Line Voltage and Fuse Selection..................................................................................... 2-5
PREPARATION FOR RESHIPMENT OR STORAGE ..................................................................2-8
Reshipment...................................................................................................................... 2-8
Storage............................................................................................................................. 2-9
SECTION III
THEORY AND OPERATION
GENERAL
..............................................................................................................................3-1
OPERATION ...............................................................................................................................3-1
GENERAL OPERATING CONSIDERATIONS.............................................................................. 3-2
CONTROLS AND INDICATORS ...................................................................................................3-2
LISTEN Indicator.............................................................................................................. 3-3
REMOTE Indicator............................................................................................................3-3
STANDBY Indicator.......................................................................................................... 3-3
POWER Switch................................................................................................................ 3-3
ON Indicator..................................................................................................................... 3-3
DC SUBSTITUTED POWER Switch............................................................................... 3-3
RF ON Indicator............................................................................................................... 3-3
BRIDGE BALANCE Meter............................................................................................... 3-3
RF OFF Indicator..............................................................................................................3-4
FINE NULL ADJUST Control........................................................................................... 3-4
COARSE NULL ADJUST Control.................................................................................... 3-4
ERROR Indicator............................................................................................................. 3-4
RF ON/OFF Switch...........................................................................................................3-4
TEMPERATURE Meter.....................................................................................................3-4
ADDRESS Switch............................................................................................................ 3-4
OPERATING INSTRUCTIONS..................................................................................................... 3-5
Initial Powerup and Checkout.......................................................................................... 3-5
Manual Operation............................................................................................................ 3-6
REMOTE OPERATION.................................................................................................... 3-7
TERMINATING OPERATION........................................................................................... 3-8
THEORY OF OPERATION ...........................................................................................................3-8
Power Supply/Motherboard Section................................................................................ 3-8
Microprocessor Section................................................................................................... 3-9
RF Amplifier Section...................................................................................................... 3-11
Thermistor Mount Proportional Temperature Controller................................... 3-11
Bridge Offset Sensing Circuit............................................................................ 3-12
RF Switching Circuitry....................................................................................... 3-12
DC Substitution Section................................................................................................. 3-12
CALIBRATION............................................................................................................................. 3-13
DC Substitution.............................................................................................................. 3-13
Calibration Factors......................................................................................................... 3-13
Sources of Calibration Error........................................................................................... 3-14
Calibration Factor in dB................................................................................................. 3-14
SECTION IV
TESTING
GENERAL
..............................................................................................................................4-1
MAINTENANCE ............................................................................................................................4-1
Inspection................................................................ ........................................................ 4-1
Preventive Maintenance.................................................................................................. 4-1
Connectors................................................................................................................. 4-1
Calibration Data Record .............................................................................................4-1
Special Cleaning Instructions........................................................................................... 4-1
iv
