CEMB N330 User manual

Via Risorgimento, 9
23826 –Mandello del Lario (LC) –ITALY
www.cemb.com
N330
ROTORS BALANCER –SINGLE AND DOUBLE PLANE
PORTABLE VIBROMETER
SPECTRUM ANALYZER
USER MANUAL
Rev. 03/2021 EN
Translation of the original instructions

Index 1
N330 rev. 03/2021 EN Index
Chapter 1 - General description
Standard accessories................................................................................1 –1
Optional accessories ................................................................................1 –3
Connections .............................................................................................1 –4
Input A and B (vibration sensor –BLUE and RED inputs).........................1 –5
Input Tacho (photocell sensor –YELLOW input)......................................1 –5
Status LEDs...............................................................................................1 –5
Battery .....................................................................................................1 –6
General advice .........................................................................................1 –6
Chapter 2 - General layout
Keys/buttons available on the control panel...........................................2 –1
ON/OFF button............................................................................2 –1
OK button....................................................................................2 –2
Function keys ..............................................................................2 –2
Arrow keys...................................................................................2 –2
Tab key ........................................................................................2 –2
Screen description ...................................................................................2 –3
Chapter 3 - Home screen (menu)
Chapter 4 -OVERALL vibrometer mode
OVERALL Vibrometer –measurement screen ................................. ……..4 –1
Measurement of an OVERALL vibration ...................................…………….4 –1
MENU function ..................................................…………………………………..4 –3
Save measure ............................................... ……………………………4 –3
Open measure.............................................. ……………………………4 –3
Measure setup ............................................. ……………………………4 –3
Take screenshot ........................................... ……………………………4 –3
Chapter 5 -1xRPM vibrometer mode
1xRPM Vibrometer (filtered measure) –measurement screen……..……..5 –1
Measurement of a 1xRPM vibration........................................ .…………….5 –1
MENU function ..................................................…………………………………..5 –3
Save measure ............................................... ……………………………5 –3
Open measure.............................................. ……………………………5 –3

2 Index
Measure setup.............................................. ……………………………5 –3
Take screenshot............................................ ……………………………5 –3
Chapter 6 -FFT mode –Fast Fourier Transform
Spectral analysis (FFT) –measurement screen .................................…….6 –1
Measurement of a FFT spectra .................................................…………….6 –2
Management of a the X-Y axis of the graph...............................……………6 –3
MENU function...................................................…………………………………..6 – 3
Cursor mark .......................................... ……………………………………6 –3
Peak list ........................................……………………………………………6 –5
Save measure ............................................... ……………………………6 – 5
Open measure.............................................. ……………………………6 –5
Measure setup.............................................. ……………………………6 –5
Autoscale.............................................. ……………………………………6 –5
Take screenshot ........................................... ……………………………6 –5
Chapter 7 -“SMART ANALYSIS”mode
“SMART ANALYSIS” –measurement screen ..................... ……………………7 – 1
Setting the type of machine to be analyzed ......................................……7 – 2
Setup “CUSTOM SMART ANALYSIS”...................................................……7 – 4
Setting the rotation speed detecting mode ............. ……………………………7 – 5
Photocell....................................................... ……………………………7 –5
Manual entry ........................................................ ……………………7 – 5
Auto detection.............................................. ……………………………7 – 6
Detection of a “SMART ANALYSIS”measure .....................................……7 –7
MENU function.................................................. ……………………………………7 – 8
Save measure ............................................... ……………………………7 –8
Open measure.............................................. ……………………………7 –8
Change machine setup ......................................... ……………………7 –8
Change speed detection setup…… ............................................. 7 –8
Take screenshot ........................................... ……………………………7 –8
Chapter 8 -“SPINDLE ANALYSIS”mode
“SPINDLE ANALYSIS” –measurement screen ................... ……………………8 –1
Setting the type of spindle to be analyzed......................................... ……8 –2
Detection of a “SPINDLE ANALYSIS”measure....................................……8 –5
MENU function.................................................. ……………………………………8 –7
Save measure ............................................... ……………………………8 –7
Open measure.............................................. ……………………………8 –7
Change spindle setup ........................................... ……………………8 –7
Take screenshot ........................................... ……………………………8 –7

Index 3
Chapter 9 -“CBA” mode
“CBA” – measurement screen ...........................................……………………9 –2
Measurement of a “CBA” value ......................................................... ……9 –2
CEMB limits / custom limits ............................................................... ……9 –3
MENU function ................................................. ……………………………………9 –5
Save measure ............................................... ……………………………9 –5
Open measure.............................................. ……………………………9 –5
Take screenshot ........................................... ……………………………9 –5
Activate custom limits
Back to CEMB default limits......................... ……………………………9 –6
Chapter 10 -Grinding wheel balancer mode
Function access menu......................................................……………………10 –2
New project –BALANCING SETUP ................................................... ……10 –2
Open project ........................................................... ……………………………10 –3
Delete project ......................................................... ……………………………10 –4
Use current project................................................. ……………………………10 –5
Calibration sequence .............................................. ……………………………10 –5
Initial run: spin with evenly spaced sliding weights. ………………10 –5
Test run: spin with a known weight in known position……………10 –7
Correction run: spin with sliding weights
in balancing position .................................. ……………………………10 –9
MENU function ............................................. ……………………………………10 –13
Save project.............................................. ……………………………10 –13
Take screenshot ....................................... ……………………………10 –14
Chapter 11 -Rotors balancing mode
Selection of the balancing project ...................................……………………11 –2
New project –BALANCING SETUP ................................................... ……11 –2
Open project ........................................................... ……………………………11 –4
Delete project ......................................................... ……………………………11 –5
Use current project................................................. ……………………………11 –6
Calibration sequence .............................................. ……………………………11 –6
Initial run............................................................... …………………11 –6
Test run: known weight in known position.............. ………………11 –8
Correction runs ........................................ ……………………………11 –11
MENU function ............................................. ……………………………………11 –13
Save project.............................................. ……………………………11 –13
Back to calibration ................................... ……………………………11 –14
Split correction......................................... ……………………………11 –14

4 Index
Angular components ................................ ……………………………11 –16
Balancing report ....................................... ……………………………11 –17
Warnings on Permissible Unbalance accordingly to ISO 21940-11……11 –19
Chapter 12 -“TACHO” mode
“TACHO” – measurement screen.................................... ……………………12 –1
Measure of a “TACHO” value........................................................... ……12 –2
MENU function................................................……………………………………12 –2
Take screenshot ......................................... ……………………………12 –2
Chapter 13 - Setup mode
Sensor setup.......................................................................................... 13 –1
Sensor type................................................. ……………………………13 –1
Sensor “B”................................................... ……………………………13 –2
Sensor “A”sensitivity / Sensor “B”sensitivity ... ……………………13 –2
Measure setup ...............................................…………………………………….13 –3
Measurement unit..................................... …………………………….13 –3
Unit mode.................................................. …………………………….13 –3
Frequency unit............................................ ……………………………13 –4
Max frequency.................................................... ……………………13 –4
Number of lines..................................……………………………………13 –4
High pass frequency ...........................……………………………………13 –5
Number of averages ........................................... ……………………13 –5
Device setup...................................................…………………………………….13 –6
Date / Time......................................... ……………………………………13 –6
Language ............................................……………………………………13 –7
LCD backlight ...................................................... ……………………13 –7
Device info.................................................. ……………………………13 –7
Firmware upgrade .............................................. ……………………13 –7
Setup custom machine...................................…………………………………….13 –9
Open list ............................................................. ……………………13 –9
Create new ....................................................... ……………………13 –10
Chapter 14 –General purpose functions
General purpose functions.................................................................... 14 –1
Functions associated with the measuring phase ..................... 14 –1
Function “Save measure” .......................................................... 14 - 1
Function “Open measure”........................................................ 14 –3
Function “Measure setup” ....................................................... 14 –4
Function “Take screenshot” ..................................................... 14 –4

Index 5
Appendix A -Technical data
Appendix B -Judgment criteria on industrial machines (ISO 10816)
Appendix C -Judgment criteria on machine tool spindles (ISO 17243)
Appendix D -A rapid guide to interpreting a spectrum
Appendix E -Photocell for instruments Nx30
Appendix F -The JSON format
Appendix G -Balancing accuracy of rigid rotors

6 Index
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General description 1 - 1
Chapter 1
General description
The N330 instrument is supplied, together with its accessories, in a special case. It is advisable,
each time the instrument is used, to place back it in its case in order to avoid risk of damage
during transit.
Standard accessories:
DESCRIPTION
No. 1 accelerometer transducer 100mV/g
No.1 connection cable, length 2 meters, for accelerometer
No.1 magnetic base Ø 25 mm

1- 2 General description
No.1 probe
Photocell complete with stand and magnetic base
Roll of reflecting paper
No.1 angle rule
No.1 micro USB cable
No.1 battery charger with multiplug adapters
No.1 HEAVY DUTY carrying case
No.1 USB key containing instruction manual in PDF format
"Quick Guide" booklet with basic operations for use
"Quick Guide" booklet specific for grinding wheels balancing
procedure
"Quick Guide" booklet specific for rotors balancing
procedure

General description 1 - 3
Optional accessories:
DESCRIZIONE
Connection cable, length 5 meters, for accelerometer
Extension cable, length 10 meters, for transducer/photocell
No. 1 accelerometer transducer 100mV/g additional
No.1 connection cable, length 2 meters, for accelerometer
additional
No.1 magnetic base Ø 25 mm additional
No.1 probe additional

1- 4 General description
Connections
1
2
3
4
5
1. battery charger
2. micro USB port (useful for connecting the instrument to a PC and sharing a folder for the
exchange of data between the two elements)
3. connector for photocell input (YELLOW connector)
4. connector for sensor input –channel A (BLUE connector)
5. connector for sensor input –channel B (RED connector)
To connect the sensor or the photocell, insert the connector (type M12 male) into the
corresponding socket, screwing it clockwise until it is locked, as shown in the figure below.
To extract the connector, instead, unscrew anticlockwise until it is completely
extracted.

General description 1 - 5
Input A and B (vibration sensors –BLUE and RED inputs)
CONNECTOR
PINOUT
1 –GROUND + SHIELDING (SIG-)
2 –SENSOR INPUT (SIG+)
3 –SENSOR POWER SUPPLY)
Input TACHO (photocell sensor –YELLOW input)
CONNECTOR
PINOUT
1 –+24 VDC
5 –TACHO IN
8 –GROUND + SHIELDING
Status LEDs
The keypad panel includes a LED, positioned between the display and the keyboard. The
operating principle is as follows:
LED COLOR
LED STATUS
DESCRIPTION
ORANGE
Slow flashing
The instrument is acquiring the measure
GREEN
Steady
Battery charging in progress
RED
Steady
Battery flat
Fast flashing
Battery almost flat
GREEN/ORANGE
Slow flashing
The instrument is acquiring the measure with
battery charger connected

1- 6 General description
Battery
The N330 instrument is provided with a built-in rechargeable lithium battery, which allows
autonomy of more than 8 hours under normal operating conditions of the instrument.
The battery status is indicated by an icon in the upper right hand corner of the screen.
BATTERY
INDICATOR
DESCRIPTION
Battery fully charged
Battery partly charged
battery almost flat (battery life remaining when this appears is
approx. 2 hours)
Battery flat: recharge within 45 minutes
Battery in charge
Caution:
It is strongly recommended to recharge the battery with the instrument switched off:
as recharging is completed within less than 4 hours such precaution prevents the
battery charger from being connected for an excessively long period of time (max. 12
hours).
Caution:
The lithium battery is able to withstand the recharging-discharging cycles, even on a
daily basis, without problems but it could become damaged if allowed to be fully
discharged. For this reason it is advisable to recharge the battery at least once every
three months, even in the case of extended idle period.
Note:
When the battery is being charged, the status LED will be steady green (see Status
LEDs 1-4). When the battery is charged, the LED will switch off.
General advice
Keep and use the instrument far from sources of heat and strong electromagnetic fields
(inverters and high-power electric motors).
Measurement accuracy could be impaired by the connection cable between the transducer
and instrument, therefore it is recommended to:
not allow such cable to have sections in common with power cables;
prefer a perpendicular arrangement when overlapping power cables;
always use the shortest possible length of cable; in fact floating lines would act as
active or passive antennae.

General layout 2 - 1
Chapter 2
General layout
Keys/buttons available on the control panel
The control panel of the CEMB N330 instrument incorporates a keypad where the various keys
or buttons can be subdivided by function:
ON/OFF button
Press this button to switch the instrument on; hold it down for at least 3 seconds to
switch it off , then release the button.
Note:
After pressing , the instrument is ready for use only at the end of the
switching on procedure, signaled by the appearance of the home screen (see
Chap. 3).
Note:
After the instrument has been switched off, about 5 seconds must pass before
it can be switched back on again.

2- 2 General layout
Caution:
In case the instrument no longer responds to any command, it can be turned off by
keeping the button pressed for about 12 seconds.
OK button
Pressing this button in a setup screen confirms the settings selected, and allows
switching to the next screen. In a menu frame, the selected item is confirmed, while
in a measuring screen it has the function of start/stop the measurement (see 14-1
Start / Stop acquisition).
Function keys
The F1 and F2 keys are at the top of the keypad, below the display. In the various
screens they can perform different functions, indicated in the boxes at the bottom of
the display, directly above these two buttons.
Arrow keys
Allow to move within the items of the instrument main menu and the menu of each
individual function.
Viewing an FFT chart, they allow the zoom of X axis ( , ) and Y axis Y ( , ).
In the Setup screens, they allow the choice of the parameter to be modified ( , ),
once the parameter has been chosen ( , ).
Tab key
In the measurement functions, its pressure changes the channel shown on the
display, switching from channel A to B and vice versa. The channel displayed can be
identified by the symbol placed in the upper left corner of the display (see 2-3 Screen
description).
It can only be used in the rotors balancing function; its pressure switch the display
representation of the correction from plane 1 to plane 2 and vice versa. (see 14-1
Start / Stop acquisition).

General layout 2 - 3
Screen description
1. battery charge level (see 1-5 Battery)
2. measure/function type
3. date and time
4. sensor sensitivity set on Setup Sensors (see 13-2 Sensor sensitivity "A" / Sensor
sensitivity "B")
5. measurement channel displayed
(the symbols and recall the color of the displayed channel –see 1.4 Connections)
6. main screen content - graphical representation of the measurement
7. information/indications on the measure
8. function corresponding to the F1 key
9. function corresponding to the F2 key
10.F2 key
11. F1 key
1
3
6
7
9
11
2
4
5
8
10

2- 4 General layout
Empty page

Home screen (menu)
3 - 1
Chapter 3
Home screen (menu)
After fully switching on the N330 instrument, it shows its Home screen.
which, besides showing a set of information as:
current date and time
battery charge state
as a normal menu, it also proposes and allows selection of the available functionality, namely:
ICON
NAME
DESCRIPTION
VIBROMETER
measurement of the overall value of vibration
VIBROMETER
1xRPM
measurement of the synchronous value of vibration
(1xRPM)
FFT
(Fast Fourier
Transform)
splitting of the vibration into its component frequencies
display of waveform of the vibration

3 - 2
Home screen (menu)
ICON
NAME
DESCRIPTION
SMART
ANALYSIS
evaluation of vibrations on rotating machines with
power rating over 15kW (according to ISO 10816-3)
evaluation of vibrations on rotating machines with
power rating under 15kW (according to ISO 10816-1)
evaluation of vibrations on rotating machines according
to limits and parameters set by the user (CUSTOM
MACHINE)
measurement of the overall vibration amplitude with
fixed frequency range of 10÷1000Hz and measurements
performed in mm/s RMS
diagnosis on the causes of vibrations
SPINDLE ANALYSIS
evaluation of vibrations on spindles (according to ISO
17243-1 and ISO 17243-2)
measurement of vibration velocity (LTSC) with
frequency range 10÷5000Hz - measurements in mm/s
RMS
measurement of vibration acceleration (STSC) with
frequency range 2÷10kHz - measurements in m/s2
CBA
(CEMB Bearing
Analysis)
evaluation of the bearing condition
TACHO
measurement of the rotation speed of a impeller (by
using the photocell - optional for N130)
GRINDING WHEEL
BALANCER
guided procedure for the balancing in service of the
grinding wheels
ROTORS
BALANCING
guided procedure for the balancing in service of any type
of impeller and rotating machine
static and dynamic balancing
LOAD MEASURE
data management (load or delete the data saved on
instrument N330)
SETUP
setting of the sensors connected to the instrument
setting of the general measurement parameters
setting of the general operating parameters of the
instrument