User's Manual
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Sound Level Alert
Model SL130
Meets ANSI and IEC Type 2 Sound Level Meter Standards
Settable High Limit with large bright High/Low 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.
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Introduction
Congratulations on your purchase of the Extech SL130 Sound Level Alert. 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/Low Limit Set Point with 4 two
color high intensity LED limit exceed indicators and 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. The bright LED’s are functional only when
the AC power adaptor is used. 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 11.7 x 7.94cm (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’
Response time Fast (125ms) / Slow (1s)
Resolution 0.1dB
Max Hold Maximum reading is displayed with time stamp
Alarm output 3.5mm Mono Phone Plug, 3.4mA @ 5 Vdc, typical
Limit range 30 to 130dB
Under range indication “- - -“
Over range indication “OL”
Power AC adaptor (9V@500ma) or 8 AA batteries
Battery life 240hrs continuous (approx); 30 days @ 8hrs/day
Operating temperature 0 to 50oC (32 to 122oF)
Operating humidity Less than 80% RH
Dimensions / Weight 22x18x3.2cm / 285g (8.75x7.1x1.25" / 0.63 lbs).
SLM standards
(LED’s are not functional when battery powered)
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Version 3.2 8/07
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Meter Description
1. Microphone
2. Over Limit Display
3. Bargraph
4. dB display
5. OFF/ON/AUTO switch
6. Alert LEDs
7. Clock display
8. Max level display with time stamp
9. Set limit
10. MAX RESET button
Rear Control 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
Side Panel
1. Alert switch – Green position
2. Alert switch – Red-Green position
3. Alert switch – Red position
4. High-Low Alarm switch
5. Remote Alarm output connector
6. AC adaptor connector
30-80
1
60-110
80-130
LIMIT
5
4
6
3
2
Rear Panel
1. Tilt stand
2. Battery compartment
3. AC Adaptor connector
4. Remote Alarm output connector
5. Windscreen
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Sound Level Monitor Operation
Measurement Considerations
1. Use a windscreen to cover the microphone in windy conditions.
2. Calibrate the meter often, especially if the meter has been idle for a long period of time.
3. Do not store/operate the meter in areas of high temperature or humidity.
4. Keep the meter and the microphone dry.
5. Avoid severe vibration when using the meter.
6. Remove the battery when the meter will be stored for long periods of time.
Initial Configuration
1. Connect the AC adaptor to the side or rear AC adaptor connector
OR Install 8 AA batteries
2. Setting the TIME
a) Press and Hold the Time SET button until the hours display
begins to flash.
b) Press the Time up arrow button until the hour is set.
c) Press the SET button. The minutes display will flash. Adjust as needed.
d) Press the SET button to step through and the arrow button to adjust;
Time of day Hour
Time of day Minutes
Time of day AM / PM / 24 Hour
Year
Month
Day
Auto ON Hour
Auto ON Minutes
Auto OFF Hour
Auto OFF Minute
A/C Frequency Weighting
Change the Frequency Weighting by pressing the 'A/C' button. The 'A' or 'C' icon will
appear on the display.
With ‘A’ weighting selected, the frequency response of the meter is similar to the response
of the human ear. ‘A’ weighting is commonly used for environmental or hearing
conservation programs such as OSHA regulatory testing and noise ordinance law
enforcement. ‘C’ weighting is a much flatter response and is suitable for the sound level
analysis of machines, engines, etc.
Most noise measurements are performed using 'A' Weighting and SLOW Response.
Slow/ Fast Response
Press the button to select Fast or Slow response as desired. F or S will appear in the
bottom of the LCD display.
Select FAST to capture noise peaks and noises that occur very quickly. Select the SLOW
response to monitor a sound source that has a consistent noise level or to average quickly
changing levels.
Select Slow response for most applications.
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Range Selection
Slide the Range switch to the 30-80, 60-110 or the 80-130 position.
The selected range will be indicated on the LCD bargraph. If the
measured dB level exceeds the range selected “OL” will be
displayed. If the measured dB level is below the selected range “- - -“ will be
displayed.
Normally, select the range in which the upper dB level is greater than any
expected sound pressure level. The 60 to 110dB range is the most commonly
used range. Use the 30 to 80dB range in quieter areas such as offices and
classrooms.
Note: When the range is changed the Max display may indicate an overload “OL”. Press
the MAX RESET button to clear the MAX display.
High Limit Set
Press the up or down LIMIT arrow buttons to set the High/Low limit
set=point as displayed on the LCD. If the measured dB level
exceeds the set limit, the indication will appear in the display
and the over limit signal will appear at the alarm output connector.
The display indication and output signal will remain active as long as the sound pressure
level exceeds the set limit.
High/Low LED Alert
The four LEDs are used to alert users when a sound level either exceeds or goes below
the Limit set-point. This feature is available only while the AC adaptor is used to power the
meter. It is disabled under battery power.
The LEDs will provide a steady or flashing colored indication depending on the setting of
the side panel ALARM and Alert switch settings.
The three Alert switch positions are: (1) RED, (2) RED-GREEN, (3) GREEN
Alarm
Switch
High
ALARM
Low
ALARM
Alert Switch LED response
Red (1) LED’s flash red while dB level exceeds set point.
Red-Green (2)
Green (3)
Green (3) LED’s are green while dB level is below set point.
Red-Green (2)
Red (3)
LED’s flash red while dB level exceeds set point.
40 second green indication when level transitions from
high to low.
40 second green indication when level transitions from
high to low.
LED’s are green while dB level is below set point.
40 second flashing red indication when level
transitions from low to high.
40 second flashing red indication when level
transitions from low to high.
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MAX Hold
The MAX display indicates and holds the highest dB level measured
since the meter was turned on or since the Max Reset button was
pressed. The time and date of the max reading is also displayed.
To clear the display and start a new measurement session, press the
front panel MAX RESET button. If the measured level exceeds the
maximum for the range selected the MAX display will indicate “OL” (overload).
Programmable OFF/ON/AUTO time
The meter is powered by 8 AA batteries or via an AC adaptor for permanent installations.
Continuous battery life is approximately 240 hours (10 days). By programming the ON/OFF
time, the battery life can be greatly extended (30 days assuming an 8 hour day). The ON
and OFF times are programmed as described in the initial configuration
paragraph. The meter will operate continuously with the power switch in
the ON position. The ON/OFF time will be controlled by the meter when
the power switch is set to the AUTO position.
Calibration
The sound level meter should be calibrated on a regular basis
to assure that the meter’s performance and microphone
sensitivity has not change. Some operational directives
require daily calibration checks (OSHA). Extech offers several
acoustic calibrators to perform the calibration.
1. Set the meter to the 60 to 110dB or 80 to 130dB range.
2. Place the external calibrator over the Sound Level
Monitor's microphone and turn the Calibrator on.
3. The meter should read close to the calibrator's dB output
level. Typical Calibrator output levels are 94dB and 114dB.
4. If the meter is within ± 0.2 dB of the calibrator’s output, no
adjustment is necessary.
5. Adjust the calibration pot on the rear of the meter to the
proper level.
Meter Placement
The meter can be used Handheld, Wall mounted, Desk mounted or Tripod mounted. For
wall mount operation, orient the microphone perpendicular to the wall to minimize the
affect of acoustic reflections. For desk mounting, extend the rear legs and lock in place
with the hinged locks. The tripod mounting nut is located on the bottom of the unit.
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Remote Microphone (optional)
The optional 15’ remote microphone
cable can be used to place the microphone in one
location while viewing the dB levels and/or generating a high limit
alarm at another location. To remove the microphone, unscrew
the holding collar and lift the microphone off the connector. The
extension cable can then be plugged into the matching
connectors. Calibration should be performed after the cable is
installed.
Alarm Output (optional)
The alarm output drives the optional Remote Alarm Relay Module (cable and relay) when
the LIMIT set point is exceeded. The relay module can be used to power external warning
signs, “QUIET” signs or other indicating devices when the sound level is higher than the
programmed limit. Refer to the manual supplied with the module for connection
information.
Rear AC Adaptor and Alarm outputs.
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Battery Replacement
AC power is the normal power source for this meter. If 8 AA batteries are used, they are
located in the rear battery compartment. When the battery icon appears on the meter's
LCD, it is time to replace the batteries.
1. Turn power off.
2. Open the rear battery cover
3. Insert the batteries into battery holder, observing the correct polarity.
4. Put the battery cover back in place.
Back to the Extech SL130 Product Info Page
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Version 3.2 8/07
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