Noise Sentry - Convergence Instruments
Contents
1. battery 6 1 Power On Power Off Behaviour The unit is switched ON in the following circumstances e When the battery is first inserted in the unit In this case a recording is not automatically started e When the Noise_Sentry__Manager application is started and takes control of the Noise Sentry In this case a recording is not automatically started e When the button has been enabled for On Off function and is pressed In this case a recording is automatically started upon power up The unit is switched Off in the following circumstances e When the button has been enabled for On Off function and is pressed In this case any ongoing recording is stopped e When the Noise_Sentry__Manager application that was controlling the unit is exited This is only the case if a recording is not ongoing If a recording is in progress the application exits but leaves the unit On and recording 6 2 Sampling Modes The unit features two sampling modes e Fast The fast sampling mode provides a measurement time constant of 125 ms It has a battery life of 5 days The Fast mode should be used if short transient bursts are expected e Slow The slow sampling mode provides a measurement time constant of 1 s It has a battery life of 10 days The Slow mode should be used when the measured acoustic levels are changing slowly It should not be used if short transient bursts are expected 6 3 Recording When the Noise Sentry is recording it integrates meas2. 13 7 3 8 Web Remote Button 14 7 4 Log Tab 14 7 5 Frequency Tab 14 Noise Sentry User s Manual 7 6 Remote Control from Web Browser 15 7 6 1 Remote Access Setup on a Local Network 16 7 6 2 Remote Access Setup On The Internet Behind A Remote Router 16 8 IMPROVING COMMUNICATION SPEED 9 MAINTENANCE 9 1 Battery Change 17 17 17 9 1 1 Reset Procedure 18 9 1 2 Battery Type 18 9 2 Cleaning 18 19 9 3 Software and Firmware Upgrades 10 TROUBLESHOOTING 10 1 Cable Driver Installation 19 19 10 2 Connection Problems 19 11 SPECIFICATIONS 12 FREQUENCY RESPONSE TYPICAL 13 LINEARITY 14 SPECIFICATIONS OF NOISE_SENTRY_MANAGER SOFTWARE _ __ Noise Sentry User s Manual 19 20 21 21 1 Introduction The Noise Sentry is a high performance integrating Sound Level Meter and data logger It includes a sensitive microphone an accurate date time clock and a non volatile 52000 point recording memory It can integrate and record sound levels for up to 10 days Its very small size allows it to be worn or embedded within monitored equipment The sound level meter includes the following features All Digital design Individual digital frequency correction and calibration Frequency spectrum dB A and dB C weighting functions Measures and records max average and min levels over adjustable intervals An alarm function activates on the instantaneou
3. LED indicator can be used for two functions e Power Indicator The LED flashes once every two seconds to indicate that the Noise Sentry is On e Alarm The LED flashes twice every two seconds to indicate an alarm The alarm can be triggered on either e An instantaneous level over the set limit e An averaged equivalent level Dose over the set limit The alarm is triggered by the value of the ongoing statistics not the value of the recorded statistics Therefore the alarm function is always On even when no recording is in progress There are two ways to clear an alarm Noise Sentry User s Manual 7 e Press the button on the unit if the button is set to the Clear mode Note that when the button is set for On Off function pressing the button will power off the unit but not clear the ongoing statistics or the alarm e Press the Clear button in the front panel of the Noise_Sentry__Manager application Either action clears the ongoing statistics and the corresponding alarm 6 6 Button Functions The multi function button can be set to trigger the following actions e Clear an alarm Pressing the button clears the ongoing statistics and any corresponding alarm e On Off Pressing the button toggles the power on and off In addition the unit starts recording a new log every time it is switched on and stops recording the current log every time it is switched off The button function can be selected with the Noise_Sentry__Manager appl
4. PC the PC detects it and provides an initial configuration This configuration is functional but does not yield the best communication speed To improve the communication speed follow the steps below 9 9 1 Connect the MLI cable into the PC and wait for the PC to recognize it The PC normally makes a sound to indicate that the cable is recognized and its driver is loaded Windows Vista Go into Control Panel gt System and Maintenance gt Device Manager Windows XP Go into Control Panel gt Performance and Maintenance gt System gt Hardware gt Device Manager In the Device Manager open the Ports Com and LPT item Double click on the item named USB Serial Port Make sure that the manufacturer reads FTDI Otherwise find another item named USB Serial Port Select the Port Settings tab In this page click the Advanced button To the right of the Latency Timer ms adjust the latency to the minimum 1ms Click OK to all the windows to close them Maintenance Battery Change To change the battery follow the procedure below 1 Slide a flat screwdriver in the crack on the side of the unit 2 Gently twist the screwdriver to unsnap the unit open Be careful not to damage the casing If necessary repeat the operation at several locations around the casing 3 Take the pri nted circuit board out of the casing Noise Sentry User s Manual 17 4 Slide the battery out of the battery holder Apply the reset procedu
5. application is used to change the recording settings It also provides access to all the logs in memory When the recording reaches the end of the memory the recording is automatically stopped but the unit stays On and keeps integrating the min max and average levels The alarm function stays On also The memory can be cleared at any time to make room for new measurements by using the Noise_Sentry__Manager application The memory is non volatile In case of battery failure the data recorded up to the battery loss is preserved 6 4 Ongoing vs Recorded Statistics The Noise Sentry level meter keeps two sets of statistics e Ongoing The ongoing max current min and average Dose levels are displayed on the front panel of the Noise_Sentry__Manager application in real time The integration of these statistics is started any time the Clear button is pressed in the application front panel and goes on irrespective of the recorded statistics The integration of the ongoing statistics is paused but not reset when the unit is powered off It resumes when the unit is powered on The alarms are based on the ongoing statistics e Recorded The recorded statistics max min and average are reset and restarted automatically at the end of each Log interval window These statistics cannot be directly observed in real time To see the results the recorded logs must be downloaded from the unit and displayed or exported 6 5 LED indicator and Alarms The
6. 6 4k Frequency Hz Figure 5 Typical frequency response error in dB A and dB C Noise Sentry User s Manual 20 13 Linearity Noise_Sentry dB 1 1 110 0 115 0 Figure 6 Linearity 14 Specifications of Noise_sentry_Manager Software Windows XP and Windows Vista compatible Real time display of measurements Displays frequency spectrum Complete instrument configuration including date time alarms types of statistics recorded and recording rate Collect and displays data while recording e Auto scale zoom and pan on temperature and motion graphs e Export recorded data to Excel format Noise Sentry User s Manual 21
7. C Verify that the PC properly detects the cable and loads the driver In case of doubt see the Troubleshooting section 3 Initial Test and Configuration If this is not already the case insert a fresh CR2032 battery in the battery compartment Be careful about battery polarity See the Battery Change subsection in the Maintenance section for detailed instructions Upon battery insertion the LED starts blinking rapidly for a few seconds then at a rate of once every two seconds If this is not the case remove the battery perform the reset procedure see below and insert the battery again Connect the MLI cable into an available USB port of the PC Connect the other end of the MLI cable into the side of the Noise Sentry Go into Start All Programs Noise Sentry and run Noise_Sentry_Manager exe The front panel described in figure 3 appears and the application tries to connect to the unit If it fails to find the unit it indicates No Device Found and closes If this is the case see the Troubleshooting section Otherwise the application switches on the Noise Sentry and starts communicating with it If the Time and Date in the upper right corner of the application window are not properly adjusted the application asks if you want the time to be synchronized with the PC time Upon stopping the application the Noise Sentry is switched off except if it is recording Instrument Functions and Description The instrument measures and optionally recor
8. Clear Pressing the button clears the ongoing statistics and the alarm if one is in effect e On Off Pressing the button toggles recording and power On and Off When the unit is switched on a new recording is started When the unit is switched off the current recording is stopped e None The button has no effect Use this setting to avoid improper intervention during measurements or recording 7 3 7 Battery Condition Field This field indicates the remaining battery capacity as well as the total battery life at the upper scale marker The total battery life changes with the sampling mode The Slow mode has a battery life of 10 days while the Fast mode has a battery life of 5 days Noise Sentry User s Manual 13 7 3 8 Web Remote Button When this button is pressed the application is accessible using a web browser see section below for setup When the button is released the application does not accept remote connections 7 4 Log Tab The log tab is seen in figure 4 It is used to retrieve the recorded information from the Noise Sentry and to display the recorded logs in graphical form 1 Log Number Selector Selects a particular log in memory for display The first recorded log has index 0 the last log has index N 1 When the recording memory is initially read the index is set to the newest last log in memory 2 Global Statistics Indicator Displays the Min Max and Equivalent Level Dose measured over the data displayed on the g
9. Convergence Instruments Noise Sentry User s Manual T Note Sentry Manager Setup Frequency tog a oo T or Date of Barth TNS mt Modei Sun Sep 0 2009 ot 1142 4M Proto V200 0011 SN Sat Jon amo East Calibration Tax Hirmware Revision 24 PM Reconting ii EQ iMa Rec Depth trase Od Oh Sm tM 1316 Cerent s1 tin 1 a Dore LEQ 52 Convergence instruments ay gt Aarm on Dose Narn on Level m Frequency Hz Current 1984k 24 Current Reference iV EEFE September 25 2010 Bruno Paillard 5 10 WS 10 15 10 ponn aa i 1 INTRODUCTION 3 2 APPLICATIONS 3 3 WARNINGS 3 4 GETTING STARTED 4 4 1 1 Software Installation 4 4 1 2 Hardware Installation 4 4 1 3 Initial Test and Configuration 4 5 INSTRUMENT FUNCTIONS AND DESCRIPTION 4 6 PRINCIPLES OF OPERATION 5 6 1 Power On Power Off Behaviour 6 6 2 Sampling Modes 6 6 3 Recording 6 6 4 Ongoing vs Recorded Statistics 7 6 5 LED indicator and Alarms 7 6 6 Button Functions 8 6 7 Battery Life 8 7 NOISE_SENTRY _MANAGER APPLICATION 9 7 1 Starting the Application 11 7 2 Main Functions 12 7 3 Setup Tab 12 7 3 1 Time and Date Field 12 7 3 2 Recording Setup Field 12 7 3 3 Ongoing Measurements and Statistics Field 13 7 3 4 Alarms 13 7 3 5 Tracking Field 13 7 3 6 Button Function 13 7 3 7 Battery Condition Field
10. N O Noise Sentry User s Manual 11 Fe a tr anager f _f Rec_Proto_V200 0 2 m r 7 7 bog 0011_2010_01_29_08h21m47s cil 6 ee ee o Laie os x 01 09 54 PM 9101 4 09 20 2009 m 10 Figure 5 Frequency Spectrum Display dB SPL Pa Selector Scale Indicator Cursor Field Pan and Zoom Buttons Averaging Controls Averaging Reset Button Reference Button Window Type Control Real Time Spectrum 10 Reference Spectrum 11 Cursor OONOTMAWN 7 1 Starting the Application The application can be run with or without a Noise_Sentry connected When a Noise_Sentry is not connected the application can only be used to display and analyze a previously saved log file All the controls and indicators related to the instrument are grayed out To use the application to control a Noise_Sentry do the following 1 Connect the MLI cable into an available USB connector on the PC Connect the other end of the MLI cable into the side of the Noise Sentry The MLI socket is polarized if it does not insert easily turn the connector over 3 Go into Siart All Programs Noise_Senitry and run Noise_Sentry_Manager exe 4 The front panel described in figure 3 appears and the application tries to connect to the unit If it fails to find the unit it indicates No Device Found and closes If this is the case see the Noise Sentry User s Manual 11 Troubleshooting section Otherwise the application immediately starts communicating wi
11. ds Instantaneous acoustic level Max acoustic level Min acoustic level Average acoustic level Equivalent Level or acoustic dose Time The unit connects to a PC via its ML adapter cable The Noise_Sentry_Manager application is used to set its operating parameters and download recordings Note Only use the MLI cable provided with the Noise Sentry Noise Sentry User s Manual 4 Figure 1 Noise Sentry front MLI cable connector LED indicator Multi function button Microphone EOD Figure 2 MLI adapter cable 6 Principles of Operation The Noise Sentry starts working as soon as the battery is installed Upon battery insertion the LED starts blinking rapidly for a few seconds then at a rate of once every two seconds The Noise Sentry starts measuring average minimum and maximum acoustic levels However it does not record at this point Also its date and time are initially adjusted to December 1903 The initial setup of the Noise Sentry is as follows dB A weighting Slow sampling mode long battery life Recording max average and min 1s recording interval 4 h 50 m recording depth On Off button function Noise Sentry User s Manual 5 The setup of the Noise Sentry can be adjusted via the Noise_Sentry__Manager application Pressing the button toggles between the switched off state and the on recording state The Noise Sentry can operate and record acoustic levels for up to 10 days on a small coin lithium
12. f dirt or debris is lodged in the plug or socket use a can of compressed air to expel it Make sure not to blow the air in and around the microphone port If compressed air is not enough use a clean piece of cloth dipped in alcohol Make sure that cloth particles do not remain in the connector 11 Specifications Bandwidth 20Hz to 20 kHz Dimensions 3 4 cm x 5 7 cm 1 35 x 2 in Weight 20 g 0 7 oz Measurements e Max Acoustic Level linear Pa or dB SPL e Min Acoustic Level linear Pa or dB SPL e Average Acoustic Level LEQ linear Pa or dB Noise Sentry User s Manual 19 Weighting Functions Alarms Battery life Battery type Operating temperature range Storage temperature range Noise Floor Saturation Level Resolution Recorded Resolution Precision Sensor Type Recording interval Recording memory type Recording erasure cycles Recording memory Depth 12 Frequency Response typical Frequency_Response 5 0 4 0 SPL A C Max Instantaneous Level Max Integrated Level Dose 10 Days Slow Mode 5 Days Fast Mode CR2032 lithium battery 20 degC to 70 degC 4 degF to 158 degF 30 degC to 80 degC 22 degF to 176 degF 39 dB typical 110 dB typical 0 1dB 1dB 2 dB 50 Hz 10 kHz 5 dB 20 Hz 20 kHz MEMS Microphone Adjustable 1s to 12H with 1s resolution Non Volatile More than 10 000 52 000 individual measurement points 5 0 1 1 1 1 50 0 100 0 1 0k 10 0k 1
13. fe Slow has a display time constant of 1s It is well adapted for measuring steady levels The current consumption is less and the battery life is almost 2 weeks e The Weighting selector selects the dB A or dB C frequency response e The compound level meter displays the following statistics e The outer bar displays the integrated Dose Equivalent Level e The light blue bar displays the minimum level e The green bar displays the current level e The yellow bar displays the maximum level e All the numerical values of these statistics as well as the integration time are displayed to the right of the bar graphs e The Clear button resets the ongoing level statistics It has no effect on the statistics that may be being recorded e The dB Pa selector sets the scale for all level indicators and controls to either dB SPL or Pascal scale 7 3 4 Alarms An alarm can be triggered whenever either the current level or the Dose goes above the set threshold The alarm is triggered on the Ongoing statistics This means that when an alarm is triggered it stays On until the Ongoing statistics are cleared by pressing the Clear button The Threshold is defined in the same scale as the current level displays dB SPL Pa button 7 3 5 Tracking Field The tracking field provides instrument information such as instrument model serial number and firmware revision 7 3 6 Button Function The Button function selector defines the function of the button e
14. for panning in X and Y The cross is used to move the cursor on the graph 5 Averaging Controls Sets the type of averaging and averaging length 6 Averaging Reset Button When the button is pressed the spectrum averaging is reset The averaging memory is erased and the averaging starts anew 7 Reference Button When the button is pressed the spectrum presently displayed is captured and displayed as a reference in red This is useful for doing comparisons 8 Window Type Conirol This control selects the type of analysis window used on the time signal The window type provides a compromise between frequency resolution and off band leakage The Hanning window is generally a good compromise 9 Real Time Spectrum Represents the averaged energy spectrum of the analyzed signal 10 Reference Spectrum Whenever the Reference button is pressed the current spectrum is captured and presented in red in the graph The reference curve does not show up until the reference button is pressed 11 Cursor The cursor can be moved on the graph It locks to the main or reference spectrum Tip Writing a new value directly to either the first or last marker of the X or Y scale rescales the graph so that this value is at the edge 7 6 Remote Control from Web Browser The Noise_Sentry_Manager application is web enabled When this feature is active a remote user can observe and control the Noise_Sentry_Manager application from a remote computer using a web b
15. graph 12 Mode Indicators These indicators show the sampling mode and weighting function for the recording currently displayed 13 Cursor The cursor can be moved on the graph It locks to the min max or average level graph Tip Writing a new value directly to either the first or last marker of the X or Y scale rescales the graph so that this value is at the edge 7 5 Frequency Tab The frequency tab is seen in figure 5 It is used to display a real time frequency spectrum of the acoustic signal being measured The spectrum accounts for the weighting function A or C that is selected in the setup tab The spectrum is presented with an absolute energy scale A 60 dB SPL pure sine will create a harmonic line peaking at 60 dB The spectrum is calculated on 128 point signal windows This provides a coarse resolution spectrum Pure harmonics are represented with wide bands as in figure 5 The exact shape of the bands depends on the selected analysis window and the scale dB or linear 1 dB SPL Pa Selector Sets the Y scale to decibels or Pascal Noise Sentry User s Manual 14 2 Scale Indicator This indicates the scale dB pr Pa as well as the weighting function in effect A or 3 Cursor Display Area This area displays the frequency and level at the cursor location 4 Pan Zoom and Cursor Buttons The magnifier glass has several modes for zooming in X and Y or to go back to the full size view auto scale The hand is used
16. hat is on the same local network e Type the IP address of the local computer followed by the 8000 Noise_Sentry html port number and file name For instance assuming the local IP address is 192 168 1 103 type http 192 168 1 103 8000 Noise_Sentry htmi e _ If the browser asks you to download and install a plug in accept Note that some browsers will direct you to the download page but will not execute the download automatically In that case choose the LabVIEW run time engine for LabVIEW 2009 SP1 for the platform corresponding to the remote computer the one from which you are downloading e After the download has completed the front panel of the Noise_sentry_Manager application appears Note that this can take some time The application is visible and controllable from the remote computer Note The setup can be tested by first trying to connect from a web browser on the local server itself This eliminates any possible problem with the network itself 7 6 2 Remote Access Setup On The Internet Behind A Remote Router e Prepare the setup as explained in the previous section e Test the connection on the local network first It will not work globally if it does not work locally first e Setup the router s configuration by logging on to the router See your router s manual for how to do this e Setup the router so that the IP address of the local server computer is fixed Many routers have a function where a computer with a s
17. ication 6 7 Battery Life The battery life depends on the Sampling Mode setting e When the unit is in Fast mode the battery life is 5 days e When the unit is in Slow mode the battery life is 10 days When the Noise Sentry is Off its only function is to keep track of the time In this state the battery can last for more than 5 Years Noise Sentry User s Manual 8 7 Noise Sentry Manager Application 16 15 14 13 12 11 2 3 10 9 Figure 3 Noise_Sentry _Manager Setup tab 1 Date Time Field 2 Recording Setup Field 3 Sampling Mode Controls 4 Ongoing Statistics Indicator Acoustic Dose Equivalent Level 5 Ongoing Statistics Indicator Min Acoustic Level 6 Ongoing Statistics Indicator Current Acoustic Level 7 Ongoing Statistics Indicator Max Acoustic Level 8 dB SPL Pa Selector 9 Ongoing Statistics Clear Button 10 Numerical Ongoing Statistics Indicators indicate the same as the Vu Meters 11 Web Remote Enable Control 12 Alarm Setup Field 13 Instrument Tracking Information 14 Button Function Field 15 Battery Condition and Lifetime Field 16 Tab Selector Noise Sentry User s Manual 9 13 12 3 Se Figure 4 Noise_Sentry _Manager Log tab Log Selector Level Statistics dB Pa Scale Selector Level Graphs Export Button Instrument Download Button File Open Button File Save Button Cursor Field Data Source Pan and Zoom Buttons Sampling Modes Cursor ODNRARONS ai ai ai i U
18. n a recording is not in progress A recording in progress uses the parameters that have been set when the recording was started To start a recording press the Record button To stop a recording press the Record button again A log is defined as a stretch of recording between the moment the recording is started and the moment it is stopped Each time a recording is started a new log is created and stored in memory after the previous one New logs can be created as long as there is some amount of recording memory available To erase the contents of all the recording memory and make room for new logs press the Erase button Note Pressing the physical button on the Noise Sentry unit instead of the Record button on the Setup tab of the application will also start and stop the recording However it will also switch the unit On and Off It is possible to switch Off the unit while connected to the application However it will not take current measurements or log ongoing statistics The level indicators will appear frozen until the unit is switched On again Noise Sentry User s Manual 12 7 3 3 Ongoing Measurements and Statistics Field This field provides information about the current acoustic level measurements and statistics e The Sampling Mode selector sets the measurement to either fast or slow Fast has display time constant of 125 ms It is better for capturing short transients but increases current consumption and shortens the battery li
19. pecified MAC address is assigned a fixed IP address Make a note of the chosen IP address for instance 192 168 1 103 e Select Port Forwarding in the router for the local IP address selected previously for the server 192 168 1 103 in the example Select the TCP protocol on port 8000 From now on all the router s incoming TCP packets for port 8000 will be directed to the server at the local address 192 168 1 103 e Make a note of the public IP address that your Internet Service Provider assigned your router If in doubt you can log on to a service such as http whatismyipaddress com using a web browser on the local server to discover the router s address on the internet e Connect to the server just as you did on the local network but this time using the public IP address assigned by the Internet Service Provider instead of the address of the computer in the local network e The IP address that your Internet Service Provider assigned the router may change over time To avoid the difficulties associated to these changes you can use a service such as the free service at www dyndns com to catalog your web server s name Then you can access your instrument using the URL that you defined in the service e Make sure that your Internet Service Provider allows you to setup a web server behind the router Some of them don t Noise Sentry User s Manual 16 8 Improving Communication Speed When the MLI cable is initially connected to the
20. raph The statistics only include the data in the time interval presently displayed Zooming on a specific time interval excludes the data outside of the zoom window 3 Scale Button Sets the scale to either dB SPL or Pascal 4 Level Graph Displays min max and or average levels as a function of time If a particular measurement was not recorded the corresponding curve is absent from the graph 5 Export Button Press the button to export the record presently displayed to an Excel Tab delimited file 6 Instrument Download Button Press the button to download all the logs from the instrument to the screen for visualization and or exporting 7 File Open Button Press the button to recall data previously saved in a log file 8 File Save Button Press the button to save all the data downloaded from the instrument to a file for later recall and analysis A browser window appears to select the file name and location 9 Cursor Display Area This area displays the time and level at the cursor location 10 Data Source Indicator Indicates the source of the data being displayed This is either the serial number of the instrument from which the data was downloaded or the name of the file from which the data was read 11 Pan Zoom and Cursor Buttons The magnifier glass has several modes for zooming in X and Y or to go back to the full size view auto scale The hand is used for panning in X and Y The cross is used to move the cursor on the
21. re see below Slide a new battery in making sure you observe the proper polarity The positive contact of the battery outer casing of the battery should face up 7 Make sure the LED blinks rapidly for a few seconds and then at a rate of once every two seconds 8 Reposition the printed circuit board within the two half shells Make sure the button is correctly positioned 9 Make sure that the layers of foam at the end of the PC board provide a proper seal to the edge of the casing This is important to have a good frequency response 9 1 1 Reset Procedure With the battery out of the battery holder insert a small coin inside the battery compartment so that it touches the metal on both sides of the compartment Be gentle to avoid damaging the surface of the printed circuit Be certain that the coin touches both sides of the compartment otherwise the reset will not be effective 9 1 2 Battery Type A CR2032 battery should be used to power the device at all times 9 2 Cleaning Use a damp sponge or soft cloth Do not use any liquids that might enter through the microphone ports Be careful not to obstruct the microphone port or the inside of the ML connector Noise Sentry User s Manual 18 If the microphone port is obstructed open the casing see Battery Change procedure and use a small pin to clear the obstruction If the inside of the connector needs cleaning use compressed air to dislodge any debris A Do not use solvent
22. rowser The following restrictions apply e The instrument must be connected to a local computer acting as a web server and running the Noise_Sentry_Manager application e The firewall on the local computer must be set up to let remote computers access the local computer using HTTP TCP on port 8000 e The firewall on the local computer must be set up to give full access to the Noise_Sentry_Manager application as well as all appropriate runtime modules e tis not possible to save and open files remotely e The remote computer must use a web browser plug in that is distributed by National Instruments At the time of this writing the plug in supports the following platforms e Windows XP e Windows Vista e Windows 7 e Mac OSX e Linux e Not all web browsers support the plug in Examples of compatible browsers are e Microsoft Internet Explorer 8 0 e Mozzilla Firefox Noise Sentry User s Manual 15 7 6 1 Remote Access Setup on a Local Network e Install the Noise_Sentry_Manager application on the local computer e Run the application If any firewall authorization dialog appears allow the requisite accesses e Click on the Web Remote button at the top right of the application window Remote Access is only allowed when the button is pressed e f necessary make sure that the local computer s firewall is open for the TCP IP protocol on port 8000 e Note the IP address of the local computer e Opena web browser on the remote Computer t
23. s A Do not blow compressed air in the microphone ports This may damage the microphone 9 3 Software and Firmware Upgrades Software upgrades are found on our web site www convergenceinstruments com After upgrading the Noise_Sentry _Manager application if a firmware upgrade is required it will be applied automatically when the application is started 10 Troubleshooting 10 1 Cable Driver Installation If the Noise_Sentry _Manager application is unable to communicate with the Noise Sentry it may be because the MLI cable driver failed to install properly To check the cable driver installation follow the procedure below 1 Disconnect the MLI cable from the PC 2 Open the Device Manager on the PC This is usually found in Control Panel System and Maintenance 3 Open the Ports COM and LPT item on the right 4 Connect the MLI cable Make sure you are using the MLI cable for the Noise Sentry and not a standard USB cable Observe that the Device Manager window refreshes Under Ports COM and LPT verify that an item named USB Serial Port COMx has been created If not disconnect the Noise Sentry USB cable Then reinstall the software NOOO 10 2 Connection Problems Failure to communicate with the PC can also be caused by poor MLI cable contacts Make sure the MLI connector is fully inserted into the socket of the Noise Sentry Inspect the inside of the plug at the end of the cable as well as the ML socket on the unit I
24. s peak level or the integrated dose Fast and Slow sampling modes Can monitor and record acoustic levels for up to 10 days on a small coin battery Non volatile memory In case of battery failure all recorded data is preserved Noise_Sentry_Manager application to setup operating and recording parameters download visualize and export the recorded data The application can also be used to monitor acoustic levels in real time e Remote control from web browser 2 Applications e Measurement and data logging of acoustic dose e Monitoring of safe working conditions e Activity detection and recording e Long term measurement and recording of acoustic levels for environmental impact studies Warnings b Do not operate the Noise Sentry to temperatures exceeding the following limits 20 degC to 70 degC 4 degF to 158 degF Do not submerge the Noise Sentry in liquids Only use the MLI cable provided with the Noise Sentry Pee Only use the Noise Sentry as specified in this manual Noise Sentry User s Manual 3 4 Getting Started 4 1 1 Software Installation 1 Run Noise_Sentry_Installer exe This installs the Noise_Sentry_Manager application as well as its MLI cable driver and documentation Note Perform the software installation above BEFORE connecting the MLI cable into the PC 4 1 2 Hardware Installation 1 2 aR Ww 6 7 5 Connect the MLI cable into an available USB port of the P
25. th the Noise Sentry 7 2 Main Functions The application has three main tabs e The Setup Tab Is used to setup the instrument and read current levels and ongoing statistics see figure 3 e The Log Tab Is used to read display and export the data from the Noise Sentry see figure 4 e The Frequency Tab Is used to display a real time frequency spectrum of the acoustic signal see figure 5 7 3 Setup Tab The setup tab is seen in figure 3 The setup tab is divided into seven fields 7 3 1 Time and Date Field This field displays the internal time of the unit If the unit time is not properly adjusted press Synchronize This synchronizes precisely the unit time to the PC time Make sure the PC time is accurate before synchronizing the unit Note Time synchronization is not allowed while the unit is recording Attempting to synchronize the time while a recording is in progress will trigger an error message to that effect 7 3 2 Recording Setup Field Check boxes to the left of the recording setup field allow the user to select which measurements to record The Recording Depth bar provides two indications e The percentage of memory already used e The total memory capacity in Days Hours Minutes The total memory capacity is calculated as a function of the number of selected measurements and the log interval The Log Interval can be adjusted in Hours Minutes Seconds Note All these adjustments are only effective whe
26. urements over the specified Log Interval At the end of each interval the selected statistics are written into solid state memory The statistics are then cleared to zero and the next measurement interval is started The statistics that can be recorded are Max acoustic level e Average acoustic level Equivalent Level or Acoustic Dose e Min acoustic level For instance if the Log Interval is set to 1 min and the Max and Average acoustic levels are selected then each point in the log indicates the Max and Average acoustic levels measured over the preceding 1 min The Log Interval is adjustable in 1 second increments from 1s to 12H Noise Sentry User s Manual 6 The Noise Seniry has a total combined recording depth of 52 000 points For instance it can record 52 000 average acoustic levels or 17 300 combined min max and average levels Each time the recording is started using the Noise_Sentry _Manager application or the multi function button a new log is created Each log extends from the time the recording is started to the time it is stopped Logs are stored sequentially in the recording memory Each log can be setup to record different statistics and for a different interval sampling mode and weighting function For instance a first log can be created containing max dB A levels every second for 10 minutes Then a second log can be created containing min max and average dB C levels every hour for 3 days The Noise_Sentry _ Manager
Download Pdf Manuals
Related Search