17
Slide Switch:
This slide switch is used to select the response time of the
meter circuit as defined in Table 1-1.
3.
BATT TEST
A momentary push-button switch used to check the condi-
tion of the battery.
4.
Microphone
A condenser type microphone that converts sound en-
ergy vibrations into electrical signals.
5.
Output Jacks
Decibel Output
Jack:
A logarithmic output of 1.50 V DC is equivalent to meter
reading of +10 dB looking into 100 K
⍀
load. The recom-
mended plug of this jack is a Switchcraft #850.
RMS Output
Jack:
A weighted or non-weighted output of 1.00 V RMS is equiva-
lent to a meter reading of +10 dB looking into a 100 K
⍀
load. The recommended plug for this jack is a Switchcraft
#850.
External Filter
Jack:
A non-weighted (flat response) output of 120 millivolts RMS
is equivalent to a meter reading of +10 dB looking into 100
K
⍀
load. The recommended plug for this jack is a Switchcraft
#750.
6.
Meter:
A 0-100 μA DC full scale, taut-band movement contains a
dB scale with end markings of –10 dB and +10 dB and 1
dB divisions starting from –5 dB. The upper end of the
scale includes a BATT OK section.
FAST
SLOW
(OSHA)
SOUND LEVEL METER
884-2
TYPE S2A
BATT
TEST
O
S
H
A
130
120
100
110
90
80
70
60
50
OF
F
5
3
8
6
7
1
2
4
Figure 4-1. Operational Items
and Features
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