RS PRO SLM 1353M Instruction Manual
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RS PRO SLM 1353M Instruction Manual

Integrating sound level meter
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INSTRUCTION MANUAL
SLM 1353M
Integrating Sound Level Meter
EN
FR
DE
IT
ES
A/C
Leq SEL SPL
MAX
RECORD
ERASE
DATE
TIME
INTEG
TIME

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Summary of Contents for RS PRO SLM 1353M

  • Page 1 INSTRUCTION MANUAL SLM 1353M Integrating Sound Level Meter Leq SEL SPL RECORD ERASE DATE TIME INTEG TIME...

  • Page 2: Table Of Contents

    Integrating Sound Level Meter / EN CONTENTS Title Page 1. INSTRUMENT CARE ..................1 2. FEATURES ..................... 2 3. MEASUREMENT PARAMETERS..............3 4. SPECIFICATIONS ..................4 5. CONTROLS AND FUNCTIONS ..............11 6. LCD DISPLAY DESCRIPTION..............14 7. PREPARATION FOR USE ................16 8.

  • Page 3: Instrument Care

    Integrating Sound Level Meter / EN 1. INSTRUMENT CARE Do not attempt to remove the mesh cover from the microphone as this will cause damage and affect the accuracy of the instrument. Protect the instrument from impact. Do not drop it or subject it to rough handling. Transport it in the supplied carrying case.

  • Page 4: Features

    Integrating Sound Level Meter / EN 2. FEATURES The SLM 1353M Sound Level Meter complies with the requirements of IEC 61672-1: 2003 standard for a Class 2 instrument. The instrument contains several features which permit sound level measurements under a variety of conditions.

  • Page 5: Measurement Parameters

    Integrating Sound Level Meter / EN 3. MEASUREMENT PARAMETERS The following parameters are used on the instrument. A → “A” frequency weighting sound pressure level C → “C” frequency weighting sound pressure level FAST → Fast time weighting SLOW → Slow time weighting IMP →...

  • Page 6: Specifications

    Integrating Sound Level Meter / EN 4. SPECIFICATIONS Specifications apply to Model SLM 1353M fitted with Microphone model MC-22 and Microphone Preamplifier model AP-21 Applicable standards: IEC61672-1: 2003 Class 2 IEC60651: 1979 Type 2 ANSI S1.4: 1983 Type 2 IEC60804: 1985 Type 2 Measurement functions: •...
  • Page 7 Integrating Sound Level Meter / EN Linearity operating range: A-weighted, 1000Hz, 60dB dynamic range. Total linear operating range: In accordance with IEC 61672-1, A-weighted, 1000Hz: 30dB to 130dB. Level range selection: 5 ranges in 10dB steps 30 to 90dB , 40 to 100dB 50 to 110dB , 60 to 120dB 70 to 130dB LINEAR OPERATING RANGES (L.O.R.)
  • Page 8 Integrating Sound Level Meter / EN RANGE: 60 – 120 dB. Test starting point 94 dB for all weightings and frequencies except 31.5Hz A-weighted, for which the starting point is 74 dB. FREQUENCY L.O.R. L.O.R. WEIGHTING WEIGHTING 31.5 60.0 – 80.6 60.0 –...
  • Page 9 Integrating Sound Level Meter / EN • Frequency for acoustic testing: 8000Hz. • Warm-up time: ≦ 2min • Sampling interval: Bar graph indication → 125 ms approx. Numeric indication → 1 sec approx. • Data record capacity: Data can be stored in the memory. Max.
  • Page 10 Integrating Sound Level Meter / EN (dB) 20.0 10.0 -10.0 -20.0 31.5Hz 63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz Freq 31.5 1000 2000 4000 8000 units +1.2 +0.7 +0.4 +0.2 +0.1 -3.7 Typical diffuse-field response for random incidence Preamplifier: •...
  • Page 11 Integrating Sound Level Meter / EN • Warning indications: Out-of-range indications: OVER displayed at upper limit of the range UNDER displayed at lower limit of the range Outputs • AC output (using selected frequency weighting) Output voltage: 2Vrms (at full-scale of the range) Output impedance: 5kΩ...
  • Page 12 Integrating Sound Level Meter / EN Compliance with standards: • indicates compliance with applicable European Union Directives. • EMC Emission: IEC 61000-6-3, Generic emission standard for residential, commercial and light industrial environments. No significant emissions from the instrument. IEC 61672-1, Instrumentation standard classification group X and performance class 2 sound level meter.

  • Page 13: Controls And Functions

    Integrating Sound Level Meter / EN 5. CONTROLS AND FUNCTIONS Microphone and preamplifier: The MC-22 microphone capsule is connected to the AP-21 preamplifier for normal operation. The microphone capsule may be carefully removed from the preamplifier and substituted with the appropriate electrical impedance (See sect.
  • Page 14 Integrating Sound Level Meter / EN button : Press this button the following parameters are monitored during integrating measurement and can be viewed selectively : Leq with integrating start time. SEL with integrating stop time. SPL MAX Maximum sound level with time. SPL MIN Minimum sound level with time.
  • Page 15 Integrating Sound Level Meter / EN button : Data records mode : Press this button enter to data records mode. Erase all records : Turn off the meter, press and hold down this button then turn on the meter, until the “CLr” indication is shown on the display. button : Press this button, will change displayed from “hour : minute : second”...

  • Page 16: Lcd Display Description

    Integrating Sound Level Meter / EN 6. LCD DISPLAY DESCRIPTION Sound level range indicator (5 ranges): 30–90dB, 40–100dB, 50–110dB, 60–120dB and 70–130dB 2. Bar graph shows the current sound level (1dB resolution). 3. Current date/time and elapsed time indicator : During integrating this indicator shows the elapsed time in seconds.
  • Page 17 Integrating Sound Level Meter / EN MIN: Minimum sound level reading. 10. REC : Data records indicator 11. Sound level reading (0.1dB resolution): 30.0 – 130.0dB 12. FULL: Data records full indicator 13. dB: Sound level unit 14. A, C: “A” Frequency weighting or “C” Frequency weighting indicator. 15.

  • Page 18: Preparation For Use

    Integrating Sound Level Meter / EN 7. PREPARATION FOR USE Power Supply The instrument can be powered by internal batteries, or for extended operation by an optional external 6V DC supply such as a suitable AC mains adapter or battery pack. Rechargeable batteries may be used in the instrument, but cannot be recharged when fitted as the instrument is not designed to recharge batteries.
  • Page 19 Integrating Sound Level Meter / EN 3. Windscreen When making measurements outdoors in strong winds or when measuring air conditioning equipment or similar, wind noise and strong air movements at the microphone can cause measurement errors. Such effect can be reduced by using the windscreen.

  • Page 20: Calibration Procedure

    Integrating Sound Level Meter / EN 8. CALIBRATION PROCEDURE Most national standards recommend that you calibrate your sound level meter before each set of measurements and check the calibration after each set. The procedure to check/adjust the displayed sound level in response to acoustic calibrator types SLC 1356 or B&K 4231 (or equivalent) is as follows: 1.

  • Page 21: Measurement Procedure

    Integrating Sound Level Meter / EN 9. MEASUREMENT PROCEDURE 9-1 Sound level measurement 1. Press the button to turn on the instrument. The initial state depends on the condition the instrument was in before it was last turned off. 2. Press the “ ”...
  • Page 22 Integrating Sound Level Meter / EN 1. Press button turn on the meter. 2. Press button to select desired frequency weighting. For normal measurements, select the “A” setting. 3. Press button to select desired time weighting. Normally, the “FAST” setting should be used.
  • Page 23 Integrating Sound Level Meter / EN When wishing to terminate the measurement earlier, press button, the pause symbol “ ” is shown. If an under-range condition or over-range condition occurs at least once during measurement, the “OVER” or “UNDER” indicator appears, to shown that the processing data contain over-range or under-range data.

  • Page 24: Setting The Current Time And Date

    Integrating Sound Level Meter / EN 10. SETTING THE CURRENT TIME AND DATE Date and time information is stored with each record block. Therefore, it is important to make sure that this information is correct. 1. Press button turn off the meter. 2.

  • Page 25: Store Record Data Operation

    Integrating Sound Level Meter / EN 11. STORE RECORD DATA OPERATION The meter incorporates a memory which can be used to store measurement data. The maximum has 32000 data capacity can be split up to 255 block records. It has two methods, with preset start time or without, to record data. 11-1 Setting the record sampling interval time.
  • Page 26 Integrating Sound Level Meter / EN 3. Press buttons to select desired level range. Choose a setting in which the bar graph indication registers to about the middle of the range. If the “OVER” or “UNDER” indicators light up frequently, change the level range setting. 11-4 Record data A.
  • Page 27 Integrating Sound Level Meter / EN If “OVER” is flashing shown, the sound level data used for processing contained over-range data. If “UNDER” is flashing shown, the sound level data used for processing contained under-range data. It is also possible to use the button during measurement to read the Leg, SEL, SPL MAX, SPL MIN, PH (Peak Hold), L05, L10, L50, L90, L95 and SPL sound level up to that point.
  • Page 28 Integrating Sound Level Meter / EN 6. Press button to store the preset start date and time, and exit this mode, the “ ” and “ ”symbols will flash until the start time is reach. 7. When the preset start time is reached, the data starts recording automatically, the start symbol “...
  • Page 29 Integrating Sound Level Meter / EN 10. After the measurement terminates automatically, press button for 2 seconds to exit integrating sound level measurement, the terminate symbol “ ” disappears and the recorded block number (1 to 255) will display. 11. In the pause mode, press the button for 2 seconds, the recorded block number (1 to 255) will display once and exit the record mode, the pause symbol “...

  • Page 30: Output Connectors

    Integrating Sound Level Meter / EN 12. OUTPUT CONNECTORS 12-1 AC Output: An AC signal corresponding to the frequency-weighted signal is available at this connector. Output voltage: 2Vrms±100mVrms (scale upper limit) Output impedance: approx. 5kΩ Load impedance: ≧ 1MΩ The output voltage when the instrument is in calibration mode (-6dB from scale upper limit, 1000Hz sine wave) is 0.5Vrms.

  • Page 31: Adjustment Data For Calibrator (B&K Type 4226 Pressure Mode)

    Integrating Sound Level Meter / EN 13. ADJUSTMENT DATA FOR CALIBRATOR (B&K TYPE 4226 PRESSURE MODE) Freq 31.5 1000 2000 4000 8000 units +0.2 +0.3 +0.1 -0.1 -0.2 -0.1 +1.2 +3.9 08/15/16 Version No. 01...

  • Page 32: Typical Instrument Frequency Response At 0° Incidence

    Integrating Sound Level Meter / EN 14. TYPICAL INSTRUMENT FREQUENCY RESPONSE AT 0° INCIDENCE Freq 31.5 units 0deg Freq 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 units 0deg -0.3 08/15/16 Version No. 01...

  • Page 33: Typical Frequency Response Due To Case Reflections At 0° Incidence

    Reflections -0.1 -0.4 -1.3 -1.0 in dB Absolute effect at 1000Hz = 0.0 dB Case reflections for an SLM 1353M meter fitted with an MC-22 microphone as per IEC 61672-1 and IEC 60651, relative to 1000Hz. 08/15/16 Version No. 01...

  • Page 34: Typical Frequency Response For Instrument Fitted With Windscreen At 0° Incidence

    -0.1 in dB Absolute effect at 1000Hz = +0.2 dB Frequency response effects for a 65mm dia. windshield fitted to an SLM 1353M meter fitted with an MC-22 microphone as per IEC 61672-1 and IEC 60651, relative to 1000Hz 08/15/16 Version No. 01...

  • Page 35: Directional Characteristics Of The Complete Instrument

    Integrating Sound Level Meter / EN 17. DIRECTIONAL CHARACTERISTICS OF THE COMPLETE INSTRUMENT The directional characteristics of a microphone give a measure of its differing sensitivity for sound waves arriving from various angles. Since the pre-polarized condenser microphone used in the instrument is a pressure-sensitive type, it should be equally sensitive in all directions.
  • Page 36 Integrating Sound Level Meter / EN Directional characteristics for frequency equal to 2000Hz Directional characteristics for frequency equal to 4000Hz 08/15/16 Version No. 01...
  • Page 37 Integrating Sound Level Meter / EN Directional characteristics for frequency equal to 8000Hz 08/15/16 Version No. 01...

  • Page 38: Appendix A Frequency Weighting Network

    Integrating Sound Level Meter / EN 18. APPENDIX A FREQUENCY WEIGHTING NETWORK The SLM 1353M provides frequency weightings A, and C. The electrical characteristics of the weighting network at AC output connector are as shown below. The human perception of a sound depends not only on the sound pressure level, but also on the frequency.

  • Page 39: Appendix B Rms Detection Circuit And Time Weighting

    Integrating Sound Level Meter / EN 19. APPENDIX B RMS DETECTION CIRCUIT AND TIME WEIGHTING The sound level meter uses rms detection. The effective value E (rms) is defined by the following equation. ∫ The voltage e which changes over time is raised to the power of 2, and integration for the time interval T is performed.
  • Page 40 Integrating Sound Level Meter / EN The response of the index averaging circuit to a single burst signal is shown below. = C R ：Input voltage ：Output voltage Equivalent electrical circuit : Input voltage (proportional to square of sound pressure) : Output voltage e: Logarithm base τ: Time constant...

  • Page 41: Appendix C Influence Of Background Noise

    Integrating Sound Level Meter / EN 20. APPENDIX C INFLUENCE OF BACKGROUND NOISE When measuring a certain sound in a certain location, all other sounds present at that location except the measurement target sound are background noise (also called ambient noise or dark noise). Since the sound level meter will display the combination of target sound and background noise, the amount of background noise must be taken into consideration when determining the level of the target sound.

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