Pulsar Nova® sound level meter user manual
Page 22
Take care not to use a twisting motion when pushing the microphone into the calibrator,
as this is likely to cause damage to the preamplifier.
Press the power button on the end of the calibrator. Press the calibrate button in the
Nova® Menu.
The instrument will measure the sound level from the acoustic calibrator to determine if
it is within the required tolerance and levels. The calibration level must be stable to
within ±0.075dB for 5 consecutive seconds for the calibration to be successful.
When the calibration is completed, the Nova® will display the level along with the
correction or adjustment made.
The Nova® is preset with the correction values needed for Pulsar Instruments
microphone capsules, so no manual adjustment is required. The calibration level you
should expect is 93.7dB.
As specified in the International standards, only a Pulsar Instruments calibrator should
be used with the Nova®, as these have the appropriate correction factor for the
difference between the free field and pressure responses of the microphone.
The correction factor specified by another manufacturer may be very different and put
the subsequent measurements out of tolerance. Refer to page 53 for detailed operating
information for the Model 105 Class 1 and Model 106 Class 2 Acoustic Calibrators.
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