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Hand-held Analyzer 2250 Light – User Manual
The method is based on detection of changes in impedance at the input terminal. It was
developed for monitoring of microphone channels and requires a preamplifier with a small,
extremely stable, built-in capacitor which makes it possible to apply an electrical signal to the
preamplifier (and microphone) input terminal.
A stable CIC Ratio means a ‘healthy’ system and assures stable operation of microphone,
cable, preamplifier and the remaining measurement system.
Fig.5.8
Charge Injection Calibration. Low-leakage resistance capacitor C
c
is set in parallel with
the microphone and fed with voltage e
i
. The ratio e
o
/e
i
is constant when g, C
c
, C
m
and
C
i
are constant. Changes to preamplifier gain (g), cable parameters, microphone
capacitance (C
m
), etc., will change e
o
/e
i
, and hence indicate probable changes in
calibration
5.7.2 Performing a Manual Charge Injection Calibration with the Analyzer
Charge Injection Calibration is only available with Logging Software BZ-7133.
Tap the Main Menu icon and select Calibration from the list. Click the CIC tab to view
the various CIC parameters that are available. These include the results of the latest manual
CIC, together with the reference, see Fig.5.9.
The status field at the top of the screen informs you how to perform the CIC.
Press the Start CIC button to start the CIC. After approximately 10 s you will see the result.
Normally, the CIC Reference Ratio is set the very first time a CIC is performed, however, you
should update the CIC Reference Ratio if you change the microphone preamplifier. You do this
by checking the Use as new Reference checkbox.
The CIC Reference Ratio and CIC Ref. Date parameters display the results of the very first
manual CIC, and this will be used as the ‘reference’ for all subsequent CIC Ratio
measurements.
Note: Each microphone in the transducer database has a CIC Reference Ratio.
If the CIC Ratio parameter deviates by more than 0.5 dB from the CIC Reference Ratio, then
there may be a problem, and this should be investigated.
C
m
C
c
C
i
R
1
Preamplifier
Microphone
Cable Generator
g
e
i
e
o
e
o
e
i
C
c
= g
C
m
+ C
i
+ C
c
( )
970294/1
- Technical 1
- Documentation 1
- Hand-held Analyzer 3
- 2250 Light 3
- Safety Considerations 4
- Table of Contents 5
- APPENDIX A 7
- APPENDIX C 7
- Chapter 1 9
- 1.2.2 Beginners 10
- Chapter 2 11
- 2.2 Instrument Components 12
- CHAPTER 2 13
- 2.3 Analyzer Inputs/Outputs 14
- 2.3.2 Hardware Version 4: 15
- 2.4 Hardware Setup 19
- 2.5 Assembling 2250 Light 20
- Chapter 3 23
- 3.3 Making a Measurement 24
- 3.3.2 Switching On 25
- CHAPTER 3 27
- 3.4 Save your Measurement 29
- 3.6 Switching Off 31
- Chapter 4 33
- CHAPTER 4 35
- 4.2.6 Built-in Help 36
- The ‘Star’ navigation concept 38
- 4.4.2 The Display Screen 40
- Typical screen when 41
- Chapter 5 47
- 5.3 Standard Calibration 48
- 5.3.1 Calibration Settings 49
- 5.4 Calibration History 50
- 5.5 Transducer Database 51
- 5.6 Calibration Reminder 52
- CHAPTER 5 53
- ( ) 54
- Chapter 6 57
- 6.1.2 Navigating in Jobs 58
- 6.3 Recalling Measurements 59
- Example of annotations 60
- Chapter 7 61
- Connection overview 62
- 7.2.1 Connect to Your PC 63
- 2250 home page 64
- On-line display and 66
- Chapter 8 67
- 8.1.2 Power Settings 68
- CHAPTER 8 69
- Power Settings overview 69
- 8.1.3 Regional Settings 70
- 8.1.4 Storage Settings 71
- 8.1.5 Headphone Settings 72
- 8.1.6 Printer Settings 72
- 8.2 Modem/DynDNS Settings 73
- 8.2.3 DynDNS 75
- 8.3 Network Settings 76
- 8.4 Notifications 79
- 8.4.2 Text/SMS Notifications 80
- 8.5 Web Server 81
- 8.6.1 Weather Stations 82
- 8.6.2 GPS Receivers 83
- Chapter 9 87
- CHAPTER 9 89
- 9.3 Troubleshooting 90
- 9.3.4 Touch Screen 92
- 9.3.5 Reset Options 93
- 9.4.1 Accredited Calibration 96
- 9.4.2 Initial Calibration 96
- 9.4.3 Regular Recalibration 96
- 9.4.4 Filter Calibration 96
- 9.4.5 Service and Repair 96
- 9.4.7 Rental 97
- 9.4.8 Training 97
- 9.5.1 Handling the Instrument 97
- 9.5.2 Cleaning the Instrument 97
- 9.5.3 Storing the Instrument 98
- Chapter 10 99
- 10.3 Displaying the Results 100
- CHAPTER 10 101
- Displaying the results 101
- – spectrum screen 101
- Spectrum display 102
- Adjusting the X-axis 102
- Scaling the Y-axis on the 102
- Spectrum table 103
- 10.4 Saving Results 104
- Chapter 11 105
- CHAPTER 11 107
- 11.3 Displaying the Results 108
- 11.3.1 The Profile View 109
- Chapter 12 115
- 12.1.3 Playing the Recording 117
- 12.2 With Logging Software 118
- CHAPTER 12 119
- 12.2.4 Playing the Recording 121
- Chapter 13 125
- 13.3 Setting up the Analyzer 127
- 13.4 Measuring 130
- CHAPTER 13 131
- 13.6 Status Codes (Smileys) 132
- Chapter 14 135
- Microphone 136
- Interface 136
- Inputs/Outputs 136
- Environmental 137
- User Interface 137
- Analysis 138
- Measurement Status 139
- Calibration 139
- Signal Monitoring 139
- Aeq,T,mov 141
- Functions with BZ-7133 142
- CHAPTER 14 143
- Ordering Information 144
- Separately 144
- Compliance with Standards 145
- Appendix A 147
- A.2 Frequency Settings 148
- A.3 Statistics 149
- A.4 Measurement Control 150
- A.5 Logged Broadband 151
- A.6 Logged Broadband (100 ms) 153
- A.7 Logged Spectrum 153
- A.8 Markers 154
- A.9 Signal Recording 155
- A.10 Occupational Health 157
- A.11 Tone Assessment 159
- Appendix B 161
- B.1 Total Measurement 162
- APPENDIX B 163
- B.2 Logged Measurement 165
- General Parameters 168
- Table B.2 Statistics 169
- Appendix C 171
- C.2.2 Calibration History 173
- C.3 Calibration Setup 174
- Appendix D 175
- D.2 Power Settings 176
- D.3 Regional Settings 177
- D.4 Storage Settings 178
- D.5 Headphone Settings 178
- APPENDIX D 179
- D.6 Printer Settings 180
- D.7 Modem/DynDNS Settings 181
- D.8 Network Settings 182
- D.9 Notification Settings 184
- D.10 Remote Access Settings 186
- Appendix E 187
- APPENDIX E 189
- Numerics 197
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