INSTRUCTION BOOK FOR RF DIRECTIONAL THRULINE® WATTMETER MODEL 43 Also Covers Models 4305, 4330, 4431, 4521-27, and 43P Electronic Corporation Cleveland (Solon) Ohio USA © Copyright 1998 by Bird Electronic Corporation Instruction Book Part Number 920-43 Revision.
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 throughly understood and applied to all phases of operation and maintenance. Keep Away From Live Circuits Operating personnel must at all times observe normal safety precautions. Do not replace components inside equipment with the high voltage supply turned on.
Bird Model 43 Wattmeter Resuscitation Personnel working with or near high voltages should be familiar with modern methods of resuscitation. Safety Symbols WARNING Warning notes call attention to a procedure which, if not correctly performed, could result in personal injury. CAUTION Caution notes call attention to a procedure which, if not correctly performed, could result in damage to the instrument.
WARNING Leaking RF energy is a potential health hazard. Never attempt to connect or disconnect equipment from the transmission line while RF power is being applied. Severe burns, electrical shock, or death can occur. Caution Statement The following equipment caution appears in the text whenever the equipment is in danger of damage, and is repeated here for emphasis.
Bird Model 43 Wattmeter BENUTZUNG WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET ALS VOM HERSTELLER BESCHRIEBEN, KANN DIE GERÄT ESICHERHEIT BEEINTRÄCHTIGT WERDEN. UTILISATION TOUTE UTILISATION DE CET INSTRUMENT QUI NEST PAS EXPLICITEMENT PRÉVUE PAR LE FABRICANT PEUT ENDOMMAGER LE DISPOSITIF DE PROTECTION DE LINSTRUMENT. IMPIEGO QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO DIVERSO DA COME SPECIFICATO DAL PRODUTTORE LA PROZIONE DI SICUREZZA POTREBBE VENIRNE COMPROMESSA.
WARTUNG ANWEISUNGEN FÜR DIE WARTUNG DES GERÄTES GELTEN NUR FÜR GESCHULTES FACHPERSONAL. ZUR VERMEIDUNG GEFÄHRLICHE, ELEKTRISCHE SCHOCKS, SIND WARTUNGSARBEIT EN AUSSCHLIEßLICH VON QUALIFIZIERTEM SERVICEPERSONAL DURCHZUFÜHREN. ENTRENTIEN LEMPLOI DES INSTRUCTIONS DENTRETIEN DOIT ÊTRE RÉSERVÉ AU PERSONNEL FORMÉ AUX OP ÉRATIONS P RÉVENIR UN D ENTRETIEN. CHOC POUR ÉL ECTRIQUE DANGEREUX, NE PAS EFFECTUER DENTRETIEN SI LON NA PAS ÉTÉ QUALIFIÉ POUR CE FAIRE.
Bird Model 43 Wattmeter RF VOLTAGE MAY BE PRESENT IN RF ELEMENT SOCKET -KEEP ELEMENT IN SOCKET DURING OPERATION. DE LA TENSION H.F. PEAT ÊTRE PRÉSENTE DANS LA PRISE DE LÉLÉMENT H.F. - CONSERVER LÉLÉMENT DANS LA PRISE LORS DE LEMPLOI. HF-SPANNUNG KANN IN DER HF-ELEMENTBUCHSE ANSTEHEN - ELEMENT WÄHREND DES BETRIEBS EINGESTÖPSELT LASSEN. PUEDE HABER VOLTAJE RF EN EL ENCHUFE DEL ELEMENTO RF - MANTENGA EL ELEMENTO EN EL ENCHUFE DURANTE LA OPERACION.
About This Manual This instruction book covers Thruline RF Directional Wattmeters Models: 43 4431 4525 43P 4521 4526 4305A 4522 4527 4331 4523 This instruction book is arranged so that the essential safety information appears in the front of the book. Reading the Safety Precautions Section before operating the equipment is strongly advised. The remainder of this instruction book is divided into Chapters and Sections.
Bird Model 43 Wattmeter Parts For location of parts, refer to the parts list and associated drawings in Chapter 5. Changes To The 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.
Table of Contents Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . Warning Statements. i . . . . . . . . . . . . . . . . . . . . . ii Caution Statement. . . . . . . . . . . . . . . . . . . . . . iii Safety Statements. iii . . . . . . . . . . . . . . . . . . . . . About This Manual. . . . . . . . . . . . . . . . . . . . . . vii Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Purpose and Function. . . . . . . . . . . . . . . . . . . . .
Bird Model 43 Wattmeter Connections. . . . . . . . . . . . . . . . . . . . . . . . . . 19 Remote Installation. . . . . . . . . . . . . . . . . . . . . . 20 Operating Instructions. . . . . . . . . . . . . . . . . . . . 23 Zero Adjust. . . . . . . . . . . . . . . . . . . . . . . . . . 23 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Normal Operation. . . . . . . . . . . . . . . . . . . . . . . 25 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . 31 Troubleshooting. . .
Model 4305A Replacement Parts List. . . . . . . . . . . . 45 Model 4330 Thruline Wattmeter. . . . . . . . . . . . . . . 45 Model 4330/31 Replacement Parts List. . . . . . . . . . . 46 Model 43P Peak Wattmeter. . . . . . . . . . . . . . . . . . . . . . 46 Model 43P Specifications. . . . . . . . . . . . . . . . . . . 47 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Peak Detector Response. . . . . . . . . . . . . . . . . . . 47 Model 43P Peak Calibration. . . . . . . . . . . . . . . . .
Bird Model 43 Wattmeter xii
Chapter 1 Introduction Purpose and Function This instruction book covers the use and operation of the basic Model 43 Thruline Wattmeter. These instructions also apply to other units that are very similar to the Model 43 in electrical characteristics and operation.
Bird Model 43 Wattmeter the base, and four rubber bumpers on the back, which allow the Model 43 to stand (vertical) or lie flat (horizontal) when used. For additional protection, the microammeter is specially shock mounted. A slotted screw is provided on the lower front face of the meter for zeroing the pointer. Below the meter, the RF line section face protrudes slightly from the wattmeter housing with the Plug-In Element socket in the center.
Introduction Raised Stop Edge Figure 1 Stop Pin Stop Pin On diametrically opposite sides of the Plug-In Element body are contacts to provide dc pickup in either direction of power flow, refer to figure 2. These contacts make connection with the spring finger of the dc jack only when the Plug-In Element is in the precise forward or reverse position, which occurs only when the stop pin on the element is in the lower level of the stepped line section casting face and against its respective stop.
Bird Model 43 Wattmeter Specifications These specifications include data covering Models 43, 43P, 4305A, 4330, 4431, 4521, 4522, 4523, 4525, 4526, and 4527. Specifications for models not listed are identical to the Model 43. Any specifications pertaining to a particular model will be found in the section for that model number, located at the back of this book.
Introduction Accuracy (All Models CW) (Model 43P, Peak Power) Dimensions, Nominal Models 43 ± 5% of full scale. ± 8% of full scale. 3-5/8"L x 4"W x 6-7/8"H (92.1 x 101.6 x 174.6 mm) Model 4431 3-27/32"L x 4"W x 6-7/8"H (97.6 x 101.6 x 174.6 mm) Model 4305A 4-5/32"L x 3-27/32"W x 6-53/64"H (105.
Bird Model 43 Wattmeter Model 43 Outline Drawing Socket for Extra Element 6-7/8" (174.6mm) Female "N" Q.C. Connectors (2) (Normally Supplied) 1-3/4" (44.5mm) 1-5/16" (33.3mm) 4" (101.6mm) 3-3/8" (85.7mm) 3-5/8" (92.
Chapter 2 Theory of Operation Travelling Wave Viewpoint The best way to visualize the Thruline Wattmeter principle is from the Travelling Wave viewpoint. In transmission lines, the voltages, currents, standing waves, etc., on any uniform line section are the result of the interaction of two Travelling waves: s The forward wave travels (and its power flows) from the source to the load. It has RF Voltage Ef and current If in phase, with Ef / If = Zo.
Bird Model 43 Wattmeter components of the Model 43 are illustrated in the Schematic diagram, figure 3. Figure 3 Element Schematic Diagram RF Coaxial Line XMTR or LOAD LOAD or XMTR Diode Directional Coupling Meter DC Connector Detector Element Bypass DC Contact Energy will be produced in the coupling circuit of the element by both mutual inductance and capacitance from the travelling RF waves in the line section.
Theory of Operation ence. Thruline Wattmeter measurements are also independent of their position along the standing waves. Standing Wave Ratio vs Reflected/Forward Power Ratio As mentioned above, the Thruline Wattmeter technique uses the Travelling Wave viewpoint to measure most of the outstanding facts about transmission line operation. Another widely used and related viewpoint, is the Standing Wave one, which is quite elaborately developed both mathematically and in existing equipment.
Bird Model 43 Wattmeter 1. Why make something similar to a hypothetical dc voltohm-meter with control pots for the voltmeter multipliers? Even more complications arise when diodes at RF are involved. 2. Experience using the Thruline Wattmeter for transmitter tune-up, antenna matching, etc. (i.e., on operating problems), shows that the power ratio φ is as useful in prac- tice as the standing wave ratio p = VSWR.
Theory of Operation be readily shown that reducing φ below 10 percent produces little gain in the way of increased Wl. TV transmitter antenna lines, and VHF omnirange transmitters are among those systems that require much lower levels of reflected power but for reasons other than simple power transmission. Note that in figure 4, the very small level of reflected power, i.e., φ = 0.06 percent corresponds to p = 1.05.
Bird Model 43 Wattmeter Figure 4 Percent Reflected Power VS. VSWR (1.0:1.3) Wr REFELECTED POWER f=¾ x 100 =——————————— x 100 Wf FORWARD POWER 2.0 1.0 .9 .8 .7 PERCENT REFLECTED POWER— f .6 .5 .4 .3 .2 .1 .09 .08 .07 .06 .05 .04 .03 .02 1.05 1.10 1.15 1.20 VSWR—r 12 1.25 1.30 1.
Theory of Operation Figure 5 Percent Reflected Power VS. VSWR (1.0:8.
Bird Model 43 Wattmeter and detection of reflected power is possible down to about 0.1 watt. φ= 0.1 = 0.00125 or close to 0.1% or to roughly p = 1.06 80 Caution is necessary in the above method and preferably it should not be used with element ranges differing by more than 10 to 1 although 25 to 1 can be used with extreme caution. With elements available having ranges down to one watt or less full scale, this method is usable with medium and low power transmitters.
Theory of Operation tenuation require allowance for normal instrument errors. The correction may be determined by direct rigid connection of the Thruline Wattmeter units, or of the Thruline Wattmeter - Termaline Load combination, in cascade. Slight juggling of the zero settings is permissible for convenience in eliminating computation, provided readings are being taken fairly well up on the scale. 3. Attenuation By Open Or Short Circuit Method.
Bird Model 43 Wattmeter Open circuit testing is somewhat to be preferred to short circuit, since the reference short (used to check equality initially) must be good, and because the initial equality is somewhat better on open than on short circuit. Again, for quite low values of attenuation, it is advisable to note exact readings, or difference, on the initial equality check, and to allow for this difference.
Theory of Operation Figure 6 Representative Frequency Response -10 -5 0 100 C Element 500 C Element -10 -5 0 Relative Response DB -10 -5 0 10 C Element 20 40 60 80 100 200 400 600 800 1000 Frequency In Megahertz Impedance Mismatch There may be cases where it is necessary to use the Model 43 on other than the 50 ohm circuit for which it is designed.
Bird Model 43 Wattmeter is less than 10 percent and the frequency is below 200 MHz, the four-inch length will produce a mismatch that is not too serious. But going any higher than these values, even if the transmitter is tuned up with the Model 43 in place, the load impedance will be very different after the Thruline Wattmeter is removed. The Model 43 in a 50 ohm line will indicate zero reflection when the load, at its load connector, is 50 ohms, pure resistive.
Chapter 3 Installation Portability The Model 43 is a portable instrument, and the housing is not designed for fixed mounting (see Outline Drawing, page 8). A strap is provided for carrying purposes. While transporting the Thruline Wattmeter, it is best to reinsert the original dust plug, or a Plug-In Element with the arrow pointed upward, in the measuring socket, and secure with the catch.
Bird Model 43 Wattmeter The Model 43 is normally supplied with two Female N type connectors which are of the Bird Quick-Change design. Other QC connectors are available, refer to the Replacement Parts List in the Maintenance Chapter. Follow these steps to change the QC connectors. 1. Remove the four 8-32 pan head machine screws from the corners of the connector flange. 2. Pull the connector straight out. 3.
Installation meter may be used to measure several RF transmission lines without interruption of RF lines for insertion of the Thruline Wattmeter. Additional RF line sections are available (see figure 7). The RF line section of the Model 43 lends itself very readily to panel type mounting. A layout for the panel mount cut is given in figure 8. The thickness of the panel should be about 1/4 inch. On panels less than this, build up the thickness with pads or washers to achieve a flush-face mounting.
Bird Model 43 Wattmeter Figure 7 RF Line Section #10-32 x 9/32 DEEP TAP TWO HOLES PLUG-IN ELEMENT DETERMINES POWER & FREQUENCY RANGE 2-1/8" 1-1/2" 1-1/4" SQUARE J-411 7/8" P-401 D-C CABLE, RG-58/U (W-403) ORIENT TO SUIT 17/64" 1-3/64" 5/8" FEMALE "N" CONNECTORS OR AS OTHERWISE SPECIFIED 3-13/16" 5-1/8" Figure 8 Panel Cut for Mounting RF Body 1/8" Rad or 1/8" x 45° chamfer 2.125 1-17/64 13/64 (.
Chapter 4 Operating Instructions Zero Adjust The meter should be checked for zero set under no power conditions. With no power applied the meter pointer should set exactly on zero. If adjustment is required, turn the adjustment screw until the pointer is set at zero (refer to figure 9). Figure 9 Zero Adjust Zero Adjust Screw WARNING When operating this equipment in conjunction with RF power of 200 watts or higher, the potential of the center conductor of the RF line section will be 100 volts or higher.
Bird Model 43 Wattmeter General Measurements are made by the insertion and operation of the Plug-In Elements. The elements determine the power range to be read on the meter scale, and the major marking (e.g. 50 W, 100 W, etc.) are the full scale power value for the element. Elements are also marked for frequency range. The transmitter frequency must be within the band of the element used. Refer to the Bird Catalog for a large selection of elements.
Operating Instructions Figure 10 Direction of Element To Load To Transmitter Forward Power Measurement To Load To Transmitter Reflected Power Measurement Normal Operation 1. Insert the appropriate element in the socket of the line section. 2. Rotate the element so that the arrow on the nameplate is pointed away from the RF source for forward power and towards the source for reflected power. 3. Turn on the RF source. 4. Read the power level indicated on the appropriate meter scale.
Bird Model 43 Wattmeter conditions, since a good 50 ohm load can be placed at the end of a 50 ohm transmission line of any length without altering conditions at the transmitter. Using the VSWR Nomograph, determine the intersection of the forward and reflected power values. The slanted line passing closest to this point indicates the VSWR. What happens when the load is not well matched, like an antenna with a VSWR of 1.5 or 2.
REFLECTED POWER - WATTS .2 .4 .6 .8 1.0 1.2 2.0 1.8 1.6 1.4 4 6 8 10 12 20 18 16 14 0.5 VSWR= 1.0 1 1.5 2.0 2.5 3.0 Reflected Power Forward Power Reflected Power 1+ Forward Power 10 0 4. 10 0 3. 5 2. 15 0 2. 20 8 1. 5 1. 25 30 6 1. 40 4 1. 50 3 1. FORWARD POWER - WATTS 4.0 5.0 R W VS 25 1. 20 1. 100 16 1. 14 1. 150 12 1. 200 06 1. 300 10 1. .09 1 08 1. 07 1. 400 500 05 1.
28 .01 .02 .03 .04 .05 .06 .1 .09 .08 .07 .2 .3 .4 .5 .6 1.0 .9 .8 .7 0.5 R W VS 1.0 10 0 4. 1.5 0 3. 0 2. 8 1. 2.0 2.5 3.0 5 2. 5 1. 4.0 5.0 6 1. 4 1. 10 25 1. 20 1. 15 16 1. 20 14 1. 09 1. 10 1. 25 30 12 1. 07 1. 40 08 1. 50 06 1. FORWARD POWER - WATTS 3 1. 05 1. 04 1. 100 03 1.
Operating Instructions Figure 13 Cable Wavelength Matching Graph MEGAHERTZ (600) (700) (800) (900) (1000) 36 I N C H E S 32 28 (10) C A B L E 24 (9) L E N G T H 20 (8) 16 (7) 12 (6) 8 (5) 4 (4) I N C H E S 0 100 200 300 400 500 600 700 FREQUENCY (MEGAHERTZ) 29
Bird Model 43 Wattmeter Notes: 1. Physical cable length shown in inches is measured from end to end of outer conductor of connectors (TNC and N Male connectors), except for cables with UHF or MiniUHF plugs where the cable length is measured from tip to tip of the center pins. 2. Dimensions shown are for solid polyethylene cable (e.g. RG-58C/U, RG-8/U) which has 66 percent the velocity of propagation relative to air.
Chapter 5 Maintenance This chapter contains operator maintenance instructions, troubleshooting and parts information. The rugged and simple design of the Model 43 Wattmeter requires minimum routine maintenance. Troubleshooting The following table contains troubleshooting information for problems which can occur during normal operation. Locate the problem, review the possible cause, and perform the corrective action listed. Only those functions within the scope of normal maintenance are listed.
Bird Model 43 Wattmeter Problem Possible Cause No meter indication No RF power “Arrow” on Plug-in element pointing in wrong direction No pick-up from dc contact finger Open or short circuit in dc meter Meter burned out or damaged Intermittent or inconsistent meter readings High VSWR or Reflected Power Sticky or defective meter Dirty dc contact on elements Faulty transmission line or antenna Bad load or poor connectors Shorted or open transmission line Foreign material in line section or in RF connec
Maintenance It is important to keep the following surfaces clean: s s s s Socket bore Element body circumference Bottom rim of the socket in the line section DC contacts on the element The outside surface of the meter housing can be cleaned with a soft cloth dampened with a mild detergent solution. Do not wipe the meter glass with a dry cloth, a static charge could develop causing an erroneous indication on the meter.
Bird Model 43 Wattmeter this part be properly maintained. If the spring finger of the dc contact requires adjustment, it may be done manually if done carefully. The button must be positioned far enough out to maintain good contact with the element, but not so far as to interfere with easy entry of the element body. The dc jack, with spring finger, may be removed for access by: 1. Unscrewing the two 4-40 fillister head machine screws 2.
Maintenance Certainly if the absorption wattmeter has gone for years since its last calibration, or is reasonably suspected of inaccuracy, it may well be calibrated against the Thruline Wattmeter as the standard. Rather than use correction factors, one can, with Termaline Wattmeters, make use of the calibration adjustment screws used in factory calibration. These are concealed and not mentioned in the instruction book to discourage tampering. Consult the factory before changing the adjustment.
Bird Model 43 Wattmeter Connector *Available “QC” Type Connectors Part Number Connector Part Number N-Female N-Male HN-Female HN-Male LC-Female LC-Male BNC-Female BNC-Male SMA-Female SMA-Male 7/8" EIA 4240-062 4240-063 4240-268 4240-278 4240-031 4240-025 4240-125 4240-132 4240-336 4240-334 4240-002 1-5/8" EIA Fixed 7/16" IEC (Jack) Type 169-4 4240-096 4240-344 36 LT-Female LT-Male C-Female C-Male UHF-Female UHF-Male TNC-Female TNC-Male SC-Female Mini UHF-Female 7/16" IEC (Plug) Type 169-4 1-5/8" EIA
Maintenance Figure 14 Exploded View Of The Model 43 37
Bird Model 43 Wattmeter Model 4431 Thruline Wattmeter The Model 4431 RF Sampling Wattmeter is essentially the same as the Model 43 Thruline Wattmeter described in this instruction book except for the extra provision of the adjustable RF signal sampler probe. Theory of Operation The RF sampler, as its name implies, provides a low level signal or sample of the energy being transmitted through the line section of the wattmeter.
Maintenance Table 1 Model 4431 Coupling Data Maximum Frequency (MHz) Sensitivity (Fully Clockwise) 2 69 10 57 25 46 50 42 75 39 100 36 200 31 Counterclockwise 4 Full Turns 7 Full Turns From Max. From Max. Position Position (Approximate dB (Approximate dB attenuation) attenuation) 300 38 400 34 500 30 600 29.5 700 29 800 28.5 36 900 28 35.5 1000 35 Note: It is important to decouple the RF sampler as indicated above for frequencies above 200 MHz.
Bird Model 43 Wattmeter Operation The basic operations and maintenance procedures for the Model 4431 are the same as those of the Model 43 as described in this instruction book. Maintenance The maintenance procedures for this model are essentially the same as for the Model 43 except for the inclusion of the variable probe equipment. It is not recommended that user make repairs on the probe assembly. If the sampler malfunctions, we suggest the unit be returned to the factory.
Maintenance 7. The sampler cable (RG-58/U) solid wire center conductor is soldered to the rear stub of the probe piece itself. The cable is secured to the side sleeve of the probe with the same washer and screw parts used in the dc connector plug assembly, P/N 7500-076. It may be removed by unscrewing the threaded sleeve washer, 3/8 hex head, unsoldering the lead tip and pulling out the cable. The probe assembly is formed into the socket and is not replaceable. 8.
Bird Model 43 Wattmeter Series 4520 Thruline Wattmeters The Series 4520 RF Thruline Wattmeter units are essentially the same as the Model 43 Wattmeter, in that their electrical components and performance characteristics are alike. These models are panel mounted for rack-type installation instead of the all purpose portable housing of the Model 43 Wattmeter.
Maintenance Theory of Operation, Operating Instructions and Maintenance Sections Although the physical configuration of these models is different, the provisions in these sections of the Model 43 Instruction Book are fully applicable. The Model 4527 is electrically identical to the Model 43 in every way except for having an RF sampler port. The RF sampler port provides a low level signal or sample of the energy being transmitted through the line section of the wattmeter.
Bird Model 43 Wattmeter Item Qty. 4 1 2 5 1 1 1 2 1 1 6 7 8 9 1 1 1 1 2 1 10 Description DC connector assembly Model 4521/23/25 Model 4522/26/27 Microammeter Model 4521/22/27 Model 4523 Model 4525 Model 4526 Switch control knob (Model 4522 only) Plug connector Model 4521/23/25 Model 4522/26/27 Rotary Switch (Model 4522 only) Cable assembly Model 4521/25 (16"L) Model 4522 (Harness) Model 4523 (16.
Maintenance 2. The line section has higher power capability and is larger, being 1-5/8 inch in diameter instead of 15/16 inch as in the Model 43, but this is not externally visible. The Theory of Operation, and Maintenance Sections for the Model 43 are all appropriate to the Model 4305A except for changes mentioned previously. The Model 4305A Thruline Wattmeter does not have provisions for holding spare elements in the sides of the housing.
Bird Model 43 Wattmeter To maintain accuracy, it is important to have operating frequencies within those stated. The elements for the Model 4330 have a dual power range. The slide switch on the face of the element is moved sideways to select either 800 mW or 200 mW full scale deflection as indicated by the element nameplate. The scales on the meter dial coincide with the position selected. For protection of the meter, always select the higher value first.
Maintenance Model 43P Specifications RF Frequency Range RF Power Rating Accuracy 0.450-2700 MHz. depending on element selected. 100 mW to 10kW, depending on element selected. CW mode ±5% of full scale Peak mode ±8% of full scale When measuring rectangular pulse power, the following parameters must be observed: Duty cycle - 2% minimum Rep. rate - 100 pps minimum Pulse width - 200 µsec.
Bird Model 43 Wattmeter will also be noticed upon transmitter de-energization as the meter needle sweeps back to zero. Also, the meter reading may be expected to waver approximately 2-3 minor scale divisions when voice modulation is used as the peak detector attempts to follow peak power variations associated with voice modulation. Model 43P Peak Calibration If it is felt that the peak readings are questionable, or for any reason recalibration is required, proceed as described.
Maintenance the CW reading. When the CW and PEAK readings are the same, calibration is complete. 9. Replace the back cover, using the four 8-32 Phillips flat head screws. Maintenance Maintenance of the Model 43P in general will be the same as for the Model 43 except for battery replacement. If the unit does not function properly in peak mode, or calibration cannot be achieved, the batteries may be low. Replace the batteries with new ones, preferably alkaline or lithium type.
Bird Model 43 Wattmeter Customer Service Any maintenance or service procedure beyond the scope of those provided in this section should be referred to a qualified service center. Bird Electronic Corporation maintains a complete repair and calibration facility at the following address. Service Group U.S.A.
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.
DECLARATION OF CONFORMITY Manufacturer: Bird Electronic Corporation 30303 Aurora Road Cleveland, Ohio 44139-2794 Product: Thruline RF Directional Wattmeters Models: 43 4305A 4431 4521 4523 4525 43P 4522 4526 4330 4527 The undersigned hereby declares, on behalf of Bird Electronic Corporation of Cleveland, Ohio, that the above-referenced product, to which this declaration relates, is in conformity with the provisions of the following standards; 1. 2. European Standard EN 55011:1991 - Emissions: Class B.