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Define
What Is
Glossary
Technical Terms
Word List
Engineering Mechanics
Terminology
Electronics
Describe
Explanations
Meaning
Definition
Electrical
Mechanical
Expressions
Science |
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R-2R:
Short for R-2R ladder. A method for
DAC which employs a ladder-shaped resistor array
composed of two resistor values: R and 2R. Each bit in the
digital input switches a ladder's rungs in and out of the
network to change the output voltage by an amount
proportional to the significance of the bit.
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RAM:
("Random Access Memory"). Also called volatile memory and
sometimes RAWM ("Read And write Memory"), its loss the
entire data when power turned off.
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Recovery Time:
The time for a sensor to return to baseline value after
the step removal of the measured variable. Usually
specified as time to fall to 10% of final value after step
removal of measured variable.
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Remote Diode:
A diode or diode-connected
bipolar transistor used as a temperature-sensing
element, often integrated onto an integrated circuit whose
temperature is to be measured.
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Remote Temperature Sensor:
A remotely located PN junction used as a temperature
sensing device, usually located on an integrated circuit
other than the one doing the measurement.
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Remote Temperature:
Temperature at a location other than at the die of the
temperature-measuring integrated circuit.
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Response Time:
The time for a sensor to respond from no load to a step
change in load. Usually specified as time to rise to 90%
of final value, measured from onset of step input change
in measured variable.
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Reverse Recovery Time:
When switching from the conducting to the blocking state,
a diode or rectifier has stored charge that must first be
discharged before the diode blocks reverse current. This
discharge takes a finite amount of time known as the
Reverse Recovery Time, or trr. During this time,
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Ripple Voltage:
The time-varying part of a voltage that is ideally
time-invariant.
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Rising Edge:
Or a Clock Edge. Is a
transition in a clock signal from either low to high (0 to
1) or high to low (1 to 0). It is called an "edge" because
the square wave which represents a clock has edges at
those points.
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Robot:
A robot is a mechanical
or virtual, artificial agent. It is usually an
electromechanical system, which, by its appearance or
movements. |
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ROM:
("Read Only Memory") Its a memory that does not lose its
contents when the power is turned off, its also called
nonvolatile memory.
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RPM:
Revolutions Per Minute (RPM) is a measure of speed for any
rotating device. Typically found in specifications for
motors. |
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RS-232:
A serial interface published by the
EIA for asynchronous data communication over distances
up to a few hundred feet.
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RTCs:
Real-time clock: Integrated circuit that contains a timer
that supplies the time of day (and often, the date). An
RTC generally contains a long-life battery to allow it to
keep track of the time even when there is no power
applied.
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RTD:
A Resistance Temperature Detector (RTD) is a device with a
significant temperature coefficient (that is, its
resistance varies with temperature). It is used as a
temperature measurement device, usually by passing a
low-level current through it and measuring the voltage
drop. A thermistor is a common type of RTD.
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RTS:
Request to send: A data communications signal ( RS-232)
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Rx:
Receive RS232
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