BRUEL & KJAER 2206 - Procedure for Sound Measurements; Locking of Controls

sure that the measuring pos1t1on, is suitable and hold the Sound Level Meter at arm's
length or mount it on a tripod pointing towards the sound source to minimize reflections
from the operator's body. Finally make sure that the background noise is not so high as
to make the measurements meaningless. For a full treatment of noise measurement
techniques, the reader is referred to B & K publication "The application of B & K equipe-
ment to Acoustic Noise Measurements".
3.5.2. Procedure for Sound Measurements
The 2206 is very simple to operate. To obtain an accurate sound level reading, it is only
necessary to follow this straight forward procedure .
1 .
Screw pistol grip to the tripod bush
2. Check
that the microphone and Input Adaptor are firmly screwed onto the 2206 .
3. Turn the POWER SWITCH to position "Batt." and check that the pointer lies within
the red "Batt." region of the meter scale. If it does not, then the battery should be
replaced (see section 3 .1 .).
4 .
Set the RANGE SWITCH to a high value, to avoid the possibility of overloading the
meter when switching on .
5.
Select a meter response time by turning the POWER SWITCH to either "fast" or
"slow".
6. Allow about 25 seconds for the circuits to charge up.
7 .
If required, calibrate the meter as described in section 3 .4. Calibration is not nor -
mally required each time a reading is made,, unless the user's code of practise
states this explicitly.
8 . Select the desired weighting ("A", "C" or "Lin . ") with the WEIGHTING NETWORK
SELECTOR.
9. Point meter at noise source and turn the RANGE SWITCH down until the meter
gives a reading on the Scale between the RANGE INDICATOR WINDOW and the
"1 0 dB" mark.
10 . The sound level is then the meter scale reading plus the figure in the window .
3.6. LOCKING OF CONTROLS
In some cases where measurements are to be taken by non-technical personnel, the in-
strument can be made more fool-proof by locking the controls . The attenuator RANGE
SWITCH and the WEIGHTING NETWORK SELECTOR may be locked in any desired posi-
tion, as described below .
For example, if measurements are always to be made with the A weighting network,
around 80 dB, the controls can be locked in these positions . The range of the meter will
then be 70dB (A). By pressing the " + 10dB" button, a further 10dB is added to the
range, i.e. the range with the button depressed would then be 80 dB (A)- 1 00 dB (A).
9.