Agilent Technologies Multiple Channel Controller 85330A - Manual (Page 132)

9-2 85330A Multiple Channel Controller
Service
Theory of Operation
Theory of Operation
The 85330A multiple channel controller was designed as a high-speed,
real-time controller for the 8530A microwave receiver. The 85330A controls
external solid-state transmit and receive switches and allows for
asynchronous TTL communications to the receiver, the RF and LO sources,
and other remote 85330As. It is implemented using a standard VXI
mainframe and has a downloadable software driver that provides the
controllers with their own GPIB command set for control, setup, and
initiating runtime sequences.
A diagram of the entire system is shown in the Figure 9-1, “85330A System
Block Diagram,” next. All of the connections from the 85330-60002 card’s
rear panel to other instruments are optional and may be different for each
system, depending on the system’s requirements from the 85330A.
NOTE A receiver may use the STOP SWEEP line, if the RCVR READY line is not
available.
The 85330A was implemented using an Agilent 75000 Series B VXI
mainframe. A special VXI card was developed to handle the necessary
control and timing requirements. This card is driven by a standard VXI
parallel interface card (Digital I/O card.) A downloadable software driver
was developed to provide fast runtime control of the measurement system.