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CHAPTER 17
Low Frequency Option BZ-7234
193
17.3 Building Vibration Measurements
This section describes how to measure Building Vibration parameters. Building Vibration
parameters are measured using Wm or Wmb filters (
Fig.17.4
Wm filters
Low Frequency Option BZ-7234, together with BZ-7222, BZ-7223, BZ-7224 or BZ-7225 and
Accelerometer Type 8344 for low-level measurements, measures the following timed
broadband parameters in addition to the standard measured parameters:
• aW – time-averaged weighted
*
acceleration value
• PeakW – maximum peak of the weighted
*
acceleration value
• aWCrest – crest factor, given by Peak
W
/a
W
• MTVV – maximum of the a
W,1s
values
• KBFmax – maximum of the KBF values
• KBFTm – average of the values of KBFmax
i
, where each KBFmax
i
has been measured
during 30 s
The following instantaneous values are also available:
• aW,1s – maximum time-weighted acceleration value during the latest second with
weighting1) and 1 s exponential time constant
• KBF – instantaneous time-averaged acceleration level with W
m
weighting and with
125 ms exponential time constant
Note: W
m
weighting of the acceleration signal corresponds to using H
KB
weighting on the
velocity signal, as defined in DIN 45669–1
*. Weightings can be either W
m
(whole-body vibration in buildings, all directions) as defined in
ISO 8041:2005 or W
mb
, which is only the band-limiting part of the Wm filter. This is set by the Broadband
(Excl. Peak) parameter.
–80.00
–70.00
–60.00
–50.00
–40.00
–30.00
–20.00
–10.00
0.00
10.00
Gain [dB]
0.0100 0.1000 1.0000 10.0000 100.0000 1000.0000 10000.0000
Frequency [Hz]
W
mb
-Weighting W
m
-Weighting
130806
- Technical 1
- Documentation 1
- Hand-held Analyzer Types 3
- 2250 and 2270 3
- Safety Considerations 4
- Table of Contents 5
- CHAPTER 5 6
- CHAPTER 6 7
- CHAPTER 7 7
- CHAPTER 15 10
- CHAPTER 16 10
- CHAPTER 17 11
- CHAPTER 18 11
- APPENDIX A 11
- APPENDIX B 11
- APPENDIX C 12
- APPENDIX D 12
- APPENDIX E 12
- Chapter 1 13
- 1.2.2 Beginners 14
- Chapter 2 15
- 2.2 Analyzer Components 16
- CHAPTER 2 17
- 2.3 Analyzer Inputs/Outputs 19
- 2.4 Hardware Setup 25
- 2.5 Assembling the Analyzer 26
- Chapter 3 31
- 3.3 Making a Measurement 32
- 3.3.2 Switching On 33
- CHAPTER 3 35
- 3.4 Save your Measurement 37
- 3.5 Document your Measurement 38
- Example of a GPS note 40
- 3.6 Switching Off 42
- Chapter 4 43
- CHAPTER 4 45
- 4.2.10 Built-in Help 47
- The ‘Star’ navigation concept 49
- 4.4.2 The Display Screen 52
- Chapter 5 63
- 5.3.1 Standard Calibration 64
- 5.3.2 Calibration Settings 65
- 5.4 Vibration Calibration 66
- 5.5 Electrical Calibration 66
- 5.6 Manual Calibration 66
- 5.7 Calibration History 66
- 5.8 Transducer Database 67
- 5.9 Calibration Reminder 69
- 5.10.1 Theory of CIC 70
- ( ) 71
- Chapter 6 73
- 6.1.2 Navigating in Jobs 74
- 6.3 Recalling Measurements 76
- Example of metadata 77
- Chapter 7 79
- Connection overview 80
- 7.2.1 Connect to Your PC 81
- 2250 home page 82
- Online display and 84
- Chapter 8 85
- 8.1.1 Display Settings 86
- 8.1.2 Power Settings 87
- 8.1.3 Regional Settings 88
- 8.1.4 Storage Settings 89
- 8.1.5 Headphone Settings 90
- 8.1.6 Multi-user Facility 91
- 8.1.7 Printer Settings 91
- 8.2 Modem/DynDNS Settings 92
- 8.2.3 DynDNS 94
- 8.3 Network Settings 95
- 8.4 Notifications 98
- Table 8.1 Alarm Settings 99
- 8.4.2 Text/SMS Notifications 100
- 8.4.3 E-mail Notifications 101
- 8.5 Web Server 102
- 8.6.2 GPS Receivers 103
- 8.7.1 Metadata 104
- CHAPTER 8 105
- Chapter 9 109
- CHAPTER 9 111
- 9.3 How to Move a License 112
- 9.4 Troubleshooting 112
- 9.4.4 Touch Screen 115
- 9.4.5 Reset Options 115
- 9.5.1 Handling the Analyzer 118
- 9.5.2 Cleaning the Analyzer 118
- 9.5.3 Storing the Analyzer 118
- 9.6.7 Rental 120
- 9.6.8 Training 120
- Chapter 10 121
- Setting the frequency 122
- 10.3 Displaying the Results 123
- Adjusting the X-axis 124
- CHAPTER 10 125
- Scaling the Y-axis on the 125
- Spectrum display 125
- Spectrum table 125
- 10.4 Saving Results 127
- Chapter 11 129
- 11.1 Setting up the Analyzer 130
- CHAPTER 11 131
- 11.2.1 Annotating a Project 133
- 11.3 Displaying the Results 134
- Chapter 12 143
- 12.1 Setting up the Analyzer 144
- CHAPTER 12 145
- 12.3 Displaying the Results 146
- 12.3.1 The Profile View 147
- Chapter 13 149
- CHAPTER 13 151
- 13.1.3 Playing the Recording 152
- 13.2.4 Playing the Recording 155
- Chapter 14 159
- T30 indicated 160
- CHAPTER 14 161
- 14.2 Setting up the Analyzer 163
- 14.2.2 Impulsive Method 164
- 14.2.3 Signal Recording 164
- 14.2.5 Serial Measurements 165
- 14.3 Displaying the Results 167
- 14.3.2 Spectrum 169
- 14.3.3 Decay 171
- 14.5 Quality Indicators 177
- Chapter 15 179
- 15.4 Setting up the Analyzer 183
- 15.4.4 Signal Recording 186
- 15.5 Measuring 187
- 15.8 Status Codes (Smileys) 189
- Chapter 16 191
- 16.2 Connecting Transducers 192
- 16.3 Range Setting 192
- 16.3.1 Underrange/Overload 193
- 16.4.2 Displaying the Results 194
- 16.4.3 Saving Results 195
- 16.5.2 Displaying the Results 196
- 16.5.3 Saving Results 197
- 16.6.2 Displaying the Results 199
- 16.6.3 Saving Results 199
- Chapter 17 201
- G-weighted frequency response 202
- Low Frequency Option BZ-7234 203
- 17.2.2 Displaying the Results 204
- Wm filters 205
- Measurements 206
- Low Frequencies 207
- 17.5.2 Displaying the Results 208
- 17.5.3 Saving Results 209
- Chapter 18 211
- Environmental 213
- ) including 214
- User Interface 214
- Analysis 215
- Annotations 216
- Calibration 216
- Measurement Status 216
- Signal Monitoring 216
- Data Management 217
- Standards 217
- Frequency Analysis 217
- Displays 218
- Generator 218
- Broadband Measurements 221
- Internal Generator 221
- External Generator 221
- Reverberation Time 221
- FFT Based Tone Assessment 225
- (with BZ-7230 Only) 225
- (with BZ-7223/24/25 Only) 225
- G-weighting 226
- Ordering Information 228
- Separately 229
- Service Products 230
- Compliance with Standards 231
- Appendix A 233
- A.1 Input 234
- (Cont.) Input parameters 235
- A.2 Frequency Settings 236
- A.3 Statistics 238
- Software BZ-7227 241
- A.6 Logged Broadband (100 ms) 243
- A.7 Logged Broadband 243
- A.8 Logged Spectrum 245
- A.9 Markers 246
- A.10 Level Trigger 247
- A.11 Triggers 249
- (Cont.) Trigger parameters 250
- A.12 Units 252
- A.13 Signal Recording 253
- A.14 Output Socket Signal 257
- Periods 258
- A.16 Occupational Health 258
- A.17 Generator 260
- A.18 Post-processing 261
- A.19 Tone Assessment 263
- Appendix B 265
- Software BZ-7225 266
- General parameters 281
- Appendix C 285
- C.2 Transducer Database 286
- C.2.2 Calibration History 288
- C.3 Calibration Setup 289
- Appendix D 293
- D.2 Power Settings 294
- D.3 Regional Settings 295
- D.4 Storage Settings 296
- D.5 Headphone Settings 296
- (Cont.) Headphone Settings 297
- D.6 Users 298
- D.7 Printer Settings 298
- D.8 Modem/DynDNS Settings 299
- D.9 Network Settings 300
- (Cont.) Network settings 301
- D.10 Notification Settings 302
- (Cont.) Notification settings 303
- D.11 Remote Access Settings 305
- Table D.12 306
- Appendix E 307
- Numerics 319
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