User's Manual
Sound Level Alert
Model SL130
Meets IEC Type 2 Sound Level Meter Standards
Settable Limit with large bright High/Low LED level exceed indicators
Wall or Desk mountable
Extra large LCD display with bargraph
Maximum level display with time stamp
Introduction
Congratulations on your purchase of the Extech SL130 Sound Level Alert.Designedfor
wall mount, desk, tripod mount operation, this meter meets 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 to drive a larger or a remote indicating device such as a “QUIET” sign.
Professional features include programmableA/CWeighting 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. The brightLED’s are functionalonlywhen
the AC power adaptor is used. Careful use of this meter will provide years of reliable
service.
Specifications
Applicable standards
Display 11.7 x 7.94cm (4.6” x 3.125”) multifunction LCD
Frequency bandwidth 31.5 Hz to 8 KHz
Microphone 13.2mm (0.5”) Electret Condensor Microphone
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
Power AC adaptor (9V@500ma)
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).
Meets IEC 60651-1979 and ANSI S1.4 1983 Type 2
SLM standards
“- - -“
“OL”
(8 AA batteries without the LED feature)
(LED’s are not functional when battery powered)
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Meter Description
1. Microphone
2. Over LimitDisplay
3. Bargraph
4. dBdisplay
5. OFF/ON/AUTO switch
6. Alert LEDs
7. Clock display
8. Max leveldisplaywith time stamp
9. Set limit
10. MAX RESET button
Rear Control Panel
1. Rangeselectswitch
2. Time set buttons
3. Limitset buttons
4. Calibrationadjustment
5. A/Cselectbutton
6. F/S selectbutton
Side Panel
1. LEDcolor switch– Greenposition
2. LEDcolor switch– Red-Greenposition
3. LEDcolor switch– Red position
4. High-LowLimit Alarmswitch
5. Remote Alarm outputconnector
6. ACadaptorconnector
Rear Panel
1. Tiltstand
2. Batterycompartment
3. AC Adaptorconnector
4. Remote Alarm outputconnector
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 batteries 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
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 andnoise ordinancelaw
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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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 LED Color switch settings.
The three LED Color Selection 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 above 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 above set point.
40 second flashing red indication when level
transitions from High to Low.
40 second flashing red indication when level
transitions from High to Low.
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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/AUTOtime
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 theON/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. 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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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 iconappears 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.
You, as the end user, are legally bound (Battery ordinance) to return all used
batteries and accumulators; disposal in the household garbage is prohibited!
You can hand over your used batteries / accumulators, gratuitously, at the
collection points for our branches in your community or wherever batteries /
accumulators are sold!
Disposal
Follow the valid legal stipulations in respect of the disposal of the device at the end of its
lifecycle
CAUTIONS
This device is not a toy and must not reach children’s hands. It contains hazardous
objects as well as small parts that the children could swallow. In case a child
swallows any of them, please contact a physician immediately
Do not leave batteries and packing material lying around unattended; they can be
dangerous for children if they use them as toys
In case the device is going to be unused for an extended period of time, remove the
batteries to prevent them from draining
Expired or damaged batteries can cause cauterizationon contactwith the skin.
Always, therefore, use suitable hand gloves in such cases
See that the batteries are not short-circuited. Do not throw batteries into the fire.
All rights reserved including the right of reproduction in whole or in part in any form.
Copyright © 2006 Extech Instruments Corporation.
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