Hioki 8804, Instruction Manual

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1.2 System Operation
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1.2 System Operation
The following page shows a block diagram of the system.
(1) The 8804 incorporates a 8-bit microcomputer (CPU),
which controls the entire system.
(2) The analog input units incorporate 9-bit A/D converters,
and are connected to the 8804 main unit via
photocouplers. (The photocouplers are in the analog input
units.) Each channel uses a separate power source, which
is completely electrically insulated from the main 8804
unit.
(3) The A/D converted data is recorded in memory under
control of the memory controller circuit.
(4) The 8804 main unit employs a digital trigger circuit, and
in the case of an internal trigger, generates a trigger
signal by comparing the digital value after A/D conversion
with a set value.
(5) Measurement data stored in the memory, after being
handled by the CPU, is displayed on the LCD, and is
output on the graphic printer.