INSTRUCTION BOOKOPERATING INSTRUCTIONSMULTI-PURPOSETHRULINE® WATTMETERRF POWER ANALYST®MODEL 4391A©Copyright 2008 by Bird Electronic CorporationInstru
Bird Model 4391M Power Analystviii
ixTable of ContentsSafety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . iAbout This Manual . . . . . . . . . . . . . . . . . .
xTroubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 23General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Disasse
1Chapter 1 IntroductionThe Model 4391A is a multi-purpose Radio Frequency wattmeter designed around a microcomputer. A program stored in permanent mem
Bird Model 4391A Power Analyst2Description The instrument is housed in an aluminum case approximately 4-3/8 inches high by 9-5/8 inches deep by 6-1/4
3Chapter 2 Theory of OperationDescription ofOperationFigure 2 is a block diagram of the major functional parts of the Model 4391A RF Wattmeter. The Mi
Bird Model 4391A Power Analyst4Each reading output by the display is derived from up to three voltage readings using the circuitry described above. On
Theory of Operation5The electrical values of the element circuits are carefully balanced and designed so that current from the reverse wave will cance
Bird Model 4391A Power Analyst6
7Chapter 3 InstallationThe Model 4391A RF Power Analyst is completely portable and very suitable for field or laboratory use. Its power is derived fro
Bird Model 4391A Power Analyst8Connections The Model 4391A contains a short section of rigid 50 ohm coaxial air dielectric transmission line. To make
Installation9with the nominal power range of the elements. For example, if the forward element is a 5 watt element, the switches are set at 5 and x1.
Bird Model 4391A Power Analyst10
11Chapter 4 Operating InstructionsOperatingModesThe Model 4391A has nine modes of operation which are selected by pressing the mode keys momentarily.
Bird Model 4391A Power Analyst12signal coming from the element, whereas the Model 4391A uses peak and negative peak detector circuits to measure peak
Operating Instructions13Table 2VoltageStandingWave Ratio(VSWR) MeasuringPeakEnvelopePowerPEP power measurements are made in the same manner as CW powe
Bird Model 4391A Power Analyst14MeasuringAmplitudeModulationOnly a forward element is required for this mode. Point the element in the direction of fo
Operating Instructions15MeasuringPower in dBmOperation of the forward and reflected dBm modes is identical to the forward and reflected CW power modes
Bird Model 4391A Power Analyst16InsertionLoss orAttenuationAttenuation or insertion loss can be measured directly using an external single port line s
Operating Instructions17Using thePeaking AidThe peaking aid is useful for making adjustments to optimize any of the parameters which the Model 4391A m
iSafety PrecautionsThe following are general safety precautions that are not necessarily related to any specific part or procedure, and do not necessa
Bird Model 4391A Power Analyst18Battery Care With average use, the nickel metal hydride batteries in the 4391A will power the unit for 12 hours before
19Chapter 5 MaintenanceThe 4391A RF Power Analyst was designed and built to provide many years of trouble free service. This section provides the info
Bird Model 4391A Power Analyst20then perform a full charge again. If necessary, repeat this discharge and charge cycle up to three times. If the batte
Maintenance215. Switch on the Calibrator/Source and let it warm up for at least one hour.6. Set the Calibrator/Source to output 30 ±0.05 microamps.7.
Bird Model 4391A Power Analyst22Perform the following steps to adjust the contact spring.1. Using a small flat head screwdriver, place the flat side o
Maintenance23TroubleshootingGeneral The troubleshooting instructions are intended to aid in fault isolation. This is accomplished through the use of a
Bird Model 4391A Power Analyst24DisassemblyFront PanelRemoval1. Disconnect AC power from the instrument.2. Remove the six screws that secure the front
Maintenance255. Lift the front panel from the housing. Be careful to clear the line section blocks.6. Remove pads from the three toggle switches.Main
Bird Model 4391A Power Analyst26QCConnectorsRemoval1. Remove the eight screws (four on each connector) that secure the connectors to the housing (Figu
Maintenance27Line SectionRemoval1. Remove the QC connectors (page 26).2. Remove the four screws and lock washers that secure line section assembly to
Bird Model 4391M Power Analystii NOTE: Calls attention to supplemental informationFuse ReplacementAlways use the same type and rating of fuse when re
Bird Model 4391A Power Analyst286. Remove the two screws (item 4) that secure the PCB to the line section then pull the PC board assembly (item 3) awa
Maintenance298. Lower and secure the Main PC board assembly9. Replace and secure the front cover.10. Charge the batteries for 16 hours before using th
Bird Model 4391A Power Analyst30Parts ListThis section contains an illustrated list of all authorized replacement parts for the 4391A RF power Analyst
Maintenance31Figure 25Line SectionAssembly(S/N 1723and below)Item No. Description Part No. QtyFigure 251 Line Section, Subassembly 4381-005 12 PC Boar
Bird Model 4391A Power Analyst32Figure 26Line SectionAssembly(S/N 1724and above)Part No. Description Part No. QtyFigure 261 Line Section, Subassembly
Maintenance33Customer ServiceAny maintenance or service procedure beyond the scope of those in this chapter should be referred to a qualified service
Bird Model 4391A Power Analyst34SpecificationsMeasuring Medium RF Transmission in 50 ohm linesRF Power Range*100 mW to 10 kW full scale using Bird Pl
Limited WarrantyAll products manufactured by Seller are warranted to be free from defects in material and workmanship for a period of one (1) year, un
iiiCaution StatementsThe following equipment cautions appear in the text whenever the equipment is in danger of damage, and are repeated here for emph
Bird Model 4391M Power AnalystivSafety StatementsUSAGEANY USE OF THIS INSTRUMENT IN A MANNER NOT SPECIFIED BY THE MANUFACTURER MAY IMPAIR THE INSTRUME
vPRÉVENIR UN CHOC ÉLECTRIQUE DANGEREUX, NE PAS EFFECTUER D’ENTRETIEN SI L’ON N’A PAS ÉTÉ QUALIFIÉ POUR CE FAIRE.UNITS ARE EQUIPPED WITH RECHAREABLE BA
Bird Model 4391M Power AnalystviPRIMA DI EROGARE CORRENTE, ASSICURARSI CHE IL SELETTORE DI VOLTAGGIO 115/230 V.C.A. SIA REGOLATO CORRETTAMENTE E CHE I
viiAbout This ManualThis instruction book is arranged so that essential information on safety is contained in the front of the book. Reading the Safet
Comments to this Manuals