BRUEL & KJAER 2203 Instructions And Applications

8b . For the Sound Level Calibrator, use a small screwdriver to adjust
the ADJ. potentiometer so the meter indicates the sound pressure
level as follows.
One-inch free field microphones: 93,6 dB
Half-inch free field microphones : 93,8 dB
Pressure response
microphones (any size): 94 ,0 dB
Although the Sound Level Calibrator provides an output of 94 dB,
the figures for the free field microphones include the free field cor-
rections
for the microphones at the frequency of the Calibrator,
1000Hz .
3.2.2. Using the built-in Reference Voltage
A stable internal voltage (± 0,2 dB at approx. 1 kHz) is fed to the input
amplifier whose gain is adjusted to make the 2203 correspond to the
open circuit sensitivity of the Microphone used. However, when possi-
ble, calibration is preferable using the Pistonphone or Sound Level Cali-
brator since this will take i nto account all. possible Microphone and in-
strument changes in sensitivity due to environmental factors.
The calibration procedure using the built-in reference voltage is as fol-
lows:
1. Choose desired Microphone and accessories.
2.
Pull METER SWITCH out and wait about 20 seconds for instrument
to warm up.
3.
Set METER SWITCH to "Batt ." to check battery condition .
4 . Set METER SWITCH to "Fast" and "Lin" .
5. Set ATIENUATORS to "Ref." (inside red lines).
6. Using a small screwdriver set the ADJ. potentiometer for the Micro-
phone K-factor (defined below) on the lower red meter scale. If the K-
factor is outside the -2 to + 4 range, adjust for a K-factor of 0 and
add
the K-factor to all readings. However, for K-factors between + 8
and +
14, the 2203 can be set for a K-factor of (K-1 0) and 1 0 dB
can
then be added to all reading~ .
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BRUEL & KJAER 2203 Specifications

General

Brand	BRUEL & KJAER
Model	2203
Category	Measuring Instruments
Language	English