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3.
Set controls on 201 0 to the following positions:
GAIN CONTROL
INPUT SECTION ATIENUATOR
OUTPUT SECTION ATIENUATOR
EFFECTIVE AVERAGING TIME
READ OUT SELECTOR
CALIBRATION
4.
Select push buttons:
CALIBRATION
INPUT
FREQUENCY RESPONSE
"Cal."
"1 00 mV"
"x
1 "
"Fast"
"Lin", "AC" or "DC"
"Cal. Off"
"Ref. 50 mV"
"Direct" or "Preamp" as required
"Linear"
The meter needle should now deflect to the red mark on the scale which indicates
50 mV. If necessary, adjust the SENS. potentiometer beside the appropriate input
socket.
5.
Repeat procedure for the other input if both inputs are required. If Power Spectral
Density measurements are required, see also Section 4.6.
3.2.2. Calibration for Sound Measurements
26
Using a Pistonphene Type 4220 or Sound Level Calibrator Type 4230
The B & K Pistonphone Type 4220 ( 1 24 dB* at 250Hz) or the B & K Sound Level Calibra-
tor Type 4230 (94 dB* at 1000Hz) provide stable, accurate sources of calibration.
1.
Carry out the preliminary adjustments (section 3.1) if necessary.
2.
Fit the meter scale appropriate to the sensitivity of the microphone being used, see
Table 3.1.
Microphone Open Circuit
B
&
K Microphone Type
Scale No.
Sensitivity
26- 160 mV
per Pa
4144 4145 4146 41 60
SA
0056
4164 41 65 41 66
5 - 30 mV
per Pa
4125 4133 4134
SA
0057
4147 4148 4149
0,80 - 5 mV
per Pa
4135 4136
SA
0060
0,26 - 1,6 mV
per Pa
4138
SA
0083
740077/
1
Table 3. 1. Microphone Scales for use with 2010
3.
Plug the microphone and associated preamplifier into the appropriate input of the
2010.
*
For the exact sound pressure, the Pistonphone Calibration Chart or the Sound Level Calibrator manual should
be consulted.
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