When you perform calibration of microphones or sound level meters made by Ono Sokki with the SC-2500 Sound Calibrator, please calibrate so that the displaying value of the display device that microphone is connected or of the sound level meter matches the following calibration value.
When you use the value described in the test certificate after SC-2500 calibration, add the correction value to the described value.
Calibration procedure of microphone or sound level meter using SC-2500
1. Check that the power of the calibrator is turned OFF, and gently insert the microphone or sound level meter gently all the way in.
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2. Turn the power of the calibrator ON, and check the displayed value after a waiting a few seconds.
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3. Check the difference between the displayed value and the value in the following table. Adjust the value if necessary.
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4. After the check, turn the power of the calibrator OFF, and gently pull out the calibrator.
■ Calibration value of Sound field type microphone(with protection grid)
| Microphone | Model name | Conditions | Calibration value (dB) | Correction amount (dB) |
|---|---|---|---|---|
| Current model | MI-1280 | With protection grid | 113.8 | -0.2 |
| MI-1271 | With protection grid | 113.8 | -0.2 | |
| MI-1235 | With protection grid | 113.9 | -0.1 | |
| MI-1433 | With protection grid | 114.0 | 0.0 | |
| MI-1531* | With protection grid | 114.1 | 0.1 |
Values when the adapter SC-0313 is installed to the SC-2500.
| Microphone | Model name | Conditions | Calibration value (dB) | Correction amount (dB) |
|---|---|---|---|---|
| Previous model (discontinued) | MI-1281 | With protection grid | 113.8 | -0.2 |
| MI-1211 | With protection grid | 113.8 | -0.2 | |
| MI-1233 | With protection grid | 113.8 | -0.2 | |
| MI-1234 | With protection grid | 113.8 | -0.2 | |
| MI-1431 | With protection grid | 114.0 | 0.0 | |
| MI-1432 | With protection grid | 114.0 | 0.0 |
■ Sound Level Meter and Calibration value
| Sound Level Meter | Model name | Microphone used | Calibration value (dB) | Correction amount (dB) |
|---|---|---|---|---|
| Current model | LA-4441 | (MI-1235) | 113.9 | -0.1 |
| LA-1441 | (MI-1433) | 113.9 | -0.2 | |
| LA-1411 | (MI-1433) | 113.9 | -0.1 | |
| LA-7500 | (MI-1271) | 113.9 | -0.1 | |
| LA-7200 | (MI-1471) | 113.9 | -0.1 |
| Sound Level Meter | Model name | Microphone used | Calibration value (dB) | Correction amount (dB) |
|---|---|---|---|---|
| Previous model (discontinued) | LA-4440 | (MI-1234) | 113.9 | -0.1 |
| LA-1440 | (MI-1432) | 114.0 | 0.0 | |
| LA-1410 | (MI-1234) | 113.9 | -0.1 | |
| LA-3570 | (MI-1211) | 113.9 | -0.1 | |
| LA-3560 | (MI-1235) | 113.9 | -0.1 | |
| LA-3260 | (MI-1433) | 113.9 | -0.1 |
Revised:2017.11.27
