Delta OHM HD2070 User manual

The quality level of our instruments is the result of a continuous product development. This can lead to
differences between what is written in this manual and the tool that you purchased. We cannot completely
rule out errors in the manual, we apologize for this inconvenient.
The data, pictures and descriptions, contained in this document, cannot be legally enforced. We reserve the
right to make changes and corrections without notice.
HD2070
ENGLISH
REV. 1.1
2014, 11th June

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Vibration Analyzer
HD2070

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CONNECTORS AND KEYBOARD
The tool is endowed with keyboard with 13 keys, six connectors on the top and three connec-
tors on the bottom. On the top there is also the memory card slot.
With reference to the figure at page 2 there are:
1Slot for SD memory card with a maximum size of 2GB.
24 poles LEMO-B type connector for the connection of a triaxial or monoaxial accelerometer with
integrated electronics (type IEPE or compatible).
36 poles LEMO-B type connector for the analog outputs (LINE) of the 3 accelerometric channels.
4LEFT arrow key on the keypad: in the graphic mode it moves left the cursor or the two active cur-
sors (blinking). In VLM mode it allows to scroll the VLM_1, …, VLM_4 screens. In the spectrum mode,
it allows to switch from acceleration viewing to speed and displacement viewings.
5CURSOR key on the keypad: in graphic mode it allows to select one of the two cursors or both of
them. Holding pressed the CURSOR key for at least 2 seconds when the third-octave spectrum (op-
tion HD2070.O1 “Spectral Analysis”) is displayed, the limit acceleration curve tracking is activated.
6HOLD key: it temporarily stops the display update.
7MENU key: it allows to access the configuration menu and the programs list. With the same key, the
menu is exited to go back to the measure mode.
8REC (recording) key: in combination with START / STOP / RESET, it activates the continuous data
recording in the memory. If it is hold pressed for at least 2 seconds, it is possible to memorize what
it is displayed as single record or to start the vocal recording.
9PAUSE/CONTINUE key: to put in pause mode the integrated measures. From PAUSE mode, press
the same key to start again the integrated measures. In PAUSE mode, the measures are reset if the
START / STOP / RESET key is pressed.
10 UP arrow key: in menu mode, it selects the previous row or increases the selected parameter. In
VLM screen, it adjusts the boundaries of the horizontal bar. In graphical mode it decreases the initial
and final levels of the vertical scale; in this way, the graph is moved upward.
11 LEFT arrow key: in menu mode, it is used to edit the parameters with attribute. In VLM screen, it
changes the measure unit. In graphic mode, it compresses the vertical scale.
12 MiniDin type connector for RS232C serial port. For the connection to a PC RS232 port or to the
HD40.1 printer, it is necessary to use the adequate null-modem serial cable (HD2110CSNM code),
provided with a D-sub 9 poles connector.
13 Male connector for external power supply (∅5.5mm-2.1mm socket). It requires a
9…12Vdc/300mA power supply. The power supply positive pole must be connected to the central pin.
14 USB connector type B to connect the vibration analyzer to the USB port of a PC using a standard
USB cable with type A and B connectors (CP22 code).
15 DOWN arrow key: in menu mode, it selects the subsequent row or decreases the selected parame-
ter. In VLM screen, it changes the limits of the horizontal bar. In graphic mode, it increases the initial
and final levels of the vertical scale; in this way, the graph is moved downward.
16 RIGHT arrow key: in menu mode, it is used to edit the parameters with attribute. In graphic mode,
it expands the vertical scale. In the VLM screen, it changes the measure unit.
17 ENTER key: it confirms the input of the data or the modification of a parameter.
18 START/STOP/RESET key: if pressed in STOP mode, it starts the measurements (RUN mode). In
RUN mode, it stops the measurements. If pressed in PAUSE mode, it resets the values of the inte-
grated measures like Aeq, MAX/MIN levels, etc ...
19 CHN key: it selects the three measuring channels CH1, ..., CH3 (circular scrolling).
20 MODE key: it selects in a circular sequence the different instrument visualizing modes: VLM, timing
profile, octave or third-octave spectra (option) , distribution of probability and percentile levels (op-
tion HD2070.O2).
21 ON/OFF key: to turn on and shutdown the instrument.
22 RIGHT arrow key on keypad: it moves right the cursor or the two active cursors (blinking). In VLM
mode, it allows to scroll the VLM_1, …, VLM_4 screens. In the spectrum mode (option), it allows to
switch from acceleration viewing to speed and displacement viewings.
23 3.5 mm jack connector for the connection of a microphone for vocal recordings.
24 4 poles LEMO-00 type connector for the trigger output.
25 3.5 mm jack for the connection of headphones.

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CERTIFICATO DI CONFORMITÀ DEL COSTRUTTORE
MANUFACTURER’S CERTIFICATE OF CONFORMITY
rilasciato da
issued by
DELTA OHM SRL STRUMENTI DI MISURA
DATA
2014/06/11
DATE
Si certifica che gli strumenti sotto riportati hanno superato positivamente tutti i test di
produzione e sono conformi alle specifiche, valide alla data del test, riportate nella
documentazione tecnica.
We certify that below mentioned instruments have been tested and passed all production tests,
confirming compliance with the manufacturer's published specification at the date of the test.
Le misure effettuate presso un Laboratorio di Taratura Accredia sono garantite da una
catena di riferibilità ininterrotta, che ha origine dalla taratura dei campioni di prima linea
del Laboratorio presso l’istituto metrologico nazionale.
Measurements performed in an Accredia Calibration Laboratory are guaranteed by a uninter-
rupted reference chain which source is the calibration of the Laboratory first line standards at the
national metrological institute.
Tipo Prodotto:
Vibration Analyzer
Product Type:
Analizzatore di vibrazioni
Nome Prodotto:
HD2070
Product Name:
DELTA OHM SRL
35030 Caselle di Selvazzano (PD) Italy
Via Marconi, 5
Tel. [phone] r.a. - Telefax +39.049635596
Cod. Fisc./P.Iva IT03363960281 - N.Mecc. PD044279
R.E.A. 306030 - ISC. Reg. Soc. 68037/1998

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INSTRUMENT OVERVIEW
Block Diagram of HD2070
Block Diagram of the tool
The block diagram represents the main elements of the HD2070 vibration analyzer.
Measure channels
HD2070 has three input channels polarized with direct current at 25V. It is possible to
connect accelerometers with an amplifying integrated electronics IEPE (or similar) type that
needs a maximum current of 2mA. It’s possible to connect to the RIGHT input a tri-axial
type accelerometer or up to three monoaxial accelerometers.
The amplified electrical signal of the three channels is sent to the LINE output.
The instrument
The amplified signal of the three channels is converted into digital samples through as
many 25-bit A/D converters and digitally elaborated by two DSP.
The weighted levels and the related spectra of each channel are then transferred from
the DSP to the microprocessor that manages the display and the storage.
The microprocessor supervises all the instrument processes: the management of the ca-
libration, the Flash memory and the memory card, the display, the keyboard and the serial
multi-standard RS232C/USB interface.
Channels
XYZ
LINE
output
Screen
Keyboard
Memory card
Flash Memory
RS232 Port
USB Port
I/O Trigger

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How to connect the accelerometers to the analyzer
The following diagram illustrates the different parts necessary to connect the accelerometers to
the HD2070. The left input is monoaxial, the right input is triaxial.

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INTRODUCTION
The HD2070 is a portable vibration analyzer able to perform spectral (option
HD2070.O1) and statistical analysis (option HD2070.O2). The instrument can supply all the
measurement parameters required by the current normative concerning the operators pro-
tection from the risk connected with the vibrations and is able to measure in hand-arm
and whole body modes. It is also possible to evaluate the annoyance of persons due to
vibrations in buildings.
The instrument has been designed mixing the easy to use concept with the maximum
flexibility and the possibility to update the instrument with the evolving standards on vibra-
tions. The firmware can be updated directly by the user through the supplied Noise Studio
software (basic version).
HD2070 analyser can perform all measurements requested by technical standards con-
cerning workers protection from the risk of mechanical vibrations exposure.
The HD2070 complies with the specifications of ISO 8041 (2005) and ISO 5349-1 (2001
- vibrations transmitted to the hand-arm system) and ISO 2631-1,2 and 4 (1997 – vibrations
transmitted to the whole body).
The HD2070 is a vibration analyzer suitable for the following applications:
•Evaluation of the exposure of operators to the risk connected with the vibrations trans-
mitted to the hand-arm system through vibrating tools or items subjected to vibrations
or impacts;
•Evaluation of the operator exposure to the risk connected with vibrations transmitted to
the whole body also through the use of movement or transportation ways;
•Evaluation of the operator exposure to the risk connected with vibrations transmitted to
the whole body by buildings subjected to vibrations or impacts;
•Octave or third-octave bands spectral analysis (option HD2070.O1);
•Statistical analysis with calculation of the percentile levels from L1to L99 (option
HD2070.O2);
•Attenuation of vibrations and reclamations.
The HD2070 analyzer simultaneously acquires the acceleration value in 3 channels
and calculates, in parallel for all channels, both the weighted acceleration values and the
octave or third-octave bands spectra (option HD2070.O1). In addition to the instant and
average acceleration values, the analyzer also elaborates peak levels, vibration dose (VDV)
and crest factors. The frequency weighting can be chosen freely according to the specific ap-
plication.
The possibility to connect any type of accelerometer with integrated electronics (type
IEPE or compatible), both triaxial and monoaxial, ensures the maximum ease of use and re-
duces the possibility of making mistakes or taking measures affected by electromagnetic
interference or noise.
A versatile data logging function stores in the 8MB internal flash memory or, by user’s
selection, in the memory card (SD up to 2GB), multiple profiles and optional spectra. Moreover
it is possible to add to the profiles acquisition, also the digital samples recording of accelero-
meters signal (option HD2070.O3). When analyzing the memorized data, it is then possible to
examine the signals provided by the accelerometers and calculate additional parameters or ve-
rify the absence of source of errors such as those due to the DC-shift phenomenon. Each
recording can be associated with a vocal comment. Using the available audio channel, it is
possible to record an audio signal up to one hour, as a further opportunity to document the
measures.
The performed recordings can be reviewed using the provided "Memory Navigator"
program of the HD2070 analyzer. The vocal comments associated with the recordings can be
listened using the appropriate headphones output.

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The LINE type unweighted analog outputs allow to record, for subsequent analysis, the
accelerometers signal on a tape or directly in a PC with an acquisition board.
The calibration can be done using the accelerometers calibration data or using a vibra-
tions generator able to produce a known and stable acceleration. A reserved and protected
area in the permanent memory is used to record the last 120 calibrations performed. The sup-
plied Noise Studio interface software allows to control the instrument and accelerometers and
to document the measurements by downloading automatically the register file of the instru-
ment calibrations.
In order to easily carry out the different measurements on the field, in the HD2070 it is
possible to store up to 10 customizable and editable setups, also using the Noise Studio
software. A title is associated with each setup in order to easily choose the desired one.
Considering that in order to measure in every possible situation it is necessary to use dif-
ferent types of accelerometers, up to 9 different sensor configurations both for triaxial and
for monoaxial sensor can be selected based on the requirements. The sensors calibrations and
configurations files are associated with the analyzer setups, so that, by choosing one of the
stored setups, the sensors to be connected to the input channels are indicated and the last as-
sociated calibration values are automatically uploaded.
The check of the vibration analyzer functionality can be done directly by the user, in the
field, thanks to a diagnostic program.
HD2070 can be completely controlled by a PC through the RS232 and USB serial inter-
faces, using an adequate communication protocol.
The Noise Studio interface software allows to download and display data stored in the
instrument, to handle the files related to setups, calibrations and configurations. With the
software it is possible to load in the analyzer up to 10 different setups, chosen among the
available ones. The file related to calibrations is downloaded at every connection and it is
saved together with the measurement data. The different sensors configurations can be pro-
grammed through the PC, both inserting manually the accelerometers data and also using the
proper CD-ROM associated with the accelerometers that can be supplied by Delta Ohm togeth-
er with the instrument.
HD2070.O1 option: “Spectral analysis”
Simultaneously to the acquisition of the profiles, it is performed the octave or third-
octave bands real time spectral analysis (option HD2070.O1). The vibration analyzer
calculates the spectrum of the sound signal every second and integrates it linearly up to 99
hours. It is also possible to associate with the spectrum a frequency weighted measurement
parameter whose value is calculated from the acceleration values of each octave or third-
octave spectrum band. In addition to the acceleration values for each band of the spectrum, it
is possible to display the speed or displacement value.
The choice to measure hand-arm (HA) or whole-body (WB and BV) modify the extension of
the spectral analysis: while for the hand-arm measures the frequency range extends from
3.15Hz to 3.15kHz (from 4Hz to 2kHz octave band spectrum), for whole-body measurements
the range of the central frequency is shifted towards low frequencies from 0.315Hz to 315Hz
(from 0.5Hz to 250Hz in octave bands) .
The octave and third-octave filters comply with the class 1 specifications of IEC 61260.
HD2070.O2 option: “Statistical analysis”
As statistical analyzer (option HD2070.O2), the HD2070 calculates the probability
distribution of a measurement parameter at choice and analyzes it in classes of 1dB. In
addition to the chart of probability distribution, it is also supplied the graph with percentile
levels from L1to L99.

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HD2070.O3 option: “Digital recorder”
With this option it is possible to store, in parallel with the weighted acceleration profiles
and eventually the frequency spectra, also the signal’s digital samples recording. When analyz-
ing the stored data, it is then possible to examine the signals provided by the accelerometers
and calculate additional parameters or verify the absence of source of errors such as those due
to the DC-shift phenomenon.

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DESCRIPTION OF DISPLAY MODES
The acceleration values and the calculations made by the HD2070 analyzer are presented
in 5 different screens. The instrument analyzes simultaneously the acceleration signals on 4
axis associated with three measurement channels CH1, CH2 and CH3. It is possible, in each
screen, to choose the channel to display by simply pressing the CHN key.
When the instrument is switched on, it briefly shows the Delta Ohm logo and the pro-
gram version. Then it is requested the selection of the configuration for the sensors connected.
Press PREV or NEXT to scroll the memorized sensor list, SEL to confirm.
Then, the instrument enters the VLM (Vibration Level Meter) mode, displaying in numeri-
cal form 3 instant or integrated measurement parameters.
If there is an external memory card, after the initial screen, the configuration files are
loaded and the following screen appears:
Press RD/WR to enable all the reading and writing functions and continue with the se-
lection of the configurations.
Now the instrument is ready for the use (for the details about the sensors setup, see the
SENSORS SETUP program description).
MC installed
and ready.
Size: 1000 MB
ESC RD RD/WR
CONFIG. RIGHT #02
PROD: DELTA OHM
MOD: ACC_TRI
S.N.: 123456
TYPE: ACC TRI
SENS: 10mV/g CAL
RANGE: 500 gpk
SEL. PREV. NEXT.

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The possible screen modes are:
•VLM (Vibration Level Meter): divided into four screens with three measurement pa-
rameters each. The values displayed in numerical form are updated every second.
oVLM_1: 3 profiles of instant or integrated measurement parameters calculated on
each of the three channels;
oVLM_2: 3 profiles of instant or integrated measurement parameters calculated on
the vector built with the data of the three channels
oVLM_3: 3 parameters integrated in all the measurement time and calculated on
each of the three channels;
oVLM_4: 3 parameters integrated on all the measurement time and calculated on
the vector built with the data of the three channels.
•PROFILE: graphical form profile of a chosen parameter, related to the acceleration on
each channel calculated at programmable intervals from 1s to one hour. The last 100
values of the chosen parameter are visualized.
•SPECTRUM (option HD2070.O1): graph of the octave or third-octave bands spectrum
graphic, related to the acceleration on each channel. A wide band parameter, calculated
from the measured spectra, is associated with the spectrum. In addition to the accelera-
tions, it is possible to visualize the speeds or the displacements, making a single or
double integration on the spectrum. The spectrum can be visualized in multi-spectrum
mode (MLT: one spectrum per second) or in averaged spectrum (AVR) where the spec-
trum is linearly integrated in all the measurement time.
•PROBABILITY (option HD2070.O2): graph of the probability distribution of the para-
meter visualized in the PROFILE screen for each channel. The values are analyzed in
classes of 1dB.
•PERCENTILES (option HD2070.O2): graph of percentile levels related to the parame-
ter visualized in the PROFILE screen for each channel.
The transition from one screen to the next one can be made at any time by pressing the
MODE key. At start-up, after the selection of the input configuration, the instrument displays
the VLM screen.
Some indications appear in all the modes, they are:
The indicator of the acquisition status,
The overload indicator,
The indicator of the remaining batteries charge.
The first symbol in the top left corner of the display indicates the acquisition status
of the vibration analyzer.
RUN: the instrument is acquiring.
PAUSE: the calculation of the integrated measures and the eventual measures recording are
paused. The instant parameters continue to be measured and visualized.
Current Overload
Overload memory
Subfield memory
Current subfield
RUN
PAUSE
REC
STOP
Hold
Print
Replay

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REC: The instrument is acquiring and recording.
STOP: the instrument does not perform any measurement.
H (HOLD): the calculation of the integrated measurements has come to the end of the inte-
gration interval or the HOLD key was pressed.
P (Print): the printing of the current data is running.
R (Replay): it appears (blinking) when the “MEMORY NAVIGATOR” program is used to display
a file saved in the instrument memory.
Immediately to the right of the symbol indicating the acquisition mode, there is the sym-
bol indicating the possible overload. An arrow pointing up indicates that the input level has
exceeded the maximum level measurable, a down arrow indicates that the input level is be-
low the minimum according to the selected gain.
The maximum measurable level in the different settings of the measurement range se-
lector is indicated in the technical specifications (see the chapter "TECHNICAL
SPECIFICATIONS").
An internally empty arrow reminds that an overload occurred, while a full arrow indicates
that the signal is currently exceeding the limit.
To the right of the overload indicator it is displayed the integration time Tint of the in-
strument, which is programmable from 1s to 99h. When the integration mode is set to
multiple, the "Tint" symbol in the VLM screen blinks. If Tint = 0, the integration is becomes
continue.
In the upper right corner there is the battery symbol. The batteries discharge appears
as a gradual emptying of the symbol. When the remaining working time of the instrument is
about 10%, which is roughly correspondent to 30 minutes in the continuous acquisition, the
battery symbol blinks. A protective device prevents the instrument from taking measurements
with insufficient charge level and automatically shuts the instrument off when the charge level
is reduced to a minimum.
The charge level of the batteries, expressed in percentage, is visible in the menu main
screen, that can be accessed pressing the MENU key once. Press the MENU key again to return
to the measurement screen.
For details, see the chapter "REPORTING OF LOW BATTERIES AND REPLACEMENT OF
BATTERIES."
Pressing the ENTER key, the parameters related to the visualized screen can be selected
in sequence. While the selected parameter is blinking, it is possible to change it pressing the
UP and DOWN arrow keys. Pressing ENTER, or automatically after about 10s, the parameter is
confirmed and the selection mode is exited.
In graphic visualization mode it is possible to change the parameters of the vertical scale
using the UP, DOWN, LEFT and RIGHT arrow keys: the LEFT and RIGHT keys compress and
expand the vertical scale respectively, the UP and DOWN keys decrease and increase the initial
and final levels of the vertical scale; in this way the graphic is moved upwards and downwards
respectively.

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VLM SCREEN
The VLM screens shows, in numerical form, three frequency weighted parameters related
to each of the three measurement channels or to the acceleration vector calculated with the
data of the first three axes. It is possible to scroll in sequence the screens using the
right and left cursor keys.
The horizontal bar visualizes the instant levels of the three measurement channels ex-
pressed in dB.
VLM_1 and VLM_2
The first two screens VLM_1 and VLM_2 present instant and integrated parameters
that are acquired, and in case memorized, as a profile form with 1 second acquisition inter-
val or integrated with intervals programmable from 10s to 1 hour. In the VLM_2 screen are
visualized the parameters related to the channels of the vector acceleration sum (CHΣ) and
maximum (CHM). The measurement parameters to be displayed can be set entering
the menu Parameters >> Vibration Analyzer.
VLM_3 and VLM_4
The last two screens VLM_3 e VLM_4 present global parameters integrated in all the
measurement period. It is possible to automatically memorize the value of these parame-
ters at the end of each measurement session. In the VLM_4 screen are visualized the
parameters related to the channels of the vector acceleration sum (CHΣ) and maximum
(CHM). These measurement parameters can be set entering the menu Parameters
>> Data Logger >>Global.
To change the measurement unit without entering the instrument menu, it is suffi-
cient to use the RIGHT and LEFT arrow keys. The measurement units are dB, m/s2, cm/s2,
ft/s2, in/s2, g. The measurement unit selected is unique and it is applied to all the visualized
parameters.
The CHN key allows to change the visualized channel. The measurement channels of sin-
gle axis acceleration are three (CH1,CH2 and CH3) while the measurement channels of the
vector acceleration are two: the “sum” vector (CHΣ) and the “maximum” vector (GHM), both
calculated with the data of the first three measurement channels (RIGHT input).
The “sum” vector is defined by the relation:
()( )( )
2
3
3
2
2
2
2
1
1*3*2*1 ch
P
ch
P
ch
P
SOMMA aCaCaCav++=
While the “maximum” vector is defined by the relation:
()( )( )
[]
2
3
3
2
2
2
2
1
1*3,*2,*1max ch
P
ch
P
ch
P
MASSIMO aCaCaCav=
Visualized parameters
Visualized channel
Minimum Level
Maximum Level
Bar indicating the
Instant level
Acquisition time
Integration Interval
Frequency Weighting

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Where:
•C1, C2 and C3 are the multiplying coefficients for each channel that can be set through
the menu Parameters>> Instrument >> Measurement>> Coeff.1, Coeff.2 and Coeff.3
•ach1P1, ach2P2, ach3P3 are pondered acceleration found on each of the three channels. The
frequency weightings are set in the menu Parameters>> Instrument >> Measure-
ment>> Pond.1, Pond.2 and Pond.3.
From the menu (MENU>> Parameters>> Instrument >> Measure>> Ch1-3), it is poss-
ible to disable one or more measurement channels, for example because they are not in
use. The status of each channel is indicated in the menu with a number: 0 (zero) indicates a
disabled channel, 1 indicates an active channel.
The three channels are indicated in the order CH1, CH2, CH3: in order to have all the
channels activated, the menu item must be Ch1-3=111. To disable the CH1 channel, for
example, the menu item must be Ch1-3=011. It is not possible to disable all the channels
at the same time.
When one or more of the channels CH1, CH2 or CH3 are disabled, the measure-
ments related to the “sum” and “maximum” vector are not visualized on the display.
The visualized measurement parameters can be changed without entering the menu of
the instrument. Pressing the ENTER key while the instrument is in STOP mode, the di-
rectly editable parameters can be scrolled in sequence. When the selected parameter
blinks, it is possible to modify it using the UP and DOWN arrows.
The changeable parameters are:
•Integration time (Menu >> Parameters >> Instrument >> Measurement >> Integra-
tion Interval).
Settable from 1s to 99 hours (when it is set to 0 the integration is continuous). Pressing
the RIGHT arrow while the value is blinking, the multiple integration mode is selected
(Menu >> Parameters >> Instrument >> Measure >> Integration Mode). To set the
single integration mode, it is sufficient to press the LEFT arrow. When the integration
mode is multiple, the symbol “Tint” blinks to indicate that the instrument will execute
many integration intervals in sequence, each of them with a duration equal to the inte-
gration time set.
•The three measurement parameters of acceleration (Menu >> Parameters >> Vi-
bration Analyzer) for the three parameters related to each channel, to sum vector and
maximum value associated with VLM_1 and VLM_2 screens. For VLM_3 and VLM_4
screens, the acceleration measurement parameters changeable directly, are the ones in
Menu >> Parameters >> Data Logger >> Global.
When one of the acceleration measurement parameters is selected, the parameter sym-
bol blinks. Pressing the UP and DOWN arrows it is possible to scroll in sequence all the
measurement parameters available.
•The frequency weighting applied to each measurement channel (Menu >> Parameters
>> Instrument >> Measure >> Pond. Ch-x with x=1,..,4). While the frequency weight-
ing symbol blinks, it is possible to modify the weight using the UP and DOWN arrows. The
weighting can be changed only in VLM_1 and VLM_3 screens. The VLM_2 and VLM_4
screens report the abbreviation of the weightings applied to the three channels CH1, CH2
and CH3: e.g. “zch” means CH1=Fz, CH2=Fc and CH3=Wh.

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PROFILE SCREEN
This screen presents in graphic form the profile of a frequency weighted parameter re-
lated to each of the 3 measurement channels.
The values can be visualized in dB or in m/s2(Menu >> Parameters >> Instrument >>
Measure >> Measurement Unit).
The CHN key allows to change the visualized channel.
With the LEFT and RIGHT arrow keys it is possible to change the vertical scale
of the graph while with the UP and DOWN arrow keys it is possible to choose the
reference value of the vertical scale.
It is possible to activate two cursors to read the value in two points at choice of the
graph. Pressing the CURSOR key once, the first cursor is activated, pressing the second time,
the second cursor is activated while pressing the CURSOR key the third time, both cursors are
activated in tracking mode. To place the cursors in the desired points, the arrow keys next to
the CURSOR key can be used.
Using the HOLD key, the graph updating is paused, allowing a comfortable reading of
the measured values. Press again the HOLD key to return to real time visualization.
The sampling time of the graph can be selected from 1s up to 1 hour per point.
The parameter selected for this screen is the same used for the statistical analysis (see
PROBABILITY and PERCENTILES screens) with a 1s sampling interval.
The visualized measurement parameters can be modified without entering the menu of
the instrument. Pressing the ENTER key while the instrument is in STOP mode, the di-
rectly changeable parameters can be scrolled in sequence.When the selected
parameter blinks, it is possible to modify it using the UP and DOWN arrows.
The changeable parameters are:
•The acceleration measurement parameter (Menu >> Parameters >> Vibration Ana-
lyzer >> Profile). Pressing the UP and DOWN arrows, it is possible to scroll in sequence
all the measurement parameters available.
•The sampling interval of the measurement parameter (Menu >> Parameters >> In-
strument >> Measurement >> Sampling Profile). It can be set from 1s up to 1 hour.
•The integration interval (Menu >> Parameters >> Instrument >> Measurement >>
Integration Interval). It can be set from 1s to 99 hours (when it is set to 0, the integra-
tion is continuous).
•The frequency weighting (Menu >> Parameters >> Instrument >> Measurement
>>Wh. Ch-x with x=1,..,3). The parameter is associated with the measure channel vi-
sualized. To modify it, use the UP and DOWN arrows.
Selected Channel
Minimum Level
Scale Facto
r
Maximum Level
Visualized Paramete
r
Integration Interval Integration Time
Profile
Frequency Weighting
Sampling Interval

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SPECTRUM SCREEN (OPTION HD2070.O1)
The SPECTRUM screen presents in graphic form the octave or third-octave bands spec-
trum related to each of the 3 measurement channels. The order of the visualized spectrum, in
octave or third-octave bands, is set entering the Menu >> Parameters >> Spectrum Analyzer
>> Order.
The values can be visualized in dB or in m/s2.
The CHN key allows to change the visualized channel.
With the LEFT and RIGHT arrow keys it is possible to change the vertical scale
of the graph while with the UP and DOWN arrow keys it is possible to choose the
reference value of the vertical scale.
The spectral analysis is made both in multi-spectrum mode (MLT), where a spectrum
every second is visualized, and in average spectrum mode (AVR), where the spectrum in-
tegrated in all the measurement time is visualized.
It’s possible to associate with the octave or third-octave bands spectrum, the value of
the frequency weighted acceleration, calculated from the spectrum.
CURSORS OPERATION
It is possible to activate two cursors to read the value of the visualized bands. Pressing
the CURSOR key once, the first cursor is activated, pressing the second time, the second cur-
sor is activated while pressing the CURSOR key the third time, both cursors are activated in
tracking mode. To place the cursors in the desired points, the arrow keys next to the CURSOR
key can be used.
When the cursors function is not active, it is possible to pass from the visualization of the
acceleration for each band to the speed or displacement visualization, pressing in sequence
the left and right cursor keys.
Using the HOLD key, the graph updating is paused, simplifying the reading of the meas-
ured values. Press again the HOLD key to return to the real time visualization.
Keeping pressed the cursors activation key, the limit acceleration curve is
visualized. This curve is based on the acceleration value in the band selected with the cursor
L1 and presents for each band the limit value of the acceleration corresponding to a
displacement equal to that of the selected band.
For example, it is possible to choose as reference band with the cursor L1 the band cor-
responding to the dominant frequency of the spectrum and, supposing that the displacement
component at this frequency is also dominant, visualize the maximum acceleration levels on
the other bands of the spectrum that cause displacement values equal to or lower than the one
of the selected band. Eventual phenomena of DC-shift happen with acceleration values at low
frequencies with unreal associated displacements and so can be easily localized because they
Selected Channel
Minimum Level
Scale Facto
r
Maximum Level
Visualized Paramete
r
Integration Interval Integration Time
Level with a large band
Frequency Weighting
Octave and third octave band
spectrum

- 17 -
will be associated with values of acceleration at low frequencies greater than the visualized
limit.
To disable the limit acceleration curve keep pressed the CURSOR key.
The visualized measurement parameters can be modified without entering the
menu of the instrument. Pressing the ENTER key while the instrument is in STOP mode, the
directly changeable parameters can be scrolled in sequence. When the selected parameter
blinks, it is possible to modify it using the UP and DOWN arrows.
The changeable parameters are:
•The integration interval (Menu >> Parameters >> Instrument >> Measure >> Inte-
gration Interval). It can be set from 1s to 99 hours (when it is set to 0, the integration is
continuous)
•The frequency weighting of the acceleration value associated with the spectrum
(Menu >> Parameters >> Spectrum Analyzer >> Auxiliary weight). This parameter is
changeable also in measuring mode.
•The type of the visualized spectrum MLT or AVR (Menu >> Parameters >> Spec-
trum Analyzer >> Mode). This parameter is changeable also in measuring mode.

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DISTRIBUTION OF PROBABILITY SCREEN (OPTION HD2070.O2 )
The PROBABILITY screen presents in graphic form the probability distribution of the
values of the parameter visualized in the PROFILE screen for each of the 3 channels.
The values can be visualized in dB or in m/s2.
The CHN key allows to change the visualized channel.
With the LEFT and RIGHT arrow keys it is possible to change the vertical scale of the
graph while with the UP and DOWN arrow keys it is possible to choose the reference
value of the vertical scale.
CURSORS WORKING
It is possible to activate two cursors to read the probability in two points at choice in
the graph or, when they are both selected, to calculate the probability to have a value between
the two cursors. Pressing the CURSOR key once, the first cursor is activated, pressing the
second time, the second cursor is activated while pressing the CURSOR key the third time,
both cursors are activated in tracking mode. To place the cursors in the desired points, the
arrow keys next to the CURSOR key can be used.
The statistical analysis is done in 1dB classes, sampling the value of the parameter
selected for the PROFILE screen once per second for each of the 3 channels.
The visualized measurement parameters can be modified without entering the
menu of the instrument. Pressing the ENTER key while the instrument is in STOP mode, the
changeable parameters can be scrolled in sequence. When the selected parameter blinks, it is
possible to modify it using the UP and DOWN arrows.
The editable parameters are:
•The acceleration measurement parameter (Menu >> Parameters >> Vibration Ana-
lyzer >> Profile).
•The frequency weighting (Menu >> Parameters >> Instrument >> Measurement >>
Wh. Ch-x with x=1,..,3). The parameter is associated with the visualized measurement
channel. To modify it, use the UP and DOWN arrows.
Selected channel
Minimum Level
Scale Facto
r
Maximum Level
Visualized paramete
r
Integration Time
Weighting
Probability

- 19 -
PERCENTILES SCREEN (OPTION HD2070.O2)
Percentile screen presents in graphic form the percentile levels from L1to L99 associated
with the parameter visualized in the PROFILE screen for each of the 3 channels.
The values can be visualized in dB or m/s2.
CHN key allows to change the visualized channel.
With LEFT and RIGHT arrow keys you can change the vertical scale of the
graphic while with UP and DOWN arrow keys you can chose the value in reference
with the vertical scale.
CURSORS FUNCTIONS
It is possible to activate a cursor to examine the graph. Pressing the CURSOR key, the
cursor is activated; in order to place the cursor in the desired point, the arrow keys next to the
CURSOR key can be used.
To facilitate the graph viewing, two dashed vertical bars are displayed in correspondence
of 5 and 95%.
The visualized measurement parameters can be modified without entering the
menu of the instrument. Pressing the ENTER key while the instrument is in STOP mode, the
changeable parameters can be scrolled in sequence. When the selected parameter blinks, it is
possible to modify it using the UP and DOWN arrows.
Can be modified:
•The acceleration measurement parameter (Menu >> Parameters >> Vibration Ana-
lyzer >> Profile).
•The frequency weighting (Menu >> Parameters >> Instrument >> Measurement >>
Wh. Ch-x with x=1,..,3). The parameter is associated with the visualized measurement
channel. To modify it, use the UP and DOWN arrows.
Selected Channel
Minimum Level
Scale Facto
r
Maximum Level
Visualized paramete
r
Integration time
Weighting
percentile level

- 20 -
APPLICATIONS
The HD2070 analyzer can measure vibrations in three different applications selectable
with the parameter Menu >> Parameters >> Instrument >> Measurement >> Application:
•Hand Arm (HA) for the measurements of vibrations transmitted to the hand-arm sys-
tem, for example by tools through the grip.
•Whole Body (WB) for the measurements of vibrations transmitted to the whole body,
for example to a driver through the seat.
•Building Vibration (BV) for the measurement of vibrations transmitted to the whole
body by buildings.
In general, different applications require specific accelerometers which differ mainly
for the sensitivity, frequency response, weight and mounting characteristics.
The accelerometers suitable for the HD2070 may be triaxial or mono-axial type with inte-
grated electronics (IEPE or equivalent) and sensitivity from 1 mV/g to 1V/g.
These accelerometers are current-supplied by the analyzer with a bias voltage of 25V and a
maximum current equal to 2mA.
Since the dynamic range of the accelerometer- analyzer chain is limited to about 100dB, in or-
der to perform all types of vibration measurements (hand-arm and whole body vibration or
buildings), accelerometers with different sensitivities are required. In fact, while for the meas-
urement of vibration transmitted to the hand-arm can be used an accelerometer with a
sensitivity from 1 mV/g to 10 mV/g, capable of measuring peak accelerations up to
5000 ÷ 50000 m/s2 , for the measurement of accelerations in buildings it is necessary to
use accelerometers with a sensitivity of 1 V/g, in order to measure accelerations starting from
1 mm/s2.
HAND ARM
Many tools operated or gripped by hands generate vibrations. In some of these tools the
vibration levels can be very high: for example, saws, hammers, grinders, drills, cleaners, vi-
brating plates, mowers, hammers, etc.. The vibration is transmitted to the operator's hands
(and arms) through physical contact with the utensil. In some cases vibration is transmitted
directly by gripping the part to be machined (such as on a column grinder).
The procedures for measuring and assessing exposure of workers to hand-arm vibration
are defined by ISO 5349-1 and ISO 5349-2. For measurements are used accelerometers with a
sensitivity from 1 mV/g to 10 mV/g , reduced size and weight, capable to measure weighted
accelerations of about 1m/s2while, at the same time, very high peak accelerations even higher
than 10000 m/s2. In most practical situations will be used a miniature triaxial accelerometer,
with a sensitivity of 10mV/g and resonant frequency greater than 10kHz. When the peak acce-
lerations exceed 1000g repeatedly, it is necessary to use a shock accelerometer with 1mV/g
sensitivity and resonant frequency greater than 50kHz. In this case also a mono-axial accele-
rometer is enough, taking care to orientate it so as to measure the accelerations along the
dominant axis. For exposure assessment should be considered vibrations being transmitted to
the center of the operator's hand during the tool’s grip
and use. Since normally it is not possible to fix the accele-
rometer in that position, while this would constitute an
obstacle to the operator, the accelerometer is fixed at the
closest position to the one occupied by the hand (so that
it would not constitute a disturbance to the use of the
machine itself). The picture shows the position in which,
according to ISO 5349-2, the accelerometer is attached to
the handle of hammers and chipping hammers. In some
cases, for the particular shape of the handles or the over-
all dimensions of the control lever, it is not possible to fix
the accelerometer in accordance with the standard’s guid-
ance. In this case an alternate location in the closest possible location to the operator's hand
will be found. The demolition hammers have two handles, one of which cannot be used to fix