Operating Information
2715 Spectrum Analyzer Service Manual 2-3
Instrument Construction
Modular construction provides ready access to the major circuits. Each circuit
board containing RF sensitive circuits is mountedin a casting, with feed through
connectors through the compartmentwalls. Most boards and assemblies plug
onto a common interconnect board.Most adjustments and test points are
accessible while the instrum ent is operational and without need of a circuit board
extender.
Circuit board extenders areavailable in an optional Service Kit (see Maintenance
section under Fixturesand Tools for Maintenance on page 6--3).Most of the
modules or boards can be removedwithout affecting the structural or functional
integrity of other modules. The extender board allows any of the six circuit board
assemblies in the card cageto be positioned for service or adjustment. The
Sweep and Power Supply circuit boards areaccessed b y removing the instru-
ment’scabinet (and the Variable Resolution assembly in the case of the Power
Supply).
All other circuit boards are accessi ble by removing the instrument’s cabinet and
the shielding associated with each as sembly.
NOTE. Disassembly of some modules may requirespecial tools and procedures.
These proceduresand a list of tools are located in the Maintenance section.
Most RF circuits are isolated in shieldedcompartments to obtain and maintain
the frequency stability,sensitivity, and EMI characteristics.While shielding
helps ensure a spurious freeresponse, the closeness of the circuits reduces losses
and interactions with other functions.Interconnections between compartments
are made by feedthrough terminals rather than cables. If the compartments are
opened, be sure that the shields are properly reinstalledbefore operating.
Installation and Preparation for Use
Referto Section 2: Getting Started of the 2715 Spectrum Analyzer User Manual
for unpacking, storage, repackagingfor shipment, and installation information.
Power Cord
The power cord that is supplied with theinstrument depends on the available
power source (see Section 1: Specifications). Power cord options are described in
Section F: Options.