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CESVA SC-30 Скачать руководство пользователя страница 45

SC-30

User’s Manual

43

5.12 Reference conditions

Type of sound field:

Free

Reference direction

Perpendicular to the microphone
diaphragm

Reference sound pressure level:

94 dB (referred to 20

µ

Pa)

Reference frequency:

1 kHz

Reference temperature:

20 °C

Reference relative humidity:

65 %

Reference atmospheric pressure:

1,013 mbar

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Содержание SC-30

Страница 1: ...User s Manual SC 30 Sound Level Meter Spectrum Analyser M_SC30_v2007_20101228_ENG...

Страница 2: ...NOTE This version of the manual is valid for instruments with serial number from T223527...

Страница 3: ...2 2 3 Checking the SC 30 14 2 3 Measuring in sound level meter mode 16 2 3 1 Prior adjustments Preferential screen and integration time 16 2 3 2 Beginning a measurement 18 2 3 3 Functions display 18...

Страница 4: ...alibrated measurements 34 4 3 Print from the SLM 34 5 TECHNICAL SPECIFICATIONS 36 5 1 Measurement range 36 5 2 Detector Functions LF LS and LI 37 5 3 Peak detector Lpeak function 38 5 4 Integrator LT...

Страница 5: ...2 6 Percentile levels 51 7 APPENDIX B Reverberation Time Module 52 7 1 Activation of the Reverberation Time Module 52 7 2 Using the keyboard 52 7 3 Using the SC 30 53 7 3 1 Starting the SC 30 53 7 3 2...

Страница 6: ...r mode 61 8 3 3 Turn off the SC 30 62 8 3 4 SC 30 Menu 62 8 4 Measuring in dosimeter mode 62 8 4 1 Prior adjustments 62 8 4 2 Beginning measurement 63 8 4 3 Function display 63 8 4 4 Interrupting the...

Страница 7: ...during the measurement period The total percentile levels corresponding to 1 5 10 50 90 95 and 99 of the entire measurement and the partial levels of each T interval with frequency weighting A All th...

Страница 8: ...quently analyse it both quantitatively impulse or tonal sound level analysis and qualitatively exceptional sound event shouts undesirable noises etc detection The SC 30 is equipped with a 40 dB built...

Страница 9: ...nd level meter socket connector 5 Screen Illuminated LCD graphic screen 6 Membrane keyboard Extra flat keyboard designed to reduce the reflections that may reach the microphone from the sound level me...

Страница 10: ...8...

Страница 11: ...ecutive integrations of T time whether it is functioning as a sound level meter or spectrum analyser The T integration time for LT only Indication of the state of the measurement measurement completed...

Страница 12: ...he screen Key to select the desired sound level meter screen numerical graphic or statistical Key to switch from sound level meter to spectrum analyser and vice versa Key to access the preferred numer...

Страница 13: ...urn the SC 30 on the first thing you must do is connect it to a battery or other power supply Note The components referred to in the text are indicated on the outline on page 7 and listed in parenthes...

Страница 14: ...use the SC 30 for some time remove the battery to prevent damage caused by battery leakage Make sure you always carry spare batteries with you since you may be measuring somewhere where it isn t easy...

Страница 15: ...e sound level meter If you have purchased the CN 010 extension cable you can use the TR001 adapter to fit the preamplifier microphone to the TR 40 tripod To do that follow the next steps 1 Put the LEM...

Страница 16: ...l screen appears which may be one of the three sound level meter mode screens or one of the three spectrum analyser mode screens To display the different screens belonging to each mode press the key S...

Страница 17: ...lect the sound pressure level with fast time weighting FAST LAF LCF or LZF as the function to measure NOTE The frequency weighting makes no difference since calibration takes place at 1 kHz 6 Begin me...

Страница 18: ...nts including maximum and minimum values and percentiles see APPENDIX A Outstanding among the applications of the SC 30 are its ability to measure the sound level of noisy activities urban and road tr...

Страница 19: ...aneous minimum min or maximum max For more information on the names of the different functions see Appendix A The preferential numeric screen of the sound level meter mode displays the main function F...

Страница 20: ...motion 2 3 3 Functions display The SC 30 measures all functions simultaneously Below are described the different formats in which the acoustic functions are displayed while measurement is in progress...

Страница 21: ...peak X may be any frequency weighting A C or Z By pressing you display the preferential screen again By pressing you access the graphic sound level meter mode Graphic sound level meter mode This scree...

Страница 22: ...ntil the time when the process was paused During pause neither time nor level are acquired and the current period T will be held at the point where pause was selected To resume measuring press The cur...

Страница 23: ...consecutive intervals of length T To configure these parameters access the option SETTINGS MEASURING SPECTRUM ANALYSER on the SC 30 menu Press to begin setting the T parameter and then follow the pro...

Страница 24: ...sound pressure level with T integration time for octave bands centred on the frequencies 31 5 63 125 250 500 1 000 2 000 4 000 8 000 and 16 000 Hz without frequency weighting The peak sound pressure l...

Страница 25: ...sound pressure level of the T interval with frequency weightings A C and Z To change the selected octave band bar press left and right By pressing you access the room noise analyser mode Curves mode...

Страница 26: ...s made up until measurement was paused To resume measurement press By pressing stop the measurement process The state of measurement indicator will switch from to 2 4 5 Consulting the measured data Wh...

Страница 27: ...to reconfigure the instrument before beginning to measure 2 6 1 Accessing the menu To access the SC 30 menu press The following screen will appear This screen shows the main configuration menu togeth...

Страница 28: ...r of the language or of the sensitivity of the SC 30 o SETTINGS MEASURING SOUND LEVEL METER This option defines the 3 acoustic functions displayed on the preferential screen of the numeric sound level...

Страница 29: ...e section 2 2 3 checking the SC 30 o SETTINGS AC OUTPUT The SC 30 AC output signal is directly proportional to the preamplifier output This option allows you to adjust the gain of this output 0 dB or...

Страница 30: ...which may affect the measurement accuracy If you take measurements holding the SC 30 in your hand do so with your arm outstretched To avoid interference we recommend that you use the TR 40 tripod and...

Страница 31: ...can work with the accessories mentioned in the accessories section In case that using a different accessories and that this causes a failure in the equipment would not be responsible of this failure...

Страница 32: ...ntinuous sound pressure level with T integration time And their maximum and minimum values o The equivalent continuous sound pressure level for the entire measurement o The sound exposure level SEL o...

Страница 33: ...cording in sound level meter mode Four possibilities exist ALL each second this saves all the functions measured in sound level meter mode see 3 1 second by second F1 F2 AND F3 each second this saves...

Страница 34: ...al result is saved in the memory When carrying out a recording in spectrum analyser mode with T t the data recording and measurement stop if the memory fills up before the end of a recording 3 4 View...

Страница 35: ...gisters stored by the SC 30 Management of the registers erasure etc Programming of the sound level meter time sound level meter or spectrum analyser mode functions etc To transfer data you must connec...

Страница 36: ...The signal recorded in D A T may be analysed later by adjusting the D A T output and the analysis equipment input stage in order to ensure that the calibration sign measurement is correct The SC 30 A...

Страница 37: ...SC 30 User s Manual 35 The serial printer must have 80 columns The format for printing is the same that it is used for the data transference in section 4 1...

Страница 38: ...ement Range with nominal sensitivity of the microphone at 1kHz Upper limit Upper limit for crest factor 3 Upper limit for crest factor 5 Upper limit for crest factor 10 Lower limit Electrical Noise wi...

Страница 39: ...0 23 0 22 0 8 8 23 3 16 9 120 0 50 0 137 0 130 0 126 0 120 0 27 0 22 5 15 4 24 0 21 9 Lpeak Function Lower limit of the indicator Upper limit of the indicator Operating limits are modified by the sen...

Страница 40: ...nt 3 5 ms 5 3 Peak detector Lpeak function Rise time 75 s 5 4 Integrator LT Lt and LE functions Linearity range 110 dB Pulse range 65 dB Response time to a steady input signal 2 s 5 5 Frequency weight...

Страница 41: ...o is equivalent to 0 dB from 10 Hz to 20 kHz The tolerance for type 1 is the one defined by frequency weightings A and C 5 6 AC output Frequency weighting Linear Sensitivity at 137 dB and 1 kHz Gain 0...

Страница 42: ...mit Lower limit From 63 Hz to 8 kHz Upper limit Lower limit Higher than 8 kHz Upper limit Lower limit The noise electrical thermic of the microphone is as a minimum 10 dB lower than the lower limit of...

Страница 43: ...ion dB Frequency Hz Correction dB 31 5 0 1 2 000 0 3 63 0 1 4 000 1 2 125 0 0 8 000 3 2 250 0 0 12 500 6 3 500 0 0 16 000 8 8 1 000 0 1 C 250 prepolarised condenser microphone Polarisation 0 V Nominal...

Страница 44: ...one Frequency Hz S mV Pa 2 000 26 44 3 000 17 35 4 000 20 61 12 500 12 05 5 11 Directivity Sensitivity variation at 30 and 90 Frequency Hz 30 dB 90 dB 40 1 000 0 1 0 2 1 000 2 000 0 3 0 4 2 000 4 000...

Страница 45: ...ound field Free Reference direction Perpendicular to the microphone diaphragm Reference sound pressure level 94 dB referred to 20 Pa Reference frequency 1 kHz Reference temperature 20 C Reference rela...

Страница 46: ...at 50 Hz the reading will be under 25 dB A Sound pressure level at which the SC 30 meets the requirements of radiated electromagnetic field 74 dBA Set of accessories tested in the verification of the...

Страница 47: ...use the A 200 model mains feeder 5 19 Dimensions and weight Dimensions 341 x 82 x 19 mm Weight With battery 627 g Without 573 g 5 20 Preamplifier connector The preamplifier is connected to the SC 30 b...

Страница 48: ...purchased has been put on the market later than 13 August 2005 and complies with 2002 96 CE and 2003 108 CE directives about Waste from Electrical and Electronic Equipment WEEE Also the product is ma...

Страница 49: ...utdoors briefcase 51x38x15 cm ML060 Mains feeder A 200 and AM201 DC converter regulator A 100 for external battery car battery Microphone extension cable 3 m CN 003 Microphone extension cable 10 m CN...

Страница 50: ...sure level with integration time T Z LZT LZTmax LZTmin A LAt C LCt Equivalent continuous sound pressure level of the entire measurement Z LZt A LAE C LCE Sound exposure level S E L Z LZE A LApeak C LC...

Страница 51: ...such as vehicle noise while S response is recommended for noises that very more o 2 1 T t 2 F S p d e p 1 log 0 2 L p t instantaneous sound pressure p0 reference sound pressure 20 Pa 6 2 2 Sound pres...

Страница 52: ...h as road traffic or sound events that due to their long duration cover a wide range of sound pressure levels such as environmental measurements Percentile levels are the perfect complement to the equ...

Страница 53: ...Percentile levels L99 L95 L90 L50 L10 L5 and L1 These are the levels that were exceeded during 99 95 90 50 10 5 and 1 of the analysis time in decibels The LAF function is used to calculate them In so...

Страница 54: ...receive a CD with the activation program 7 1 Activation of the Reverberation Time Module NOTE Once a module has been activated it cannot be deactivated To activate the reverberation time module RT In...

Страница 55: ...0 measures simultaneously the reverberation time T20 and T30 for all the octave bands from 63 Hz to 4 kHz through the interrupted noise method This method lies in obtaining the sound pressure level de...

Страница 56: ...dB Increase progressively the sound pressure level until you obtain a sound pressure level of 35 dB upper to the background noise for calculating the T20 and 45 dB upper to the background noise for ca...

Страница 57: ...the measurement While the measurement is in progress it can be stopped by pressing The state of measurement indicator will switch from to 7 3 6 Overload and Over range indicator The SC 30 has an overl...

Страница 58: ...n to the reverberation time mode press 7 4 Data register The values of the measured functions may be stored in the SC 30 internal memory When the unit is switched off the data is saved and may be retr...

Страница 59: ...n the memory register number date and time of the beginning of the measurement process Information on the decay curve is not available 7 5 Technical Specifications 7 5 1 Measurement Range The decay cu...

Страница 60: ...ulation ISO 3382 1 Measurements of the reverberation time in performance spaces ISO 3382 2 Measurements of the reverberation time in ordinary rooms ISO 354 Measurement of sound absorption in a reverbe...

Страница 61: ...the initial one T20 Is the time in seconds that is required for the sound pressure level to decreases 60 dB calculated on a line from a lineal regression by least squares approximation of a decay curv...

Страница 62: ...ent level with frequency weighting A and C LAt LCt SNR and HML method simultaneously carries out a real time frequency analysis with frequency weighting A and by octave bands from 63 Hz to 8 kHz Octav...

Страница 63: ...i e Key to return to the previous octave band Key to go on to the next octave band or select between the numerical screen and the numerical screen with projected parameters Key to select the desired D...

Страница 64: ...nuous sound pressure level with frequency weighting A and C LAt and LCt and the peak sound pressure level with frequency weighting C LCpeak The frequency analysis of this mode shows the equivalent con...

Страница 65: ...meter follow the next steps Select the numerical value using and and confirm by pressing T integration time may be set from o 1 to 59 seconds 1 59 o 1 to 59 minutes 1 59 o 1 to 99 hours 1H 99 H Finall...

Страница 66: ...ntinuous sound pressure level with frequency weighting A and C corresponding to the measurement time LAt and LCt Peak sound pressure level with frequency weighting C corresponding to the measurement t...

Страница 67: ...ghting A Numerical value of the equivalent continuous sound pressure level with the integration time equal to the measurement time for the selected octave band bar with frequency weighting A Central f...

Страница 68: ...ost and can be retrieved and displayed directly from the SC 30 or transmitted to a PC The memory can be erased directly from the SC 30 Two kinds of registers may be saved in the memory The final resul...

Страница 69: ...erent kinds of recording lies in the number of functions storing time compromise See section 8 5 3 Before beginning a recording make sure there is no measurement in progress To begin a recording press...

Страница 70: ...f the measurement DOSE DOSEp LEX 8h p E and Ep functions are not saved Every time that a register is recovered these functions are calculated according LC and tp values set on the sound level meter Th...

Страница 71: ...normalized to 8 hours with frequency weighting A lg 10 0 8 T t L L At h EX LAt Equivalent continuous sound pressure level with frequency weighting A corresponding to the measurement time t Measuremen...

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Страница 73: ...SC 30 User s Manual 71...

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Страница 76: ...bajos 08041 BARCELONA ESPA A Tel 34 934 335 240 FAX 34 933 479 310 e mail info cesva com www cesva com Reserves the right to modify the characteristics and accessories of this manual without a previo...

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