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measurement should be used. The With calibration factor calibration procedure
allows the user to manually adjust the calibration factor.
4.2.1 Calibration by measurement
calibration is complete, the new calibration factor is updated and the user can press
the <Enter> or <ESC> key to save or ignore the result. This menu also displays the
calibration history. Entries with the M symbol at the end indicate that the data set has
been calibrated using the By Measurement procedure.
4.2.2 Calibration with calibration factor
indicates that the data set was calibrated with the method With calibration factor.
4.2.3 Conversion of calibration factor and sensitivity
The sensitivity can be calculated with the following formulas. The calibration factor can
also be calculated from the sensitivity and entered directly into the sound pressure
meter.
Here is:
is the calibration factor in decibels (dB);
Cal.F
the sensitivity of the microphone in mV/Pa;
Sens
the calibration factor in decibels (dB). This value is the calibration result with
Offset
the method By measurement with a signal of 50 mV. This offset is the device-specific
deviation, which is different for each sound pressure measuring instrument.
4.2.4 Calibration by measurement
Calibration by measurement is the recommended calibration procedure using a sound
calibrator. KERN can supply sound calibrators of class 1 and 2 according to the
standards GB/T 15173-2010 and IEC60942: 2003.
Proceed as follows for calibration by measurement:
Insert the microphone into the cavity of the calibrator as far as it will go; the
1.
microphone must be tight.
20
Select the By Measure option and press the <Enter> button to
enter this menu. See Chapter 7 for more details on the specified
calibrator and its corresponding adjustment values.
The calibration level can be adjusted between 0 dB and 199.9 dB.
Press the arrow keys <◄>, <►> and <▲>, <▼> to change the
calibration level and the <Start> key to start the calibration. When
Select the With calibration factor option and press the <Enter>
button to enter the menu.
Users can manually adjust the calibration factor. Use the arrow keys
<◄> , <►> to select the factor number, use the arrow keys <▲> ,
<▼> to select the value, save it with the <Enter> key and return to
the last menu with the <ESC> key. An entry with the end F
Cal.F = 20 * log (Sens / 50) + offset
Sens = 50 * 10
((calibration factor offset) / 20)
SW-BA-e-2020
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