Amprobe SM-10 User manual

SM-10
SM-20
Sound Level Meters
Users Manual
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Melrose, MA 02176
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English
SM-10 / SM-20
Sound Level Meters
Users Manual
SM10_Rev001
© 2008 Amprobe Test Tools.
All rights reserved.

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Limited Warranty and Limitation of Liability
Your Amprobe product will be free from defects in material and workmanship for
1 year from the date of purchase. This warranty does not cover fuses, disposable
batteries or damage from accident, neglect, misuse, alteration, contamination,
or abnormal conditions of operation or handling. Resellers are not authorized
to extend any other warranty on Amprobe’s behalf. To obtain service during the
warranty period, return the product with proof of purchase to an authorized
Amprobe Test Tools Service Center or to an Amprobe dealer or distributor. See
Repair Section for details. THIS WARRANTY IS YOUR ONLY REMEDY. ALL OTHER
WARRANTIES - WHETHER EXPRESS, IMPLIED OR STAUTORY - INCLUDING IMPLIED
WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY,
ARE HEREBY DISCLAIMED. MANUFACTURER SHALL NOT BE LIABLE FOR ANY
SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES,
ARISING FROM ANY CAUSE OR THEORY. Since some states or countries do not
allow the exclusion or limitation of an implied warranty or of incidental or
consequential damages, this limitation of liability may not apply to you.
Repair
All test tools returned for warranty or non-warranty repair or for calibration
should be accompanied by the following: your name, company’s name, address,
telephone number, and proof of purchase. Additionally, please include a brief
description of the problem or the service requested and include the test leads
with the meter. Non-warranty repair or replacement charges should be remitted
in the form of a check, a money order, credit card with expiration date, or a
purchase order made payable to Amprobe® Test Tools.
In-Warranty Repairs and Replacement – All Countries
Please read the warranty statement and check your battery before requesting
repair. During the warranty period any defective test tool can be returned to your
Amprobe® Test Tools distributor for an exchange for the same or like product.
Please check the “Where to Buy” section on www.amprobe.com for a list of
distributors near you. Additionally, in the United States and Canada In-Warranty
repair and replacement units can also be sent to a Amprobe® Test Tools Service
Center (see address below).
Non-Warranty Repairs and Replacement – US and Canada
Non-warranty repairs in the United States and Canada should be sent to a
Amprobe® Test Tools Service Center. Call Amprobe® Test Tools or inquire at your
point of purchase for current repair and replacement rates.
Non-Warranty Repairs and Replacement – Europe
European non-warranty units can be replaced by your Amprobe® Test Tools
distributor for a nominal charge. Please check the “Where to Buy” section on
www.amprobe.com for a list of distributors near you.
*(Correspondence only – no repair or replacement available from this address.
European customers please contact your distributor.)

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➊Windscreen
➋Microphone
➌
LCD display
➍Frequency weighting select button
➎Maximum/Minimum Hold button
➏Power button
➐Backlight button
➑Time weighting select button
➒Data Hold button
➓Record button
REC
HOLD
+
MAX
FAST
SLOW
A / C
Fast Slow
HOLD MAX dBA
MIN dBCN
1
2
3
4
5
67
8
9
10
HOLD
+
MAX
FAST
SLOW
A / C
Fast Slow
HOLD MAX dBA
MIN dBCN
3
4
5
67
8
9
1
2
SM-10 SM-20

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SM-10 / SM-20
Sound Level Meters
CONTENTS
Symbols................................................................................................................. 5
Unpacking and Inspection................................................................................... 5
Introduction..........................................................................................................5
Operation .............................................................................................................5
MAX/MIN......................................................................................................... 6
HOLD ...............................................................................................................6
Backlight..........................................................................................................6
Record (SM-20 Only)....................................................................................... 6
Calibration Procedures .................................................................................. 6
Specifications........................................................................................................ 7
Maintenance and Repair ....................................................................................8
Battery Replacement ..................................................................................... 8

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SYMBOLS
Refer to the manual Do not dispose of this
product as unsorted
municipal waste.
Conforms to relevant
Australian standards. Complies with EU directives
Warning and Precautions
For wind speeds over 10 m/sec (22.3 mph), use the windscreen on the•
microphone.
For general sound level measurements use A weighting. For checking the•
low-frequency content of noise use C weighting. If the C-Weighted level
is much higher than the A-weighted level, then there is a large amount of
low-frequency noise
For normal measurements use the FAST mode. For checking average level•
of fluctuation noise use the SLOW mode.
UNPACKING AND INSPECTION
Your shipping carton should include:
1 SM-10 / 20 sound level meter
1 9 volt battery
1 Download Suite CD-ROM (SM-20)
1 RS-232 to mini stereo phono jack (SM-20)
1 Users Manual
If any of the items are damaged or missing, return the complete package to
the place of purchase for an exchange.
INTRODUCTION
This Sound Level Meter has been designed to meet the measurement
requirements of safety Engineers, Health, Industrial safety offices and quality
control in various environments. This unit conforms to the IEC651 Type 2,
ANSI S1.4 Type 2, JISC1502 requirements for Sound Level Meters.
OPERATION
Press1. button for power ON.
Select the desired response time and weighting. If the sound source2.
consists of short bursts or only catching sound peak, set response to FAST.
To measure average sound level, use the slow setting. Select A weighting
for general noise sound level and C weighting for measuring sound level
of acoustic material.

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Hold the instrument comfortably in hand or fix on tripod and point the3.
microphone at the suspected noise source, the sound pressure level will
be displayed.
MAX/MIN
The MAX MIN feature reads and updates the display to show the maximum
or minimum average value measured after you press the MAX MIN button.
Pressing the MAX MIN button for less than 1 second will put the meter into
a mode of displaying the maximum, minimum, average, or actual readings.
Each time the button is pressed, the meter will alternate between MAX
and MIN. Press the MAX MIN button for more than 2 seconds to disable this
feature.
HOLD
Freezes the reading present on the LCD at the moment the button is pressed.
To use this button feature set up the meter for the type of measurement and
range desired before pressing the button.
Backlight
Press the button you enable the display backlight to easy readings in dark
environments. Press more than 1 second to disable backlight, which however
it automatically OFF after 15 seconds.
Record (SM-20 Only)
Refer to CD-ROM for Download SuiteTM instructions .
To transfer the data from the instrument to the PC the following procedure
must be followed:
Switch ON the instrument1.
Connect the serial output of the instrument to the serial output of the PC2.
through the serial cable
Press the REC button on the SM-20.3.
Install the software and start it – Close the introduction window4.
Press F2 and follow the commands.5.
Refer to software help file for further instructions.6.
Calibration Procedures
Using a standard Acoustic Calibrator (SM-CAL1) (94dB, 1 kHz Sine wave)
Set meter for dBA and FAST.1.
Insert the Microphone nozzle carefully into the insertion hole of the2.
calibrator.
Press A/C button then press the HOLD button, hold the 2 buttons at3.
the same time more than 1 second. LCD will be blinking to confirm
calibration.

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When LCD blinked, release the A/C and the HOLD buttons. The sound level4.
meter will display 94.0 dBA . The calibration is done.
The 94 dB calibration process can be repeated until the meter reads 94.05.
dB. Recalibration cycle: 1 year.
SPECIFICATIONS
General
Display: 4 digits LCD
Microphone: 1/2 inch Electret condenser microphone.
Low Battery Indication: Replace battery when LCD displays “”.
Power Supply: 9V NEDA 1604, IEC 6F22, JIS 006P battery.
Power Life : Approx. 50 hrs (alkaline Battery).
Auto Power Off: Approx. 5 min
Environment: Indoor operation, < 2000 m
Temperature / Humidity
Operation: 5 °C to 40 °C (41°F to 104°F); < 80% RH
Storage: -10 °C to 60 °C (14°F to 140°F); < 70 %RH
Dimension: 200 x 55 x 38 mm (7.8 x 2.2 x 1.5 in)
Weight: 233g. (0.5 lb.) Including battery
-EMC: EN61326-1 This product complies with requirements of the
following European Community Directives: 89/336/EEC (Electromagnetic
Compatibility) and 73/23/EEC (Low Voltage) as amended by 93/68/EEC (CE
Marking). However, electrical noise or intense electromagnetic fields in the
vicinity of the equipment may disturb the measurement circuit. Measuring
instruments will also respond to unwanted signals that may be present within
the measurement circuit. Users should exercise care and take appropriate
precautions to avoid misleading results when making measurements in the
presence of electronic interference.
Electrical (Audio)
Standard applied: IEC 651 Type2, ANSI 1.4 Type 2.
Dynamic range: 50 dB.
Resolution: 0.1 dB, Display Update: 0.5 sec.
Time weighting: FAST(125mS), SLOW(1 sec).
Frequency range: 31.5 Hz to 8 kHz.
Measuring level range: (Auto Range)
A Weighting: 30 to 130 dB.
C Weighting: 35 to 130 dB.
Accuracy: ± 1.5 dB.
Calibration cycle: 1 year.

MAINTENANCE AND REPAIR
If there appears to be a malfunction during the operation of the meter, the
following steps should be performed in order to isolate the cause of the
problem.
Check the battery. Replace the battery immediately when the symbol1.
“” appears on the LCD.
Review the operating instructions for possible mistakes in operating2.
procedure.
Except for the replacement of the battery, repair of the meter should be
performed only by a Factory Authorized Service Center or by other qualified
instrument service personnel. The front panel and case can be cleaned with
a mild solution of detergent and water. Apply sparingly with a soft cloth and
allow to dry completely before using. Do not use aromatic hydrocarbons or
chlorinated solvents for cleaning.
Battery Replacement
Turn off the meter and slide out the battery cover. Replace the battery1.
with a NEDA type 1604 or equivalent 9V alkaline battery. Replace the
cover.
Remove battery when the SM-10/SM-20 is not used for extended period.2.
Battery Replacement
OPEN
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