INSTRUCTION BOOK OPERATING INSTRUCTIONS SERIES 6730B TERMALINE® WATTMETER Electronic Corporation Cleveland (Solon) Ohio USA © Copyright 1997 by Bird Electronic Corporation Instruction Book Part Number 920-6730B Rev.
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.
SAFETY PRECAUTIONS The following are general safety precautions that are not necessarily related to any specific part or procedure and do not necessarily appear elsewhere in this publication. These precautions must be thoroughly understood and apply to all phases of operation and maintenance. KEEP AWAY FROM LIVE CIRCUITS Operating personnel must at all times observe normal safety regulations.
RESUSCITATION Personnel working with or near high voltages should be familiar with modern methods of resuscitation. Such information may be obtained from the Bureau of Medicine and Surgery. 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.
6730B 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 Model 6735-300A is rated for 1200 W operation for a maximum of ½ hour only. For continuous operation, the maximum wattage should be restricted to 1000 W. It is recommended that if frequent use above 1000 W is contemplated, the instrument be equipped with the thermoswitch assembly.
About This Manual This instruction book covers the models 6732B, 6734B, 6734B-030, 6735-300A, 6736A, 6736-030A, 6737A, and 6737-030A Termaline Wattmeter. This instruction book is arranged so that essential information on safety is contained in the front of the book. Reading the Safety Precautions Section before operating the equipment is strongly advised. The remainder of this Instruction Book is divided into Chapters and Sections.
TABLE OF CONTENTS Safety Precautions . . . . . . . . . . . . . . . . . . . . . . i Warning Statements . . . . . . . . . . . . . . . . . . . . ii Caution Statements . . . . . . . . . . . . . . . . . . . . iii About This Manual . . . . . . . . . . . . . . . . . . . . . iv Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 1 Purpose and Function . . . . . . . . . . . . . . . . . . . 1 Dimensions and Weight . . . . . . . . . . . . . . . . . . 1 Power and Utility Requirements . . . . . . . . . . .
Operation Under Emergency, Adverse, or Abnormal Conditions . 14 Shutdown . . . . . . . . . . . . . . . . . . . . . . . . 14 Emergency Shutdown . . . . . . . . . . . . . . . . . . . 14 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 15 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . 15 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Outside Surfaces . . . . . . . . . . . . . . . . . . . . . 16 Radiator. . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 Introduction This instruction book is intended for use by operators of the Models 6732B, 6734B, 6734B030, 6735-300A, 6736A, 6736-030A, 6737A, and 6737-030A Termaline Wattmeter. This chapter contains introductory information including product specifications, items supplied, and accessory items available. Purpose and Function A Series 6730B Termaline Wattmeter is a portable direct reading absorption wattmeter that both measures and dissipates RF power.
Bird Model 6730B Series Termaline Wattmeter Environmental Requirements These wattmeters should be operated in a dust and vibration free environment. The ambient temperature range should remain between -40°C and +45°C (-40°F and +113°F) for proper operation. Allow at least 6 inches (150 mm) of clearance around the units to permit unimpeded access of natural air convection currents for adequate heat dissipation.
Introduction Specifications Impedance 50 ohms nominal VSWR 6734B030, 6736-030A 6737-030A 1.10:1.00 max. dc - 35MHz 6734B, 6736A, 6735-300A, 6737A 6732B 1.15:1.00 max. dc - 1000MHz 1.15:1.00 max. dc - 800MHz 1.20:1.00 max. 800 - 1000MHz Accuracy 6734B030 ± 5% of full scale 2 - 32MHz 6736-030A ± 5% of full scale 2 - 30MHz ± 10% of full scale 1.5 - 2MHz 30 - 32MHz ± 5% of full scale 2 - 32MHz ± 10% of full scale 1.
4 500 500 1200* 1000 1000 200/500/2500** 100/500/2500 200/500/2500** 100/500/2500 6734B 6734B030 6735-300A 6736A 6736-030A 6737A 6737-030A 1.5-35 25-1000 1.5-35 25-1000 25-1000 1.5-35 25-1000 25-1000 LC-F LC-F LC-F LC-F LC-F N-F N-F N-F Conn.
Chapter 2 Principles of Operation The Termaline Wattmeter circuit is basically a voltage capacitive divider with one of the capacitors being a probe whose distance from the center conductor determines its capacitive value. This probe spacing is adjusted at the factory in the calibration procedure to produce the required value and is then locked in place. The small voltage developed across the fixed capacitor is rectified by a diode.
Bird Model 6730B Series Termaline Wattmeter CAUTION Model 6735-300A is rated for 1200 W operation for a maximum of ½ hour only. For continuous operation, the maximum wattage should be restricted to 1000 W. It is recommended that if frequent use above 1000 W is contemplated, the instrument be equipped with the thermoswitch assembly. As an optional item, the Model 6735-300A load portion can be provided with a thermoswitch assembly, P/N 2450-056.
Principles of Operation Figure 1 Schematic Diagram for Models 6734B030, 6736-030A, and 6737-030A Off 500W 100W 25W M 50 Ohm Input 50 Ohm Load Note - Power ranges shown are for Model 6734B-030.
Principles of Operation Figure 2 Schematic Diagram for Models 6732B, 6734B, 6735-300A, 6736A, and 6737A Off 500W 100W 25W M 50 Ohm Input 50 Ohm Load Note - Power ranges shown are for Model 6734B.
Installation Operate the load portion in the horizontal position only, with the handle or vent plug on top. The only exceptions are the Models 6737A and 6737-030A. When horizontally mounted and without supplemental water cooling, these loads will safely dissipate a maximum of 500 watts. Vertically mounted and without supplemental water cooling, they will dissipate 200 watts. Vertically mounted, with the RF connector down and with water cooling, they will dissipate up to 2500 watts continuously.
Bird Model 6730B Series Termaline Wattmeter heated coolant rises by more than a few pounds above atmospheric pressure. By this means, the pressure is relieved while at the same time foreign materials are prevented from entering the tank and contaminating the dielectric coolant. When these wattmeters leave the factory, the vent opening is sealed with a shipping plug which is attached to the vent plug by a length of beaded chain.
Installation Figure 3 Thermoswitch A D F C E H B G 1. Stand the unit on its back end with the connector end up. In this position there is no danger of coolant spillage. 2. Use a 9/16 allen wrench to remove the socket plug on the front face of the radiator. Do this carefully to avoid damaging the threads in the plug hole. 3. Replace the plug with the thermoswitch. Use an acceptable pipe sealing compound, “Locktite with Teflon” or equivalent, sparingly on the external threads only.
Bird Model 6730B Series Termaline Wattmeter (H) on the cable. Push the plug back on the thermoswitch and tighten the captive knurled connecting ring. Do not attempt to operate the equipment without interlocking it with the transmitter or RF source. Locate the load portion to provide at least six inches of free space around and above the unit. Place the load so that the shortest possible cable length connects it to the transmitting equipment.
Chapter 3 Operating Instructions Controls The only operating control is the range selector switch on the lower right hand face of the meter unit. No adjustment or control settings are required. Start-Up Connect the load to the transmitting equipment under test with 50 ohm coaxial cable (RG-8A/U, RG-9/U, RG-213/U or equal) equipped with a Male N type plug (UG-21E/U or equal) which mates with the RF input connector of the load for Models 6732B, 6734B and 6734B-030.
Bird Model 6730B Series Termaline Wattmeter Operation Under Emergency, Adverse, or Abnormal Conditions The loads of the Series 6700A/B Termaline Wattmeters will withstand a temporary overload of up to 20 percent above their nominal maximum rating. The overload should be applied for no more than five to ten minutes. Allow at least a half-hour of cooling thereafter before subjecting the unit to another overload. For Models 6737A and 6737-030A, increase the water flow rate for extra protection.
Chapter 5 Maintenance Troubleshooting For corrections requiring repair or replacement of components, refer to the appropriate section for your specific model.
Bird Model 6730B Series Termaline Wattmeter Cleaning Outside Surfaces The outside surface of these wattmeters should be wiped free of dust and dirt when necessary. The principle maintenance required by the operator will be to periodically wipe the accumulated dust and lint off of the radiator fins. Excessive dust and lint on the cooling fins will interfere with the efficient dissipation of heat.
Maintenance the load when its temperature is between 20 and 25 degrees Celsius. Check and record the dc resistance value of the load before it is put into service. Use a resistance bridge or ohmmeter with an accuracy of 1 percent or better at 50 ohms for this purpose. If the wattmeter is used frequently, daily to weekly, it is recommended to check the dc resistance on a monthly schedule. If the wattmeter is used more infrequently you may want to set up a six month to yearly schedule accordingly.
Bird Model 6730B Series Termaline Wattmeter Diaphragm and Coolant Oil Remove the diaphragm to replace or examine the coolant oil. For replacement of the diaphragm and coolant oil follow the steps below for the appropriate model. CAUTION Do not replace coolant with anything but the specified fluid. The inner shell of the resistor housing is contoured to the dielectric properties of this fluid. The use of any other type of coolant will affect the electrical performance of the load.
Maintenance gallons (11 liter) of a specially selected dielectric fluid (P/N 5-030). The level of the fluid should remain constant, even after prolonged usage, under normal operating conditions. Models 6736A and 6736-030A; 1. To check the coolant level, remove the vent plug from the top rear surface of the expansion tank. 2. Unscrew the plug with a 3/4 wrench. The coolant level at room temperature should be no more than 1/8 inch above the bottom surface of the expansion tank.
Bird Model 6730B Series Termaline Wattmeter 2. Loosen the clamp screw until the clamping band is released. 3. Hold the load assembly by the RF connector and pull the assembly slowly out of the radiator tank allowing the excess coolant to drain back into the radiator. 4. Inspect the O-Ring seal which is located just inside the mounting flange of the radiator assembly. Do not reuse the O-Ring if it is no longer soft and pliable or shows signs of surface cracks. 5.
Maintenance Models 6736A and 6736-030A; 1. Replace the vent plug, P/N 2450-094, with the shipping plug, P/N 2450-049. Make sure to use the O-Ring seal to avoid leakage. 2. Stand the unit on its back end, with the connector up, and brace it if necessary to prevent it from tipping over. 3. Loosen the 10-32 x 1-1/2 inch screw on the clamping band and remove the clamping band. 4.
Bird Model 6730B Series Termaline Wattmeter Model 6735-300A 1. Replace the load assembly and the clamping band. 2. Tighten the clamping screw. 3. Carefully lower the load back onto its feet. Model 6736A and 6736-030A Reverse disassembly procedure. RF Load Resistor Reverse disassembly procedure. Storage No special preparations for storage are necessary other than to cover the equipment to keep out dust and dirt.
Maintenance 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 complete repair and calibration facilities at the following addresses: Service Group U.S.A.
Bird Model 6730B Series Termaline Wattmeter Series 6730B Replacement Parts List Item 1 2 3 4 5 Qty.
Maintenance Item 27 28 29 Qty. 1 1 1 Description O-Ring seal Back cover assembly Radiator handle MODEL 6735-300A 1 30 Meter 1 31 RF load resistor 1 32 O-Ring, RF section 1 33 Clamping band assembly 1 34 Breather vent plug 1 35 Shipping plug 2 36 O-Ring, vent/shipping plug 1 37 Thermoswitch assembly, overtemperature 38 2.
Bird Model 6730B Series Termaline Wattmeter Item Qty. Description 57 0.9 gallon (3.
DECLARATION OF CONFORMITY Manufacturer: Bird Electronic Corporation 30303 Aurora Road Cleveland, Ohio 44139-2794 Product: Termaline Absorption Wattmeter Models: 6732B 6736A 6734B 6736-030A 6734B030 6737A 6735-300A 6737-030A 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.
