BRUEL & KJAER 2203 Instructions And Applications

uring microphone. The gain of the input amplifier is then adjusted to
calibrate the Meter to this reference level. For the Sound Level Calibra-
tor (4230) this is 94dB and for the Pistonphone (4220) approx. 124dB.
An individual calibration chart giving exact sound level output is pro-
vided with the Pistonphone.
The
calibration procedure is as follows:
1. Attach the· desired Microphone, extension rods, or cables and adap-
tors.
2.
Pull METER SWITCH out and wait about 20 seconds for instrument
to warm up.
3. Set METER SWITCH to "Batt." to check the condition of the batter-
ies.
4. Set METER SWITCH to "Fast" and "C".
5. Set the ATIENUATORS to the range indicated in Table 3.1 depend-
ing on microphone sensitivity.
6. The sound pressure level when calibrated will equal the ATIENUA-
TOR setting plus the meter indication plus the correction factor
given in Table 3.1.
7. Turn on the Sound Level Calibrator or Pistonphone, check that it is
functioning properly, and place over the Microphone.
8a. For the Pistonphone, use a small screwdriver to adjust the ADJ. po-
tentiometer so the meter indicates the sound pressure level (see
step
6 above) given on the Pistonphone calibration chart. Correct as
necessary
for barometric pressure.
Microphone Open
Sound Level Calibrator Pistonphone
Correction
Circuit Sensitivity
ATTENUATOR SETTING (dB)
ATTENUATOR SETTING (dB)
Factor
(mV/Pa) (dB)
31 ,5
-63
90
120
0
10
-20
80
110 +10
3,15-
6,3 70 100 + 20
1 -
2 60
90
+ 30
073028
Table 3. 1. Attenuator settings for calibration
14

BRUEL & KJAER 2203 Specifications

General

Brand	BRUEL & KJAER
Model	2203
Category	Measuring Instruments
Language	English