Agilent Technologies service manual Preparing the 85330A to Control the System, Special Systems

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.

4-4 85330A Multiple Channel Controller