Extech Instruments SL120 User Manual
User's Manual
Sound Level Monitor
Model SL120
Meets ANSI and IEC Type 2 Sound Level Meter Standards
Settable High Limit with large OVER indication and Alarm Output
Wall or Desk mountable
Extra large LCD display with bargraph
Maximum level display with time stamp
Optional alarm kit drives remote over limit indicators.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com
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
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,
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 122oF (0 to 50oC)
Operating humidity Less than 80% RH
Dimensions / Weight 8.75x7.1x1.25" / 0.63 lbs. (22x18x3.2mm / 285g)
SLM standards
Minimum Output Voltage: 2.5 Vdc
2
Version 1.2 9/05
Meter Description
1. Microphone
2. Over Limit Display
3. Bargraph
4. dB display
5. OFF/ON/AUTO switch
6. Clock display
7. Max level display with time stamp
8. Set limit
9. MAX RESET button
Rear Panel
1. Range select switch
2. Time set buttons
3. Limit set buttons
4. Calibration adjustment
5. A/C select button
6. F/S select button
1
6
2
3
4
7
8
9
5
30-80
1
60-110
80-130
3
2
LIMIT
5
4
6
3
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com
Version 1.2 9/05
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