Bruel and Kjaer 4220 Sound Level Calibrator

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Home > Test & Measurement > Meters > Sound Level Meters

Bruel and Kjaer 4220 Sound Level Calibrator by US Instrument

Item Condition: Used
Brand: Bruel & Kjaer
Model#: 4220
Location:
Price:

US Instrument
800-870-0787

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Product Description

Bruel and Kjaer 4220 Sound Level Calibrator

Rent me for $100 a month

Designed for accurate everyday calibration of sound level meters using .5 in. and 1 inch microphones. Pocket sized sound source designed for for accurate, everyday field calibration of sound level meters using .5 in. and 1 inch microphones.

Features

Sound pressure level 124dB

Calibration accuracy Â± 0.2dB

Frequency 250Hz Â± 1%

Distortion < 3% at 250 Hz

Power Source: Internal. 9 Volt battery

The 4220 is designed for the calibration of 1'' and 1/2'' diameter microphones. An adaptor is placed over the opening for use with 1/2'' microphones and is removed when 1'' microphones are to be calibrated. The sound pressure level produced by the 4220 is 124 dB . However, when calibrating a microphone which is to be used for free field measurements, a small correction is necessary to compensate for the difference between free field response at 0Â° incidence and the pressure response. The correction is -0,4 dB for 1'' free field microphones and -0,2 dB for 1/2" free field microphones. This makes the effective calibration levels 123.6 dB and 123,8 dB respectively. No correction is required when calibrating pressure response microphones.
Adaptors are available so that the B & K 1/4" and 1/8" microphones can be calibrated using the 4220. For 1/4" microphones, the adaptor DB 0310 is required. For 1/8" microphones both adaptors DB 0310 and DB 0352 are required. In each case the extra adaptors fit inside the 1/2" microphone adaptor supplied (DB 0311).

Calibration Procedure

Select and fit the requisite adaptor to the 4220

Place the 4220 snugly over the microphone

Press the button on the 4220. A hold circuit maintains the signal for up to one minute (with a new battery) after the push button is released.

Adjust the sensitivity of measuring equipment to read the appropriate value (see Table)

Table: Indication required from measuring equipment for various microphone types

Pressure Response

124 dB

Free Field Response

1 inch microphones: 123,6 dB
1/2 inch microphones: 123,8 dB

Replacement of Battery

If the calibration signal lasts only a few seconds after the push-button on the 4220 has been released the the battery needs replacing. The battery is a 9 V type IEC 6F 22 or NEDA 1604.