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NTI_Noise_Curves_Application_Tool_V2-11

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					                                        Noise Curves Application Tool
                                                  NTI Americas Inc.
Introduction
                Noise Curves are a common way to measure, quantify or specify audio noise. This Excel-based
                program automates importing of measured data, graphing and assigning a single number value
                representation to the measured data. Up to 2 files may be checked and compared.
                This feature is useful for "before and after" or for multi-position room measurements.
                Please note that the Security Warning might pop-up and hide parts of this message. Just click on "OK".

Steps
           1) Perform and save 1 or 2 NTI AL1 Acoustilyzer measurements as .txt files.
              - Recommended A1 set-up: SPL/RTA mode, Octave RTA, FLAT input filter
              - See the AL1 Manual for additional details.
           2) Transfer the measurement files to the PC using MiniLINK.
              - Note the locations where the files are stored.
              - See the NTI MiniLINK Manual for additional details.
           3) Start the Noise Curves Application Tool and enable Excel macros
              - Start the Noise Curves Application Tool. If you are reading this in Excel, the tool is already running.
              - Depending on your version of Excel, enable macros:
                - in Excel 2003, there might be a Macro Security Warning pop-up window. Click on "OK".
                Use tools/macros/security pull-down menu to get to the Security Level choices.
                If the level is set to "low", just click on "OK" and proceed to step 4 below.
                If the level is set to other than "low", choose 'low" level, click on "OK".
                Apply the new security level by closing the Noise Curves Application Tool, then reopening it again.
                Note: The security code for your entire computer will remain "low" until you change it.
                Please note that the Security Warning might pop-up and hide parts of this message. Just click on OK.
                - in Excel 2007 in Compatibility Mode, there is a Security Warning under the Worksheet Menu bar.
                Click on "Options". In "Security Alert - Macro" pop-up, choose "Enable this content" and click on "OK"
           4) Import, graph and analyze the measurements
              - Use worksheet tabs (bottom of the window) to choose the noise curve worksheet of interest.
              - Click on the “Load File 1”. If the browser does not appear, the computer security is not set properly.
              - Browse the PC to find and highlight the first measurement file.
              - Click on “Open” to open the file and import the measured data.
           5) If desired, add the data from the second measurement file
              - Click on the “Load File 2” and repeat the process.
              Please note that RC (Room Criteria) only imports and analyzes a single measurement file.
              Showing two measurement files would make the graph too busy.

Results
                The imported measurements have been entered into all NC worksheets.
                Worksheet tabs can be used to view results using different noise curve criteria.
                The displayed file names are extracted from AXXX designations inside the measurement files.
                Full external file names are listed in the results to the right of the extracted file names.
                External file can be renamed to document the locations or other important measurement information.
                "SPL" or "LEQ" buttons near the top of the worksheets can be used to choose the data for analysis with:
           1)   NC (Noise Criteria) Curves
           2)   NR (Noise Rating) Curves
           3)   PNC (Preferred Noise Criteria) Curves
           4)   RC (Room Criteria) Curves




        Noise Curves Application Tool                       Instructions                                           Rev. V1.5
NC Curves Results and Data
                          A016: ANU137_A016_SPL_RTA                                                             N
                                                                                                  NC Test Value =C 35

                          A017: ANU137_A017_SPL_RTA                                                             N
                                                                                                  NC Test Value =C 50


                                                                 NC Curves
               90.0
                                                                                                                                        Limit MiniSPL

                                                                                                                                        Limit M2010
               80.0
                                                                                                                                        NC 70

               70.0                                                                                                                     NC 65

                                                                                                                                        NC 60

               60.0                                                                                                                     NC 55

                                                                                                                                        NC 50
               50.0
   SPL in dB




                                                                                                                                        NC 45

                                                                                                                                        NC 40
               40.0
                                                                                                                                        NC 35

                                                                                                                                        NC 30
               30.0
                                                                                                                                        NC 25

               20.0                                                                                                                     NC 20

                                                                                                                                        NC 15
                                                              Limit MiniSPL
               10.0                                           Limit M2010                                                               A016:

                                                                                                                                        A017:
                0.0
                  63 Hz           125 Hz     250 Hz         500 Hz           1 kHz      2 kHz           4 kHz           8 kHz

                                               Octave Band Center Frequency



Data and Computations

                          63 Hz     125 Hz   250 Hz   500 Hz     1 kHz       2 kHz    4 kHz     8 kHz      NC Value         NC Value
NC 70                      83         79      75       72            71        70      69        68
NC 65                      80         75      71       68            66        64      63        62
NC 60                      77         71      67       63            61        59      58        57
NC 55                      74         67      62       58            56        54      53        52
NC 50                      71         64      58       54            51        49      48        47                                     50
NC 45                      67         60      54       49            46        44      43        42
NC 40                      64         56      50       45            41        39      38        37
NC 35                      60         52      45       40            36        34      33        32              35
NC 30                      57         48      41       35            31        29      28        27
NC 25                      54         44      37       31            27        24      22        21
NC 20                      51         40      33       26            22        19      17        16
NC 15                      47         36      29       22            17        14      12        11
A016:                      35.7      35.4     43.5     32.2      27.1         26.4    26.8      28.2            NC 35
A017:                      41.3      44.0     56.0     46.2      41.7         36.1    34.0      29.5                            NC 50




  Noise Curves Application Tool                                           NC Curves                                                      Rev. V1.5
NR Curves Results and Data
                      A016: ANU137_A016_SPL_RTA                                                                          NR
                                                                                                           NR Test Value = 40
                      A017: ANU137_A017_SPL_RTA                                                                          NR
                                                                                                           NR Test Value = 50


                                                                NR Curves
              140.0
                                                                                                                                 Limit MiniSPL

                                                                                                                                 Limit M2010

              120.0                                                                                                              NR 130

                                                                                                                                 NR 120

                                                                                                                                 NR 110
              100.0                                                                                                              NR 100

                                                                                                                                 NR 90

                                                                                                                                 NR 80
               80.0
  SPL in dB




                                                                                                                                 NR 70

                                                                                                                                 NR 60
               60.0                                                                                                              NR 50

                                                                                                                                 NR 40

                                                                                                                                 NR 30
               40.0
                                                                                                                                 NR 20

                                                                                                                                 NR 10

               20.0                                                                                                              NR 0
                                                               Limit MiniSPL                                                     A016:
                                                                Limit M2010
                                                                                                                                 A017:
                0.0
                 31.5 Hz        63 Hz          125 Hz      250 Hz    500 Hz     1 kHz    2 kHz     4 kHz         8 kHz

                                                        Octave Band Center Frequency


Data and Computations
                       31.5 Hz      63 Hz         125 Hz    250 Hz   500 Hz     1 kHz   2 kHz    4 kHz     8 kHz     NR Value           NR Value

NR 130                     144          138        135        133      131      130     128      127       126
NR 120                     137          130        126        124      122      120     118      117       116
NR 110                     130          122        118        114      112      110     108      107       105
NR 100                     124          115        109        105      102      100      98       96        95
NR 90                      117          107        100        96       93        90      88       86        85
NR 80                      110          99          92        86       83        80      78       76        74
NR 70                      103          91          83        77       73        70      68       66        64
NR 60                      96           83          74        68       63        60      57       55        54
NR 50                      89           75          66        59       54        50      47       45        44                            50
NR 40                      83           67          57        49       44        40      37       35        33            40
NR 30                      76           59          48        40       34        30      27       25        23
NR 20                      69           51          39        31       24        20      17       14        13
NR 10                      62           43          31        21       15        10      7        4         2
NR 0                       55           36          22        12        5        0       -4       -6        -8
A016:                      41.2         35.7       35.4       43.5    32.2      27.1    26.4     26.8      28.2          NR 40
A017:                      45.2         41.3       44.0       56.0    46.2      41.7    36.1     34.0      29.5                          NR 50


Noise Curves Application Tool                                               NR Curves                                                    Rev. V1.5
PNC Curves Results and Data
                          A016: ANU137_A016_SPL_RTA                                                                          =
                                                                                                              PNC Test Value PNC 40
                          A017: ANU137_A017_SPL_RTA                                                                          =
                                                                                                              PNC Test Value PNC 50



                                                                  PNC Curves
              90.0
                                                                                                                                      Limit MiniSPL

                                                                                                                                      Limit M2010
              80.0
                                                                                                                                      PNC 65

              70.0                                                                                                                    PNC 60

                                                                                                                                      PNC 55
              60.0
                                                                                                                                      PNC 50


              50.0                                                                                                                    PNC 45
  SPL in dB




                                                                                                                                      PNC 40

              40.0                                                                                                                    PNC 35

                                                                                                                                      PNC 30
              30.0
                                                                                                                                      PNC 25


              20.0                                                                                                                    PNC 20

                                                                                                                                      PNC 15
                                                             Limit MiniSPL
              10.0                                            Limit M2010                                                             A016:

                                                                                                                                      A017:
               0.0
                31.5 Hz       63 Hz         125 Hz      250 Hz    500 Hz     1 kHz      2 kHz         4 kHz          8 kHz

                                                Octave Band Center Frequency



Data and Computations
                          31.5 Hz     63 Hz    125 Hz    250 Hz   500 Hz   1 kHz     2 kHz      4 kHz     8 kHz         PNC Value        PNC Value

PNC 65                      79         76        73        70       67      64        61         58           58
PNC 60                      76         73        69        66       63      59        56         53           53
PNC 55                      73         70        66        62       59      55        51         48           48
PNC 50                      70         66        62        58       54      50        46         43           43                               50
PNC 45                      67         63        58        54       50      45        41         38           38
PNC 40                      64         59        54        50       45      40        35         33           33               40
PNC 35                      62         55        50        45       40      35        30         28           28
PNC 30                      61         52        46        41       35      30        25         23           23
PNC 25                      60         49        43        37       31      25        20         18           18
PNC 20                      59         46        39        32       26      20        15         13           13
PNC 15                      58         43        35        28       21      15        10         8             8
A016:                      41.2       35.7      35.4       43.5    32.2    27.1      26.4       26.8          28.2           PNC 40
A017:                      45.2       41.3      44.0       56.0    46.2    41.7      36.1       34.0          29.5                         PNC 50




Noise Curves Application Tool                                       PNC Curves                                                         Rev. V1.5
    RC Curves Results and Data
                            A016: ANU137_A016_SPL_RTA                                                  RC Value = RC 29 (H)



                                                             RC Noise Rating
               80.0
                                                                                                                               Limit MiniSPL


               70.0                                                                                                            Limit M2010


                                                                                                                               RC 50
               60.0
                                                                                                                               RC 45

               50.0                                                                                                            RC 40


                                                                                                                               RC 35
   SPL in dB




               40.0
                                                                                                                               RC 30

               30.0                                                                                                            RC 25


                                                                                                                               A016:
               20.0
                                                                                                                               Ref Curve
                                                           Limit MiniSPL
               10.0                                        Limit M2010                                                         Rumble Limit


                                                                                                                               Hissy Limit
                0.0
                 31.5 Hz     63 Hz       125 Hz     250 Hz        500 Hz        1 kHz        2 kHz     4 kHz      8 kHz


                                                Octave Band Center Frequency




   Data and Computations
                            31.5 Hz     63 Hz     125 Hz   250 Hz     500 Hz       1 kHz       2 kHz   4 kHz     8 kHz

   RC 50                      75         70        65        60            55           50      45       40        35
   RC 45                      70         65        60        55            50           45      40       35        30
   RC 40                      65         60        55        50            45           40      35       30        25
   RC 35                      60         55        50        45            40           35      30       25        20
   RC 30                      55         50        45        40            35           30      25       20        15
   RC 25                      50         45        40        35            30           25      20       15        10
   A016:                     41.2       35.7       35.4      43.5      32.2         27.1       26.4     26.8      28.2
   Ref Curve                  54         49        44        39            34       29          24       19        14          Evaluations
   Rumble Limit               59         54        49        44            39                                                    Neutral (N)
   Hissy Limit                                                                          32      27       22        17              Violations
                                                                                                               Background Noise = Hissy (H)

                  SIL = (          32    +         27         +            26    ) / 3 =        29
                       SIL = Speech Interference Level



Noise Curves Application Tool                                        RC Curves                                                      Rev. V1.5
A016:                         LEQ :   43.7   37.6   35.7   38.4
ANU137_A016_SPL_RTA           SPL :   41.2   35.7   35.4   43.5
A017:                         LEQ :   52.4   46.9   44.0   56.0
ANU137_A017_SPL_RTA           SPL :   45.2   41.3   44.0   56.0




Noise Floor of measurement equipment
MiniSPL + AL1                         37.8   38.0   36.6   32.0
Sensitivity: 20mV / Pa
Range: 20 .. 100 dB

M2010 + AL1                           17.0   17.7   18.1   18.4
Sensitivity: 32mV / Pa typ.
Range: 20 .. 100 dB
31.6   27.4   26.2   27.1   28.3
32.2   27.1   26.4   26.8   28.2
47.0   41.3   36.7   34.4   29.6
46.2   41.7   36.1   34.0   29.5




27.2   24.7   25.6   27.4   29.8




18.8   18.6   18.8   19.4   21.6

				
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posted:1/31/2013
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