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4.
Set the controls and push buttons as follows:
GAIN CONTROL
OUTPUT SECTION ATTENUATOR
EFFECTIVE AVERAGING TIME
FREQUENCY RESPONSE
INPUT
READ OUT SELECTOR
"Cal."
"x
1 "
"Fast"
"Linear"
As appropriate
"Lin", "AC" or "DC"
5.
Set the INPUT SECTION ATTENUATOR so that 120 dB (for Pistonphone calibration)
or 90 dB (for Sound Level Calibrator calibration) is indicated on the range setting in-
dicators.
6.
Apply the sound source to the microphone. Using the Pistonphone 4220 or the
Sound Level Calibrator 4230 the meter should read* 124 or 94 dB respectively. If it
does not, adjust the SENS. potentiometer beside the input socket that is being used
until the correct deflection is obtained.
Using Internal Reference Voltage
1.
Carry out the preliminary adjustments if necessary (section 3.1 ).
2.
Fit the meter scale appropriate to the sensitivity of the microphone being used (see
Table 3.1 ).
3.
Plug the microphone and associated preamplifier into the appropriate input of the
2010. Any microphone accessories can remain in position.
4.
Set the controls as follows:
GAIN CONTROL
INPUT SECTION ATTENUATOR
OUTPUT SECTION ATTENUATOR
EFFECTIVE AVERAGING TIME
READ OUT SELECTOR
5.
Select push buttons:
FREQUENCY RESPONSE
INPUT
CALIBRATION
"Cal."
"1 00 mV"
"x
1 ,
"Fast"
"Lin.", "AC" or "DC"
"Linear"
As appropriate
"Ref.
50 mV"
6.
From the calibration chart of the microphone in use determine its Open Circuit Sen-
sitivity in mV per Pa**. This must be corrected for the attenuation and capacitive
loading of the preamplifer. (Refer to the microphone and preamplifier instruction
manual).
7.
Adjust the appropriate input SENS. potentiometer until the required sensitivity is in-
dicated on the lower meter scale marked Open Circuit Sensitivity.
If Power Spectral Density measurements are required, see also section 4.6.
*
For the exact sound pressure, the Pistonphone Calibration Chart or the Sound Level
Calibrator manual should be consulted.
**
1 Pa
=
1 Nm
-
2
=
1 0
~Jbar
27
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