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RF Multiplexer Modules Description
RF Multiplexer
Module Block
Diagram
Chapter 1
The Agilent E8482A/B RF Multiplexer module is a single-slot VXIbus
C-Size register-based product which can operate in a C-Size VXIbus
mainframe. It is supplied with an E1406A command module driver and a
VXIplug&play driver. These drivers make the E8482A/B appear as an
"instrument" in the slot of a VXIbus mainframe. Each module is assigned an
error queue, input and output buffers, and a status register.
NOTE
Instruments are based on the logical addresses of the plug-in modules. See
Agilent E8482A/B Six/Three 1x4 RF Multiplexer Module User's Manual to
set the logical address (factory setting is 120) for the RF multiplexer
module to create an instrument.
As shown in Figure 1-3, the E8482A consists of six banks of channels
(banks 0 - 5) to form six 1x4 RF multiplexers, while the E8482B consists of
three banks of channels (banks 0 - 2) to form three 1x4 RF multiplexers. The
switching sections of each bank are identical.
Each channel in a bank is connected to its COM by closing the appropriate
(non-latching) relays. Only one channel in each bank can be connected to its
COM at a time. Channels are referred as n0 through n3 and COM n0, where
n is the bank number (n = 0-5 for E8482A and n = 0-2 for E8482B). User
inputs/outputs to any module use 50
power-on, or following a reset, the first channel in each bank is connected to
its COM. That is, channel n0 is connected to the COM n0 connector, and all
other channels (n1 through n3) in each bank are open (non-terminated).
In addition, the E8482A/B RF Multiplexer module can control up to two
additional expander modules. The expander modules can be either the
E1473A 50 RF Multiplexer Expander module or the E1475A 75 RF
Multiplexer Expander module. The Expander modules can be inserted in the
C-Size mainframe next to the RF Multiplexer module, or can be located up
to eight meters away from the RF multiplexer module using remote
expander cables. Locating the expander module close to the external device
keeps connecting cable lengths to a minimum, thereby reducing the
possibility of crosstalk and insertion loss of high frequency signals. See
Agilent E8482A/B Six/Three 1x4 RF Multiplexer Module User's Manual for
details.
NOTE
The Agilent E8482B Three 1x4 RF Multiplexer module is identical in
operation to the E8482A Six 1x4 RF Multiplexer module with the exception
of fewer switching channels. The E8482B provides a good choice for users
requiring fewer RF switching channels.
SMB connectors. At power-off,
General Information
15
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