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4-4 85330A Multiple Channel Controller
General Information
Preparing the 85330A to Control the System
Preparing the 85330A to Control the System
Configuring the 85330A is composed of the following steps:
1. Send the 85330A a series of GPIB setup commands prior to starting the
run-time sequence.
2. Start the run-time sequence by sending a specific GPIB command.
3. The 85330A then waits for a positioner trigger signal to begin the
sequence.
4. The 85330A repeats the sequence for the specified number of frequency
points to be measured.
More detailed information on this subject is explained in Chapter 6,
“Programming.”
Special Systems Special system configurations allow you to:
• Daisy-chain SCUs to provide many channels with a single multiple
channel controller.
• Add remote multiple channel controllers to expand the switch tree or
extend the physical distance that switches can be placed from the control
room. Additional remote multiple channel controllers can be up to
2 Kilometers away from the master.
Switch Components The 85330A controls the following items:
Switch control units
In standard systems, the system interface board communicates with one or
two SCUs. SCUs perform the following tasks:
• They decode binary information from the multiple channel controller to
determine which switch should be closed.
• They provide the necessary bias voltages to the switches, which causes
them to switch states.
In a standard system, one SCU is connected to the multiple channel
controller’s PORT 1 connector, and the other SCU is connected to PORT 2.
The separate ports provide the ability to put switches at the transmit and
receive site.