Polytec PDV-100 User manual

Titel
User Manual
Portable Digital Vibrometer
PDV-100

41097-Man-Vib-PDV100-1209-04en *41097*
Warranty and Service
The warranty for this equipment complies with the regulations in our general terms and
conditions in their respective valid version.
This is conditional on the equipment being used as it is intended and as described in this
manual.
The warranty does not apply to damage caused by incorrect usage, external mechanical
influences or by not keeping to the operating conditions. The warranty also is invalidated in the
case of the equipment being tampered with or modified without authorization
To return the equipment always use the original packaging. Otherwise we reserve the right to
check the equipment for transport damage. Please mark the package as fragile and sensitive to
frost. Include an explanation of the reason for returning it as well as an exact description of the
fault. You can find advice on fault diagnosis in
CHAPTER 6.
Trademarks
Brand and product names mentioned in this manual could be trademarks or registered
trademarks of their respective companies or organizations.
Identification Labels
PDV-100

i
Contents
Contents
1 Safety Information 1-1
1.1 General Safety Information ................................................................................................. 1-1
1.2 Information on Laser Safety ................................................................................................ 1-2
1.2.1 Safety Information..................................................................................................... 1-2
1.2.2 Safety Precautions .................................................................................................... 1-3
1.2.3 Laser Warning Labels ............................................................................................... 1-4
1.3 Information on Electrical Safety .......................................................................................... 1-5
1.4 Specific Safety Information for Lithium Ion Batteries ........................................................... 1-6
1.4.1 Safety Precautions for Using..................................................................................... 1-6
1.4.2 Safety Precautions for Loading ................................................................................. 1-6
2 Introduction 2-1
2.1 Area of Application.............................................................................................................. 2-1
2.2 Measurement Principle ....................................................................................................... 2-2
3 First Steps 3-1
3.1 Unpacking and Inspection ................................................................................................... 3-1
3.2 Operating and Maintenance Requirements ......................................................................... 3-2
3.3 Control Elements ................................................................................................................ 3-3
3.4 Installation .......................................................................................................................... 3-5
3.4.1 Assembly .................................................................................................................. 3-5
3.4.2 Electrical Connection ................................................................................................ 3-7
3.5 Functional Test ................................................................................................................... 3-7
4 Making Measurements 4-1
4.1 Start-up............................................................................................................................... 4-1
4.2 Selecting Suitable Settings ................................................................................................. 4-2
4.2.1 Setting the Velocity Measurement Range .................................................................. 4-2
4.2.2 Setting the Low Pass Filter........................................................................................ 4-2
4.2.3 Setting the High Pass Filter....................................................................................... 4-3
4.3 Setting the Optimal Stand-off Distance................................................................................ 4-4
4.3.1 Coherency between Stand-off Distance and Visibility Maximum ................................ 4-4
4.3.2 Stand-off Distances ................................................................................................... 4-5
5 Operating the PDV 5-1
5.1 Switching On and Off .......................................................................................................... 5-1
5.2 Blocking the Laser Beam .................................................................................................... 5-1
5.3 Focusing the Laser Beam ................................................................................................... 5-1
5.4 Using the Signal Level Display............................................................................................ 5-2
5.5 Fixing the Focus Position....................................................................................................5-2
5.6 Setting Parameters via the Display ..................................................................................... 5-2
5.6.1 Philosophy ................................................................................................................ 5-2

ii
Contents
5.6.2 Organization of the Menus .........................................................................................5-3
5.6.3 The Individual Menus.................................................................................................5-3
5.7 Overrange Indicator .............................................................................................................5-5
5.8 Battery Level Indicator .........................................................................................................5-6
5.9 Measurement Signal Output ................................................................................................5-6
6 Fault Diagnosis 6-1
6.1 No Laser Beam....................................................................................................................6-1
6.2 No Measurement Signal ......................................................................................................6-2
6.3 Focusing Ring can not be Moved.........................................................................................6-2
7 Technical Specifications 7-1
7.1 Standards Applied ...............................................................................................................7-1
7.2 Laser Vibrometer PDV-100 ..................................................................................................7-1
7.2.1 General Data .............................................................................................................7-1
7.2.2 Metrological Properties ..............................................................................................7-2
7.2.3 Optics ........................................................................................................................7-5
7.2.4 Table of the Visibility Maxima .....................................................................................7-5
7.2.5 Dimensions................................................................................................................7-6
7.3 Power Supply PDV-AC ........................................................................................................7-7
7.4 Optional Accessories ...........................................................................................................7-8
7.4.1 Mounting Plate VIB-A-P07 .........................................................................................7-8
7.4.2 Battery Charger PDV-CH ...........................................................................................7-9
7.4.3 Battery PDV-LI ...........................................................................................................7-9
7.4.4 Carrier Bag PDV-BS ................................................................................................7-10
7.4.5 Motor Vehicle Supply Cable PDV-DC .......................................................................7-10
Appendix A: Optional Accessories
Appendix B: Basics of the Measurement Procedure
Appendix C: Declaration of Conformity
Index

1-1
1 Safety Information
1 Safety Information
1.1 General Safety Information
Notes Please read this manual before using the instrument. It will provide you with
important information on using the instrument and on safety. This will protect
you and prevent damage to the instrument. Pay particular attention to the
basic safety information in
CHAPTER 1 and the information in installation,
operation and maintenance in
CHAPTER 3.
Please keep this manual in a safe place and make it available to people using
the instrument. Never pass the instrument on without the manual.
In this manual the following graded safety and warning labels are used:
NOTE!
Identifies action required to simplify using the instrument !
CAUTION!
Danger from "Reason of Danger" ! Identifies the danger caused by an action which could
result in damage to the instrument, if it is not avoided!
WARNING!
Danger from "Reason of Danger" ! Identifies a possible danger resulting from an action
which could lead to death or (serious) injury, if it is not avoided !
Intended use The instrument is intended for laboratory use and for use in an industrial
environment. It may only be used within the limits given in the technical
specifications (refer to
CHAPTER 7).
Faultless and safe operation of the instrument depends on correct and proper
transport and storage, installation and assembly as well as careful operation
of the instrument.
When assembling, installing and operating the instrument, the safety and
accident-prevention regulations for the respective use must be adhered to.
Qualification This instrument may only be operated by persons who are familiar with
electrical measurement equipment and have been instructed in the use of
lasers. Please pay attention to the information on laser safety in
SECTION 1.2.
Intervention for maintenance and repair work may only be carried out by the
manufacturer himself or by qualified personnel authorized by the
manufacturer.
Disposal An instrument which is no longer required must be disposed of according to
the local regulations unless otherwise provided by the manufacturer.

1-2
1 Safety Information
1.2 Information on Laser Safety
1.2.1 Safety Information
The light source of the instrument is a helium neon laser. It is important to
understand that laser light has properties different from ordinary light sources.
Laser light is generally extremely intense due to the beam's low divergence.
Great care should be taken when handling lasers that the direct or reflected
beam do not enter the eye.
NOTE!
Please see CHAPTER 7 for the detailed technical specifications!
The protective measures are described in the following support compliance
with the safety standards for laser class 2:
• Polytec instruments generally comply with the standards IEC and
EN 60825-1 or US 21 CFR 1040.10 and 1040.11 respectively except for
deviations pursuant to Laser Notice No. 50, dated 24 June 2007.
• The optical output power of the laser beam emitted from the sensor head
is less than 1mW provided the equipment is used in the manner for which
it was intended. This means that the instrument conforms with the
laser
class 2
and is generally very safe. It is thereby usually assumed that the
eyes are protected by prevention mechanisms including the blink reflex.
This reaction offers appropriate protection under reasonable foreseeable
operating conditions. This includes the use of optical instruments for
observing the laser beam. Even when optimally focused, the laser beam
is not intense enough to harm the skin.
• The instrument is equipped with a beam shutter to block the laser beam
during the warm-up phase or when the vibrometer is not in use, although
switched on.
• An emission indicator on the instrument signalize the activity of the
installed laser and thus the potential hazard of laser beam emitted.
• The user should not attempt to open the housing of the instrument which
contains the laser unit as he could be exposed to a higher level of laser
energy that is potentially hazardous.
WARNING!
Danger from uncontrolled light emission ! Use of controls or adjustments or
performance of procedures other than those specified herein may result in hazardous
radiation exposure.

1-3
1 Safety Information
1.2.2 Safety Precautions
Pay attention to the following safety precautions when using the instrument:
• Only qualified and fully trained persons should be entrusted with setting
up the instrument, adjusting and operating it!
• Avoid looking directly into the laser beam with the naked eye or with the
aid of mirrors or optical instruments!
WARNING!
Danger from laser light ! It can be dangerous to look directly into the laser beam for any
length of time.
NOTE!
Wear suitable laser protection glasses when you have to look at the target area of the laser
beam long and hard to set it up!
• Never intentionally direct the laser beam at anyone!
WARNING!
Danger from laser light ! Do not use any reflective tools, watches etc. when you are
working in the beam path of the laser !
• Only open the beam shutter when making measurements !
• To position the instrument, always close the beam shutter. The beam
shutter should not be opened until the sensor head has been roughly
aligned and mounted securely!
• The laser beam should be terminated at the end of its intended path
where this is practically possible.
• Instruments which are not in use should be stored in places which
unauthorized persons do not have access to.

1-4
1 Safety Information
1.2.3 Laser Warning Labels
Laser warning
labels
The laser warning labels for the PDV are shown in FIGURE 1.1. For the
countries in the European Union (EU), label
2 is affixed in the language of the
customers country (see right-hand-side).
Figure 1.1: Laser warning labels for the PDV
Position The position of the laser warning labels on the PDV is shown in FIGURE 1.2.
Figure 1.2: Position of the laser warning labels on the PDV
Laserstrahlung
Nicht in den Strahl blicken
Laser Klasse 2
Nach EN 60825-1 (2008)
P 1 mW/cw; = 633 nm£l
Laser Radiation
Do not stare into beam
Class 2 Laser Product
According to IEC/EN 60825-1 (2008)
Complies with 21 CFR 1040.10 and
1040.11 except for deviations pursuant to
Laser Notice no. 50, dated 24 June 2007
P 1 mW/cw; = 633 nm£l
1
2
2
1

1-5
1 Safety Information
1.3 Information on Electrical Safety
PDV The instrument is designed to be used powered by a low voltage (nominal
12V DC) provided externally, which is accessible for constructional reasons.
The instrument complies with the electrical protection class 1 in accordance
with the EU directive 2006/95/EEC (low voltage directive). With correct mains
connection and intended use, exposure to electric current is prevented by the
closed, grounded metal housing.
The instrument is subjected to the EU directive 2004/108 /EG (EMC directive)
and therefore complies with the limit values for emission and immunity of the
standards they are based on (refer also to
SECTION 7.1and APPENDIX C).
The housing may not be opened when using the instrument as intended.
Opening the housing will invalidate the warranty. None of the equipment may
be operated with opened housing.
WARNING!
Danger from electrical current ! Intervention for maintenance and repair work may only
be carried out by the manufacturer himself or by qualified personnel authorized by the
manufacturer!
Power supply To avoid the danger of an electrical shock or faults, only use the plug-in power
supply PDV-AC provided by the manufacturer. Do not expose the power
supply to rain and moisture.
It is not nesessary to open the housing when using the power supply as
intended. Always use the correct plug adapter.
Battery charger
(optional)
Lithium ion batteries require a very strict compliance with the charging
parameters. Thus only use the battery charger PDV-CH provided by Polytec.
Using any other battery chargers may result in fire or explosion of battery.
CAUTION!
Danger of overheating ! When loading the batteries it is recommended to open the cover
of the carrier bag to ensure unimpeded air circulation.

1-6
1 Safety Information
1.4 Specific Safety Information for Lithium Ion Batteries
1.4.1 Safety Precautions for Using
Pay attention to the following safety precautions when using lithium ion
batteries:
WARNING!
Danger from mishandling! Incorrect use of the battery may result in an excessive rise in
temperature (heat accumulation), fire or explosion leading to serious personal injury!
• Do not throw the battery into fire or expose it to extreme heat!
• Do not leave the battery in the direct sun, near a radiator, or in a closed
car on a warm day!
• Do not reconstruct, disassemble, deform, or short-circuit the battery.
• Do not touch the battery poles with metal objects like necklaces, keys,
coins or hair pins! Replace the protective cap on the battery cable
connector, if the battery is being stored.
• Do not allow the battery to come into contact with sea water or water of
any kind!
• Do not drop the battery or subject it to great shocks!
• Do not use any batteries which are emitting a fluid or which show external
damage.
1.4.2 Safety Precautions for Loading
Pay attention to the following safety precautions when using lithium ion
batteries:
WARNING!
Danger from mishandling! Incorrect behavior when charging the battery may result in an
excessive rise in temperature (heat accumulation), fire or explosion leading to serious
personal injury !
• To charge the battery, only use the battery charger provided by the
manufacturer!
• Never connect the battery directly to a mains supply or an on-board plug
socket!
• While charging, do not place the battery in direct sunlight. If the battery
gets too hot, a built-in safety device is activated, preventing the battery
from charging further. Heating the battery can destroy this safety device
and can cause an explosion or ignition of the battery.
• If the given charge time for the battery is significantly exceeded without
the battery reaching full capacity, please abort the charging process.
Doing so may cause the battery to overheat, explode, or ignite!

2-1
2 Introduction
2 Introduction
2.1 Area of Application
Polytecs Portable Digital Vibrometer PDV-100 is used for non-contact
measurements of surface vibrational velocities. The PDV-100 is a compact,
portable laser vibrometer with state-of-the-art design of optics and signal
processing. The PDV-100 is shown in
FIGURE 2.1.
Figure 2.1: View of the PDV
In the frequency range from 0.05 Hz...to 22 kHz the handy PDV-100 allows
you to realize measurement accuracy which you previously needed a
stationary measurement device in a calibration laboratory to achieve. With the
three measurement ranges, which cover a velocity range from 0.05μm/s to
0.5m /s, and with precise digital filters you can optimally to adjust the PDV
nearly all applications in the acoustic frequency range.

2-2
2 Introduction
2.2 Measurement Principle
The PDV use the principle of the heterodyne interferometer to acquire the
characteristics of mechanical vibrations or transient motion processes (refer
to
APPENDIX B). With this type of interferometer, a high-frequency carrier
signal is generated on the photo detector with the aid of a Bragg cell. To make
the vibration measurement, the beam of a helium neon laser is pointed at the
vibrating object and scattered back from it. The velocity amplitude of a
vibrating object generates a frequency modulation of the laser light due to the
Doppler effect. This modulation is recovered in the signal processing unit with
the aid of suitable demodulations (or decoders). A schematic layout of the
signal path is shown as a diagram in
FIGURE 2.2. The velocity information is
recovered from the frequency modulation of the Doppler signal.
Figure 2.2: Signals in the vibrometer
In the PDV, the optics and the signal processing unit are inside the housing.
The demodulation of the Doppler signal is purely based on a digital process.
In contrast to the conventional vibrometers which use analog, this then means
that the measurement accuracy is virtually independent of aging and
environmental influences. State-of-the-art DSP technology makes it possible
to realize excellent measurement system characteristics, despite the compact
design and minimal energy consumption.
By using a serial interface proven in digital audio technology, the output signal
ca be fed into the digital inputs of modern recording devices or signal
analyzers without any loss of accuracy. For the conventional type of signal
processing, an analog signal output with 24bit amplitude resolution is also
available.
Velocity
decoder
Object
s(t)
v(t) = ds/dt
Doppler signal fD
v(t)
D
f(t)
Filter
DSP
IVS-400
INDUSTRIAL VIBRATION SENSOR
u(t) ~ v(t)
LP
HP
A
D
Audio
transmitter
S/P-DIF

3-1
3 First Steps
3FirstSteps
3.1 Unpacking and Inspection
unpacking The scope of supply consists of the following components:
• Laser vibrometer PDV-100
• Plug-in power supply PDV-AC
• Carrier bag
• Digital audio cable (Triax/RCA)
• 1 Allen key size 1.5mm
• 1 Sheet reflective film 3M Scotchlite Tape® (enclosed in the manual)
optional
• VIB-A-P07 (mounting plate)
• Carrier bag PDV-BS with integrated lithium ion battery PDV-LI
(rechargeable) and battery charger PDV-CH
• Motor vehicle supply cable PDV-DC for the PDV being operated at a 12V
on-board plug socket or a motor vehicle cigarette lighter
• VIB-A-T01 (tripod with 3-axes head)
• VIB-A-T02 (tripod with fluid stage)
CAUTION!
Danger from dirt! Handle the front optics with care! Dirt may only be removed by using a
soft, dry cloth, an optics brush and bellows!
Inspection Please pay attention to the following steps when unpacking:
1. Check the packaging for signs of unsuitable handling during transport.
2. After unpacking, check all components for external damage (scratches,
loose screws, damaged glass platesetc.).
3. In the case of wrong delivery, damage or missing parts, inform your local
Polytec representative immediately and give them the serial number of the
instrument. The identification label can be found on the underside of the
instrument and also on the inside cover of this manual.
4. Carefully retain the original packaging in case you have to return the
instrument.
5. Install the instrument as described in
SECTION 3.4 and execute a first
functional test as described in
SECTION 3.5.

3-2
3 First Steps
3.2 Operating and Maintenance Requirements
Ambient
conditions
The PDV can be used in dry areas under normal climatic conditions (refer to
CHAPTER 3.5). Avoid condensation on the optical components caused by a
rapid change in temperature. Avoid exposure to direct sunlight to prevent the
instrument from overheating.
Mains
connection
To avoid the danger of an electrical shock or faults, only use the plug-in power
supply PDV-AC provided by the manufacturer. Do not expose the plug-in
power supply to rain or moisture.
Assembly The PDV should not be provisional mounted but be mounted with help of
fixing screw threads on the mounting plate (optional) or stable tripod. To
ensure sufficient cooling, if possible mount the PDV on cooling metal
surfaces.
Cooling from
radiant
His essential to ensure unimpeded air circulation around the PDV and protect
it from radiant heat. With high ambient conditions, if possible mount it on
cooling metal surfaces to minimize heat built-up.
Connecting
cable
Make sure that all jacks are connected properly and firmly. Protect the
connecting cables against mechanical damage and high temperature.
Warming-up After switching on, the helium neon laser in the PDV will take a little while to
reach the optimal operating temperature after it has been switched on. The
PDV therefore reaches its optimal properties after a warm-up period of
approx. 20 minutes. After that you can be sure that all components are
working property in accordance with the specifications. Less accurate
measurements, such as to align the PDV for example, can however be carried
out with usefully results before this warm-up period has expired.
Cleaning The housing surfaces of the instrument can be cleaned with mild detergent or
disinfectant solutions. Organic solvents must not be used!
Optical
components
Handle all optical components with great care. Dirt may only be removed very
carefully with a soft, dry cloth, an optics brush and bellows.
Installation
of other
components
Hard or software components which do not belong to the vibrometer system
can damage the system. Using them will invalidate the warranty. If you want
to install such components please contact Polytec.
Opening the
instruments
It is not necessary to open the housings when using the equipment as
intended and will invalidate the warranty. Exchanging or retrospectively
installing modules may only be carried out by authorized service personnel of
Polytec.
Battery and
battery charger
(optional)
The lithium ion battery for the PDV can be used at temperatures of between
0°C to +40°C (+32°F to +104°F). Make sure, that there are temperatures
between +10°C to + 30°C (+50° F to +86° F) when charging the battery.

3-3
3 First Steps
3.3 Control Elements
View from
above
The view from above of the PDV with its control elements is shown in
FIGURE 3.1.
Figure 3.1: View from above of the PDV
1 Beam shutter
Beam shutter to block the laser beam (refer to SECTION 5.2)
WARNING!
Danger from laser light ! Only open the beam shutter when you are making
measurements!
2 Focusing ring
Ring to focus the laser beam (refer to SECTION 5.3)
3 Clamping screw for the focusing ring
Allen screw to fix the focusing ring after focusing the laser beam (refer to
SECTION 5.5)
4 Liquid Crystal Display (LCD) with background lighting
The display shows the settings of the vibrometer. The organization of the display
and how to use it to operate the vibrometer is described in detail in
SECTION 5.6.
5 Selection key
By using this key the cursor is moved in a circle on the display from one
parameter to the next. The cursor is used to select the parameter which should
be changed (refer to
SECTION 5.6).
6SET key
By using this key the setting of the selected parameter is changed (refer to
SECTION 5.6).
1 2 4 5 6
3
L a s e r s t r a h l u n g
N i c h t i n d e n S t r a h l b l i c k e n
L a s e r K l a s s e 2
N a c h E N 6 0 8 2 5 - 1 2 0 0 1 )
P £ 1 m W / c w ; l = 6 2 0 - 7 0 0 n m

3-4
3 First Steps
Rear view The rear view of the PDV with its control elements is shown in FIGURE 3.2.
Figure 3.2: Rear view of the PDV
1 Analog voltage output ANALOG OUT (BNC jack)
The voltage at this output is proportional to the instantaneous vibrational velocity
of the object. The voltage is positive when the object is moving towards the
vibrometer optics.
2 Digital signal output DIGITAL OUT (Triax jack)
At this output the velocity information is available in S/ P-DIF format (Sony/
Philips Digital Audio InterFace), e.g. to display the output signal on a PC monitor
using a sound card.
3 Connector for 12V DC voltage (4-pin circular connector)
Socket for the connecting cable of the power supply or for the battery cable
A N A L O G
O U T
D I G I T A L
O U T
1 2 V
m a x . 1 5 W
1
2
3

3-5
3 First Steps
View from the
bottom
The view from the bottom of the PDV with its control elements is shown in
FIGURE 3.3.
Figure 3.3: View from the bottom of the PDV
1 Mounting holes M6
Using these two mounting holes, the PDV can be mounted on cooling metal
surfaces.
2 Three mounting holes M5 for optional tripod VIB-A-T02
Here the quick release plate of the optional tripod will be fixed (refer to
SECTION 3.4.1).
3 Mounting hole 1/ 4’’-20UNC
By using this mounting hole, the PDV can be mounted on camera tripods with an
inch thread, e.g. the optional tripod with 3-axes head VIB-A-T01.
4 Identification label
On the identification label you will find, among other things, the serial number of
the instrument.
3.4 Installation
3.4.1 Assembly
The PDV has serval threaded holes on the underside to mount the laser
vibrometer:
• Two mounting holes M6 for assembly on cooling surfaces (if necessary)
• One mounting hole 1/4" for assembly on a camera tripod, e.g. the
optional tripod with 3-axes head VIB-A-T01
• Three mounting holes M5 for assembly onto the optional tripod with fluid
stage VIB-A-T02
Before you attempting to mount the PDV, check that all locking mechanisms
of the tripod, particularly the screws are tight. Loose screws may cause the
tripod to be unstable and possibly collapse.
M 6
1 / 4 " - 2 0 U N C
M 6
M a n u f a t u r e d b y : D - 7 6 3 3 7 W a l d b r o n n , G e r m a n y
G m b H
M o d e l N o . : P D V 1 0 0 x x x x
S e r i a l N o . : 5 0 0 x
M f g . - D a t e : 0 3 . 2 0 0 1
1 2 3 1 4

3-6
3 First Steps
Assembly
onto tripod
VIB-A-T01
To mount the PDV on the tripod VIB-A-T01, proceed as follows:
1. Assemble the tripod as described in the assembly instruction provided by
the manufacturer MANFROTTO.
2. Then mount the 3-axes head onto the tripod as described in the assembly
instructions provided by the manufacturer MANFROTTO.
3. Set the PDV onto the 3-axes head and fix it by using the central 1/4"
screw.
4. Whenever you want to remove the PDV from the 3-axes head, you should
hold the instrument while undoing the 1/4" screw.
5. Keep the assembly instructions for the tripod and the 3-axes head in a
safe place.
Assembly
onto tripod
VIB-A-T02
To mount the PDV on the tripod VIB-A-T02, proceed as follows:
1. Assemble the tripod as described in the assembly instruction provided by
the manufacturer MANFROTTO.
2. Then mount the fluid stage onto the tripod as described in the assembly
instructions provided by the manufacturer MANFROTTO.
3. Open the locking mechanism on the fluid stage by simultaneously
pressing the safety latch and opening the safety lever.
4. Mount the hexagonal quick release plate provided on the underside of the
PDV using the 3 screw M5.
5. Use this plate to position the PDV on the fluid stage.
The safety lever clicks automatically into place.
6. Ensure that the quick release plate is attached all the way round. This
needs to be done, before the PDV is ready to use.
7. Whenever you want to remove the PDV from the fluid stage, you should
hold the instrument while opening the safety lever.
8. Keep the assembly instructions for the tripod and the fluid stage in a safe
place.

3-7
3 First Steps
3.4.2 Electrical Connection
Mains operation Only use the power supply PDV-AC provided by Polytec. The power supply
has a wide range input and can be connected to all mains voltages with
nominal values between 100V to 240V.
1. Plug the connecting cable into the socket 12V on the back of the PDV.
The connection must be easy to plug in. If not, check the plug for bent
contact pins to avoid serious damage being incurred.
2. Plug the power supply to an earthed socket.
The display on the PDV lights up and indicates that the PDV is ready to
operate.
Battery
operation
(optional)
As an option you will get the carrier bag PDV-BS with battery and battery
charger. By using the plug-in power supply PDV-AC supplied with the PDV,
the battery charger can be connected up to all mains voltages with a nominal
value between 100V to 240V. For this, connect the cable of the plug-in power
supply with the 12V circular jack on the top of the charger and put the power
supply into an earthed.
Before you use the PDV with a battery, you have to charge the battery plug.
You will find detailed information on this in
SECTION A.1.2. There you will also
find further information on battery operation.
NOTE!
Before you connect up the plug-in power supply to the mains voltage, make sure that the
plug-in power supply is equipped with the right socket inset for your home country. If not,
please contact your local Polytec representative !
3.5 Functional Test
To take the PDV into operation and execute a first functional test, proceed as
follows:
Preparation 1. Make sure, that the beam shutter on the laser vibrometer is closed.
Cabling 2. Plug the connecting cable ot fhe power supplyinto the socket 12V on the
back of the PDV.
The connection must be easy to plug in. If not, check the plug for bent
contact pins to avoid serious damage being incurred.

3-8
3 First Steps
Switching on 3. Connect the power supply to an earthed socket.
On top of the PDV the display lights up. Laser light is not yet emitted as
the beam shutter is still closed.
4. Before you now open the beam shutter, remember the information on
laser safety in
SECTION 1.2!
5. Open the beam shutter. To do so, turn the corrugated ring on the front lens
to the left, when looking in the direction of the emitted laser beam.
The laser beam is now emitted.
Test 6. Point the aperture of the PDV onto a matt white test surface, e.g. a piece
of paper.
7. Position the PDV approximately 23cm away from the test surface
(measured from the retaining ring for the font lens, refer to
SECTION 4.3
and
SECTION 7.2.5). Focus the laser beam on the test surface using the
focusing ring.
If the signal level display on the display lights up, the optics and the
input section of the electronics are working correctly.
8. Set the measurement range (Velo) 20mm/s on the PDV.
9. Connect an oscilloscope to the BNC jack ANALOG OUT on the back of
the PDV.
10. Set the oscilloscope to 1V /DIV and move the test surface.
If the voltage shown on the oscilloscope reacts to the movement of the
test surface, the decoder and output section are working correctly.
NOTE!
Pay attention to the high pass filter being switched off (HP=N). Otherwise you have to move
the test surface rapidly.
If the functional test has been successful, you can install the PDV in the
measurement location as described in
CHAPTER 4 and CHAPTER 5. Pay
attention, that the PDV reaches its optimal properties after a warm-up period
of approx. 20 minutes.
If your PDV does not perform as described above, read through the
information on fault diagnosis in
CHAPTER 6 and if necessary, contact your
local Polytec representative.