Vansco VMM3120, Руководство пользователя

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User Guide 75
Glossary
current sensor
A device that detects electrical current in a wire and generates a signal
proportional to it.
data link adaptor (DLA)
A development tool that connects the CAN bus to a personal computer (through a
USB or RS232 port), so that programming and diagnostics can be performed on
the product before installing it in a vehicle.
DC-coupled
DC coupling passes the full spectrum of frequencies including direct current. The
signal being read by this circuit must fall within the detection threshold range
specified for the input.
de-rating
The reduction of the rated output current level to a value less than the specified
rating. De-rating is typically done so that a product does not overheat.
digital input
An input that is typically controlled by an external switch that makes the input
either active (on), or inactive (off).
driver (hardware)
An electronic device that switches power or ground to an external load. The driver
is a key component used in all output circuits.
driver (software)
A block of software that provides access to different hardware components.
duty cycle
The time that a device spends in an active or operative state, expressed as a
fraction or percentage of the total cycle time (start, operate, stop).
FET
See field effect transistor .
field-effect transistor (FET)
A transistor whose flow of charge carriers is controlled by an external electric
field.
flyback
A voltage spike seen across an inductive load when its supply voltage is suddenly
reduced or removed.