AR 500A250D, Руководство по эксплуатации и обслуживанию

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Rev A 1
1. GENERAL INFORMATION
1.1 GENERAL DESCRIPTION
The Model 500A250D is a self-contained, broadband solid-state amplifier designed for laboratory
applications where instantaneous bandwidth, high gain, and moderate power output are required. A GAIN
control, which is conveniently located on the unit’s front panel, can be used to decrease the amplifier’s gain
by 20 decibels (dB) or more. Solid state technology is used exclusively to offer significant advantages in
reliability and cost. A Model 500A250D, used with a frequency-swept signal source, will provide 500 watts
of swept power output from .01–250 megahertz (MHz). Typical applications include antenna and component
testing, wattmeter calibration, and electromagnetic interference (EMI) susceptibility testing, as well as usage
as a driver for frequency multipliers and high-power amplifiers. The Model 500A250D can be operated
locally by using the unit’s front panel controls, or remotely by using the unit’s IEEE-488, RS-232 interface,
USB, or Ethernet interface.
Special features incorporated into the Model 500A250D include the following:
• A Control Panel that allows both local and remote (via a computer interface) control of the amplifier
(including adjustment of the amplifier’s RF Gain during CW mode operation) and provides graphical
displays of the amplifier’s Forward and Reflected power levels.
•
A General Purpose Interface Bus (GPIB)/IEEE-488.2 interface for remote control of the amplifier’s
operating functions.
•
RS232 serial communications including both wire and fiber-optic ports for remote control.
•
USB Communication port
for remote control.
• Ethernet Communication port for remote control.
•
Protection is provided by DC current limiting, over-temperature shut down and RF power limiting.
1.2 SPECIFICATIONS
Refer to the AR RF/Microwave Instrumentation Data Sheet at the end of this section for detailed
specifications.
1.3 POWER SUPPLIES
The Model 500A250D contains three switching power supplies. The input voltage range to the power supply
is 200–240 VAC, 50/60Hz. The AC input power is approximately 2400 watts.
PS1 is a multiple output supply. PS1 has a +5 volt, standby supply for the A18 control panel and the A20
Interface board used for the remote interfaces. The -15V is supplied to the A1 preamp, the A2 driver module
and the A6, A8, A9, A10, A12, A13 final modules. The +24V is supplied to the B2 through B5 fan
assemblies and the combiner fan assemblies. The +15V is supplied to the A2 driver module and the A6, A8,
A9, A10, A12, A13 final modules.
PS2 su34V to the A2 driver module and the A10, A12, A13 final modules.
PS3 su34V to the A6, A8, A9 final modules. PS3 also su34V to the A28 Regulator Board
which in turn supplies a regulated voltage of +24V for the A1 preamp.
Primary AC circuit protection is provided by the circuit breaker in the Power Entry Module.