AWA6021A Class 1 Sound Calibrator

The AWA6021A is a compact Class 1 acoustic sound calibrator designed for field calibration and verification of sound level meters, noise dosimeters, measurement microphones and other acoustic measuring instruments.

It generates selectable 94 dB and 114 dB sound pressure levels at 1 kHz, allowing professional users to verify instrument sensitivity before and after noise measurements.

Automatic atmospheric-pressure compensation, fast stabilisation and simple push-button operation make the AWA6021A ideal for environmental noise surveys, occupational hygiene, acoustic testing and other applications requiring Class 1 calibration performance.

Key Features

• IEC 60942:2017 Class 1 sound calibrator
• Selectable 94 dB and 114 dB output levels
• 1,000 Hz calibration frequency
• Sound pressure level accuracy: ±0.25 dB
• Frequency accuracy: ±0.7%
• Automatic atmospheric-pressure compensation
• Stabilisation time of less than 15 seconds
• Automatic shutdown after microphone removal
• Suitable for standard 1/2" measurement microphones
• Supports 1" microphones by removing the adaptor
• Optional adaptor available for 1/4" microphones
• Compact and lightweight design
• Powered by standard AA batteries

94 dB & 114 dB Calibration

The AWA6021A provides two selectable calibration levels:

The calibrator starts at 94 dB. The 94/114 control allows the output to be switched to 114 dB when required.

Class 1 Calibration

The AWA6021A complies with IEC 60942:2017 Class 1, making it the recommended choice where the measurement system or application requires high-accuracy acoustic calibration.

Typical applications include:

• Class 1 sound level meters
• Class 2 sound level meters
• Environmental noise measurement
• Occupational noise assessment
• Acoustic consultancy
• Laboratory acoustic measurement
• Machinery noise measurement
• Building acoustics
• Noise monitoring systems

Microphone Compatibility

The standard adaptor is suitable for 1/2" measurement microphones, commonly used with professional sound level meters.

The calibrator can also be used with:

• 1" microphones – by removing the standard adaptor
• 1/4" microphones – using the optional AWA8532 adaptor

Free-Field Microphone Correction

When calibrating a free-field microphone, a small correction may be required depending on the microphone type.

For a typical 1/2" free-field microphone, the manual specifies a -0.2 dB correction at 1 kHz. Therefore, when the calibrator is producing 94.0 dB, the connected sound level meter would typically display approximately 93.8 dB.

Always follow the correction specified for the particular microphone being calibrated.

Simple Field Operation

1. Switch the AWA6021A on.
2. Allow the output to stabilise.
3. Carefully place the calibrator over the measurement microphone.
4. Wait until the indicator confirms stable output.
5. Perform or verify the calibration on the connected measuring instrument.
6. Select 114 dB where a higher calibration level is required.
7. Remove the calibrator after completing the calibration.

When the microphone is removed and the calibrator cavity remains open, the AWA6021A automatically shuts down after approximately five seconds.

Technical Specifications

Typical Applications

• Field calibration of sound level meters
• Noise dosimeter calibration
• Environmental noise surveys
• Occupational hygiene
• Workplace noise measurement
• Machinery and equipment noise
• Acoustic consultancy
• Building acoustics
• Laboratory acoustic measurement
• Measurement microphone sensitivity verification

Calibration & Verification

For measurement work requiring traceability, the sound calibrator itself should also be periodically calibrated.

Aihua recommends periodic metrological calibration — typically annually — to maintain sound pressure level accuracy.

Help Me Choose

AWA6021A vs AWA6022A

Which One Should I Choose?

Choose the AWA6021A when:

• Your sound level meter is Class 1
• Your procedure specifies a Class 1 calibrator
• You want the highest calibration accuracy
• The calibrator will be used across both Class 1 and Class 2 instruments

Choose the AWA6022A when:

• You are primarily calibrating Class 2 instruments
• Class 1 calibration is not required
• Cost is a priority

If you are unsure, choosing the AWA6021A Class 1 calibrator provides the greater flexibility because it can be used with both Class 1 and Class 2 measurement systems.

Help Me Choose

Sound Level Meters

The AWA5636 is the best starting point where Class 2 accuracy is suitable.

Step up to the AWA5662 when Class 1 accuracy is required while keeping the instrument straightforward and cost-effective.

Choose the AWA6228+ where greater configuration flexibility or advanced functions such as FFT, reverberation, detailed frequency analysis or GPS are required.

The AWA6292 is intended for more specialised acoustic applications including advanced frequency analysis, reverberation and STI measurement.

Specialist Instruments

Not sure which model you need? Send us your application, required measurement parameters or applicable standard and our applications team can recommend the most suitable instrument and configuration.

Downloads

Downloads

Download product manuals and operating instructions below.