AR 10047590, Operating And Service Manual

Page: 17 / 54

Rev A 1
1. GENERAL INFORMATION
1.1 GENERAL DESCRIPTION
The Model 125S1G2z5 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 125S1G2z5, used with a frequency-swept signal source, will provide 125 watts
of swept power output from 1.0–2.5 gigahertz (GHz). 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 125S1G2z5 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 125S1G2z5 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 125S1G2z5 contains two switching power supplies. The input voltage range to the power supply
is 100–240 VAC, 50/60Hz, selected automatically. The AC input power is approximately 650 watts.
PS1 is a multiple output supply. PS1 has a +5 volt, standby supply for the A12 Control/Fault board and the
A14 Interface board used for the remote interfaces. The -15V is supplied to the A1 Pre-Amp and the A9
Regulator Assembly. The A9 Regulator Assembly feeds -8V to the A2 Driver Module and the A6 – A7 Final
Modules. The +24V is supplied to the B1 and B2 Fan Assemblies.
PS2 su28V to the A1 Preamp, A2 Driver Module and the A6, A7 Final Modules.
Primary AC circuit protection is provided by the circuit breaker in the Power Entry Module.