MODEL 215-45
OCTAVE BAND ANALYZER
GENERAL
The Model 215-15 Octave Blind Analyzer is made tq) of the 215
Sottnd I.ovel Meter and tim OB-,I5 Octave Band Filter Set. The pre-
ceeding instructions for these two units should be read before the
following instructions ill that all tile procedural infornlation for the
meter and filter set is apl)licable to tile Analyzer. The two units arc
connected together throtlgh the six pin connector, and arc locked
together with tile separate thumb screw provided. The rules of hold-
ing tile unit away from tile body. or on a tripod, are tile same as for
tile 215 Soul'=d Level Meter.
OPERATING PROCEDURE
1. Switch the 215 Sound Level Meter to the BArr position and
check to see tiler the motor needle deflects into the I.q'een area. If the
llet_d]o does not reit[!]l the green llroa, replace batteries,
2. Check the operation of tile amdyzer as outlined on Page 18.
3. Set the dB ICANGE selector lmd FAST-SLOW switch on the
215 as appropriate for the noise being ine_tsured,
,I. Set the WEIGHTING switch on the 215 to EXT (external}.
This switch position, and only this position, electrically engages tile
OB-d5 Filter.
5. If you wish to determine all fl'eCltlellcy bands of noise pres.
eat, start with tile OB-:t5 FREQUENCY selector at 31 Hz.
6. Turn tile 215 to ON and you will be leading Iloise in the 31
Ilz band only. Adjust dB RANGE selector oil tile 215 to obtain the
best sca[_! rcadirJg on the reeler and then record the rending.
7. Repeat step 6 for each of the frequency bands Lo 8 Kllz.
Those reildings call be plotted on a chart of dB vs. eenterband fre-
quency.
8. ]f you wish to know overall noise unweightod, set the
weighting switch to LIN (linear). You will then be readi¢lg albpass
fiat rosllonse which IS tile noise SHill or ldl tile blinds nl(!llsuri!d,
17
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