
Hand-held Analyzer Type 2250 –
Instruction Manual
26
4.6.6 Free-field Frequency Responses for Diffuse-field Calibrated Instruments
According to IEC 60651 and IEC 60804, the free-field frequency response in the reference direction for
diffuse-field calibrated instruments must be specified. This response is given in the “Electrical Re-
sponse” column of Table A.7.
4.7 Directional Response
This section gives directional responses for plane progressive sinusoidal sound waves normalised to the
response in the reference direction.
BE171211.book Page 26 Thursday, May 27, 2004 1:01 PM
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