(2072 KB) Pobierz
May 2012
Supplement to EPN N°5
EPN Supplement
Test, Measurement
& Sensors
Simplifying waveform
generation and response
page 18
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The new standard is coming.
Be there.
HBM Test and Measurement
D-64293 Darmstadt . Germany
Tel +49 6151 803 0 . Fax +49 6151 803 9100
Email: info@hbm.com
measure and predict with conidence
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The sensor market is enjoying growth as use proliferates in consumer,
automotive and portable markets. The test and measurement market offers
exciting opportunities. Both communities are gathering in Nuremberg for
Sensor and Test 2012, and EPN is pleased to bring you this supplement
covering the latest innovations and products in both sectors.
for additional information on any advertisements or products covered in this
supplement, you may enquire online at www.epn-online.com.
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Test, Measurement & Sensors
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[4] Rotary position sensors meet many
applications, by Chris Gottlieb, Honeywell Sensing
& Control
Page layout & Design
Carolina Ronco
Sales Support Manager
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Martin Savery
[6] fRAM Microcontrollers - benefits in wireless
sensor networks, by Volker Rzehak, Texas
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[10] Electromechanical system testing - cause and
effect, by Kelvin Hagebeuk, Yokogawa Europe
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[14] Accelerometers - fact and fantasy, by Harvey
Weinberg, Analog Devices
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[18] Simplifying waveform generation and
response measurement, by Phil Stearns, Agilent
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American Sensors Technology
…… 21
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Tektronix ………………………… 21
Analog Devices …………………… 14
LeCroy …………………………… 17
Texas Instruments ……………………6
BMC Messsystem ………………… 22
Livingston ………………………… 17
Yokogawa ………………………… 10
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Rotary position sensors meet many applications
By Chris Gottlieb, Honeywell Sensing & Control
Hall-effect rotary position sensors are designed to measure the angle position of a moving element using a magnetic
field instead of mechanical brushes or dials. They use a magnetically biased, Hall-effect integrated circuit (IC) that
senses rotary movement of the actuator shaft over a set operating range.
R otation of the actuator shaft changes
fuel and air to be delivered to the engine
so the vehicle moves faster. When the
operator removes their foot from the
pedal, the Hall-effect rotary position
sensor senses the change in position and
sends a signal to the engine to reduce the
flow of gasoline and air across the throttle
plate; the vehicle responds by slowing
Mechanical cables can stretch and rust,
potentially requiring regular maintenance
and recalibration. Eliminating the
mechanical cable can improve engine
control system response that benefits the
vehicle’s emission, as well as improving
reliability, and reducing excess weight
in the vehicle. This type of drive-by-wire
system can be safer and less expensive
than cable-connected systems. (Fig:1)
a magnet’s position relative to the
IC. The resulting flux density change
is converted to a linear output. Solid-state
Hall-effect technology provides non-contact
operation. The internal section of the sensor
uses a magnetic field, not a physical brush
or wiper that is used in potentiometers.
Wipers used in potentiometers can cause
friction, which can reduce the product’s
life. Using non-contact magnetic Hall-
effect technology in a rotary position
sensor reduces worn-out mechanisms,
lowers actuation torque, and extends the
product’s service life. Hall-effect rotary
position sensors may be used in many harsh
transportation and industrial applications at
a competitive cost.
Figure 1. Foot Pedal Honeywell’s RTY Series
rotary position sensor may be used for foot
pedal position sensing
suspension arm or a linkage to monitor
ride height.
Accurate position sensing validates that
the vehicle is at the correct height for
the application system’s requirement,
improving vehicle ingress/egress. Large
trailer trucks may also use Hall-effect
rotary position sensors to monitor trailer
heights to improve warehouse docking
capabilities. (Fig. 1)
Position Sensor
Transportation applications include heavy
duty equipment and other vehicles, where
the Hall-effect rotary position sensors
may be used to replace the mechanical
cable connection between the foot pedal
and the engine. For example, Honeywell’s
RTY Series rotary position sensor may be
mounted adjacent to the pedal to measure
how far down the pedal is pressed. The
harder the operator presses, the deeper
the pedal is depressed, allowing more
Suspension System
Hall-effect rotary position sensors may
be also be used in buses and heavy duty
ride height systems to sense travel of the
suspension system. Buses use kneeling to
lower their height so that passengers can
board easily. The Hall-effect rotary position
sensor may be used on both ends of the
application: one position sensor monitors
the position of the control lever, and a
second position sensor is deployed on a
Irrigation Sprinklers
Another interesting application for Hall-
effect rotary position sensors is irrigation
sprinkler systems used by large farms.
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Rotary position sensors meet many applications
The sensor can monitor the angle range
at which the sprinklers are irrigating. Is
the irrigation system watering the section
of the field intended, or is the system
watering 360 degrees? This knowledge
can help the farmer reduce water
consumption and increase crop yield.
(Fig. 2)
Valve Control
A common industrial application is the
control of process valves. Oil fields, nuclear
power plants, food processing plants,
and beverage manufacturers require
valves monitor position. Hall-effect rotary
position sensors are used to monitor
position in large and small valves to help
ensure that the valve is closed, or if it’s
open, how open.
Figure 2. Irrigation Pivot ControlHall-effect rotary position sensors may be used to
monitor irrigation equipment steering angles
doesn’t have to. Integral connector: The
integral connector is important for two
reasons: 1) Smaller size: An integral
connected sensor can be smaller than
the overall package size of a sensor
that relies upon a pigtail connection.
This enables developers to design and
build smaller overall system packages;
2) Extended life: Wires in a pigtail can
become strained, frayed, eaten by rodents,
or crimped. Use of an integral connector
increases durability because pigtails are
notoriously fragile. EMI/EMC resistance:
Radio waves of different frequencies can
interrupt electronics. Honeywell’s use of
automotive-grade EMI/EMC protection
provides reliability in sensor performance
against radio frequencies in the
environment. Standardised IO: Industry-
standard AMP termination, 32 mm
mounting pitch, universal pin-out styles,
and a compact package simplify drop-in
replacement because the mounting points,
profile, and pinouts are similar to those of
the incumbent device. Multiple operating
ranges: A variety of operating ranges for
measurement that are tolerant to over-
travel give design engineers the resolution
needed in the span of travel in many
common applications. Flexibility: Low
voltage and high voltage versions that
cover an input voltage range of 4.5Vdc
to 30Vdc provide flexibility of use in the
HoneYWeLL SenSInG & ConTRoL
What to Look For
Considerations when specifying Hall-
effect Rotary Position Sensors include:
Reliability and long life: The IC, which
contains the conditioning, protection
circuitry, and the permanent magnet
should be sealed in an IP67-qualified
rugged package for durability in harsh
environments. This is important because
climate and environment can take a
toll on components. Certified long life:
Honeywell’s RTY Series Hall-effect rotary
position sensors are designed to provide
a 15 million cycle product life due to
its well-engineered bearing design and
the related ICs. Honeywell tests its RTY
Series to 15 million cycles so the customer
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