Related Manuals for CESVA DC112
Summary of Contents for CESVA DC112
- Page 1 DC112d / DC112 Dosimeter / Dosimeter Spectrum Analyser User’s Manual M_DC112dDC112_v0035_20090923_ENG...
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Page 3: Table Of Contents
2.5.2 Menu of the DC112d/DC112 ..................21 2.5.3 Register management ....................21 2.5.4 Settings........................22 2.6 Switching the DC112d/DC112 off .................22 3. REGISTERING DATA......................23 3.1 Saving final results ......................23 3.2 Making a recording .......................23 3.2.1 Continuing a recording after the DC112d/DC112 has been switched off ....25... - Page 4 3.3 Viewing the register ......................25 3.4 Erasing the memory ......................25 4. DATA TRANSFER......................26 4.1 Transfer of data to a PC: Communication software ............26 5. PRECAUTIONS AND WARNINGS ...................27 6. TECHNICAL SPECIFICATIONS ..................28 6.1 Measurement range ......................28 6.2 Peak detector - L function ..................28 peak 6.3 Frequency weighting .....................28...
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Page 5: General Description
UNE-EN 61252:1998/A1:2003. Los dos modelos DC112d y DC112 disponen exactamente de las mismas características como dosímetro. The difference between the two models lies in the fact that only the DC112 is also a real time spectrum analyser in octave bands... -
Page 6: Activation Of The Frequency Analysis In Octaves Module For The Dc112D
The DC112d/DC112 has a USB port to download data to a PC at high speed. While the DC112d/DC112 is connected to the USB port of a PC it does not need batteries as it is powered by the USB port of the PC. -
Page 7: Functions
Time history of the equivalent continuous sound pressure level with A frequency weighting and integration time T. Apart from the aforementioned functions corresponding to the measurement time, when it carries out a recording, the DC112d/DC112 saves the time history of the following functions every T period: •... -
Page 8: Description Of The Dc112D/Dc112
1.4 Description of the DC112d/DC112 The most important parts of the DC112d/DC112 are detailed in the following diagram. 1. Microphone Prepolarised lapel condenser microphone: P007. 2. Support clip. Adjustable clip to fix the microphone to a lapel or helmet. 3. Microphone extension cable. 1m flexible extension cable for the P007 microphone. - Page 9 DC112d/DC112 User’s manual...
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Page 10: Screen
1.5 Screen While the DC112d/DC112 is carrying out a measurement the following information is shown in the bottom right-hand corner of the screen: • Measurement time lapsed t • Battery status indicator • Measurement status indicator: measurement finished measurement in progress... - Page 11 Key to continue a measurement (when the DC112d/DC112 is on Key to interrupt (PAUSE) a measurement (while the DC112d/DC112 is on Or to begin a recording in the memory (when the DC112d/DC112 is on Key to return to the previous octave band Key to move on to the next octave band, or to move on to the numerical screen with projected parameters.
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Page 12: Using The Dc112D/Dc112
If any of these elements should be missing, contact your official distributor. 2.1.2 DC112d/DC112 Power source The first operation to carry out, before switching on the DC112d/DC112, is to supply power. DC112d/DC112 dosimeter powered by a 6LF22 type 9V alkaline battery, or via the USB port [ 8]. -
Page 13: Connection And Disconnection Of The Microphone
RECOMMENDATIONS: If the DC112d/DC112 is likely to be unused for an extended period of time, remove the batteries from the DC112d/DC112 in order to prevent damage caused by battery leakage. We recommend that you always carry new replacement batteries 2.1.3 Connection and disconnection of the microphone... -
Page 14: Fixing The Dc112D/Dc112 On The User (Worker)
2.1.4 Fixing the DC112d/DC112 on the user (worker) The DC112d/DC112 has a support clip [ 13] to fix it to the user’s belt (see figure) and an adjustable metal clip [ 2] to attach the microphone to their collar or helmet. -
Page 15: Testing The Dc112D/Dc112
CB004 or CB006 sound calibrator and proceed as follows: 1) Insert the microphone of the DC112d/DC112 in the cavity of the calibrator. Make sure it has been fully inserted, and is parallel to the axis of the calibrator (see figure). This may require a little force, as the microphone must fit into the calibrator perfectly. - Page 16 The free field pressure correction of the P007 microphone is 0.1 dB. That means the DC112d/DC112 should indicate a level of 93.9 4) Switch the DC112d/DC112 to the numerical screen ( 2.2.2), by pressing: 5) Start the measurement: 6) Check that the value of the L function coincides with the value of 94.0 dB with the...
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Page 17: Measuring With The Dc112D/Dc112
C weighting (L Cpeak Only the DC112 carries out a frequency analysis, measuring, in real time, the equivalent continuous sound pressure levels for the octave bands between 63 Hz and 8 kHz with A frequency weighting. - Page 18 Finally select the time units: seconds (“), minutes (‘) or hours (H) with the help of and press to confirm. Use to cancel or return to the menu. To set the frequency weighting applied to the spectrum access the menu of the DC112 and select SETTINGS MEASURING SPECTRUM ANALYSER...
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Page 19: Beginning A Measurement
( ), press to stop it. Next, set the DC112d/DC112 to dosimeter mode and choose the screen you want to display (numerical, numerical with projected values, spectrum analyser or time history), with the key. Once you have selected your screen, press to start the measurement process. - Page 20 L and the projection time t set on the sound level meter. 1/1 Spectrum analyser screen (only DC112) This screen shows, in real time, the following information: • Graph of the equivalent continuous sound pressure level with the integration time...
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Page 21: Blocking The Keypad
Measurement time (t) and integration time elapsed. 2.3.4 Blocking the keypad While a measurement or recording is in progress, the keypad of the DC112d/DC112 can be blocked; this way accidental interventions in the process can be avoided. To block the keypad, press . -
Page 22: Ending A Measurement
2.3.7 Consulting measured data While the DC112d/DC112 is not measuring ( ), you may consult all the functions measured. To consult them, apply the same procedure as described in section 0 on viewing data while measurement is in progress. -
Page 23: Menu Of The Dc112D/Dc112
• SAVING RESULTS: When this option is selected the DC112d/DC112 records in its memory the final results of all the functions measured. The DC112d/DC112 indicates the number of the register in which the registers have been recorded. For more information see section 3.4. -
Page 24: Settings
2.5.4 Settings • SETTINGS: This option enables you to set a number of features of the DC112d/DC112, eg. Time/date adjustments, language or sensitivity of the DC112d/DC112. SETTINGS MEASURING With this option the acoustic parameters for the evaluation of noise at work: level... -
Page 25: Registering Data
User’s manual 3. REGISTERING DATA The DC112d/DC112 can record in the internal memory the values of the functions measured. When the equipment is switched off the recorded data is not lost and can be retrieved and displayed directly from the DC112d/DC112 or transmitted to a PC. The memory can be erased directly from the DC112d/DC112. - Page 26 To continue the measurement, see section 3.2.1. If the power source of the DC112d/DC112 is cut off suddenly during a recording, (removal of the battery, or the USB connection), the recording will be incomplete. It will not be able to be...
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Page 27: Continuing A Recording After The Dc112D/Dc112 Has Been Switched Off
(register number + date and time when the measurement process began). To view the different functions, follow the procedure described in section 2.3.3. 3.4 Erasing the memory This option enables you to wipe the memory completely. The DC112d/DC112 asks for confirmation before erasing. MEMORY ERASE MEMORY. -
Page 28: Data Transfer
Register management (erasing, etc.). • Programming the dosimeter (time, parameters, etc.). To carry out these functions the DC112d/DC112 must be connected to the USB port of a computer with the cable supplied. For more information about Capture Studio, use the help that it incorporates. -
Page 29: Precautions And Warnings
• The microphone must never be dismantled, as this may cause permanent damage. • Any knocks on the DC112d/DC112 will be picked up by the microphone, and this may affect the value of the measurement. • We recommend that you test the DC112d/DC112 before and after every measurement, using the sound calibrator. -
Page 30: Technical Specifications
6. TECHNICAL SPECIFICATIONS 6.1 Measurement range Measurement range Function Lower limit Upper limit Units 0000:00:00 1999:59:59 HHHH:MM:SS 9999999 Cpeak DOSE 9999999 999,9 EX,8h Total Maximum Noise at 20 ºC Frequency Weighting Total Maximum Noise 43 dB 53 dB Margin of frequencies maintained when the frequency response 31,5 Hz a 12,5 Khz extends to frequencies below 63 Hz or above 8 kHz 6.2 Peak detector - L... -
Page 31: Sound Pressure Level Range According To Frequency
DC112d/DC112 User’s manual The following table shows the A and C frequency weightings along with their tolerance. Frequency A Weighting C Weighting Tolerance (Hz) (dB) (dB) (dB) ± 2,0 - 26,2 - 0,8 - 16,1 - 0,2 ± 1,5 ± 1,5... -
Page 32: Octave Band Filters
6.5 Octave band filters Frequency evaluation system Base 10 Reference attenuation Margin of frequencies for real time operation 31,5 Hz a 16 kHz Octave band central frequencies Nominal central frequency Exact central frequency 63 Hz 63,096 125 Hz 125,89 250 Hz 251,19 500 Hz 501,19... -
Page 33: Reference Conditions
6.8 Electrical signal insertion Can be carried out with a Coaxial LEMO [5] connector situated at the top of the DC112d/DC112. The ADM0P007 adapter must be used. The devices connected must have an electrical impedance of less than 100 Ω. -
Page 34: Influence Of Humidity
The equipment shows no degradation or loss of function after being exposed to electrostatic discharges. The DC112d/DC112 shows a slight variation with respect to the electric field with the instrument perpendicular to the propagation direction and the cables extended perpendicular to the main axis of the instrument... -
Page 35: Batteries And External Supply
DC112d/DC112 User’s manual 6.15 Batteries and external supply Battery One 6LF22 type 9 volt battery Typical battery life with continuous use: 20 hours The typical battery life with the display lit may be reduced by up to 50% with respect to the previous value... -
Page 36: Notes
It is obligatory to send the DC112d/DC112 to an authorised laboratory annually, to test its acoustic and electric characteristics are working correctly (periodic testing). 6.20 Accessories... -
Page 37: Appendix A: Functions
) is the equivalent level corresponding to T integration time (a programmable parameter). It is displayed every T time period. In other words, every T time period the DC112d/DC112 shows the equivalent level of the last T time period. 7.1.2 Peak sound pressure level... -
Page 38: Dose
Sound exposure Sound exposure, time integral of the instantaneous squared sound pressure with A frecuency weighting over a specified measurement time, expressed in Pa ·h. ⎛ ⎞ ∫ ⎜ ⎟ ⋅ ⎜ ⎟ ⎝ ⎠ Instantaneous sound pressure with A frequency weighting. 7.1.4 Dose DOSE Relationship between the energy of the measurement interval and the... -
Page 39: Appendix B: Conditions Of Verification
DC112d/DC112 User’s manual 8. Appendix B: Conditions of verification Below are the conditions of verification recommended by 8.1 Verification procedures , as manufacturer, recommends two alternatives for the verification of the DC112: Verification in units of sound exposure (Pa²h) Verification in units of equivalent sound level (Leq) 8.1.1 Verification in units of sound exposure (Pa²h) - Page 40 2. FREQUENCY WEIGHTING Freq. weight. A f (Hz) L (dB) t (s) E (Pa²h) (dB) 137,0 -26,2 0,013358 137,0 -16,1 0,136697 137,0 -8,6 0,768701 137,0 -3,2 2,665370 1000 137,0 5,568747 2000 137,0 7,341038 4000 137,0 7,010637 8000 137,0 -1,1 4,322724 3.
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Page 41: Verification In Units Of Equivalent Sound (Leq)
A) ABSOLUTE ACOUSTICAL SENSITIVITY a) Switch the DC112 to the menu “SENSITIVITY ADJUST”. b) Apply a level of 94,0 dB to the microphone of the DC112 with the sound calibrator, and wait 10 seconds. c) Adjust the sensitivity of the meter so that the L... - Page 42 D) RESPONSE TO SHORT DURATION SIGNALS a) Select L A1” b) Adjust the level of a reference 4 kHz sinusoidal signal to indicate 94,0 dB. c) Select L A10” d) Apply a continuous sequence of 4 kHz tonebursts of 1 ms duration, with an amplitude equal to the reference signal, and a burst ratio of 1/100.
- Page 43 DC112d/DC112 User’s manual CRITERIA FOR ACCEPTANCE AND REJECTION A) ABSOLUTE ACOUSTIC SENSITIVITY The reading, in reference conditions, must be 94,0 dB ± 1,0 dB. B) FREQUENCY WEIGHTING The indication should vary according to the following table: FRECUENCY A WEIGHTING TOLERANCE...
- Page 44 F) OVERLOAD INDICATOR With a pulse of 140 dB the overload indicator should not appear. It should appear with a pulse of 143 dB. G) SOUND EXPOSURE The indication should vary according to the following table: EXPECTED SOUND SIGNAL LEVEL TOLERANCE DURATION OF EXPOSURE...
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Page 45: Alternative Free-Field Method
Sound field Pressure Sound Level dB Lin. 94 b) Insert the microphone of the DC112 into the acoustic coupler of the multi-function acoustic calibrator c) On the multi-function acoustic calibrator select: Frequency Hz Wait until the corresponding LED stops flashing. - Page 48 Villar, 20, bajos – 08041 BARCELONA (ESPAÑA) Tel. (+34) 934 335 240 – FAX (+34) 933 479 310 info@cesva.com e-mail: www.cesva.com...