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Microphone Cartridge Calibration Values

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

Norsonic

1220

113,85dB

1221

113,85dB

1223

113,85dB

1225

113,85dB

1226

113,85dB

1227

113,85dB

1228

113,85dB

1230

114,00dB

1233

114,00dB

1234

114,00dB

1235

114,00dB

1236

114,00dB

1237

114,00dB

1245

114,00dB

1246

114,00dB

Microtech

MK102

113,70dB

MK103

113,70dB

MK202

113,85dB

MK221

113,85dB

MK222

113,85dB

MK231

114,00dB

MK250

113,85dB

G.R.A.S.

40AC

113,85dB

40AD

114,00dB

40AE

113,85dB

Manufacturer

Microphone Type

Calibration Level

G.R.A.S. cont...

40AF

113,85dB

40AG

114,00dB

40AI

114,00dB

40AN

113,85dB

40AP

114,00dB

40AQ

114,00dB

40AR

114,00dB

40BD

114,00dB

40BE

114,00dB

40BF

114,00dB

40BP

114,00dB

Rion

UC-53

113,85dB

B&K

4144

114,00dB

4145

113,70dB

4179

113,70dB

4133

113,85dB

4134

114,00dB

4147

114,00dB

4149

113,85dB

4155

113,85dB

4165

113,85dB

4166

114,00dB

4180

113,94dB

4188

114,84dB

4936

114,84dB

without protection grid

Содержание nor1251

Страница 1: ... class 1 sound calibrator nor1251 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 ...

Страница 2: ......

Страница 3: ...user documentation nor1251 class 1 sound calibrator ...

Страница 4: ...on and or the instrumentation described herein Furthermore Norsonic AS assumes no responsibility for any infringement of the intellectual property rights of third parties wherever applicable which would result from such use Norsonic AS reserves the right to amend any of the information given in this manual in order to take account of new developments If you wish to communicate with us please feel ...

Страница 5: ...eady know The manual has been divided into two parts one dealing with the use of the calibrator while the other discusses the operating principles and presents the technical specifications Depending on your requirements and your familiarisation with technical acoustics as such you may find that you use some parts of this manual often and others not at all Our main objective with this manual was to...

Страница 6: ...ed to produce a known sound pressure level when used correctly together with the measuring microphone of the sound measuring instrument All sound measuring instruments of the quality levels con sidered here feature some way of sensitivity adjustment Some have a small potentiometer that can be adjusted with a screw driver while others do it in software If the level indicated by your sound measuring...

Страница 7: ...perience that national and or international stand ards may impose restrictions on which instrument types are considered usable for a given measurement task Our problems do not end with the uncertainties of the sound measuring instruments Even sound calibrators are in fected with level uncertainties Hence these have also been divided into types called classes depending on their level ac curacy and ...

Страница 8: ...1 is easy and uncompli cated To calibrate with the Nor 1251 do as follows 1 Insert the microphone to be calibrated in the coupler of the calibrator Use a suitable adaptor if necessary 2 If the background noise is high watch the noise level and press the ON button to switch on the calibration signal Verify that the calibration signal is at least 20dB above the background noise floor 3 Adjust the se...

Страница 9: ...tself off after ap proximately five minutes Miniature loudspeaker generat ing the sound pressure level inside the coupler Silicone microphone monitoring the sound pressure level inside the coupler One side of the mi crophone diaphragm is ex posed to the sound pressure inside the coupler while the rear side of the diaphragm is located in a separate vented cavity to prevent pick up of extaneous nois...

Страница 10: ... by pulling it straight backwards 2 Pull out the battery from the battery compartment and unclip the battery connector 3 Replace the battery with a fully charged battery of the type IEC type 6LR61 nine volt alkaline 4 Alternatively a nine volt lithium battery of identical physical dimensions may be used 5 Install the battery and the rear cover See also the Fig on the previous page for details Cons...

Страница 11: ...microphone volume of 250 mm which corresponds to most 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 The typical sensitivity for the level change is 0 0003 dB mm3 at 1000 Hz Hence if a microphone with an effective fr...

Страница 12: ...tem also compensates for drift in the loudspeaker The acoustic coupler is vented to the inside of the calibrator which in turn is vented to the outside for equalization to the atmospheric pressure A separate channel vents the rear side of the reference transducer to the outside of the calibrator A Light Emitting Diode LED is illuminated whenever the level control is in balance When no microphone i...

Страница 13: ...hown together with the headroom for uncertainty of measurement Nor 1251 is checked at three tempera tures 10 C 23 C and 45 C to en sure that the output level is well within the requirements set by IEC 60942 and ANSI S 1 40 over the specified tempera ture range Calibrator sound pressure level change dB as a function of temperature C 0 4dB 0dB 0 4dB 0 10 20 30 40 50 C 10 23 C 0 4dB 0dB 0 4dB Calibra...

Страница 14: ...crophone size 1 Adaptor Nor 1443 included and Adaptor Nor 1444 available separately according to IEC61094 4 Harmonic distortion Max 1 Controls Power on push button Automatic shut off CE classification EMC EN 61000 6 1 EN 61000 6 3 Safety EN 61010 1 1993 for portable equipment pollution category 2 AMBIENT REQUIREMENTS FOR SPECIFIED OPERATION Temperature range 10 to 50 C Class 1 Ambient pressure ran...

Страница 15: ...235 114 00dB 1236 114 00dB 1237 114 00dB 1245 114 00dB 1246 114 00dB Microtech MK102 113 70dB MK103 113 70dB MK202 113 85dB MK221 113 85dB MK222 113 85dB MK231 114 00dB MK250 113 85dB G R A S 40AC 113 85dB 40AD 114 00dB 40AE 113 85dB Manufacturer Microphone Type Calibration Level G R A S cont 40AF 113 85dB 40AG 114 00dB 40AI 114 00dB 40AN 113 85dB 40AP 114 00dB 40AQ 114 00dB 40AR 114 00dB 40BD 114...

Страница 16: ... 6 3 following the provisions of the 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 This Declaration of Conformity does...

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