Correction based on C0
Configuration Industry
Provided values for C0 are available for the time periods Day, Evening, and Night these can be directly entered on dialog Configuration, tab „Industry“.
- Open the dialog Configuration|Industry.
- On the tab, select for under „Meteorology“ the item „Cmet, constant C0“ instead of „none“.
- Enter the values 2, 1 and 0 dB for D/E/N, respective and close the dialog.
Dialog Configuration|Industry: Input of constant C0-values
Example
- Enter a point source with A-weighted sound power level of PWL = 100 dB(A) at (x,y)=(100,100) and two receivers at (x1,y1)=(180,100) and (x2,y2)=(200,100).
- Choose on dialog Configuration, tab „Performance Parameters“ (Calculation menu) the performance parameters 1:Ld, 2:Le and 3:Ln and deactivate the check box in front of the column "Name".
- Name both receiver by RCVR 1 and RCVR 2 in the table Point Source (Tables menu).
- Select from the Calculation menu the command Protocol and activate the option "Write Protocol".
- Start the calculation by clicking the pocket calculator symbol in the tool bar.
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Result level Ld|Le|Ln for the receiver at a distance of 80 m |
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Result level Ld|Le|Ln for the receiver at a distance of 100 m |
In this case, no meteorological correction applies at 80 m distance, but at 100 m distance.
Limit for distance source-receiver:
\(d_p>10(h_s+h_r)=10(4+4)=80m\)
Thus, for the receiver at 80 m distance no Cmet-correction results. For the receiver at 100 m distance the Cmet-corrections result in:
\(C_{met,d} = 2[1-0.8]=0.4dB\)
\(C_{met,e} = 1-0.8=0.2dB\)
\(C_{met,n} = 0dB\)
- Open the protocol (Calculation menu|Protocol) and set the period to „all“.
- Click the buttons „Print“ and „Preview“.
The protocol for receivers 1 and 2 consists of two pages. For receiver 1 the correction is Cmet=0 dB (for Ld, Le and Ln):
For receiver 2, however, the Cmet values as listed below result from the calculation:
