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