PRODUCTS & SERVICES
low frequency vibration
measurement
A new family of DC MEMS accelerometers offers
low frequency measurements down to 0Hz
alongside reliable performance
AEROSPACETESTINGINTERNATIONAL.COM // SEPTEMBER 2019 99
PCB Piezotronics has launched a new
family of DC MEMS F series
accelerometers for low frequency
measurements down to 0Hz (static or DC
acceleration). These new variable capacitive
sensors are designed for uniform, repeatable
performance. They offer high overload
protection, use the latest capacitive sensing
technology and come in six measurement
ranges of ± 2, 10, 30, 50, 100 and 200 g. The
entire family exhibits a high overload shock
capability (±3,000 or 5,000 g) along with a
wide operating temperature range of up to
-65 to 250°F (-54.0 to 121°C). Electrically,
these new units offer a single-ended or
differential output signal with power, signal,
and ground leads for each channel. Supply
voltage regulation permits operation from +5
to +32 VDC, enabling its use with many data
acquisition systems.
The 3711F single axis and 3713F triaxial DC
MEMS series accelerometers are electrically
case-isolated with a hermetically sealed
robust titanium outer housing allowing for
very stable and accurate measurements in
the most severe operating environments and
applications. In addition, these series are
inherently insensitive to base strain and
transverse acceleration effects.
The single axis 3711F models incorporate a
welded, ¼-28 4-pin socket connector that
mates with standard ¼-28 plugs, allowing for
various cable lengths or replacement of worn
cables. In addition to the standard models, the
option of a 10ft (3m) shielded integral cable
with pigtails ends and a FEP jacket are
available. The 0.45 x 0.85 x 0.85in (11.4 x 21.6 x
21.6mm) units weigh only 16.3g enabling use
where space is a premium. Through-hole
mounting allows for ease of installation into
complex structures. The 3711F series is
supplied with an easy mount clip, in addition
to mounting studs (SAE and Metric). A triaxial
mounting block is available as an option to
incorporate three 3711F on one cube.
The triaxial 3713F models incorporate a
welded, 9-pin socket connector that mates
with 9-socket connector, allowing for various
cable lengths or replacement of worn cables.
In addition to the standard models, the option
of a 10ft (3m) shielded integral cable with
pigtails ends and a polyurethane jacket is
available. The small 0.8in cube (20.3mm) units
weigh only 17.3g which warrants its use when
a triaxial accelerometer and minimal weight
is required. An internal 10-32 thread supports
stud mounting for easy installation into
complex structures.
The 3713F series sensors are also supplied
with an adhesive base. Select 3713F models
are part of the PCB Platinum Program,
meaning they are in stock and ready to ship
and come with lifetime warranties.
The true differential single axis 3741F DC
MEMS series accelerometers are low profile
and low mass with an electrically
case-isolated package featuring an anodized
aluminum outer housing for added durability.
Standard models incorporate a 10ft (3m)
integral 4-conductor, shielded FEP cable with
pigtails and through-hole mounting for ease
of installation into complex applications. The
0.30 x 1.00 x 0.85in (7.62 x 25.4 x 21.6mm) units
weigh only 9.92g, which is fitting for where
weight is at a premium.
Supplied with both SAE and metric
mounting screws, the 3741F accelerometers
offer a true differential output signal for
common-mode noise rejection. An optional
triaxial mounting block is available as an
accessory to facilitate triaxial measurement
configurations. Low current consumption
(≤5 mA), low offset voltage (±20 mV DC) and
wide excitation voltage (5 to 32 VDC) make
them easy to use.
The DC MEMS F series accelerometers are
specifically designed to help aerospace test
engineers to measure low frequency
vibration. They are well suited for applications
such as modal analysis, flight testing,
helicopter vibration monitoring, and flutter
testing. Any vibration sensing application
requiring DC acceleration with high resolution
and high g load survivability will benefit from
these new accelerometers. \\
// The new F Series of DC
MEMS accelerometers
uses the latest capacitive
sensing technology
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PCB Piezotronics
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