12 Getting Started
Chapter 1
Typical
Configuration
The RF Multiplexer and Expander relays are configured in a “tree” structure
which provides high isolation and low VSWR (voltage standing wave ratio).
Each channel can switch user inputs up to 24 Watts (42V peak). User input
frequencies to the 50 Ohm RF Multiplexer and Expander modules can be
from DC to 3 GHz. User input frequencies to the 75 Ohm RF Multiplexer and
Expander modules can be from DC to 1.3 GHz.The RF Multiplexer can be
configured for several arrangements, such as standard, tree, or matrix (see
Chapter 4 for more information).
For a Standard Commands for Programmable Instruments (SCPI)
environment, one or more RF Multiplexers (with or without Expanders
connected) can be defined as a switchbox instrument. For a switchbox
instrument, all RF Multiplexer channels within the instrument can be
addressed using a single interface address.
Instrument
Definition
Plug-in modules installed in a mainframe or used with a command module
are treated as independent instruments each having a unique secondary
GPIB address. Each instrument is also assigned a dedicated error queue,
input and output buffers, status registers and, if applicable, dedicated
mainframe/command module memory space for readings or data. An
instrument may be composed of a single plug-in module (such as a counter)
or multiple plug-in modules (for a Switchbox or Scanning Voltmeter
Instrument).
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