SC-3120 has been discontinued. Click here for related current products

製品写真(SC-3120 音響校正器)


The SC-3120 Sound Calibrator is a precise standard sound source of piston-phone type which accurately calibrates a sound level meter. It drives the piston in the cylinder in reciprocating motion to generate sine-wave sound having a fixed sound pressure level.

The SC-3120 is applicable to IEC 60942:2003 Class 1/C (JIS C1515:2004 Class 1/C)  and calibrates a sound level meter with high accuracy and stability.

It is used for calibration of Class 1 or Class 2 sound level meter and sound measurement instruments including microphone which is used for sound power level measurement.



  • Applicable to IEC 60942:2003 Class 1/C (JIS C1515:2004 Class 1/C). It can be used for calibration of Class 1 or Class 2 sound level meter.
  • Generating high sound pressure at 114 dB decreases the affection by back ground noise.
  • It can be used for calibration of 1/2-inch or 1/4-inch microphone by Ono Sokki. (1/4-inch microphone requires adapter which is provided with the MI-3140 preamplifier as a standard accessory.)

Overview specification

Applicable standard IEC 60942:2003 Class 1/C
JIS C 1515:2004 Class 1/C
Method Piston-phone
Applicable microphone 1/2-inch microphone (MI-1211/1233/1234/1431/1432)
1/4-inch microphone (MI-1531*)

* The adapter which is provided as standard with the MI-3140 preamplifier for MI-1531 is required in use.

Nominal sound pressure level 114 dB re. 20 μPa
Generated sound pressure level 114 dB ± 0.4 dB (at 23 °C/50 % RH/ atmospheric pressure of 101.325 kPa )
Distortion rate 2.5 % or less
Nominal frequency 250 Hz
Generated frequency 250.0 Hz ± 0.4 %
Output stabilizing time 30 seconds or less after a microphone is inserted.
Operation mode Automatic stop mode (approx. one minute) or continuous mode
Operating temperature range -10 to +50 °C
Storage temperature range -20 to +70 °C (except for batteries)
Operating humidity range 25 to 90 % RH (with no condensation)
Storage humidity range 10 to 90 % RH (except for batteries)
Atmospheric pressure range 65 to 108 kPa
Power requirement Type AA dry cell battery (R6P or LR6) x 3 pcs.
Battery life Approx. 2.5 hours (when using R6P type AA dry cell batteries at 25 °C)
Piston life Approx. 80 hours(at 25 °C)
Outer dimensions 60 (W) × 38 (H) × 200 (D) mm
Weight Approx. 600g (not including batteries)
  • Barometer
  • Type AA dry cell battery (R6P) x 3 pcs.
  • Microphone adapter for 1-2-inch microphone (SC-0312)
  • Storage case




Copyright © ONO SOKKI CO.,LTD All Rights Reserved. | Terms of use | Privacy policy