BRUEL & KJAER 2203 Instructions And Applications

7. The sound pressure level (SPL) equals the meter scale deflection plus
the attenuator setting read inside the red lines. It may also be neces-
sary
to add the K-factor under certain conditions (See Section 3. 2. 2).
Note
the SPL along with the weighting network and meter damping
used.
N.B. The importance of following the above procedure needs special
emphasis. Some operators may find it convenient to follow an ab-
breviated (but erroneous) procedure in which the desired weighting
network is selected directly without first making the INPUT ATTENU-
ATOR adjustment in the "Lin." mode (steps 2 & 4).
This may result in severe input amplifier overload and hence inaccu-
rate measurements. Frequently the level of low frequency sound
components exceeds the level of the weighted audible sound field.
These low frequencies may then overload the input amplifier. If the
INPUT ATTENUATOR is first adjusted in the "Lin." mode for an on-
scale meter deflection, input amplifier operation without overload is
ensured.
3.4. CALIBRATION FOR VIBRATION MEASUREMENTS
3.4.1. Using Accelerometer Calibrator 4291
The Accelerometer Calibrator Type 4291 generates a vibration level of
1 g peak (0, 707 g RMS) at 500 radians per second (79, 6Hz). Calibra-
tion and measurement can also be made for velocity and displacement
using Integrator Type ZR 0020. The calibration procedure is as follows:
18
Input Stage
zc 0007
Ad aptor
JJ 2614
Adaptor Integrator
Ad aptor
JJ 0028
DB 0962 ZR 0020 17 3309
Fig. 3. 1. Connection of accelerometer

BRUEL & KJAER 2203 Specifications

General

Brand	BRUEL & KJAER
Model	2203
Category	Measuring Instruments
Language	English