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Using the Beran 801M to Calibrate Sound Measuring Equipment
The Beran 475/485/801M Dynamic Response Calibrator
System is capable of calibrating Measurement Microphones,
Preamplifiers and Sound Level Meters.
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Microphone
Open Circuit Sensitivity |
Microphone
Free Field Response |
| Insert
Voltage Technique |
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| One of the key components of the Beran system
is its use of a Frequency Response Analyser (FRA). The
FRA uses the Single Sine Correlation technique, which
makes it ideal for the calibration of microphones, by
removing unwanted harmonics and noise present in the measurement
system. The technique involves the use of very narrow
band-pass digital filters, which are locked to the excitation
test frequency used to drive the microphone actuator.
The phase response of a microphone and pre-amplifier may
also be measured.
The Beran 801M Microphone Conditioning unit is remotely
controlled by the Beran 475/485 analyser and contains
all of the necessary interface circuitry to perform
Pressure, Insert Voltage and Electrostatic Actuator
calibration.
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