Check The Calibration; How To Perform A Calibration Check - B&K 2245 User Manual

CHECK THE CALIBRATION

It is a best practice to check the accuracy of your instrument before and after measuring by performing a calibration
check. A calibration check is not a calibration. Calibration includes an adjustment of the instrument's sensitivity. A cal-
ibration check compares the current sensitivity of the instrument with the sensitivity from its initial calibration, checking
that it has not changed too much.
When you place a sound calibrator on the microphone, the instrument detects the tone and automatically checks the
deviation of the sensitivity of the instrument from its initial calibration.

How to Perform a Calibration Check

You will need:
The instrument
l
A sound calibrator such as Type 4231
l
A sound calibrator generates a known sound level, against which the measured level can be checked. Type 4231
generates a tone at 1 kHz with levels at 94 dB or 114 dB
✐ Note: Be sure to add the calibrator's serial number in the calibration settings of the instrument. Go to: Menu
> System settings > Advanced settings > Calibration > Type 4231 no.
Procedure:
1. Turn on the instrument.
✐ Note: Ensure that the instrument is not measuring and that the menu is not open.
2. Gently seat the calibrator on the microphone.
Check the Calibration:
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How to Perform a Calibration Check