Greenlee SM-100 User manual
999 3809.0 © 2000 Greenlee Textron IM 1484 10/00
SM-100
SOUND METER
MEDIDOR
DE SONIDO
SONOMETRE
Read and understand all of the instructions
and safety information in this manual before
operating or servicing this tool.
Lea y entienda todas las instrucciones y la
información sobre seguridad que aparecen
en este manual, antes de manejar estas
herramientas o darles mantenimiento.
Lire attentivement et bien comprendre toutes
les instructions et les informations sur la sécurité
de ce manuel avant d‘utiliser ou de procéder à
l‘entretien de cet outil.
INSTRUCTION MANUAL
INSTRUCTION MANUAL
MANUAL DE INSTRUCCIONES
MANUEL D’INSTRUCTIONS
2
Description
The Greenlee SM-100 Sound Meter is a hand-held testing device intended to
measure sound levels from 35 dB to 130 dB, from 31.5 Hz to 8 kHz. The
frequency-weighted response and response times are in accordance with the
requirements of IEC 651/ANSI S1.4 for Type 2 sound level meters.
Specialized functions and capabilities include:
• Two measurement scales: A-weighted scale (for common sounds) and
C-weighted scale (for low frequency sounds).
• AC and DC signal output for interfacing with a frequency analyzer, level
recorder, FFT analyzer, graphic recorder, etc.
• Three response modes: Slow (slow response time, for recording
continuous sounds), Fast (fast response time, for capturing short bursts or
intermittent noise), and Maximum Hold (for holding the maximum
measured sound level on the display).
• Tripod mount: A threaded hole (1/4–20 UNC) provides a method for tripod
mounting for long-term temperature measurement.
Safety
Safety is essential in the use and maintenance of Greenlee tools and
equipment. This instruction manual and any markings on the tool provide
information for avoiding hazards and unsafe practices related to the use of
this tool. Observe all of the safety information provided.
Purpose
This instruction manual is intended to familiarize all personnel with the safe
operation and maintenance procedures for Greenlee SM-100 Sound Meter.
Keep this manual available to all personnel.
Replacement manuals are available upon request at no charge.
Greenlee and are registered trademarks of Greenlee Textron.
KEEP THIS MANUAL
SM-100
3
Important Safety Information
This symbol is used to call your attention to hazards or unsafe
practices which could result in an injury or property damage. The
signal word, defined below, indicates the severity of the hazard. The
message after the signal word provides information for preventing or
avoiding the hazard.
SAFETY ALERT SYMBOL
Immediate hazards which, if not avoided, WILL result in severe injury
or death.
Hazards which, if not avoided, COULD result in severe injury or death.
Hazards or unsafe practices which, if not avoided, MAY result in injury
or property damage.
Read and understand this material before
operating or servicing this equipment. Failure to
understand how to safely operate this tool can
result in an accident causing serious injury or
death.
4
Important Safety Information
Electric shock hazard:
Contact with live circuits can result in severe
injury or death.
Electric shock and fire hazard:
• Do not expose this unit to rain or moisture.
• Do not use the unit if it is wet or damaged.
• Inspect the accessory before use. It must be clean and dry, and the
insulation must be in good condition.
• Use this unit for the manufacturer’s intended purpose only, as
described in this manual. Any other use can impair the protection
provided by the unit.
Failure to observe these warnings can result in severe injury or death.
SM-100
5
Important Safety Information
• Do not attempt to repair this unit. It contains no user-serviceable
parts.
• Do not expose the unit to extremes in temperature or high humidity.
See Specifications.
Failure to observe these precautions can result in injury and can
damage the unit.
Using this unit near equipment that generates electromagnetic
interference can result in unstable or inaccurate readings.
• Do not operate with the case open.
• Before opening the case, shut off the unit.
Failure to observe this warning can result in severe injury or death.
6
Identification
1. Windscreen Recommended when wind speed exceeds
10 m/s (20 mph)
2. Microphone 1/2" electric condenser microphone
3. Display LCD
4. Function Switch See explanation under Features
5. Calibration Screw Calibration control can be adjusted clockwise
or counterclockwise to standard 94.0 dB
6. Tripod Mount 1/4–20 UNC thread (on back)
7. AC/DC Output Terminal See Specifications
8. Reset Button See explanation under Features
9. Response Switch See explanation under Features
10. Range Switch Selects a range (Lo or Hi), and turns power off
Display Icons
11. OVER The measured value is too high
or too low for the selected scale
12. MAX HOLD The Maximum Hold function
is enabled
13. dB Decibels (measurement unit
of sound pressure)
14. BT Battery low
dB
2
3
410
8
95
7
6
1
11
14
12 13
SM-100
7
Features
• Range Switch:
Lo for the lower measurement range (35 dB to 90 dB)
Hi for the higher measurement range (75 dB to 130 dB)
• Response Switch:
S (slow response time) for recording continuous sounds
F (fast response time) for capturing short bursts or intermittent noise
Max Hold for holding the maximum measured sound level on the display
• RESET: Press to reset the MAX HOLD function.
• Function (FUNCT) Switch
A-weighted scale (for common sounds)
C-weighted scale (for low-frequency sounds)
• Windscreen: Slide the windscreen over the end of the microphone to
reduce interference from wind. The windscreen is recommended when
wind speed exceeds 10 m/s (20 mph).
• Tripod Mount: Mount the unit to a tripod (purchased separately) for long-
term measurements.
Calibration Using Internal Oscillator
1. Make the following switch settings:
Range: Hi
Response: F
Function: CAL 94 dB
2. Adjust the calibration screw until the display reads 94.0 dB.
3. Annual recalibration is recommended.
Operation
1. Use the Range switch to select a measurement range (Lo or Hi).
2. Use the Response and Function switches to select the various options
(described under Features).
3. Read the display.
4. Turn the unit off.
8
Specifications
Display
Display Type: 4-digit LED
Sampling Rate: 20 per second
Display Period: 0.5 seconds
Measurement Ranges and Characteristics
Low: 35 dB to 90 dB
High: 75 dB to 130 dB
Dynamic Range: 55 dB
Frequency Range: 31.5 Hz to 8 kHz
Frequency Weighting:
A-weighted Scale: For common sounds (500 Hz to 8 kHz) such as human
voice, electric tools, telephone ringer, and door bell
C-weighted Scale: For low frequency sounds (31.5 Hz to 500 Hz) such as
fluorescent lights, transformers, and computer power supply fans
10
0
–10
–20
–30
–40
–50
–60
–70
–80
10 100 1000
Frequency—Hz
Response—dB
10000 100000
A-weighted
C-weighted
Response curve
per ANSI S1.4.
Solid portion
shows frequency
range of this
instrument.
Time Weighting:
Fast: 125 ms
Slow: 1 s
Accuracy: ±1.5 dB (under reference conditions)
Resolution: 0.1 dB
SM-100
9
Specifications (cont’d)
Measurement Output
AC Output Voltage: 0.65 VRMS at full scale
AC Output Impedance: 600 ohms (approximately)
DC Output Voltage: 10 mV per dB
DC Output Impedance: 100 ohms (approximately)
General
Operating Conditions: 0 °C to 40 °C (32 °F to 104 °F), 10 to 90% relative
humidity
Storage Conditions: –10 °C to 60 °C (14 °F to 140 °F), 10 to 75% relative
humidity; remove batteries
Elevation: 2000 m (6500') maximum
Maximum Hold: Reading decays < 1 dB per 3 minutes hold time.
Calibration Screw: Electrical calibration with internal oscillator
(1 kHz sine wave).
Battery: 9 V battery (NEDA 1604, JIS 006P or IEC 6F22)
DC Output
AC Output Signal Common
10
Maintenance
1. Turn the unit OFF.
2. Remove the battery compartment cover.
3. Replace the battery (observe polarity).
4. Replace the cover.
Cleaning
Periodically wipe the case with a damp cloth and mild detergent; do not use
abrasives or solvents.
• Do not attempt to repair this unit. It contains no user-serviceable
parts.
• Do not expose the unit to extremes in temperature or high humidity.
See Specifications.
Failure to observe these precautions can result in injury and can
damage the unit.
Before opening the case, shut off the unit.
Failure to observe this warning can result in severe injury or death.
Battery Replacement
Table of contents
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