NTi Audio XL2 Sound Level Meter - Manual (Page 135)

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Calibration
7. Calibration
The XL2 Audio and Acoustic Analyzer meets or exceeds the
specifications listed in the chapter Technical Data.
Instrument Calibration
In order to maintain the high accuracy, annual calibration of
the XL2 Analyzer and the measurement microphone is recom-
mended. The calibration service verifies the complete product
specifications, differences to the last calibration and measures
the frequency response of the measurement microphone. To
enquire about calibration service, follow the RMA guide lines
at www.nti-audio.com.
Microphone Sensitivity
NTi Audio’s ASD measurement microphones and the micro-
phone pre-amplifier MA220 include an electronic data sheet.
The Automated Sensor Detection (ASD) of the XL2 recognizes
the sensitivity and calibration data of the connected micro-
phone. The electronic data sheet, including the microphone
sensitivity, is displayed in the menu Calibrte.
The sound level meter and calibrator should be exposed to the
same environmental conditions prior any calibration for the fol-
lowing recommended periods:
10 minutes after a temperature change of 10°C. •
15 seconds after the static air pressure has changed by •
5 kPa.
10 minutes after a humidity change of 30% without conden-
•
sation.
The described calibration method and correction data apply for
the following environmental conditions:
Temperature: -10 °C to +50 °C •
Static air pressure: 65 kPa to 108 kPa •
Humidity: 25 % to 90 % r.H. •
without dew from -10 °C to +39 °C