Agilent Technologies Weather Radio 1680 Manuel d'utilisateur Page 166

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166
Chapter 8: Theory of Operation
Agilent 1690A,AD-series Logic Analyzer Theory
Agilent 1690A,AD-series Logic Analyzer Theory
Acquisition Board
The Agilent 1690A,AD-series logic analyzers utilize the same acquisition board as
the 1680A,AD-series benchtop logic analyzers. The motherboard interface
connects directly to the IEEE 1394 port on the host PC.
Power Supply
A low voltage power supply provides all the DC voltages needed to operate the
logic analyzer acquisition board. The power supply also provides the +5V VDC
voltage to the probe cables to power the logic analyzer accessories and analysis
probes.
Unfiltered voltages of +12V, +5V, -5.2V, and +3.4 are supplied to the power
distribution board where they are filtered and distributed to other boards and
components in the system.
Power Distribution Board
The power distribution board connects directly to the power supply and
distributes power to the rest of the system. The power distribution board has
circuitry for regulating fan voltage that is temperature dependent as well as
detecting when a fan ceases to spin.
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