Norsonic Nor103 Instruction Manual
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Norsonic Nor103 Instruction Manual

Sound level meter
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Nor103 is a small and versatile IEC Class 1 sound level meter. The combination
of a big graphical display and only three function buttons makes this sound level
meter easy to operate, even by a non-acoustician.
In addition to the current sound pressure level, it also measures and stores the
maximum level, the equivalent continuous sound level and the sound exposure
level with selected time and frequency weighting. With peak range selected,
C
may also be measured simultaneously.
peak
The instrument measures the basic acoustic figures that are widely used for
general noise measurements and reporting.
nor103
SOUND LEVEL METER
INSTRUCTION
MANUAL

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Summary of Contents for Norsonic Nor103

  • Page 1 INSTRUCTION MANUAL Nor103 is a small and versatile IEC Class 1 sound level meter. The combination of a big graphical display and only three function buttons makes this sound level meter easy to operate, even by a non-acoustician. In addition to the current sound pressure level, it also measures and stores the maximum level, the equivalent continuous sound level and the sound exposure level with selected time and frequency weighting.
  • Page 2 Every effort has been made to supply complete and accurate information. However, Norsonic AS assumes no responsibility for the use of – nor for the consequential damages of the use of – this informa- tion and/or the instrumentation described herein. Furthermore...
  • Page 3 Depending on your requirements and your familiarity with sound measurements as such, you may find that you use some parts of this manual often and others not at all. The very first chapter acquaints you with the Nor103 and describes its features and possibilities.
  • Page 4 Overview Precautions • Operate the unit only as described in this manual. • Do not drop the unit. Protect it from shocks and vibration. • The permissible environmental temperature range for operation of the unit is -10°C to +50°C. Relative humidity must be between 10% and 90%. •...
  • Page 5 Safety In this manual, important safety instructions are specially marked as shown below. To prevent the risk of death or injury to persons and severe damage to the unit or pe- ripheral equipment, make sure that all instructions are fully understood and observed. Important! Disregarding instructions printed here incurs the risk of damage to the product.

  • Page 7: Table Of Contents

    Contents Chapter 1 Introducing the sound level meter Nor103 ......1 Chapter 2 Taking a closer look at the instrument ........3 Chapter 3 Switch the instrument on and off ...........9 Chapter 4 Calibrating the instrument ............10 Chapter 5 Making a measurement ............13 Chapter 6 Memory handling ..............18...

  • Page 9: Introducing The Sound Level Meter Nor103

    Introducing the sound level meter Nor103 The sound level meter Nor103 is a class 1 sound level meter and complies with International standard for sound level meters IEC 61672-1. It is able to measure a number of acoustic parameters. The microphone is a 1/2-inch electret condenser microphone.
  • Page 10 During the measurement you have instant access to all measurement values. With the Nor103 you are able to do all kinds of basic noise measurements – community noise, industrial hygiene, product control and more.

  • Page 11: Taking A Closer Look At The Instrument

    Instruction Manual Taking a closer look at the instrument The Nor103 is delivered assembled and ready for use after installation of bateries. We recommend that the microphone is always mounted on the preamplifier as this will prevent dust and dirt to enter the insulator around the sensitive signal terminal on the microphone.
  • Page 12 Chapter 2 Taking a closer look at Nor103 Front panel overview Microphone Preamplifier MODE key START/STOP MODE A/C/CAL A/C/CAL/MENU key START/STOP key MENU POWER key POWER Microphone/preamplifier Microphone and preamplifier are integrated with the instrument. An extension cable cannot be used.
  • Page 13 Norsonic Nor103 Instruction Manual A/C/CAL/MENU This key selects the frequency weighting characteristics, calibration screens and recall screen. Pressing and holding this key in the measurement screen activates the menu screen/settings. Side view Strap mount DC out connector External connector AC out connector...
  • Page 14 Chapter 2 Taking a closer look at Nor103 Strap mount Attach the hand strap here. Pass your wrist through this strap when holding the unit when measuring. Rear view Tripod mounting thread Battery compartment Tripod mounting thread Mount the unit on a camera tripod with this thread.
  • Page 15 Norsonic Nor103 Instruction Manual Silicone cover The silicone cover protects the unit from shocks and also makes it easier to grip when held. Fit the cover to the unit with the windscreen removed, as shown in the following illustrations. Silicone cover strap mount NOTE! You cannot use external connector when the silicone cover is fitted.
  • Page 16 Chapter 2 Taking a closer look at Nor103 Connecting external equipment You can connect external equipment, such as a data recorder or level recorder, to the external connector. Connect as shown in the following diagram. External connector Data recorder DC out cable...

  • Page 17: Switch The Instrument On And Off

    Norsonic Nor103 Instruction Manual Switch the instrument on and off Press the POWER key in the lower right corner of the instrument to turn the power on. A second operation, hold for 0,5 seconds or more, will switch the instrument off.

  • Page 18: Chapter 4 Calibrating The Instrument

    250 Hz or 1 kHz. Carrying out the calibration According to IEC 61672-1, a class 1 sound calibrator like the Norsonic sound calibrator Nor1255 or Nor1256 should be used (Class 1 sound calibrator are defined by the International standard for sound calibrators: IEC 60942). This description is based on the use of a sound calibrator with a sound pressure level of 114 dB at 1 kHz.
  • Page 19 NOTE! Be aware of the fact that instruments using free-field microphones, like Nor103, shall normally be adjusted to a value slightly lower than the output level of the sound calibrator.
  • Page 20 Chapter 4 Calibrating the instrument The internal calibration The internal calibration activates an electronic oscillator substituting the microphone signal (1 kHz, sinusoidal wave). Such calibration is not according to the requirement in the standard for sound level meters IEC 61672-1, but is to be considered as a self-test. For adjusting the instrument with the built-in oscillator, you press the A/C/CAL key to switch to the internal calibration screen.

  • Page 21: Chapter 5 Making A Measurement

    Norsonic Nor103 Instruction Manual Making a measurement The instrument measures the instantaneous sound pressure level as soon as it is powered. During and after a measurement, additional functions for describing the level during the measurement is available like the maximum level and the average level.
  • Page 22 Chapter 5 Making a measurement Address number Each measurement is automatically given a sequence number called the address. Up to 199 measurements may be stored in the non-volatile memory. When a new measurement is started the address number is automatically increased. Battery indication The battery indication show the current condition of the batteries.
  • Page 23 Norsonic Nor103 Instruction Manual Measurement running The indicator flashes during an ongoing measurent. Measurement settings In the measurement screen, press and hold for 2 seconds the A/C/CAL key to switch to the menu screen/settings (not available during measurement). Range setting...
  • Page 24 Chapter 5 Making a measurement Setting time weighting characteristics Press the A/C/CAL key to proceed in the settings menu Press the START/STOP key or the MODE key to select the following settings. Flashes every seconds F (fast), S (slow) Setting measurement time Press the A/C/CAL key to proceed in the settings menu Flashes every 0.5 seconds...
  • Page 25 Norsonic Nor103 Instruction Manual Storing measurement results When the measurement stops, the measured results( L , or L ) are Cpeak automatically stored, in the next available address number. Resume after power off When the instrument is turned on, the following parameters maintain the same settings they had before you turned the unit off: •...

  • Page 26: Chapter 6 Memory Handling

    Chapter 6 Memory handling Memory handling Recalling stored data Press the A/C/CAL key until the Recall screen appears. The most recent result is au- tomatically selected. The display will look similar as shown on the figure, with Recall written in the upper right corner.
  • Page 27 Norsonic Nor103 Instruction Manual Clearing stored data Press the A/C/CAL key for 3 or more seconds while the recall screen is shown and a screen asking you to confirm clearing of the data appears. ALL and CLr flash alternately on the screen every 0.5...

  • Page 28: Chapter 7 Batteries

    Chapter 7 Batteries Batteries Inserting or changing batteries Important! Make sure the unit is turned off before removing old batteries. Remove the battery compartment cover on the rear of the unit. Press and pull in the direction indicated by the arrow. Take out eventual old batteries an insert two new, size AAA (IEC R03, LR03) batteries into the battery compartment.
  • Page 29 Norsonic Nor103 Instruction Manual Battery life (at 23°C, using wide range) Manganese batteries: approx. 3 hours Alkaline batteries: approx. 7 hours Battery life will be reduced by 20% when a DC output cable is connected. Full charge Indicator flashing (replace the batteries)

  • Page 30: Chapter 8 Measuring Sound

    Chapter 8 Measuring sound Measuring sound What is sound Sound is the mechanical vibration of a gaseous, liquid or solid elastic medium through which energy is transferred away from the source by sound waves. This is the strict physical definition of sound. More generally we restrict the term sound to be pressure variations which can be detected by the human ear.
  • Page 31 Norsonic Nor103 Instruction Manual Decibel means the tenth of a bel, the unit named after Alexander Graham Bell, inventor of the telephone. Mathematically, the sound level in dB is defined by: § · ¨ ¸ ˜ ¨ ¸ © ¹...
  • Page 32 Chapter 8 Measuring sound By converting sound pressure in pascals to levels in decibels, a scale spanning no less than 1 : 10 000 000 is conveniently reduced to a level between 0 dB to 140 dB. See the graph above indicating typical sound pressure levels for “everyday” incidents. Note that the dB-values can not be added together like masses given in kg.
  • Page 33 Norsonic Nor103 Instruction Manual Maximum levels The levels with time weighting F or S vary during the measurement period. The maxi- mum of the observed values is displayed by placing “max” below the level sign. Equivalent continuous sound level Equivalent continuous sound level is also called time-averaged sound level. The weig- ting gives equal emphasis to the sound from the start to the end of the measurement period.

  • Page 34: Chapter 9 Technical Specifications

    JIS C 1509-1 class 1 JIS C 1516 class 1 CE marking WEEE Directive Normal configuration Sound level meter Nor103 with microphone UC-59; With or without windscreen Nor4617 with fall-out preventer; With or without silicone cover; Powered from internal batteries;...
  • Page 35 Norsonic Nor103 Instruction Manual Measurement level range (1 kHz) Wide range: A weighting: 30 dB to 137 dB C weighting: 36 dB to 137 dB Peak range: A weighting: 65 dB to 137 dB C weighting: 65 dB to 137 dB...
  • Page 36 Chapter 9 Technical specifications Display update rate 1 second Calibration: Acoustic calibration using Nor1255 or similar Calibration frequency: 1 kHz Calibration sound pressure level: 114 dB (Adjust to 113,8 dB). Electronic verification using an internal electronic signal (94 dB). Windscreen Conforms to IEC 61672-1 Class 1 with and without the windscreen attached.
  • Page 37 Norsonic Nor103 Instruction Manual AC out connector (optional – not a part of normal configuration) AC output: +600 mVrms 1 Vrms (at 110 dB) -400 mVrms (Upper limit: 1.8 Vrms) Overload: +2 dB Output impedance: 600 Ω Load impedance: 10 kΩ or more...
  • Page 38 Dummy-microphone Nor1447 Reference incidence direction and reference point position Sound level meter Nor103 is designed for measuring the sound pressure level in free- field sound conditions. Reference point is the center of diaphragm of the microphone. The reference axis is along the symmetry axis of the microphone.
  • Page 39 Norsonic Nor103 Instruction Manual Dimensional drawings 63 mm 23,5 mm Front view Right side View Left side view Rear view...
  • Page 40 Chapter 9 Technical specifications Table for level corrections Nominal Exact Microphone UC-59 Case reflections Windscreen frequency frequency Typical Exp. Exp. Exp. Free-field/ Deviations Deviation Response uncert. uncert. uncert. actuator (dB) (dB) (dB) (dB) (dB) (dB) 0,00 0,00 0,05 0,00 0,05 0,00 0,05 0,00...
  • Page 41 Norsonic Nor103 Instruction Manual Nominal Exact Microphone UC-59 Case reflections Windscreen frequency frequency Typical Exp. Exp. Exp. Free-field/ Deviations Deviation Response uncert. uncert. uncert. actuator (dB) (dB) (dB) (dB) (dB) (dB) 4467 0,08 1,19 0,10 0,49 0,10 0,34 0,20 4732...
  • Page 42 Chapter 9 Technical specifications Microphone free-field to actuator correction: Correction to be added to the microphone response measured with an electrostatic actuator (IEC 61094-6) in order to obtain the free-field response for the microphone system. The corresponding expanded uncertainty (95%) includes the typical varia- tions between different microphones of the same model.
  • Page 43 Norsonic Nor103 Instruction Manual Frequency Response The frequency response of a free-field field microphone is expressed as the frequency response in the reference direction (0º incidence). The diagram below shows a typical example for the frequency response of the microphone UC-59.
  • Page 44 Chapter 9 Technical specifications Effect of Windscreen Nor4617 The windscreen Nor4617 reduces measurement errors due to wind noise. The Nor4617 characteristics are shown below. Frequency weighting A Nor103 Nor103 With Nor4617 Wind velocity (m/s) Frequency weighting C Nor103 With Nor4617...
  • Page 45 Norsonic Nor103 Instruction Manual -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 1 000 10 000 100 000 Frequency (Hz) Influence of windscreen Nor4617 on acoustic performance of Nor103 (Referenced to Nor103 characteristics)
  • Page 46 The greatest susceptibility configuration for radio frequency fields START/STOP MODE A/C/CAL MENU POWER Nor103 Polarization direction is parallel to drawing plane Antenna Operation mode: normal operation The greatest susceptibility configuration for radio frequency fields Statement of conforming to the basic statement Tab.
  • Page 47 Norsonic Nor103 Instruction Manual The lower and upper limits of the linear operating range Tab. 2 The lower and upper limits of the linear operating range A-weighting Sound level (dB) Frequency (Hz) 31.5 12.5 K Upper 97.0 137.0 136.0 133.0 130.0...
  • Page 48 Chapter 9 Technical specifications Directional Characteristics The directional characteristics of Nor103 is a measure of its sensitivity for sound waves arriving from different angles. Ideally, the microphone is equally sensitive in all directions. However, at higher frequencies diffraction and case re- flections cause the sensitivity to vary with the direction of the incident sound.
  • Page 49 Norsonic Nor103 Instruction Manual Random incidence response...
  • Page 50 Chapter 9 Technical specifications...
  • Page 51 Tel: +47 3285 8900 info@norsonic.com www.norsonic.com Declaration of Conformity We, Norsonic AS, Gunnersbråtan 2, N-3409 Tranby, Norway, declare under our sole responsibility that the product: Sound Level Meter Nor103 to which this declaration relates, is in conformity with the following standards or...
  • Page 52 Norsonic AS supplies a complete range of instrumentation for acoustics – from sound calibrators, microphones and Gunnersbråtan 2 preamplifiers; via small handheld sound level meters to N-3409 Lierskogen advanced, yet portable, real time analysers, but also spec- Norway Tel: +47 3285 8900 trum shapers, building acoustics analysers and complete info@norsonic.com...

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