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Summary of Contents for Norsonic nor1251
- Page 1 user documentation 1251 A battery operated sound cali- brator complying with the IEC 60942 (2003-01) Class 1 producing 114 dB @ 1000 Hz. The sound calibrator shuts off automatically when the micro- phone is removed from the cou- pler. class 1 sound calibrator 1251 _1Ed1R3En...
- Page 3 user documentation 1251 class 1 sound calibrator...
- Page 4 Norsonic AS reserves the right to amend any of the information given in this manual in order to take account of new developments.
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Page 5: Finding The Information You Need
Finding the Information You Need hank you for choosing Norsonic! The Sound Calibrator Nor- 1251 has been designed to provide you with many years of safe, reliable operation. Your approach to the Nor-1251 documentation depends on what you want to do and how much you already know. - Page 6 What Is a Calibrator for? hen you are going to make a measurement of any One may therefore say that a calibrator is just as much a kind, you need to ascertain that what you measure is device for verification of proper operation as it is a device for indicated correctly by your measuring device.
- Page 7 Accuracy and Tolerances You may experience that national and/or international stand- ards may impose restrictions on which instrument types are Above, we talked about the need to measure correctly. As we considered usable for a given measurement task. shall see, this is strictly speaking not absolutely true, since a Our “problems”...
- Page 8 For example; when using the Norsonic microphone car- minutes. The on-time will be reduced as the battery-voltage de- tridge 1225, at 1000 Hz the sensitivity of your sound meas- creases.
- Page 9 Vital parts of the Sound Calibrator Nor-1251… Adaptor to facilitate the calibration of half-inch cartridges in addition to full- inch is included, while adaptors for other sizes must be ordered separately Miniature loudspeaker generat- ing the sound pressure level inside the coupler. A green LED illuminates when the sound pressure level inside the coupler cavity is correct.
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Page 10: Battery Replacement
2. Pull out the battery from the battery compartment and unclip credited acoustic calibration laboratory or the Norsonic factory. the battery connector The calibration should be carried out at room temperature and 3. - Page 11 250 mm³, which corresponds to most ½” measuring microphones with protecting grid mounted like the Norsonic types 1220, 1225 and 1230. If the actual microphone has a volume deviating from this reference vol- ume, the accuracy may be improved by applying a volume correction.
- Page 12 Operating principles and Characteristics The Sound Calibrator Nor-1251 principles of operation is shown in • The acoustic coupler is vented to the inside of the calibrator, the below block diagram and is as follows: which in turn is vented to the outside for equalization to the atmospheric pressure.
- Page 13 Influence of Ambient Conditions Calibrator sound pressure level change [dB] as a function of temperature [°C] 23°C The applied operating principles and the 0.4dB careful selection of critical components ensures that the Sound Calibrator Nor- 1251 exhibits a low sensitivity to varia- tions in the ambient conditions.
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Page 14: Specifications
Specifications OUTPUT SIGNAL Sound pressure level: 114dB (re. 20µPa) @ 1000Hz SPL accuracy at reference conditions: ±0.2dB Frequency accuracy: ±0.2%. Accuracy: Complies with IEC60942 (2003-01) Class 1 and ANSI S 1.40. Typical change in SPL per year: <0.01dB/year REFERENCE CONDITIONS Temperature: 23°C Ambient pressure: 101.325kPa Humidity: 50% RH... - Page 15 Microphone cartridges should be calibrated in accordance with their size and working principle. The table lists some commonly used microphone cartridges and their corresponding calibration values applicable with the protection grid mounted. Manufacturer Microphone Type Calibration Level Manufacturer Microphone Type Calibration Level Norsonic 1220 113,85dB G.R.A.S. cont... 40AF 113,85dB 1221 113,85dB...
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Page 16: Declaration Of Conformity
LVD- and EMC-Directive. This product has been manufactured in compliance with the provisions of the relevant internal Norsonic production stand- ards. All our products are tested individually before they leave the factory. Calibrated equipment—traceable to national and international standards—has been used to carry out these tests.
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