4
Theory of Operation
This chapter provides a brief theory of operation for the Agilent 6610xA Power Modules. Figure
AC Input and Bias Supplies
AC input power is distributed to each module through the backplane connector board on the mainframe. A
The ac input is rectified and filtered in the power module, producing the + and - dc rail. In addition to the dc rail, the ac input is also applied to a bias transformer, which provides the following bias voltages:
+15V (primary)
+5V (secondary)
± 12V (secondary)
Microprocessor Circuits
All communication between the modules and the controller or keyboard except for the trigger signals is processed by U44 on the mainframe. The primary function of this microprocessor is to distribute the digital signals from controller or keyboard to the correct module slot in the mainframe.
Microprocessor Ul on the modules communicates with U44 through two data lines
At
CV/CC DACs
Upon receiving data from the microprocessor, the CC and CV DACS output the correct analog output voltage. Both the CC and the CV DACs output an analog signal in the range of 0 to minus 6 volts (calibrated), which corresponds to the zero to