Theory of Operation
4. Theory of Operation
4.1 General Information
The AC source consists of two (6460) or three (6463/6490) power stages, and each stage has
13 print circuit boards and other components. Each of the PCBs has its specific function that
will be described in the following subsection.
4.2 Description of Overall System
Figure 4-1 (on page 4-2) shows the overall system of each power stage. Main power flows
through the A/D, D/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 A/D output is
applied to the input of D/D power stage. The G board of D/D stage takes power from the A/D
output. It generates two isolated DC outputs for D/A power stage. The H board of D/A
inverter generates AC output through full bridge controlled by C board to O board. The D/A
power stage is through O board relays in parallel or series control to obtain more current and
higher voltage.
A board is identified as CPU. The CPU of the AC source is used to perform remote control
through GPIB, RS-232C or EXT VREF interface on Optional board, to control output
frequency and voltage through BS and C boards, to measure voltage, current and power
through BM board, to display message, to scan front panel key through LCD module and K
board, and to monitor all interrupts.
BM board is identified as measurement unit. All measurement functions are done here.
BS board is identified as waveform generator. It generates output waveforms which act as
the reference input of C board.
C board is identified as controller of DC to AC (H board). It controls DC to AC power stage in
order to get low distorted waveform output.
K board is identified as keyboard which includes RPG (Rotary Pulse Generator). It is an
interface between the user and the instrument when the latter is used in local operation.
Extended and Optional boards are identified as input/output signals which include GPIB,
RS-232C, EXT VERF, printer and other I/O control signals. Optional board is on Extended
board.
M1 board is identified as mother board which includes system power supply, fan control circuit,
and interconnection of A, BM, BS, C boards.
M2 board is simply an interconnection of M1, Extended, and O boards.
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