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SVANTEK 977W User Manual
10.6.2. Instrument calibration
– Calibration
The
Calibration
sub-list enables the user to
calibrate the sound measurement path. The
user can calibrate with the use of
information of the microphone sensitivity
(
Calibr. by Sensitivity
) or by performing
calibration measurement with the use of
dedicated
sound
calibrator
(
Calibr. by Measurement
).
<ENT>
Calibration by Sensitivity
Calibration by using the
microphone’s
published sensitivity information can be
performed in the following way:
1. Select this type of calibration (highlight
the
Calibr. by Sensitivity
text) from the
Calibration
sub-list and press the
<ENTER>
push-button.
<ENT>
2.
Set the sensitivity of the microphone
taken from its calibration certificate
using the
<Shift>
with
◄ or ► push-
buttons and then press
<ENTER>.
The calibration factor is calculated, after
pressing the
<ENTER>
push-button, in
relation
to
the
nominal
value
of
35.0 mV / Pa. To avoid calculation, the user
should leave the
Calibration
sub-list by
pressing
<ESC>
.
<ENT>
For a microphone sensitivity, higher than 35.0 mV / Pa, the calibration factor
will always be negative. For a microphone sensitivity, lower than 35.0 mV / Pa,
the calibration factor will always be positive.
The lowest available value of the sensitivity that can be introduced is equal to
35.0
µV / Pa (it conforms to the calibration factor equal to 60.0 dB) and the
highest value is equal to 35.0 V / Pa (calibration factor is equal to -60.0 dB).
Unlike the
Calibration
list in the
Function
menu where the new calibration factor
differs more than ±1.1 dB from the factory
one or the last changed by the authorised
service will be rejected, in the
Service
part
every change will be accepted.
<ENT>
To return to the
Calibration
sub-list, the user should press the
<ESC>
push-button.
