CESVA CB004, Руководство пользователя

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CB006 / CB004
User’s manual
13
Make Model Correction factor
Effective checking
level
CESVA C-250 - 0.1 dB 93.9 dB
CESVA C-130 - 0.1 dB 93.9 dB
CESVA P-05 - 0.1 dB 93.9 dB
CESVA P007 - 0.1 dB 93.9 dB
B&K 4134 0 dB 94.0 dB
B&K 4180 0 dB 94.0 dB
EXAMPLE : you have to check an SC310 sound level meter with a C-130
microphone.

First, you must obtain the value of the pressure to free field correction at 1 kHz of the
C-130 microphone
from the user’s manual of the instrument. This is 0.1 dB.

The value of the pressure to free field correction at 1 kHz factor is -0.1 dB.

Effective checking level = level generated by the calibrator + pressure to free field
correction at 1 kHz factor

Effective checking level = 94 + (-0.1 dB) = 93.9 dB.
6) When finishing the test, press the power button (1) again and the indicator will go off
to show that the unit is switched off.
NOTE 1 : The calibrator will automatically switch off after 5 minutes to preserve battery
power.
NOTE 2 : In order for the calibrator to operate as intended, the ambient acoustic noise level
should be no greater than 80 dBA.
NOTE 3 : C
onsult the chapter on checking of the user’s manual of the instrument.
3.2. Permanent-on Mode
For some applications there may be a need to have the calibrator switched on continuously.
To allow for this, the calibrator can be turned on by pressing and holding the power button for
three seconds.
Release the button and the indicator (4) will flash for a short time to show that the unit is in
permanent-on mode, and afterwards will remain constant. Press the power button (1) to
switch off the calibrator.