iSEMcon SC-1 Calibrator

Single-frequency dual-amplitude, self-contained field calibrator for measurement microphones.


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iSEMcon SC-1 Calibrator

The iSEMcon SC-1 calibrator is a single-frequency dual-amplitude, self-contained field calibrator used to quickly and precisely verify the accuracy and the sensitivity of microphones. The unit generates a 1kHz reference tone at 94 and 110 dB SPL. The SC-1 consists of an amplitude-switchable constant frequency oscillator, a transducer and a microphone coupler. The coupler accepts a large variety of microphones.

iSEMcon SC-1 Calibrator KEY FEATURES

  • Frequency: 1kHz +- 0.2%
  • SPL: 110dB – 94dB switchable
  • Accuracy: +- 0.5dB at 20 Grad Celsius and 1013 mbar
  • Ambient temperature range: 0 – 45 Grad Celsius
  • Temperature drift: < 0.02dB per Grad Celsius
  • Temperature drift frequency: < 0.05Hz per Grad Celsius
  • Storage temperature range: -25 – 55 Grad Celsius (without battery)
  • Humidity: 5 bis 95% relative
  • Power supply: 9V battery or accumulator
  • Housing: Aluminium, PVC
  • Dimensions: Diameter 40mm (1.5 in) / Length 132mm (5.2 in)
  • Weight (without battery): 164g (5.7 oz)
  • Conformity: Class 2

iSEMcon SC-1 Calibrator

Whats is included

  • SC-1 Calibrator
  • 1/2″ Calibrator Adapter
  • 1/4″ Calibrator Adapter
  • 9v Battery
  • Carrying Pouch
  • Calibration Certificate.



The internal battery check circuitry compares the battery voltage to a reference. If the battery is too low for proper operation the power control LED will be switched off. Sound production is continued without amplitude stabilization.

  1. Place this adapter over the microphone, being sure the microphone fits down inside the adapter and rests on the lower rim. Note: If the calibrator has recently been moved from
    one area to another of substantially differing temperature, it is advisable to wait a minimum of 30 minutes before attempting to calibrate.
  2. Carefully lower calibrator over microphone and adaptor. Be sure calibrator is seated squarely with adapter and microphone or significant errors may result. Caution: Rapid lowering or withdrawal of the calibrator may damage the microphone or the transducer because of the rapid change in pressure on the diaphragms.
  3. The SC-1 uses push-on-off latching switches. Push ON/OFF switch to the depressed position to turn on. Allow up to 3 seconds for it to stabilize. Look at the red inidicator LED. If no light is apparent sound production is without amplitude stabilisation or off. Refer to section on battery replacement.
  4. Select desired amplitude. The “in”-position correspond to 94dB the “out”-position to 110dB. Note:
    1. Background noise must be more than 20dB below calibrator output.
    2. Calibrate at or near full scale deflection of SPL Meter.
  5. Verify sound level meter accuracy by comparing it´s reading with the calibrator´s output. If altitude or temperature corrections are necessary, refer to the following example.
  6. After calibration is complete, slowly remove the calibrator and switch it off.


Operator decisions are needed but simple to determine condition of the battery. If the battery is too low as to affect the calibration, a low battery detector circuit disables the power control lamp. To change the battery, first be sure the calibrator is turned off. Then remove the two screws on the face plate of the calibrator. Remove the face plate exposing the circuitry and the battery. Pull out the weak battery and unsnap the battery clip. Replace with a fresh battery, snap on the clip. Carefully drop the battery in the calibrator housing and replace the face plate so as not to pinch any wires.


The calibrator should be periodically checked with laboratory standards. Please consult local test centre to conduct this procedure.


Shop more iSEMcon Products HERE.

Additional information

Weight 1 kg
Dimensions 20 × 20 × 10 cm

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