Product Description - Agilent Technologies E8285A Manual

Introduction

Product Description

Product Description
The E8285A CDMA Mobile Test Set is designed to meet the needs of
Cellular Provider Point of Sale Retailers, manufacturing customers,
and other customers who require CDMA Mobile Phone test capability.
The Test Set is very similar to it's predecessor, the Agilent Technologies
8924C with the addition of newly designed RF I/O module, upconverter
and downconverter assemblies. These assemblies extend the Test Set
frequency range to cover the 1800-1900 MHz PCS Cellular band as well
as providing standard 800 MHz cellular band coverage.
Internal Operating System
A Motorola® 68020 − 33 MHz microprocessor acts as the host processor
of the Test Set. It receives commands from the front-panel controls and
communicates directly with almost every assembly inside the Test Set.
The host is also in constant communication with several other
microprocessors located throughout the Test Set.
Communications to the GPIB, serial, and parallel ports are through the
control interface assembly to the host processor.
This processor is also the core for the internal IBASIC computer. The
IBASIC computer is used to load and run various software packages for
automated radio tests. It is also responsible for executing the internal
diagnostic routines used to troubleshoot a failing instrument.
Instrument Frequency References
The Test Set reference timebase path consists of two assemblies, an
ovenized high stability reference assembly and a CDMA reference
assembly. These two assemblies provide all frequency, phase, and
timing signals used to accurately synthesize all of the Test Set's source
and analysis signals. A master reference signal can originate from
either an external source at the 10 MHz input on the rear panel, or
from the internal 10 MHz phase locked loop oscillator located on the
high stability reference assembly. The high stability reference assembly
provides timebase references for the analog assemblies and a 10 MHz
reference signal to the CDMA reference assembly. The CDMA reference
assembly uses this signal to generate clock and timing signals for
internal CDMA assemblies, provide the 10 MHz output signal to the
rear panel, and generate the AWGN (Additive White Gaussian Noise) I
& Q noise source signals.
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