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Typical Configuration
1
Instrument
Definition
1
Programming the
RF Multiplexer
Chapter 1
In the remainder of this manual, channels are referred to as n0 through n3 and Com
n0, where n is the bank number (0 through 5). Each channel is switched (connected
to its common) by closing the appropriate (nonlatching) relays. Channels n0
through n3 can be switched to Com n0 for all banks. Only one channel in each
bank can be connected to its common at a time.
User inputs/outputs to each channel are via SMB connectors. When a channel is
CLOSed, it is internally connected to the COMmon connector. When a channel is
open, it is internally disconnected. Open channels are not terminated. At
power-off, power-on, or reset, channel n0 is switched to the COM n0 connector,
and all other channels (n1 through n3) are open (non-terminated) for all banks.
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 (42 V peak). User input frequencies
to the 50 Ω RF Multiplexer and Expander modules can be from DC to 3 GHz. User
input frequencies to the 75 Ω 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 3 for more information).
For a SCPI (Standard Commands for Programmable Instruments) 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.
HP plug-in modules installed in an HP mainframe or used with an HP command
module are treated as independent instruments each having a unique secondary
HP-IB 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).
To program the RF Multiplexer using SCPI, you must select the controller
language, interface address, and SCPI commands to be used. Guidelines to select
SCPI commands for the RF Multiplexer follow. Refer to your specific
HP Control Module Manual for interface addressing and controller language
information.
Getting Started 11
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