function

Turns the prefix mode on or off. Set x to:

 “Y” to enable prefixes.
 “N” to disable prefixes.

Remarks

Prefixes are sent over the bus with the measurement, and indicate the status of the
current measurement (see

 “FC”,”FD”,”RC”,”RD”,”SW”,”RL”,”MN”,”MX” indicates the measurement type.
 “U” indicates underflow; the value sent is “.000”.
 “O” indicates overflow; the value sent is “199.9”.
 “N” indicates normal; the value sent is a normal on-scale reading.
 “4421” indicates the Bird model number.

Table 18 Prefix Examples

Data String Description

NFC.0.123W(CR)(LF) Normal (N) forward carrier wave (FC), prefixes on

OFC 199.9W(CR)(LF) Overflowed (O) forward carrier wave (FC), prefixes on

199.9W(CR)(LF) Overflowed forward carrier wave, prefixes off

URD .000W(CR)(LF) Underflowed (U) reflected dBm (RD), prefixes on

Table 18

for examples):

Triggers (Tx)

Function
Remarks

Table 19 Trigger Conditions

Selects the condition which will trigger a reading (see

Failure to trigger device before requesting a reading will lock the bus.

Fastest reading rate is 2.4 readings/second; slowest is 1 reading/sec.

Command Trigger Condition

T0

T1

T3

T5

Table 19

Continuous on ENT

One shot on ENT

One shot on TRG

One shot on measurement command (FC, FD,
RC, RD, SW, RL, MN, MX)

).

31

Status (Ux)

RS-232 Interface

Function

Reads a status word and returns the information as a string. Set x to:

 “0” for machine status.
 “1” for error status.
 “2” for revision history.

Remarks

Figure 13 Machine Status Word Format

Note: This command sets the unit to the settings that were last issued remotely (through RS-232 or
GPIB). Therefore, it will over ride any manual changes selected at the front panel of the unit.

After sending the status command, a status word is sent the next time the unit is
addressed to talk. To ensure the correct status is transmitted, the status word should be
requested as soon as possible after the command is sent.

Machine Status Word (U0) — The format of the machine status word is shown in

Figure 13

. The default values are also shown.

Error Status Word (U1) — The format of the error status word and the possible

error messages are shown in
after the U1 command is sent.

Figure 14 Error Status Word Format

Status Meaning Description

ICM Invalid Command Set when an illegal device-dependent command

VCM Valid Command Set when no IDDC is received.
ICO Invalid Command

Option

VCO Valid Command Option Set when no IDDCO is received.
PS Self-test Pass Set when a self-test has been initiated by the J0

FL Self-test Fail Set when the self-test has failed. (This is the

Figure 14

(IDDC) such as V2 is received. (V is illegal)

Set when an illegal device-dependent command
option (IDDCO) such as T6 is received. (6 is
illegal)

command and the test result is acceptable.

default condition.)

. All flags will revert to their non-error states

32

Thruline RF Power Meter, Model 4421

Revision History Word (U2) — The format of the revision history word is shown in

Figure 15

Figure 15 Revision History Word Format

.

Self Test (J0)

Function
Remarks

Initiates a hardware and software test.

Results are stored in the U1 status word (see

“J0” must be sent each time before reading the result.

Writable Store (W x x x x x x)

Function
Remarks

Storage for six bytes of ASCII data.

Data stored is lost when the 4421 is turned off.

Data is sent back as part of the U2 status word

"Status (Ux)" on page 32

).

33

Chapter 6 Maintenance

This chapter describes routine maintenance, along with troubleshooting instructions for the power meter and
power sensor. Disassembly instructions for the Bird Cal Cart are also provided. For service beyond this level, return
the unit to a qualified service center.

WARNING

To avoid personal injury, disconnect the power cord from the AC line before

performing any maintenance, including fuse replacement or changing the line voltage

setting.

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.

The Bird 4421 Power Meter requires only simple, routine maintenance.

 Wipe off dust and dirt regularly.
 Check the connectors and cables for damage.
 Clean the connector contacts with alcohol or dry cleaning solvent.

Cleaning

CAUTION

Do not use harsh or abrasive detergents for cleaning.

Clean the Bird 4421 Power Meter and its display with a soft cloth dampened with mild detergent and water only.
Clean sensors with a dry cleaning solvent that leaves no residue.

Troubleshooting

Since the power meter and power sensor can only work together, the first step is to determine which is
malfunctioning. Connect the power sensor to the meter and perform the
power meter is malfunctioning, refer to the troubleshooting table below. If the power sensor is malfunctioning,
return it for service.

CAUTION

Due to the complexity of the Bird Power Sensor, field repairs beyond general

maintenance should not be attempted.

Removal or disturbance of the power sensor cover can result in cancellation of lifetime

warranty.

This manual cannot list all malfunctions that may occur, or corrective actions. If a malfunction is not listed or is not
corrected by the listed corrective actions, contact a qualified service center.

Note: For power sensors in Cal Carts, following the test procedure will check the sensor not covered
by the safety cover. To test the other sensor slide the safety cover over, then proceed as normal.

"Functional Test" on page 35

. If the

34

Thruline RF Power Meter, Model 4421

PROBLEM POSSIBLE CAUSE CORRECTION

Have the batteries been charged? Recharge the batteries.

Power meter has no power

Is the power meter’s ac power
cord connected?

Is the ON/OFF rocker switch on
the rear panel set to OFF?

(Cal Cart only)

Is the Cal Cart’s AC power cord

Connect the power cord.

Set the switch to ON.

Connect AC power.

connected to the AC line?

Check fuse rating and replace fuse

Blown fuse?

(See

"Replacing Fuses" on

page 37

).

Is the sensor cable connected to

Dash moves across the display

both the power meter and power
sensor?

Connect sensor cable.

Is the sensor cable defective? Replace sensor cable.

Display blank or not updating Have the batteries been charged?

Power meter turns off while on
battery power

Push buttons do not respond

Is “LO BAT” displayed?

Test the push buttons (See

Button Test" on page 36

"Push

). Are

NO: Recharge battery
YES: Return meter for service.

YES: Recharge battery
NO: Return meter for service.

Return meter for service.

they defective?

Every segment on the display is lit Return meter for service.

IEEE-488 Interface does not
respond to the interface link

Are the address in the interface
program and the address setting
on the DIP switches on the
interface module the same?

Send the “J0” self test command,
then check the status. Does the

Change the program or DIP switch
setting so that the addresses are
the same (See

page 12

).

Replace I/O hub PCB.

power meter fail the self test?
Is the IEEE cable defective? Replace IEEE interface cable.

RS-232 Interface does not respond
to the interface link. Fails J0 self­test command.

Are the DIP switches set correctly? Set DIP switches.

Is the RS-232 cable defective? Replace RS-232 interface cable.

For “talk/listen” operation, set

With the RS-232, the power meter
displays “TALK” but does not
operate as expected.

Is DIP switch 2 set correctly?

Is DIP switch 1 set correctly?

this switch to ON. For “talk
always” set this switch to OFF.

Set DIP switch 1 as indicated in

Figure 12 on page 25

"Dip Switch" on

.

Functional Test

1. Turn the power meter off. The ON/OFF switch on the rear panel should be OFF and the ac power cable should
be connected.

2. Turn ON the ON/OFF switch on the rear panel of the meter.

3. While holding down the FWD and SWR push buttons, press the ON/OFF button on the front panel of the power
meter. Immediately release all three.

35

Maintenance

Note: The unit tests the display on power up cycling through and activating each segment two times
and then activating all segments at once two times.

4. The power meter’s model number and revision date should scroll across the display. If a dash “–” is displayed
instead, then the meter is malfunctioning.

5. The power sensor’s model number and revision date should scroll across the display. If a dash is displayed after
the power meter data, then the power sensor is malfunctioning.

Figure 16 Test Display, No Malfunction

Push Button Test

Note: If a push button is malfunctioning, return the power meter.

1. Disconnect the power sensor.

2. Turn the power meter ON.

Note: After the power up display disappears, a dash “–” should scroll across the display.

3. Turn the power meter OFF.

4. Connect the power sensor.

5. Turn the power meter ON.

Note: “AUTO” and “FWD” should be displayed, and a reading of “0.00 W” (or a very low number).

6. Press RFL.

Note: “FWD” should change to “RFL” on the display. The reading should remain the same.

7. Press SWR.

Note: “RFL” should change to “SWR”. “0.00 W” should change to “ ” (underrange error).

8. Hold down MIN.

Note: “ ” should change to “ ” (overrange error).

9. Release MIN.

Note: “ ” should change to “ ”.

10. Press dBm.

Note: “SWR” should turn OFF and “dBm” should turn ON.

36

Thruline RF Power Meter, Model 4421

11. Press dBm.

Note: “dBm” should change to “SWR”.

12. Press FWD.

Note: “SWR” should change to “FWD” and “ ” to “.0000 W” (or a very low number).

13. Hold down MAX.

Note: “.0000” should change to “1.0000”.

14. Release MAX.

Note: “1.0000” should change to “.0000” (or a very low number).

15. Press LIGHT.

Note: The back-light should turn on.

16. Press LIGHT.

Note: The back-light should turn off.

17. Press s (up).

Note: The power meter should change ranges each time it is pressed until it reaches “0.000 KW”.

18. Press t (down).

Note: The power meter should change ranges each time it is pressed until it reaches “0.00 W”.

19. Turn the power meter OFF.

Power Meter Repair

WARNING

To avoid personal injury, disconnect the power cord from the AC line before

performing any maintenance, including fuse replacement or changing the line voltage

setting.

Replacing Fuses

WARNING

To avoid personal injury, disconnect the power cord from the ac line before

performing any maintenance, including fuse replacement.

CAUTION

Failure to install the properly rated fuse may result in equipment damage or nuisance

failures.

1. Gently pry the fuse drawer out of the AC module. The fuse holder does not detach from
the AC module. See

Figure 17

.

2. Install the replacement fuses then close and secure the fuse holder. Fuse 1 is a spare
fuse and fuse 2 is the active fuse.

37

AC Line Voltage Fuse Rating

115 Vac T630 mA, 5x20 mm Time Lag Fuse
230 Vac T315 mA, 5x20 mm Time Lag Fuse

Figure 17 AC Line Fuse

Maintenance

38

Thruline RF Power Meter, Model 4421

Replacing Batteries

There are two battery configurations in the 4421 Power Meter. In the larger case models (before 2016), the
batteries are horizontally arranged, in units with a smaller case the batteries are vertically arranged in a battery
assembly.

Replace Batteries (Older models)

WARNING

Exposed AC line voltage (115 VAC or 230 VAC). Disconnect the power cord from the

AC line before replacing the batteries. Failure to comply may result in severe

electrical shock or death.

WARNING

Use only Nickel Metal Hydride (NiMH) batteries that have a minimum capacity of 4500

milliampere hours (mAh). Do not install batteries that are not Nickel Metal Hydride.

Do not install NiMH batteries that have less than 4500 mAh capacity. Failure to

comply may result in damage to the batteries, damage to the instrument, and injury

to personnel from battery chemicals.

1. Disconnect the AC power cord from the AC mains supply.

2. Remove the four screws that secure the top cover.

3. Lift the top cover to access the attached ground wire.

4. Disconnect the ground wire.

5. Remove the cover.

6. Unfasten the battery retaining belts (

Figure 18

).

7. Remove the battery tubes.

Note: Be sure to note the polarity and orientation of the battery tubes before removing them.

8. Remove the batteries from each tube.

9. Insert replacement batteries.

Note: Be sure to note the polarity (positive and negative) arrangement of the batteries.

10. Install the battery tubes into the unit and secure with the retaining belts.

Note: Be sure to position the retaining belts as they were before removal and tighten them securely.

11. Connect the ground wire to the top cover.

12. Install the top cover.

13. Secure top cover with the four screws removed earlier.

39

Figure 18 Batteries

Maintenance

Item Description

1 Battery retaining belt

2

Battery tube (batteries
inside)

Replace Batteries (Newer Models)

WARNING

Exposed AC line voltage (115 VAC or 230 VAC). Disconnect the power cord from the

AC line before replacing the batteries. Failure to comply may result in severe

electrical shock or death.

WARNING

Use only Nickel Metal Hydride (NiMH) batteries that have a minimum capacity of 4500

milliampere hours (mAh). Do not install batteries that are not Nickel Metal Hydride.

Do not install NiMH batteries that have less than 4500 mAh capacity. Failure to

comply may result in damage to the batteries, damage to the instrument, and injury

to personnel from battery chemicals.

1. Disconnect the AC power cord from the ac mains supply.

2. Remove the four screws that secure the top cover.

3. Lift the top cover to access the attached ground wire then disconnect the ground wire and remove the cover.

4. Remove two retaining screws securing the battery assembly. See

Figure 19

.

5. Disconnect battery assembly power supply connector.

40

Thruline RF Power Meter, Model 4421

Figure 19 Battery Assembly Removal

6. Lift the battery assembly out of the Power Meter.

7. Unfasten the battery retaining belts then remove the battery tubes (

Figure 20

). Be sure to note the polarity

and orientation of the battery tubes before removing them.

Figure 20 Battery Assembly

8. Remove the batteries from each tube and insert replacement batteries. Be sure to note the polarity (positive
and negative) arrangement of the batteries.

9. Install the battery tubes into the battery assembly and secure with the retaining belts. Be sure to position the
retaining belts as they were before removal and tighten them securely.

10. Install battery assembly in the Power Meter. Align tabs on battery assembly with slots in Power Meter.

11. Install two screws to secure battery assembly to Power Meter.

12. Connect the battery assembly power supply connector to the main board.

13. Connect the ground wire to the top cover.

14. Install the top cover and secure it with the four screws removed earlier.

41

Maintenance

Long Term Storage

Do not store the instrument for long periods of time without recharging the batteries. When the instrument is
stored for long periods of time without use, the batteries will loose their charge and also loose the ability to reach
full charge when put into service. To restore the battery charge, perform a full charge for 28 hours. If the batteries
are not fully charged after 28 hours, completely discharge the batteries then perform a full charge again. If
necessary, repeat this discharge and charge cycle up to three times. If the batteries do not remain charged after
three discharge-charge cycles, replace the batteries.

Cal Cart Repair

It is recommended that you reference the specific cal cart manual for procedures tailored to each Cal Cart type.

Front Panel (Cal Cart only)

Note: If the power meter is mounted in a Cal Cart, to access the power sensor or the ac connections, it

will be necessary to remove the front panel of the Cal Cart.

1. Remove both screws on the front panel, between the RF connector and the handle.

2. Pull on the handle set into the base of the front panel to remove it.

Note: When making AC connections, refer to the following wiring diagram.

Cord Reel (Cal Cart only)

1. Disconnect the cord reel from the terminal strip.

2. Unscrew the AC connector.

3. Unscrew and remove the cord reel.

4. Screw the replacement cord reel into place.

5. Thread the AC connector through the grommet, and connect the wires on the other end to the terminal strip
(See

Figure 21 on page 42

Figure 21 Cal Cart Wiring Schematic

).

42

Thruline RF Power Meter, Model 4421

Power Sensor (Cal Cart only)

To avoid personal injury, disconnect the power cord from the AC line before

performing any maintenance, including fuse replacement or changing the line voltage

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.

The Bird 4421 must be powered off when connecting or disconnecting the power

Changing the sensor’s connectors will invalidate calibration data, and may reduce the

WARNING

setting.

WARNING

CAUTION

sensor from the power meter.

CAUTION

maximum power rating of the unit.

CAUTION

Due to the complexity of the Bird Power Sensor, field repairs beyond general

maintenance should not be attempted. Removal or disturbance of the power sensor

cover can result in cancellation of lifetime warranty.

1. Disconnect the RF line from the Cal Cart.

2. Remove the Cal Cart front panel (see

3. Disconnect the sensor cable from the power sensor.

4. Disconnect the RF cable from the sensor output port.

5. Remove the screws on the sensor mounting bracket.

6. Remove the sensor from the mounting bracket.

7. Put the new sensor in the bracket and screw it into place.

"Front Panel (Cal Cart only)" on page 42

).

Note: Make sure the arrow on the side of the sensor points towards the load, and that the end labeled “SOURCE”

points towards the front of the Cal Cart.

8. Connect the RF cable to the sensor end labeled “LOAD”. Connect the sensor cable.

9. Replace the Cal Cart front panel.

Load

WARNING

Heavy load. Do not attempt to lift unaided.

1. Disconnect all RF cables from the RF connectors on the load.

2. Unplug the blower assembly on blower-equipped loads.

3. Replace the vent plugs with the shipping plugs.

4. Remove the mounting bolts connecting the load to the Cal Cart.

5. Remove the load.

43

Casters (Cal Cart only)

Maintenance

1. Remove the load (See

2. Flip the cart over.

3. Unscrew the defective caster.

4. Screw the new caster into place and replace the load.

Handle (Cal Cart only)

1. Unscrew the handle

2. Remove the old handle.

3. Screw the new handle into place.

"Load" on page 43

).

Storage and Shipment (Cal Cart only)

Cover the unit before storing to keep out dust and dirt. It is not necessary to install the shipping plug. Store in a dry,
dust-free environment where the ambient temperature will remain between –20 and +50 °C (–4 to +122 °F).

Before shipping the Bird Cal Cart, take the following precautions:

 Remove the vent plugs and replace them with the shipping plugs. Wrap the vent plugs with padding and

tape them to the side of the load for protection.

Note: With the shipping plugs installed, it is not necessary to empty out the coolant.

 Repack in the original carton or contact Bird for a transit case.

44

Thruline RF Power Meter, Model 4421

Specifications, Cal Cart

To determine the model numbers of the Cal Cart components, refer to specific cal cart manual. For load
specifications, refer to the load manual included.

Note: Certain sensors or connectors may be incompatible with some models. Refer to specific cal cart
manual for a list of available components, or contact Customer Service.

Max. Power

Under normal operating conditions, the Cal Cart’s maximum power is the MINIMUM of the max. power of the
sensor and the max. power of the load. The following modifiers apply:

 Above 65 MHz, derate the load’s max. power. See

Figure 22 on page 51

.

 Due to the wide variety of available connectors, frequency range and maximum power may be reduced.

Insertion loss is specified with female N connectors. Choose connectors appropriate for the frequency and
power of operation.

 Derate RF power by 2.5% for every 305m (1,000 ft.) above 1,520m (5,000 ft.).

Table 20 Bird Cal Cart

Frequency Range Sensor dependent, 30 MHz max.
Power Range Dependent on sensor, sensor connectors, and load

Connectors

Dimensions

Short Cart
Long Cart

Weight, Nominal

Short Cart
Long Cart

Temperature Range

Operating

Storage
Altitude 1520 m (5000 ft.)
Humidity 85% noncondensing max

Calibration Cycle, Nominal

CE

Customer specified (See

page 52

42”L x 20”W x 42”H (1067 x 508 x 1067 mm)
52”L x 20”W x 42”H (1321 x 508 x 1067 mm)

175 lbs. (80 kg)
290 lbs. (114 kg)

0 to +35 °C (32 to +95 °F)
– 20 to +70 °C (– 4 °F to +158 °F)

1 year
CE Compliant. Refer to Declaration of Conformity for

specific standards.

)

"Available Connectors" on

45

Specifications, 4421 RF Power Meter

Table 21 Bird 4421 RF Power Meter

Frequency Range Sensor dependent
Power Range Sensor dependent
VSWR Display 1.0 – 199.9 max
Return Loss Display 0 to 40 dB max
Display Accuracy ± 1 on least significant digit
AC Power 115 / 230 Vac @ 50 / 60 Hz; 60 W
Batteries 8 Nickel Metal Hydride 1.2 v cells, rechargeable

Battery Life

Battery Charger

Display

Interfaces

Fuse Rating IEC (5 x 20 mm) Time Lag Type T
115 VAC

230 VAC

CE

Humidity 95% max. (noncondensing)
Altitude Up to 10,000 feet (3,000 m)
Temperature Range
Operating

Storage
Dimensions

2016 and prior

2016 and newer
Weight, Nominal 9.5 lbs. (4.3 kg)

Approximately 8 hours continuous usage
(reduced after high temperature charging)

Built-in battery charger. Drained batteries require
approximately 28 hours to recharge.

LCD, 4½ digit display. Indicates mode, measurement units,
battery condition, remote status, and signal increase /
decrease. Self contained backlight.

IEEE-488 GPIB
RS-232

T630 mA
T315 mA

CE Compliant. Refer to Declaration of Conformity for
specific standards.

0 to 50 °C (32 to 122 °F)
–20 to +50 °C (–4 to +122 °F)

12.3”L x 12.2”W x 4.2”H (312 x 309 x 103 mm)

10.7”L x 12.2”W x 4.2”H (271 x 309 x 103 mm)

Maintenance

Changing the sensor’s connectors will invalidate calibration data, and may reduce the

CAUTION

maximum power rating of the unit.

46

Thruline RF Power Meter, Model 4421

Specifications, Power Sensors

Table 22 Specifications Common to all Sensors

Impedance, Nominal 50 ohms
Max. Allowable Terminating VSWR 2.00:1

Frequency-specific calibration factors stored in

Calibration Technique

nonvolatile memory in each sensor.
Sensor output corrected for frequency and
temperature within specified ranges.

Calibration Cycle, Nominal

4027A and 4027F, 6 months
All other models, 1 year

Calculated from FWD accuracy and FWD power

Accuracy, Reflected

RFL Accuracy FWD Accuracy

Calculated from FWD and RFL power

Accuracy, VSWR

Sampling Rate, Nominal 2 readings / second
Operating Power Supplied by power meter via sensor cable

Connectors

4028B10M
4028C10M
4028A Series
All other models

CE

1-5/8” EIA Flanged
3-1/8” EIA Flanged
7-16 DIN, LC, HN, or 7/8”
Customer specified from QC list, appropriate for
frequency and power.

CE Compliant. Refer to Declaration of Conformity

for specific standards.
Humidity, Max. 95% (noncondensing)
Altitude, Max. 10,000 feet (3,000 m)
Temperature Range

Operating
Storage

Dimensions

4028B3M, 4028B10M
4028A Series
All other models

Weight, Nominal

4028B3M, 4028B10M,
4028C10M

4028A2M, 3M, 4M, 10M,
and 25M

All other models

0 to 50 °C (32 to 122 °F)

–20 to +70 °C (–4 to +158 °F)

6.75”L x 3.5”W x 4.75”H (175 x 89 x 121 mm)

4.7”L x 3.2”W x 3.8”H (120 x 82 x 97mm)

5.2”L x 2.5”W x 3.25”H (137 x 64 x 83 mm)

5 lb. 2 oz. (2.33 kg)

3 lb. 5 oz. (1.5 kg)

1 lb. 13 oz. (0.8 kg)

VSWR 1





FWD Power

---------------------------------+=
10



P

R

1

=

-------+



P



F

Directivity 10/

P

R

-------–

P

F

47

Table 23 Bird 4020 Series RF Power Sensors

Maintenance

RF Power Range

4021, 4022
4024, 4025

Frequency Range

4021
4022
4024
4025

Accuracy, Fwd, Best Case

†

VSWR, Max.

4021, 4024, 4025
4022

Insertion Loss, Max.

4021, 4024, 4025
4022

Directivity, Min.

4021
4022

4024
4025

† For rated accuracy, no more than 1% AM; Harmonics –50 dBc or less

Derate accuracy by 3.0% (1

300 mW – 1 kW
3 W – 10 kW

1.8 – 32 MHz
25 MHz – 1 GHz

1.5 – 32 MHz
100 kHz – 2.5 MHz

± 3% (1)

1.05:1

1.05:1, 25 – 512 MHz and 1.10:1, 512 MHz – 1 GHz

0.05 dB

0.05 dB, 25 – 512 MHz and 0.13 dB, 512 MHz – 1 GHz

30 dB
26 dB (28 dB typ), 400 – 1000 MHz
30 dB, 25 – 400 MHz
28 dB, 1.5 – 2.5 and 25 – 32 MHz and 30 dB, 2.5 – 25 MHz
28 dB, 100 – 125 kHz and 30 dB, 125 – 2500 kHz

) below 15 °C and above 35 °C

CAUTION

Changing the sensor’s connectors will invalidate calibration data, and may reduce the

maximum power rating of the unit.

Table 24 Bird 4027A Series RF Power Sensors

Frequency Range
4027A250K 250 – 400 kHz

4027A400K 400 – 550 kHz
4027A800K 800 – 950 kHz
4027A2M 1.5 – 2.5 MHz
4027A4M 3 – 5 MHz
4027A10M 10 – 15 MHz

RF Power Range
4027A12M 300 mW – 1 kW
4027A25M 3 W – 9 kW
4027A35M 3 W – 7.5 kW
4027A60M 3 W – 6 kW

Accuracy, Fwd, Best Case

Calibration Frequencies, Typical (MHz)

4027A250K 0.25, 0.40
4027A400K 0.40
4027A800K 0.90
4027A2M 1.8, 2.0, 2.17
4027A4M 4.0, 5.0
4027A10M 10.0, 13.56, 15.0

Calibration Power, Typical

4027A12M
All other models

VSWR, Max.
Insertion Loss, Max. 0.05 dB (with female “N” connectors)

†

††

4027A12M 10 – 15 MHz
4027A25M 25 – 30 MHz
4027A35M 35 – 45 MHz
4027A60M 45 – 65 MHz
4027A100M 95 – 105 MHz
4027A150M 150 – 170 MHz

4027A100M 3 W – 4 kW
4027A150M 3.75 W – 3.75 kW
All other models 3 W – 10 kW

± 1.0% (1)

4027A12M 10.0, 13.56, 15.0
4027A25M 25.76, 27.12, 28.48
4027A35M 40.68
4027A60M 55.0, 60.0
4027A100M 95.0, 100.0
4027A150M 162.0

700 W

1.7 kW

1.05:1

48

Thruline RF Power Meter, Model 4421

Directivity, Min.

4027A12M
All other models

† For rated accuracy, no more than 1% AM; Harmonics –50 dBc or less

Derate accuracy by 1% (1
Derate accuracy by 1% (1

†† Other calibration frequencies available upon request

) outside cal. power or cal. frequency
) below 15 °C and above 35 °C

Table 25 Bird 4027F Series RF Power Sensors

Frequency Range

4027F2M
4027F10M
4027F60M

RF Power Range

4027F2M, 4027F10M
4027F60M

Accuracy, Fwd, Best Case ± 1.0% (2
Calibration Frequencies, Typical

4027F2M
4027F10M
4027F60M

Calibration Power, Typical 1.7 kW
Harmonic Rejection, Min.

4027F2M
4027F10M
4027F60M

Low Frequency Rejection, Min.

4027F10M
4027F60M

Max Error Induced by 10% AM

4027F2M, 4027F10M
4027F60M

VSWR, Max. 1.05:1
Insertion Loss, Max. 0.05 dB (with female “N” connectors)
Directivity, Min. 28 dB

1.8 – 2.2 MHz
12 – 15 MHz
57 – 63 MHz

0.1 – 10 kW

0.1 – 3 kW

†

1.8, 2.0, 2.17 MHz

12.0, 12.5, 13.56, 14.0, 15.0 MHz

57.0, 58.5, 60.0, 61.5, 63.0 MHz

26 dB @ 3.6 – 3.8 MHz, 30 dB @ > 3.8 MHz
30 dB @ > 25 MHz
30 dB @ > 114 MHz

30 dB @ < 1 MHz
30 dB @ < 15 MHz

0.2% @ < 5 kW, 1.0% @ 5 – 10 kW

0.2% @ < 1.5 kW, 1.0% @ 1.5 – 3 kW

30 dB
28 dB

)

† Other calibration frequencies available upon request

Table 26 Bird 4028A and 4028B Series RF Power Sensors

Frequency Range

4028A250K
4028A400K
4028A2M
4028A3M
4028A4M
4028A10M, 4028B10M,
4028C10M
4028A25M
4028B3M

RF Power Range

4028A250K, 4028A400K
4028C10M

All other models

Accuracy, Fwd, Best Case

49

250 – 400 kHz
400 – 550 kHz

1.5 – 2.5 MHz

2.5 – 3.5 MHz

3.5 – 4.5 MHz

10 – 15 MHz
25 – 30 MHz

2.5 – 4 MHz

1 kW – 20 kW
500W – 50 kW

†

1 kW – 25 kW
± 2.0% (2)

Maintenance

Calibration Frequencies, Typical
(MHz)††

4028A250K
4028A400K
4028A2M
4028A3M
4028A4M
4028A10M, 4028B10M,
4028C10M
4028A25M
4028B3M

Calibration Power, Typical 3.5 kW
VSWR, Max. 1.05:1
Insertion Loss, Max. 0.05 dB (with female 7-16 DIN connectors)
Directivity, Min. 28 dB

† For rated accuracy, no more than 1% AM; Harmonics –50 dBc or less

Derate accuracy by 2% (2
Derate accuracy by 2% (2

†† Other calibration frequencies available upon request

Specifications, RS-232 Interface

Table 27 RS - 232 Interface

Logic Levels Meets all EIA Standard RS-232-C specifications
Modes of Operation Switch and bus selectable
Talk Always Allows the 4421 to send to the bus keyboard-initiated

Addressable Allows the 4421 to be commanded by an RS-232 interface controller
Connector RS-232 Interface Type
Humidity, Max 95% (non-condensing)
Altitude, Max 10,000 feet (3,000 m)
Temperature Range

Operating
Storage

Dimensions 6.5”L x 4.5” W (165 x 115 mm)
Weight 0.5 lbs (0.23 kg) nominal

measurements only

0 to 50º C (32 to 122º F)
–20 to +50º C (–4 to +122º F)

0.25, 0.40

0.40

1.8, 2.0, 2.17

2.5, 3.2, 3.5

3.5, 4.0

10.0, 13.56, 15.0

25.76, 27.12, 28.48

2.5, 3.2, 3.5, 4.0

) outside cal. power or cal. frequency
) below 15 °C and above 35 °C

Specifications, IEEE-488 GPIB Interface

Table 28 IEEE - 488 Interface

Logic Levels Meets all IEEE Standard 488-1978 specifications
Modes of Operation Switch and bus selectable
Talk Only Allows the 4421 to send to the bus keyboard-initiated measurements

Addressable Allows the 4422 to be addressed as talker or listener under the

Connector Standard IEEE-488 bus type
Humidity, Max 95% (non-condensing)
Altitude, Max 10,000 feet (3,000 m)
Temperature Range

Operating
Storage

Dimensions 6.5”L x 4.5” W (165 x 115 mm)
Weight, Nominal 0.5 lbs (0.23 kg)

only

command of an IEEE-488 bus controller

0 to 50º C (32 to 122º F)
–20 to +50º C (–4 to +122º F)

50

Thruline RF Power Meter, Model 4421

Figure 22 High Frequency Derating 1

Figure 23 High Frequency Derating 2

51

Replacement Parts

Table 29 Replacement Parts

Description Qty Part Number

Fuse, IEC (5 x 20 mm) Time Lag Type T

115 VAC, T630 mA
230 VAC, T315 mA

Cord, AC Power

115 VAC

230 VAC Harmonized
Plug, 115 VAC 1 5A2626
Cable, Sensor 1 4421-038
Grommet 1 4421A372-1
Cordreel (Cal Cart) 1 4421A383
Casters (Cal Cart) 4 4421A384
Handle (Cal Cart) 1 4421A385
Cable, IEEE-488

2 m

1 m
Cable, RS-232

10 ft.

5 ft.
Null Modem Kit (RS-232 only) 1 4380-250
Panel Mount Kit 1 4421-250
Battery, C size, NiMH 8 5A1230

Maintenance

1

1

1

1

5A2257-14
5A2257-11

5-1286
5A2416

5-1317-2
5-1317-1

5-1662-2
5-1662-1

Available Connectors

Changing the sensor’s connectors will invalidate calibration data, and may reduce the

CAUTION

maximum power rating of the unit.

Connector P/N

HN (F) 4240-268
LC (F) 4240-031
BNC-Female 4240-125
BNC-Male 4240-132
C-Female 4240-100
C-Male 4240-110
HN-Female 4240-268
HN-Male 4240-278
LC-Female 4240-031
LC-Male 4240-025
Open Term. # 10-32 Nut 4240-080
N (F) 4240-062

52

Thruline RF Power Meter, Model 4421

7/16 Jack, IEC Type 169-4 4240-344
LT-Female 4240-018
LT-Male 4240-012
N-Female 4240-062
N-Male 4240-063
SC-Female 4240-090
SMA-Female 4240-336
SMA-Male 4240-334
7/16 Jack, IEC Type 169-4 4240-344
7/16 Plug, IEC Type 169-4 4240-363
TRU 6934 (F) 4240-371
TRU 7958 (F) 4240-372
Mini UHF-Female 4240-346
UHF-Female 4240-050
UHF-Male 4240-179
1-5/8” EIA Fixed 4240-096
1-5/8” EIA Swivel 4240-208
7/8” EIA 4240-002
TNC-Female 4240-156
TNC-Male 4240-160

Customer Service

Any maintenance or service procedure beyond the scope of those in this chapter should be referred to a qualified
service center.

If the unit needs to be returned for any reason, request an Return Material Authorization (RMA) through the Bird
Technologies website. All instruments returned must be shipped prepaid and to the attention of the RMA number.

Bird Service Center

30303 Aurora Road
Cleveland (Solon), Ohio 44139-2794
Fax: [phone]
E-mail: [e-mail]

For the location of the Sales Office nearest you, visit our Web site at:

http://www.birdrf.com

53

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 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. Routine (regularly required) calibration is
not covered under this limited warranty. 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.

Special Lifetime Warranty - Series 4020, Series 4027A,

Series 4027F, and Series 4028 Power Sensor Head

In addition to its standard warranty, the Bird Electronic Corporation warrants its Series 4020, Series 4027A, Series
4027F, and Series 4028 Thruline Power Sensor Heads for lifetime to original purchaser. This extended warranty is
against burnout. For the warranty to apply, the Sensor Head must be used with the correct Bird Electronic Corpora­tion Display Unit, the maximum power rating of the Sensor must not be exceeded, the Sensor RF circuit must be
properly terminated and the Sensor not subjected to physical abuse.

Bird Electronic Corporation, at its option, will repair or replace the defective Sensor at its world Headquarters at
30303 Aurora Road, Solon, Ohio 44139.

The customer is responsible to pay transportation charges to return the defective sensor to Bird.

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