AR 10052381, Operating And Service Manual

Page: 17 / 60

Rev A 1
1. GENERAL INFORMATION
1.1 GENERAL DESCRIPTION
The Model 125W1000A is a self-contained, broadband microwave 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
10 decibels (dB) or more. Solid state technology is used exclusively to offer significant advantages in reliability
and cost. A Model 125W1000A, used with a frequency-swept signal source, will provide 125 watts of swept
power output from 1–6 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 125W1000A 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.
1.2 POWER SUPPLIES
The Model 125W1000A contains three switching power supplies. The input voltage range to the power supplies
is 100–240 VAC, 50/60Hz, selected automatically.
PS1 is a single output supply. +5V and -15V is fed to the A6 Regulator Assembly. +24VDC is for operating
the cooling fans B1-B3. Primary AC circuit protection is provided by the AC fuses in the Power Entry Module
FL1.
PS2 is a single output supply. The main +27.0 volts DC supplies voltage to the Drain FETs in the A1 Preamp
and A2 Final Amplifiers.
PS3 is a multiple output supply. +5V is supplied to the A7 control panel assembly. -15V is supplied to the A6
Regulator Assy. and A1 Preamp Assy.
1.3 SPECIFICATIONS
Refer to the AR Data Sheet at the end of this section for detailed specifications. All voltage measurements
referenced in this manual are Direct Current (DC) unless stated otherwise.
1.4 INSTALLATION
Before proceeding, thoroughly inspect the amplifier for signs of physical damage that may have been incurred
during shipment and completely read the following installation and operating instructions, paying special
attention to all CAUTION notes.
1.4.1 Location
Select an operating location that will permit air to circulate freely around the amplifier’s cabinet. The
Model 125W1000A utilizes air cooling and should be located where the normal flow of air into or exiting from
the unit will not be restricted, diverted, or re-circulated through the unit itself; in particular, the flow of warm
air exiting the rear of the amplifier should not be impeded.