Theory of Operation
4. Theory of Operation
4.1 General
The 6404/6408 AC power source consists of 8 main boards and other discrete components.
Each has its specific function that will be described in the sections followed.
4.2 Overall System Description
Figure 4-1 shows the overall system blocks. Main power flows through the A/D, D/A power
stage converter. The A/D power stage is designated as I board and generates DC voltage
from the line input. The DC voltage of the A/D output is applied to the input of the next
power stage.
The P board of D/A stage takes power from the A/D output; the fan speed control circuit is
also on P board.
The isolated output transformer takes power from D/A output and transfer it to two sets at
secondary, connected in parallel or serial at O board to obtain more current or higher
voltage.
A board is identified as CPU. The 64180 CPU is used here to communicate with DSP at B
board for programming variable output voltages and frequencies, to monitor or control the
signal and interrupts, and to perform remote control through the GPIB or RS-232C interface
on the optional board.
B board is identified as the sine wave generator, measurement unit, and D/A power stage
controllers. It generates sine waves acting as the reference input of the D/A stage. All
measurement functions are done here.
The seven-segment LEDs and keyboard are identified as D board and K board
respectively, which makes the interfaces between the user and the instrument. Fan is used
to remove extra heat from interior of the 6404/6408 AC Source.
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