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INSTRUCTION BOOK

OPERATING INSTRUCTIONS

WITH

PARTS LIST

WATTCHER® MONITOR/ALARM

MODELS

3126A, 3127A, & 3128A

Instruction Book Part Number 920-3126/27/28A Revision A

Thruline® and Wattcher® are registered trademarks of Bird Electronic Corporation

Summary of Contents for Wattcher 3126A

Page 1: ...TH PARTS LIST WATTCHER MONITOR ALARM MODELS 3126A 3127A 3128A Copyright 1996 by Bird Electronic Corporation Instruction Book Part Number 920 3126 27 28A Revision A Thruline and Wattcher are registered...

Page 2: ...for amounts so expended by Buyer Every such claim for breach of these warranties shall be deemed to be waived by Buyer unless made in writing within ten 10 days from the date of discovery of the defe...

Page 3: ...he 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 supplie...

Page 4: ...hazard 3126A 27A 28A 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 Be sure voltage sel...

Page 5: ...uctions necessary to operate the equipment are contained in this section Maintenance All personnel should be familiar with preventive maintenance found in Chapter 5 Maintenance If a failure should occ...

Page 6: ...eory of Operation 11 Chapter 3 Installation 15 Items Required 15 Chapter 4 Operations 17 General 17 Zero Adjust 17 Alarm Enable Disable 17 Fail Safe Non Fail Safe Mode 17 Adjusting Reflected Power Tri...

Page 7: ...for the protection and monitoring of radio frequency transmission systems The line section is selected to be compatible with the RF coaxial line used in the transmission system The elements are selec...

Page 8: ...ch Alarms Audible buzzer and visual front panel LED Alarm Actuation Time 50ms typical Finish Light navy gray powder coat Nominal Size 19 X 5 7 32 X 3 3 4 483 X 133 X 95 mm Weight 5 lb 2 28kg Power 115...

Page 9: ...e LED Green LED when illuminated the alarm is active power is on 4 RFL Alarm LED Red LED flashes when the reflected power trip level has been exceeded for more than 50ms 5 Reset Push button Resets the...

Page 10: ...n for interlock one 8 COM1 Common Connection for interlock one 9 NC1 Normally closed connection for interlock one 10 NO2 Normally open connection for interlock two 11 COM2 Common Connection for interl...

Page 11: ...direction in which it is sensing the RF power flow in the system Traveling Wave Viewpoint The best way to visualize the Thruline Wattmeter idea is from the Traveling Wave viewpoint on transmission lin...

Page 12: ...ition with a spring loaded clasp to keep the element firmly seated The machined step on the top face of the socket engages a stop pin on the element Rotary movement of the element is thereby restricte...

Page 13: ...e Since there are definite simple relationships between standing wave ratio and the reflected for ward power ratio indicated by the Thruline Wattmeter the latter may be conveniently used to measure VS...

Page 14: ...Bird Models 3126A 3127A 3128A Wattcher RF Monitor Alarm 14...

Page 15: ...ling kit is required for connecting the line section to the transmission line The coupling kit will be similar to one of the coupling kits shown below Review the following and refer to the diagram to...

Page 16: ...d power sensor cables Forward power sensor cable from port A of the line section Reflected power sensor cable from port B of the line section 7 AC line voltage selector switch is in the appropriate po...

Page 17: ...e mode An interlock active condition can be caused by exceeding reflected power trip value or if the Wattcher Unit is not operating Adjusting Reflected Power Trip Level Ensure that the plug in element...

Page 18: ...ll scale value shown on the element cap determines the power scale to be read Alarm Condition If the reflected power reading reaches the trip level for longer than 50ms the buzzer will sound if enable...

Page 19: ...VSWR Conversion Nomograph Chapter 4 Operations 19...

Page 20: ...VSWR Conversion Nomograph 20...

Page 21: ...n the measuring positions Any additional elements should be well padded and wrapped before being put in the shipping container Line Section Wrap the connectors on the flanged models with padding and t...

Page 22: ...or short circuit in dc cable Replace defective dc meter cable RG 58 U Meter burned out or damaged Return Wattcher line section and elements to the factory for meter replacement and calibration Intermi...

Page 23: ...al health hazard Inspection Inspect the Wattcher Unit cleanliness proper adjustment and with the RF power removed check the ZERO setting and adjust if necessary Preventive Maintenance The element sock...

Page 24: ...maintained If the spring finger of the dc contact requires adjustment it may be done manually if carried out with care The tip must be positioned far enough out to maintain good contact with the elem...

Page 25: ...ransformer 5A2309 8 1 AC power input receptacle 5A2297 1 J4 Remote terminal plug connector 4 contacts 5A2075 4 1 J5 Interlock terminal plug connector 6 contacts 5A2075 6 2 J1 J2 BNC connectors 5A2319...

Page 26: ...Record model and serial numbers located on back panel MODEL NUMBER SERIAL NUMBER Bird Models 3126A 3127A 3128A Wattcher RF Monitor Alarm 26...

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