Theories of Operation
4. Theories of Operation
4.1 General Information
The 6430, 6420 or 6415 AC power source consists of 14 main boards and other discrete
components. Each of them has its own specific function that will be described in the
subsections below.
4.2 Description of Overall System
Figure 4-1 (on the next page) shows the block diagram of overall system. Main power flows
through the A/D, D/D, and D/A power stage through the converter. The A/D power stage is
designated as I board, and generates DC from the line input. The DC voltage of the A/D output
is applied to the input of the next power stage.
With an isolation transformer, G board converts the DC voltage to unregulated DC voltage which
is accepted by a switch-mode inverter. Then, the inverter produces desired AC voltage output
on H board which consists of the full bridge.
A board is identified as CPU. The 80C188 CPU is used to communicate with BM and BS
boards for programming variable output voltage and frequency, to monitor or control the signals
and interrupts, and to perform remote control through the GPIB or RS-232C interface on the
optional board.
The seven-segment LEDs and keyboard are identified as D board and K board respectively.
They become the interfaces between the user and the instrument. The fan is used to remove
extra heat from the interior of the 6430, 6420 or 6415 AC source.
4-1
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