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Tursdale Technical Services Ltd Unit N12B Tursdale Business Park Co. Durham DH6 5PG United Kingdom Phone: +44 ( 0 ) 191 377 3398 Fax: +44 ( 0 ) 191 377 3357 [email protected] http://www.industrial-needs.com/
Manual Sound level meter
PCE DSA 50
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Manual ..................................................................................................................................... 1 Sound level meter .................................................................................................................... 1 PCE DSA 50 ............................................................................................................................ 1 1. FEATURES OF THE INSTRUMENT ................................................................................... 4
1.1. Accessories .................................................................................................................................. 4 1.2. Weatherproof accessories set for microphone ............................................................................. 5 1.3. System configuration ................................................................................................................... 6 1.4. Measured quantities ..................................................................................................................... 7 1.4.1. Sound level meter (SLM) mode ............................................................................................... 7 1.4.2. 1/1-octave analyzer mode ........................................................................................................ 7 1.4.3. 1/3-octave analyzer mode ........................................................................................................ 8 1.4.4. Infra G filter mode ................................................................................................................... 8 1.5. Specifications ............................................................................................................................... 8 1.5.1. Specifications for SLM mode ............................................................................................ 12 1.5.2 1/1-octave analyzer mode ........................................................................................................ 14 1.5.2. 1/3-octave analyzer mode .................................................................................................. 16 1.5.3. Infra G filter mode ............................................................................................................. 20 1.6. Influence of operating environment ........................................................................................... 21 1.7. Influence of instrument accessories ........................................................................................... 21
2. CONTROLLING OF THE INSTRUMENT ......................................................................... 24 2.1. Control keys ............................................................................................................................... 24 2.2. Input and output connectors of the instrument ........................................................................... 25 2.3. Default instrument settings .................................................................................................... 27 2.4. Preparation of the instrument to operation ................................................................................. 27
3 . OPERATION .............................................................................................................. 28 3.1. Instrument data plate .................................................................................................................. 28 3.2. SETUP menu ............................................................................................................................. 29 3.3. RESULTS menu ........................................................................................................................ 30 3.3.1. SLM mode ............................................................................................................................. 31 3.3.2. 1/1-octave analyzer ................................................................................................................ 32 3.3.3. 1/3-octave analyzer mode ...................................................................................................... 33 3.3.4. Infra G filter mode ................................................................................................................. 34 3.4. SETUP TIME menu ................................................................................................................... 35 3.5. FILTER menu ............................................................................................................................ 36 3.6. MEMORY menu ....................................................................................................................... 37 3.6.1. Save measure ......................................................................................................................... 37 3.6.2. Load measure ......................................................................................................................... 38 3.6.3. Measurement history .............................................................................................................. 38 3.6.3.1. SLM mode ........................................................................................................................... 39 3.6.3.2. 1/1-octave analyzer mode .................................................................................................... 40 3.6.3.3. 1/3-octave analyzer mode .................................................................................................... 41 3.6.3.4. Infra G filter mode ............................................................................................................... 41 3.6.4. FREE/OCCUPIED menu ....................................................................................................... 42 3.7. CLEAR menu ............................................................................................................................ 42 3.7.1. Measure in memory ............................................................................................................... 43 3.7.2. Measurement history .............................................................................................................. 43 3.7.3. Entire memory ....................................................................................................................... 44
4 . COMMUNICATION WITH COMPUTER ............................................................. 44 5.1. Recommendations for correct performing of measurements ..................................................... 45
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5.2. Internal battery ........................................................................................................................... 45 5.3. Calibration of the instrument ..................................................................................................... 45 5.4. Warranty .................................................................................................................................... 46 5.4.1. Complaint instructions for the purchaser: .............................................................................. 46 5.5. Maintenance and repair .............................................................................................................. 47
6. CE MARKING AND CONFORMANCE TO EU COUNCIL DIRECTIVES ....................... 47 Appendix A. Filter characteristics ...................................................................................... 47 Appendix B. Directional responses ................................................................................... 51 Appendix C. Sensitivity to vibration ................................................................................... 53
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1. FEATURES OF THE INSTRUMENT Digital sound analyzer model DSA-50 is the instrument combining the features of integrating sound level meter as well as 1/1- and 1/3-octave band frequency analyzer. The majority of quantities characterizing occupational, environmental and other kinds of acoustic noise can be measured by this Class 1 digital-signal-processing instrument. DSA-50 is designed to be capable to perform long-lasting measurements without need of battery recharging. Internal battery allows for at least 24h continuous operation of the instrument provided microphone heating is turned off. External battery or mains adaptor may be also used. The instrument is equipped with USB 1.1 interface to enable bi-directional communication with PC.
1.1. Accessories Basic accessories: Model 5014 external power supply (Mascot). Instruction Manual. Declaration of Conformity. Warranty Card. Certificate of Verification. OP 1/2 microphone windscreen. Carrying case. 1.8 m USB interface cable. DSA-50 computer software for instrument remote operation (PC under MS Windows 98SE/ME/2000/XP required).
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DSA Monitor computer software for data display, readout and analysis (PC under MS Windows 98SE/ME/2000/XP required). Additional accessories: Built-in microphone heating system. Watertight carrying case. KA-50 sound calibrator. CV-06 external supply source together with 8614 power supply (Mascot). Weatherproof accessories set for microphone. Microphone extension cable PD5Lx (x stands for cable length, max. 6 m). Microphone extension cable PD7Lx (x stands for cable length, max. 6 m). Supporting stand for microphone: SM2 (2 m height) and SM4 (4 m height). Supporting stand for the instrument: SMR (1.5 m height). 1.2. Weatherproof accessories set for microphone This set enables to convert WK-21 microphone into WK-21WP weatherproof microphone. It consists of: weatherproof version of microphone protecting grid, model SM, rain cover, model OK, windscreen with anti-bird spikes, model TOP, microphone holder. To assemble weatherproof microphone proceed as follows:
Fasten the part (2) of microphone holder to microphone extension cable PD7Lx and next connect this cable to microphone-preamplifier assembly (1) (see Fig. 1.2).
Put part (3) of microphone holder on microphone-preamplifier assembly (1) and then screw it to part (2) of microphone holder fastened earlier to extension cable (see Fig. 1.2). Remove standard protecting grid (4) from WK-21 (see Fig. 1.3). WARNING! During this and next action particular care should be observed as the microphone diaphragm is exposed after protection grid removing and may be easily damaged! Screw SM weatherproof protecting grid (5) to the microphone (see Fig. 1.4). Put OK rain cover (6) on the microphone (see Fig. 1.4). Put TOP windscreen with anti-bird spikes (7) on the microphone assembled as above (see Fig. 1.5) until the windscreen reaches microphone holder. Fig. 1.6 shows completely assembled weatherproof microphone WK-21WP.
1 3
6
Fig. 1.2. Assembling of weatherproof accessories – step 1.
1 4 Fig. 1.3. Assembling of weatherproof accessories – step 2. 6 5 Fig. 1.4. Assembling of weatherproof accessories – step 3. 7 Fig. 1.5. Assembling of weatherproof accessories – step 4. Fig. 1.6. Completely assembled weatherproof microphone WK-21WP.
1.3. System configuration Basic configuration: DSA-50 digital sound analyzer (manufacturer: SONOPAN). PW21LG ½” microphone preamplifier (manufacturer: SONOPAN). WK-21 ½” measurement microphone (manufacturer: SONOPAN). Other accessories specified in chapter 1.1 are optional.
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1.4. Measured quantities Many quantities used to characterize acoustic noise can be measured simultaneously using DSA-50 digital sound analyzer. The set of measured quantities depends on instrument operating mode. Measurement duration and battery condition information is displayed at every operating mode.
1.4.1. Sound level meter (SLM) mode For two frequency weightings, selected among from three ones: A, C and Z available in the instrument, following quantities can be measured simultaneously (in symbols listed below X stands for selected frequency weighting):
LXF current RMS, F-time-weighted sound level, LXFmn minimum RMS, F-time-weighted sound level, LXFmx maximum RMS, F-time-weighted sound level, LXS current RMS, S-time-weighted sound level, LXSmn minimum RMS, S-time-weighted sound level, LXSmx maximum RMS, S-time-weighted sound level, LXI current RMS, I-time-weighted sound level, LXImn minimum RMS, I-time-weighted sound level, LXImx maximum RMS, I-time-weighted sound level, LXPk current peak sound level, LXMPk maximum peak sound level, LXeq time-average (equivalent continuous) sound LXeq1s time-average sound level for last one second.
If A frequency weighting is one of two selected weightings, then following quantities are measured additionally for this weighting:
LAE sound exposure level, LAEX,T noise exposure level referred to specified exposure
1.4.2. 1/1-octave analyzer mode 1/1-octave analyzer contains nine digital octave-band filters having exact centre frequencies specified for binary octave ratio. Nominal centre frequencies are 31.5Hz, 63Hz, 125Hz, 250Hz,500Hz, 1kHz, 2kHz, 4kHz and 8kHz. Specifications of filters conform to Class 1 requirements of EN 61260:1995 and EN 61260:1995/A1:2001. Following quantities can be measured simultaneously for each filter centre frequency (and also for wide-band response), when one frequency weighting is selected among from three available weightings (A, C and Z):
LF current RMS, F-time-weighted sound level, LS current RMS, S-time-weighted sound level, Leq time-average sound level.
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If A frequency weighting is selected, then following quantities are measured additionally:
LASmx maximum RMS, A-frequency-weighted, S-time-weighted sound l l LAeq time-average A-frequency-weighted sound level,
LCMPk maximum peak C sound level.
1.4.3. 1/3-octave analyzer mode 1/3-octave analyzer contains twenty nine digital 1/3-octave band filters having exact centre frequencies specified for binary octave ratio. Nominal centre frequencies are 25Hz, 31.5Hz, 40Hz,50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1kHz, 1.25kHz, 1.6kHz, 2kHz, 2.5kHz, 3.15kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz, 12.5kHz and 16kHz. Specifications of filters conform to Class 1 requirements of EN 61260:1995 and EN 61260:1995/A1:2001. Following quantities can be measured simultaneously for each filter centre frequency (and also for wide-band response), when one frequency weighting is selected among from three available weightings (A, C and Z) and when one time weighting is selected among from two available weightings (F and S):
L current RMS sound level, Leq time-average sound level.
1.4.4. Infra G filter mode Following quantities can be measured simultaneously:
LGS current RMS, G-frequency-weighted S-time-weighted sound level, LGSmn minimum RMS, G-frequency-weighted S-time-weighted sound LGSmx maximum RMS, G-frequency-weighted S-time-weighted sound LIPk current peak sound level in infrasound band, LIMPk maximum peak sound level in infrasound band, LGeq G-frequency-weighted time-average sound level.
1.5. Specifications DSA-50 digital sound analyzer conforms to requirements of following standards:
& EN 61672-1:2002 Electroacoustics – Sound level meters – Part 1: Specifications.
& EN 61260:1995/A1:2001 Electroacoustics – Octave-band and fractional-octave- band filters.
& ISO 7196:1995 Acoustics – Frequency-weighting characteristic for infrasound measurements.
DSA-50 conforms to electromagnetic compatibility (EMC) requirements specified in EN 61672-1:2002 for X group instruments.
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Accuracy class 1 Readout resolution 0.1dB Maximum sound pressure level can be applied without causing damage to the instrument 150dB (3%
THD) Maximum electrical voltage can be applied at instrument electrical input facility without damage to the instrument 22Vp-p Capacitance of electrical input facility 18pF Reference conditions: - type of sound field free field - reference frequency 1000Hz - reference sound pressure level 94dB - reference level range:
° for 1/1- and 1/3-octave analyzer mode 65 –° for infra G filter mode 65 –
Specifications common for all operating modes: ° for SLM mode 55 – 135dB - sampling frequency: ° for SLM, 1/1- octave and 1/3-octave mode 52.1kHz ° for infra G filter mode 17.4kHz
- Microphone reference direction microphone symmetry axis - microphone reference point microphone diaphragm centre - reference orientation sound wave arriving from reference direction- reference temperature +23°C- reference humidity 50% RH- reference static pressure 101.325kPaPermissible error for sinusoidal reference signal (progressive sound wave incident
di l l
to microphone diaphragm, 94dB, 1000Hz) 0.7dB Operating temperature range -10 +50°CStorage temperature range -10 +50 °C Operating humidity range 90% RH (no
)Operating static pressure range 65 108kPa Electromagnetic emission within the limits specified in EN 61672-1:2002 (maximum emission when operating external power supply) Warm-up time:
- after turn-on 1 minute - after environmental conditions change 15 minutes
Measurement duration 99h 59m 58s (set with 1s or infinite))Serial communication interface USB 1.1
Dimensions (without microphone) 237 x 84 x 50 mm Power supply
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Fig. 1.7. Free-field correction for WK-21 microphone (0° incidence).
Table below and Fig. 1.8 show typical free-field frequency response of WK-21 microphone (relative to its sensitivity at 250Hz) together with maximum permissible deviations as specified in EN 61094-4:1995.
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Fig. 1.8. Typical free-field frequency response of WK-21 microphone.
1.5.1. Specifications for SLM mode
Frequency weightings A, C, Z AC electrical output (sine, 1000 Hz) - weighted frequency response A, Z - FSD output voltage for level range 14Vp-p - maximum output voltage 22Vp-p - output impedance 1kΩ - load impedance 10kΩ Time weightings SLOW, FAST, IMPULSE
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Starting level for level linearity testing reference sound pressure reference level range Maximum unweighted sound pressure level not activating overload indication See table below
Total range for LA sound level and LAeq time-average sound level 18 –
13 dBA Total range for LCPk peak sound level 40 – Extents of measurement range at specified signal frequency, level range and
frequency weighting: - for sound level (L) and time-average sound level (Leq)
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- for peak level (LPk)
WARNING! The extents of measurement range for peak level at A and Z frequency weightings are determined for continuous 1000Hz sine signal; measurement error extended by expanded measurement uncertainty is less than 1.1 dB. Self-generated noise - measured with electrical input facility installed: ° at A frequency weighting 13dB ° at C frequency weighting 19dB ° at Z frequency weighting 25dB - measured with WK-21 microphone installed:
° at A frequency weighting 19dB ° at C frequency weighting 24dB ° at Z frequency weighting 27dB
1.5.2 1/1-octave analyzer mode
Frequency weightings A, C, Z AC electrical output (sine, 1000 Hz) - weighted frequency response A, Z - FSD output voltage for level range 14Vp-p - maximum output voltage 22Vp-p - output impedance 1kΩ - load impedance 10kΩ Time weightings SLOW, FAST
Extents of measurement range at specified level range and frequency weighting, for time-weighted sound level L and time-average sound level Leq (analyzer):
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Extents of measurement range at specified octave bands and at most-sensitive level range (5 – 75dB), for time-weighted sound level L and time-average sound level Leq (analyzer):
Extent of measurement range for LASmx maximum sound level and LAeq time-average sound level (criterion values 17 – 135dB Extents of measurement range for LCPk peak sound level (criterion values)
Self-generated noise - measured with electrical input facility installed
- measured with WK-21 microphone installed
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1.5.2. 1/3-octave analyzer mode
Frequency weightings A, C, Z AC electrical output (sine, 1000 Hz) - weighted frequency response A, Z - FSD output voltage for level range 14Vp-p - maximum output voltage 22Vp-p - output impedance 1kΩ - load impedance 10kΩ Time weightings SLOW, FAST
Extents of measurement range at specified level range and frequency weighting, for time-weighted sound level L and time-average sound level Leq
Extents of measurement range at specified octave bands and at most-sensitive level range(5 – 75 dB), for time-weighted sound level L and time-average sound level Leq
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1.5.3. Infra G filter mode
Extents of measurement range at specified level range and frequency weighting, for time- weighted sound level L and time-average sound level Leq Level range G 25 – 105dB TBD 45 – 125dB TBD 65 – 145dB TBD Extents of measurement range for LPk peak sound level Level range G 25 – 105dB TBD 45 – 125dB TBD 65 – 145dB TBD
WARNING! The extents of measurement range for peak level are determined for continuous 10Hz sine signal; measurement error extended by expanded measurement uncertainty is less than 1.1 dB. Self-generated noise - measured with electrical input facility installed ° at G frequency weighting TBD - measured with WK-21 microphone installed: ° at G frequency weighting TBD
Frequency weightings G, I AC electrical output (sine, 1000 Hz) - weighted frequency response Z - FSD output voltage for level range 14Vp-p - maximum output voltage 22Vp-p - output impedance 1kΩ - load impedance 10kΩ Time weightings SLOW Total range for LG sound level and LGeq time-average sound level TBD Total range for LIPk peak sound level TBD
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° at A frequency weighting not detectable ° at C frequency weighting ≤ 30.0dB ° at Z frequency weighting ≤ 32.0dB
° at A frequency weighting not detectable ° at C frequency weighting ≤ 30.0dB ° at Z frequency weighting ≤ 31.0dB
° at A frequency weighting not detectable ° at C frequency weighting ≤ 30.0dB ° at Z frequency weighting ≤ 31.0dB
1 2 4 5 6.3 8 10 12.5 16 20 25 135dB 0.07% 0.07% 0.08% 0.08% 0.08% 0.09% 0.09% 0.15% 0.98% 1.9% 1.7%
130dB 0.06%125dB 0.03%
135dB 0.07% 0.07% 0.07% 0.07% 0.07% 0.07% 0.07% - - - -130dB 0.04%125dB 0.03%
1.6. Influence of operating environment Influence of static pressure
- 85kPa108kPa range 0.6dB- 65kPa85kPa range 1.1dB
Influence of temperature 0.8dB Influence of humidity 0.8dB
Influence of vibration see Appendix C conformable to EN 61672-1:2002 specifications (maximum when microphone extension cable is parallel to field direction) Influence of electrostatic field conformable to EN 61672-1:2002
Influence of 80 A/m a.c. power-frequency magnetic field: - SLM mode (15 – 95dB level range)
- 1/1-octave analyzer mode (5 – 75dB level range, f = 63Hz)
- 1/3-octave analyzer mode (5 – 75dB level range, f = 50Hz)
- Infra G filter mode (25 – 105dB level range) TBD
1.7. Influence of instrument accessories Installation of additional equipment does not deteriorate accuracy class of the instrument, however some influence of this equipment on entire instrument performance can be detected. Influence of microphone extension cable its connection to the instrument causes nonlinear distortion increasing with frequency at high input signal levels – see table below.
f [kHz]
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Influence of windscreen (at 0º incidence) See table below and Fig. 1.9.
Fig. 1.9. Influence of OP1/2 windscreen.
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Influence of weatherproof screen (for 0º incidence) See table below and Fig. 1.10.
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2. CONTROLLING OF THE INSTRUMENT DSA-50 digital sound analyzer can be controlled either by instrument keyboard or by PC via USB interface. 2.1. Control keys Instrument keyboard contains following keys: power switch, function keys: MEMORY, FILTER, CLEAR, SETUP, TIME, RESULTS, RUN/PAUSE key, cursor keys, ENTER key .
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2.2. Input and output connectors of the instrument The layout of input and output connectors of the instrument is shown on Fig. 2.1 and Fig. 2.2.
The instrument is equipped with following input and output connectors: LEMO EGG.1B.307.CLL microphone connector for microphone preamplifier
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GS2-2 analogue AC electrical signal output connector
MJ-14 external power supply connector with 2.1 mm diameter central pin
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B-type USB interface connector for data exchange with PC
2.3. Default instrument settings
Default settings of DSA-50 after instrument turn-on are specified below: Operating mode Sound level meter (SLM)
d Level range 55–135dB Frequency weightings A and C Microphone heater Off Measurement history recording Off Integration time 99h 59m 59s (infinite) Noise exposure duration 8h 00m
The instrument setup can be recorded in measurement memory as follows: Turn the instrument on. Set proper operating mode, then select level range, frequency weighting, time weighting (only at 1/3-octave analyzer mode) and microphone heater state (ON or OFF). Save measurement result. To use setup previously recorded, after turning instrument on, open MEMORY menu and load the content of previously filled memory cell.
2.4. Preparation of the instrument to operation Screw WK-21 measurement microphone on microphone preamplifier. Take off microphone protecting cap. Connect this assembly to LEMO microphone connector. If microphone extension cable is to be used, insert it between microphone preamplifier and microphone connector. Place windscreen on the microphone, if necessary. External power supply is optional. External AC mains adaptor or external battery, or internal battery can be used to power the instrument. Turn the instrument on. Default instrument setup is specified in chapter 2.3.Now it is recommended to perform acoustic calibration of the instrument as described in chapter 5.3.After measurements completion, turn the instrument off and place protecting cap on the microphone.
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3. OPERATION To operate DSA-50 analyzer, select proper menu among from following: SETUP, RESULTS, TIME, FILTER, MEMORY and CLEAR using function keys. To select proper option of selected menu use arrow keys controlling the cursors. In some menus cursors are used to select proper value directly. Active keys are shown on instrument display. Every setting influencing the measurement, may be modified only when the instrument is set in PAUSE state. In RUN state the information on active keys is not displayed. Particular attention should be paid to results displaying manner in SLM mode. As the room to present measurement results on display screen is far insufficient to show results obtained for all measured quantities, it is necessary to select results to be currently displayed. Detailed description of the method of selection of results to be displayed can be found in chapter 3.3.1.In reduced capabilities version of DSA-50 analyzer following measurement options are unavailable: 1/1-octave analyzer (FILTER 1/1 octave), 1/3-octave analyzer (FILTER 1/3 octave), built-in microphone heater (SETUP MIC HEATER), infra G filter (FILTER infra G). If any of unavailable options is selected, then error message is displayed on the screen.
Fig. 3.1. Error message displayed when unavailable option is selected.
3.1. Instrument data plate After turning the instrument on, initial information is displayed on the screen. This information contains instrument name, firmware version and manufacturer data (name, website, phone).
Fig. 3.2. Instrument data plate.
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run the measurement and check if displayed sound pressure level is equal to 93.8dB. At present coupling of the microphone with sound source this indication corresponds to 94dB sound pressure level at free-field conditions, if instrument indication deviates from value mentioned above, then correct indication by turning calibration potentiometer located on instrument right-side panel (see Fig. 2.2) using supplied small screwdriver.
WARNING! During calibration the instrument together with sound calibrator shall not be exposed to noise higher than nominal sound pressure level of sound calibrator in use or ground vibration.
5.4. Warranty SONOPAN grants the warranty on following stipulations: no remains of changes, corrections, crossing-out etc. are found on Warranty Card, the instrument shall be used according to manufacturer Instruction Manual, the warranty becomes void if instrument repairs or modifications are undertaken by unauthorized persons. SONOPAN warrants this instrument: to be fulfilling the specifications given in Instruction Manual, to be working correctly for 12 months from purchase date in 24 months from date the instrument was produced. Not covered by this warranty: damages resulting from instrument transportation (provided no clear neglects of manufacturer have been stated), mechanical damages through the fault of the purchaser, internal damages through the fault of the purchaser. The purchaser is entitled to warranty claim only when instrument dealer does not meet his obligations resulting from this warranty. 5.4.1. Complaint instructions for the purchaser: contact SONOPAN and specify the cause of complaint, Warranty Card number, date and place of purchase and date the instrument was produced, after complaint receipt is confirmed send the instrument with Warranty Card included to SONOPAN by freight company, if SONOPAN service find instrument damage to be not covered by warranty or warranty conditions to be not fulfilled, then the purchaser is obliged to cover service and transport costs as specified in the bill made out by SONOPAN, the costs specified above are covered by SONOPAN if the complaint is accepted.
47
5.5. Maintenance and repair DSA-50 digital sound analyzer requires no special maintenance treatments. All repairs of the instrument are performed by the manufacturer.
6. CE MARKING AND CONFORMANCE TO EU COUNCIL DIRECTIVES The product described in this instruction conforms to following EU Council Directives:
89/336/EEC Electromagnetic compatibility
The conformance to above-mentioned requirements is confirmed by CE mark.
This product cannot be thrown away with household waste. Deposit the product in an authorized electrical and electronic waste collection area for recycling. Contact local Municipal Bureau or nearest waste disposal company to get more detailed information.
Appendix A. Filter characteristics
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