Biological Calibration Checks In Less Than 30 Seconds

X-check (cross-check) is a digital calibration verification tool designed to replace manual calibrations checks and is available as an add-on for all KUDUwave™ devices.
It enables accurate calibration verification (within 5dB) to objectively measure and ensure the precision of your results.

Audiometer calibration should be performed annually. In some standards such as the South African SANS 10154-1.3 for occupational health, quarterly calibration intervals are required for portable audiometers. This also applies to any audiometers which are moved from one location to another. That being said, regular calibrations are a requirement for every audiometric testing scenario.

But what happens between calibration intervals?

Regular calibration is mandatory, but your audiometer, whether static or portable can go out of calibration at any point during the year. A bump or a damaged cable could be the difference between correct and incorrect test results.

Even the slightest error could alter your treatment path.

The effect could be exaggerated in a high volume testing scenario such as occupational health.

So, how do you ensure that your results are always on point?


That is where biological calibration checks come in.

Biological calibration checks are a requirement of most standards and best practice guidelines.
These checks are intended to ensure that your audiometer is performing as expected between calibration intervals. It should be done daily, prior to performing any tests. 

But, how many clinicians or occupational health practitioners actually do this standard check?


Why biological checks aren't good enough

Biological tests are done by testing the hearing of a subject with known hearing values, often the clinician or another staff member. If the results match, the device should still be calibrated. Simple. Or is it?

Biological checks are subjective in nature, and can be affected by certain factors such as; the health of the subject or the subject's recent exposure to noise. Both of which can affect thresholds. A common cold can affect your hearing levels, even before you are acutely aware that you are ill.

They can also be a pain and take up valuable time to perform which means that some clinicians tend to skip them all together.

Calibration checks are allowed an effective 20dB range of accuracy (10dB either direction), coupled with our own biological variations this makes them inaccurate.

When even a 10dB variation in test results could make all the difference should we really rely solely on this form of verification?


That is why we developed X-check.

X-check replaces biological calibration checks with a more reliable and accurate digital calibration verification that takes just 30 seconds. This is a powerful tool that is used to cross reference calibration values and actual outputs on the fly and gives you the power to act quickly if there are any identified problems.

You will not only save time but also ensure that you stay compliant with the relevant standards, follow best practice and produce accurate test results between calibrations.


Step 1:

Launch your KUDUwave software and click on the X-check icon in the bottom left-hand corner of your home screen.

The X-check start page will appear:

xcheck home screen

Step 2:

Follow the on-screen instructions to connect your sound tubes to the X-check ports and Click Start.

Make sure that the right sound tube is plugged into the right ear-cup, and the left sound tube into the left ear-cup.


Step 3:

Your KUDUwave will now do all the work for you.

Sit back and watch the little bars sprint to the end. If all is well, X-check will take about 30 seconds to complete. Once complete, a message will indicate if your calibration verification has passed or not.

X-check calibration verification

Final Step:

Click Finish to exit X-check and carry on testing patients to your heart's content.

If your test fails, don’t worry, there are some simple checks you can do before trying again. These are covered under X-Check Failed.

What is in the X-Check Report

Curious to know what happened during the X-Check test?

No problem. To get a comprehensive technical report of your X-Check results, click on the “Detail view” button to display the report. 

calibration check report

Technical Details

The report shows all the tested frequencies as well as the Amplitude Error of each.

The Amplitude Error is the discrepancy or difference between the calibrated level of the KUDUwave's air conduction output and the actual air conduction output measured by X-check. Ideally all of the error values should be zero. In the real world these values will include both X-check measurement error and KUDUwave calibration error. X-check measurement error is affected by factors like ambient temperature and atmospheric pressure. X-check uses the following specifications for the pass criteria of the amplitude errors of the pure tones.

+/- 5.0 dB difference for frequencies between 125 Hz and 4 kHz

+/- 6.2 dB difference for frequencies between 4 kHz and 8 kHz

+/- 6.5 dB difference for frequencies between 8 kHz and 16 kHz

Please note: These standards are not a replacement of the need for audiometer calibrations as per local standards.


This will generate and open a PDF, like the one shown here. Once the PDF is generated you can print it on your connected printer or save it. The PDF report is also automatically saved in the eMoyoDotNet/Pdf folder on your computer.

print your report

X-check (Cross Check) verifies the calibration of your KUDUwave digitally. Like biological checks, X-check does not replace the need for regular calibrations as per the need for regular calibrations.

X-check is a new feature that comes standard with all  KUDUwave™ Prime, KUDUwave™ Plus and KUDUwave™ Pro devices made after March 2018. The great thing about KUDUwave Audiometers is that they are all up-gradable.

If your KUDUwave™ is not equipped with X-check a message will indicate that you should contact us to make arrangements.

Upgrades are simple and will also include the cost of calibration.