Version 1.2 9/05
2
Introduction
Congratulations on your purchase of the Extech SL120 Sound Level Monitor. Designed for
wall mount, desk, tripod mount or hand held operation, this meter meets ANSI and IEC
Type 2 Sound Level Meter standards. Included is a High Limit Set Point with a large OVER
indication when the set level is exceeded. An Alarm Output can be used in conjunction with
the optional Alarm Module Kit to power a larger or a remote indicating device such as a
“QUIET” sign. Professional features include programmable A/C Weighting and Fast/Slow
Response time, Max Memory with time stamp, and a Clock display. The microphone can
be rotated 180 degrees to accommodate any meter location or it can be placed at a remote
location using the optional Remote Microphone Cable. A programmable ON/OFF time
extends battery life to 30 days when programmed 8 hours per day. Careful use of this
meter will provide years of reliable service.
Specifications
Applicable standards Meets IEC 60651-1979 and ANSI S1.4 1983 Type 2
SLM standards
Display 4.6” x 3.125” multifunction LCD
Frequency bandwidth 31.5 Hz to 8 KHz
Microphone 0.5” Electret Condensor Microphone (remoteable)
Measurement ranges 30 to 80dB, 60 to 110dB, 80 to 130dB
Frequency weighting ‘A’ and ‘C’ (Programmable)
Response time Fast (125ms) / Slow (1s) (Programmable)
Resolution 0.1dB
Max Hold Maximum reading is displayed with time
Alarm output 3.5mm Mono Phone Plug, Maximum: 3.4mA @ 5 Vdc,
Minimum Output Voltage: 2.5 Vdc
Limit range 30 to 130dB
Under range indication “- - -“
Over range indication “OL”
Power 8 AA Batteries; optional AC adaptor (9V@350ma)
Battery life 240hrs continuous (approx); 30 days @ 8hrs/day
Operating temperature 32 to 122
o
F (0 to 50
o
C)
Operating humidity Less than 80% RH
Dimensions / Weight 8.75x7.1x1.25" / 0.63 lbs. (22x18x3.2mm / 285g)
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