PCB Piezotronics Larson Davis HVM200 Manuel utilisateur
IHVM200.01 Manual
DRAFT
Larson Davis
HVM200 Manual
DRAFT
Copyright
Copyright 2015 PCB Piezotronics, Inc. This manual is copyrighted, with all rights reserved. The
manual may not be copied in whole or in part for any use without prior written consent of PCB
Piezotronics, Inc.
Trademarks
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Disclaimer
The following paragraph does not apply in any state or country where such statements are not
agreeable with local law:
Even though PCB Piezotronics, Inc. has reviewed its documentation, PCB Piezotronics, Inc. makes no
warranty or representation, either expressed or implied, with respect to this instrument and
documentation, its quality, performance, merchantability, or fitness for a particular purpose. This
documentation is subject to change without notice, and should not be construed as a commitment or
representation by PCB Piezotronics, Inc.
This publication may contain inaccuracies or typographical errors. PCB Piezotronics, Inc. will
periodically update the material for inclusion in new editions. Changes and improvements to the
information described in this manual may be made at any time.
Recycling
PCB Piezotronics, Inc. is an environmentally friendly organization and encourages our customers to
be environmentally conscious. When this product reaches its end of life, please recycle the product
through a local recycling center or return the product to:
PCB Piezotronics, Inc.
Attn: Recycling Coordinator
1681 West 820 North
Provo, Utah, USA 84601-1341
where it will be accepted for disposal.
Warranty
For warranty information, refer to our Terms and Conditions of Sale on our website at
www.larsondavis.com/TermsConditions.aspx.
HVM200 Purchase Information
Record the serial number and date of purchase below.
Serial Number:_______________________ Date of Purchase:____________________
HVM200 Manual Introduction 1-1
CHAPTER
1Introduction
This chapter presents an overview of the HVM200
Human Vibration Meter.
Features
The Larson Davis HVM200 Human Vibration Meter is a
Type 1 instrument designed for use in assessing vibration as
perceived by human beings.
The HVM200 provides the following features for vibration
measurement:
• Whole body, hand-arm, and general vibration
applications
• Wireless mobile interface
• Compact design for easy wear and convenient placement
• Mobile G4 measurement application for configuring,
measuring, and viewing vibration data on multiple
meters
• Connection and control of multiple meters through Wi-Fi
access (
• Support for optional 1/1 and 1/3 Octave Band Analysis
• Support for full SLM Utility G4 Software analysis
Standard Accessories
• USB 2.0 to Micro-USB power and communications
cable
• Removable 64 GB SD memory
Optional Accessories
• 1/1 and 1/3 Octave Band Analysis firmware
• SLM Utility G4 for HVM Software
• Larson Davis PSA035 Power Supply
1-2 Transducer Selection HVM200 Manual
• Larson Davis CCS048 Arm Band for wearing the
HVM200
• Larson Davis SEN041F accelerometer for Hand-Arm
vibration measurements
• Larson Davis SEN020 accelerometer for Hand-Arm and
general vibration measurements
• Larson Davis SEN027 Seat Adapter, accelerometer, and
adapter for whole-body vibration measurements
• Larson Davis ADP063, ADP080A, ADP081A, and
ADP082A adapters for accelerometer placement
Optional Larson Davis CCS047
Hard Shell Case
• Larson Davis CBL210-05, CBL216, and CBL217-01
cables for connection between accelerometers and
HVM200 meter.
• Larson Davis 394C06 Hand-held Shaker for vibrational
measurement verification
• Larson Davis CCS047 Hard Shell Case for transport and
protection of HVM200 and accessories
Transducer Selection
The HVM200 requires a transducer to convert physical
vibration quantities into measurable, electrical signals. In
selecting a transducer for the HVM200, consider the
following
ICP®or Charge Accelerometers
The HVM200 has built-in ICP®
power supplies and charge
amplifiers. This allows the HVM200
to interface directly with ICP or
charge transducers, and eliminates
the need for external signal
conditioning.
•ICP
accelerometers are also called “Voltage Mode” or
“Low impedance” and may be known by various other
vendor trade names. ICP is PCB’s registered trademark
which stands for “Integrated Circuit Piezoelectric” and
identifies PCB sensors which incorporate built-in, signal
conditioning electronics. The built-in electronics serve to
convert the high impedance charge signal that is
generated by the piezoelectric sensing element to a
usable low impedance voltage signal which can be
readily transmitted over ordinary 2 wire or coaxial cables
to any voltage readout or recording device. The low
impedance signal can be transmitted over long cable
distances and used in dirty field or factory environments
with little signal degradation
HVM200 Manual Transducer Selection 1-3
The HVM200 could also be utilized
through an alternative direct input.
This would require, however, the use
of some kind of external signal
conditioning unit such as an external
source of ICP power, or an external
charge amplifier.
• Charge mode sensors output a high impedance, electrical
charge signal that is generated by the piezoelectric
sensing element. This signal is extremely sensitive to
corruption from environmental influences. To conduct
accurate measurements, it is necessary to condition this
signal to a low impedance voltage before it can be input
to a readout or recording device. A charge amplifier or
in-line charge converter is generally used for this
purpose.
Transducer Sensitivity
With accelerometers, the proper sensitivity depends on the
application being performed. If the application is a high
vibration level application, a low sensitivity should be
selected. For low vibration level applications, a high
sensitivity accelerometer should be used.
Transverse sensitivity may also affect measurements. It is
defined as the unwanted output signal of a motion sensor
when subjected to motion perpendicular to the sensitive
axis. This is usually expressed as a percent of the normal
axis sensitivity. For example if you are using a tri-axial
accelerometer and place an input signal on the Z axis, your
X axis could also be reading a level even though there is
really no x-axis signal present.
Resonant Frequency
The resonant frequency is defined as the frequency at which
the structure will readily vibrate. For accelerometers, there is
one frequency at which the accelerometer vibrates much
easier than at other frequencies. At this point, the reading
will be very high, and could overload the input of the
HVM200. However, for most of the recommended
accelerometers, the resonant frequency is well above the
upper limit of the HVM200, and will subsequently be
masked out by the low pass filter on the HVM200. If the
resonant frequency becomes an issue, it is recommended
that an external mechanical filter be used.
Frequency Range
Most recommended accelerometers will have a frequency
range sufficient for use with the HVM200. Refer to the
1-4 Transducer Selection HVM200 Manual
frequency response tables and graphs in this manual for
more information on the HVM200 frequency response.
Environmental Effects
Consider temperature, humidity, and other physical agents,
such as mounting surface, mounting method, mass, and
environment. The mass of the accelerometer should ideally
be no more that 1/50 of the mass of the object being
measured. A ratio of as little as 1/10 is acceptable in extreme
circumstance
HVM200 Manual Getting Started 2-1
CHAPTER
2Getting Started
This chapter provides instructions for setting up and
configuring HVM200 meters for use with the G4App.
Unpacking the HVM200
The HVM200 package includes a USB to mirco-USB cable
with the meter. After removing the HVM200 and cable from
the packaging, record the serial number and date of purchase
in a safe place where it can be retrieved, in case you require
customer support.
Powering the HVM200
Before using your HVM200, you should charge the battery
completely by following these steps:
Step 1 Slide and remove the back battery cover from the
HVM200 meter.
FIGURE 2-1 Remove Battery Cover
Step 2 Insert the supplied battery into the HVM200 so that
the battery contacts align with the power contacts
in the device.
Step 3 Slide the back battery cover onto the HVM200.
2-2 Downloading the HVM200 App HVM200 Manual
Step 4 Connect one end of the supplied cable to the
HVM200 micro-USB port and the other end to a
powered USB port.
The Power LED displays a yellow
color while charging. If the LED
does not show any color, push the
power button in for a few seconds.
FIGURE 2-2 HVM200 Micro-USB Port
Refer to the back label of your
HVM200 for a description of each
LED indication.
Step 5 Make sure the HVM200 is fully charged before
performing any operations. When fully charged,
the Power LED displays a solid green (not
blinking) color. This may take up to 6 hours,
depending on the type of USB port used to charge
the device.
Step 6 Once fully charged, allow the battery to
completely drain with HVM200 usage in the first
cycle before recharging. This allows the battery
power display in the software to more accurately
reflect battery life. After completing the first
cycle, avoid leaving the battery drained for
extended periods of time. This will maximize
overall battery life.
Downloading the HVM200 App
Once your HVM200 is fully charged, use your mobile
device to find and download the HVM200 app from Google
Play or the Apple Store®.
Power LED
Status LED Power Button
Micro-USB
port
HVM200 Manual Connecting to a Wi-Fi Network 2-3
Connecting to a Wi-Fi Network
To establish a Wi-Fi connection with the HVM200 meter,
follow these steps:
Step 1 Launch the HVM App.
Step 2 Click the menu icon, as shown in Figure 2-3.
FIGURE 2-3 HVM200 App
Step 3 On the HVM200 Menu, select Setup Wi-Fi.
FIGURE 2-4 Wi-Fi Setup
Menu
Icon
2-4 Connecting to a Wi-Fi Network HVM200 Manual
Step 4 If no stored networks appear in the Networks
dialog box, select an available network and click
Add Network.
If you have already entered a
password and a stored network
appears, select it and click Connect
Network.
FIGURE 2-5 Networks Settings
Larson Davis recommends using
secure Wi-Fi networks with your
HVM200 meter.
Step 5 Enter the network password, if required, and click
Add.
With multiple stored networks, you
can establish a connection order by
assigning a priority number to the
network. An automatic connection is
first made to the network with the
highest priority. If multiple stored
networks have the same priority
number, an automatic connection is
made with the network displayed
higher on the list.
FIGURE 2-6 Enter Network Password
Step 6 Select the stored network and click Connect.
Step 7 Assign a connection priority value for the
network, if needed.
Step 8 If no network is available, click Set Access Point.
This enables the HVM200 to transmit and receive
data through Wi-Fi to your mobile device.
Click the up or down
arrow to raise or lower
the priority of the
network connection.
Secure network requires
password.
Higher numerical values
establish higher priority
in connection sequence.
If no network is
available, click to
transmit and receive data
through Wi-Fi from the
HVM200 to a mobile
device.
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