Table 1. hlter_lM Eleetlqcal Noise Levels o[ t/le
Mode/215 Sotmd Level _lle ter (ill dB below/'till setth! defleclioll).
RANGE SELECTOR SWITCH POSITION
40 50 60 70 50 90 100 110 120 130
BROAD BAND
(ALL PASS) 27 37 ,16 54 53 54 55 55 55 55
31.5 48 57 67 75 78 S0 E0 S0 EO S0
¢¢
__ 63 44 54 64 72 76 77 77 77 77 77
I 125 41 51 61 70 73 75 75 76 76 76
_ _ 250 39 49 59 69 71 73 73 73 73 73
=c__ = 500 38 48 5B 68 59 70 70 70 70 70
mm _ 1K 37 47 57 57 66 67 68 6B 68 68
_: 2K 36 46 56 64 65 65 65 65 65 65
P,u.
I _ _4K 34 44 54 63 62 63 64 64 6d 64
BK 34 44 54 63 61 62 63 63 63 63
The 215 is designed to he hand-held, If tile unit is placed on any
Imrd surface such as a I_d:le.top, cheek to see that no sihqlificant
mechanical vibration exists which might yield false meter readings.
Tile microphone will pick tip vihraHon as if it, were souncl.
Before each use of any battery-powered instrmnent, tile condi-
tion of the batt_ry should he checked to =t_sure proper operation. On
the Model 215 tile hatterit_s are tested by moving tile ON-OFF-BAT
switch I,o tile BAT position, mid clmcking tlutt the meter pointer
deflects to tile heavy wcen Iim_ nlarked B/¢I'TI'_B,Y CHECK. If tile
meter deflection is below this area, Lhe batteries must be replaced
before [LIly nleastlronlenLs are taken,
Basic Ol)eratioll
Before turning tile meter on, set tile dB I{ANGI'_ selector at or
above the expected sound pressure level. Choose tile desired weigllting
characteristic and select rest or s[ow meter response. Tlmn move tile
ON-OFF-BAT switch to the ON position. 'l'l_e instrument is now
ready to make sotmd level measurements.
Maximum readability and accuracy are obtainecl with tile meter
pohRer deflected to tile higher part of tile meter scale. When pos-
sible, therefore, select tlu_ raFige to prodttce a rt_aditlg })etweetl 0 alld
+10 on the met=zr,
7
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