- Castle Group Ltd
Contents
1. Serial No 012345 Serial No 012345 Remove Cover f gt to change Batteries Nik NE L O 9 D Q Release the spring catch and remove the battery compartment cover Press clip remove cover attach batteries to connector replace cover firmly and close clip NOTE A built in lithium battery with a life of approximately 3 years provides back up for the instrument s real time clock and calendar and data storage A new battery will be fitted when the instrument is returned for its annual re calibration Attaching the Microphone Align the red dots on microphone and instrument grip the microphone s collar and push firmly To remove the microphone reverse this process Do not twist the microphone Pull the microphone assemb away from the instrument along it s axis Grip the knurled C B lt CASTLE CASTLE 10 Switching On and Off Press and hold the POWER button until the display illuminates Wait a few seconds while the instrument runs through its start up sequence When READY appears in the display window the instrument is ready for use To switch off press and hold the POWER button until the display goes blank Backlighting Press the LIGHT key and the display will be backlit for approximately 10 seconds Locating and Acti2. gt CRIT lt ENTER LEFT ARROW RIGHT ARROW to select criterion then ENTER to confirm 13 Metering Brief description of terms under METER SPL gives accurate values of A C or Linear weighted sound pressure level Leq provides the facility for measuring Leq LAeq or LCeq The elapsed time shows the continuous period of time for which the Leq has been accu mulating Lmax the maximum rms sound pressure level Shows the real time when Lmax was last updated and the Event time Lmin the minimum rms sound pressure level Shows the real time when Lmin was last updated and the Event time Peak the peak is continuously captured and is the measure of true Peak The measurement is a linear weighted sound pressure level and is only valid when the peak exceeds 80 dB s The event time shows the real time at which the Peak was last updated PrLep d a projection of the Lep d which is a variable dependent on the A weighted sound pressure level and the duration of exposure It is therefore only valid when A weighted RMS a flag which is only set when the A weighted SLOW response SPL exceeds 115 dBA rms Time the elapsed time which is the period of time for which the instrument has been switched on and the real time and date METER then gt lt to SPL Leq Lmax Lmin PEAK PrLep d RMS TIME ENTER LEFT ARROW to set Filter Weighting A Linear or C RIGHT ARROW to set Time Weighting Slow Fast Impulse
3. Linearity Range Dynamic Range The range may be selected manually or auto ranged settling time is 3 5 BS EN 60651 BS EN 60804 BS EN 61260 1992 Type 1 BS EN 7580 BS EN 60651 BS EN 60804 BS EN 61260 1992 Type 2 BS EN 7580 30 80 dB 50 100 dB 70 120 dB 90 140 dB 30 80 dB 50 100 dB 70 120 dB 90 140 dB 30 80 dB 50 100 dB 70 120 dB 90 140 dB 30 93 dB 50 113 dB 70 133 dB 90 143 dB 50 dB 60 dB 60 dB seconds depending on order of magnitude 27 1994 Type 1 2001 Type 1 1996 1994 Type 2 2001 Type 2 1996 Frequency weighting GA120 121 122 123 and Linear to BS EN 60651 Type 1 GA221 and Linear to BS EN 60651 2 N B The frequency range of this instrument is to type 2 standards Outside of this range precision is not assured Data for the 16kHz range should therefore be used only as a general reference Time weighting GA120 121 122 123 Slow Fast and Impulse to BS EN 60651 Type 1 GA221 Slow Fast and Impulse to BS EN 60651 Type 2 Detector Characteristics Dynamic Time Constant Characteris Decay Time f True RMS and simultaneous PEAK linear Crest factor capability 13 dB at full scale deflection Signal to Noise ratio gt 5 dB at bottom of scale EMC Performance Radiated emissions to EN 50 081 2 No significant emissions from the instrument 28 Display GA1
4. RANGE to set range 30 50 70 90 N B Once a function on this menu level has been selected ENTER will bring other functions up on screen SPL Leq Lmin Lmax PrLepd PEAK RMS TIME Setting the Print Configuration It is possible to set your Sound Level Meter to print only the parameters of a log that you want to print it is also possible to set your SLM to print all the logs in memory fully or just the summary data from all the logs gt SETUP lt ENTER gt PRINT lt ENTER access the print setup menu Set printout to Summary gt ALL lt ENTER gt SUMMARIES lt ENTER only summary data of loca tions will be printed when PRINT ALL ENTER is selected Set printout to ALL gt ALL lt ENTER gt SUMMARIES lt ENTER all data selected for loctaions will be printed when PRINT ALL ENTER is selected Setting IND printout parameters gt IND lt ENTER brings up menu of parameters of Industrial log which can be set see print options Setting ENV printout parameters gt ENV lt ENTER brings up menu of parameters of Environmental log which can be set see print options Print Options select the parameter you wish to setup e g gt LEQ lt ENTER Set selection to graphic printout gt GRAPH lt ENTER selects bar graph printout for data Set selection to text printout gt TEXT lt ENTER selects text printout for data Set selection to no printout gt OFF lt ENTER disables printout for
5. To lock the instrument have VIEW END EVENT LOCK on screen ENTER then ENTER to lock To unlock the instrument RESET ENTER RESET Clearing logging data gt LOG lt ENTER gt CLEAR lt ENTER gt LAST lt or gt ALL lt ENTER then RESET to confirm If gt CLEAR lt is selected in error press up arrow key to return to menu Using the timer gt LOG lt ENTER gt TIMER lt ENTER gt IND lt or gt ENV lt ENTER gt lt to select time interval ENTER Use numeric keys to select start time in hours minutes month and day then select end time in hours minutes month and day ENTER after each selection The timer is now set RE SET to clear The instrument will turn off if the start time is more than 32 minutes away After 32 minutes the instrument will come on for approximately 10 seconds to check the start time It will continue to do this until the start time is within 32 minutes When the start time is less than 32 minutes away the in strument will turn on in readiness to start its log To halt the timer before the start time is reached POWER RESET and the instrument will clear One Touch Logging OTL begins a log with the same parameters of the previous logging mode i e Industrial or Environmental using whichever time intervals were last used If the previous log used the TIMER new start and end parameters will have to be keyed in Positioning of user When you are taking measurements always ensure that
6. data 15 Logging Logging is performed against a choice of two sets of measurement variables Industrial and Environmental Industrial variables are SPL Leq Dose Projected Dose Dose per Hour Lmax and Peak Environmental variables are SPL Leq Lmax Lmin SEL L10 L50 or NNO which is the Night time Noise Offence and L90 Both modes also indicate elapsed TIME and INFO a reminder of logging mode time intervals numbered locations and the number of logged intervals which have been recorded Starting a log gt LOG lt ENTER gt MANUAL lt ENTER gt IND lt gt ENV lt ENTER gt lt to select time interval 1 minute 10 minutes 15 minutes 1 hour or gt USER lt to define a different time interval ENTER Logging is now underway To see the logging data gt VIEW lt to bring up a list of variables then gt lt to select ENTER Whilst viewing one variable ENTER will bring the next on screen Press up key to return to upper level Ending a log Have VIEW END EVENT LOCK on screen gt END lt ENTER gt END lt ENTER To pause logging have VIEW END EVENT LOCK on screen gt END lt ENTER gt PAUSE lt ENTER To resume or end logging gt END ENTER gt CONTINUE lt or gt END lt Alternatively use the key pressing toggles the logging status I 16 To mark events have VIEW END EVENT LOCK on screen gt EVENT lt ENTER Use numeric keys to add a number between 1 and 9
7. time date and log number are shown on the display when selecting a log to print Sample Logged Printout Logging mode Environmental A Slow Log Start 23 29 55 on 25 09 94 Log End 23 32 55 on 25 09 94 Cumulative Measurements Leq 58 L10 56 L50 50 L90 46 Lmin 38 Leq Time History 23 29 23 30 23 31 23 32 L90 L10 Time History 23 29 23 30 23 31 23 32 Time sl 951 Date 26 09 94 Location Operat Signat Factory recali tion due 15 04 95 Last user cali tion 21 16 on 25 09 94 24 Status This function shows the current status of the instrument It shows the battery strength whether the instrument is paused or running and whether an overload has occurred Three bars indicate full battery strength replace batteries when one bar is shown STATUS shows the status screen STATUS exits the status screen Auto Range Auto ranging selects the optimum range for the ambient sound field and may not be suitable for rapidly fluctuating sound pressure levels or short period measurements gt SETUP lt ENTER gt RANGE lt ENTER gt AUTO lt ENTER To de select Auto ranging gt SETUP lt ENTER gt RANGE lt ENTER gt AUTO lt ENTER Save This function saves all meter parameters e g Leq Lmin Lmax etc and waits for the unit to be turned off When the instrument is turned back on it will resume measuring from the save point gt SAVE lt ENTER Defaul
8. 20 121 122 123 GA221 Microphone Preamp GA120 121 122 123 GA221 Back lit LCD 2 x 16 character dot matrix Temperature compensated contrast LCD 2 x 16 character dot matrix Temperature compensated contrast Pre polarised 1 2 12 7mm Electret condenser Sensitivity 27 dB 1 5 dB re 1V Pa Capacitance 20 pF Impedance 10 Gohm Pre polarised 1 2 12 7mm Electret condenser Sensitivity 43 dB 2 5 dB re 1V Pa Capacitance 20 pF Impedance 10 Gohm The electrical impedance substituted for the microphone for test purposes is 560 ohms Calibration Reference level Range Tolerances 94 dB 1kHz 70 120 dB Type 1 0 7 dB Type 2 1 0 dB carried out after warm up time Acoustic reference level provided by GA601 or GA607 Temperature Effect Warm up time Operating range Warning Vibration Effect Humidity Effect Warning 0 5 dB across operating range 10 minutes 10 C to 50 C DO NOT subject the instrument to temperatures greater than 70 C or less than 20 C for any length of time From 20Hz to 1kHz at 1ms no noticeable effect 0 5 dB from 30 RH to 90 RH The instrument is NOT water resistant 29 Magnetic Field Effect Body in Free Field Effect Extension Cable Attenuation Windshield Attenuation Overload Time Memory Communication Port RS 232 Output Socket AC Output Connector Overall Dimensions Dimensions Weight Batteries Ty
9. 9 98 Last user cali tion 20 16 on 25 06 98 21 To print an octave snapshot PRINT gt SNAPSHOT lt ENTER LEFT ARROW RIGHT ARROW to select snapshot for printing then ENTER to print Note time date and snapshot number are shown on the display when selecting a snapshot to print Sample Octave Band Snapshot Octave Band Snapshot Weighting is Lin Slow Snapshot type Manual Band dB OY CO 1 OO WO 222336633 25 09 94 Location Operat Signat Factory recalibration due 15 04 95 22 To print a selected hearing protection device performance within a measured sound field first take an Octave Snapshot Then OCTAVE gt HPD lt EN TER gt SELECT lt ENTER gt lt to the required manufacturer ENTER gt lt to the required model PRINT Sample HPD Printout H P D Printout Manufacturer BILSOM Model BLUE Time 10 537 30 Date 27 09 94 Snapshot time 2225364239 Snapshot Date 25 09 94 All measurements are A weighted 1 1 1 1 2 4 6 8 0 2 4 6 0 0 0 0 0 0 0 0 BAND 63 Hz 7 125 Hz E 250 Hz EMU 500 Hz TT 1 2 KHz TT 4 KHZ TT BKHz NT Factory recalibration due 16 09 95 Last user calibration 21 16 on 25 09 94 23 To print a selected logged location PRINT gt LOGGED lt ENTER LEFT ARROW RIGHT ARROW to select logged location for printing then ENTER to print Note
10. GA120 GA121 GA122 GA123 and GA221 Professional Range of Sound Level Meters advanced stle Thank you for buying a Castle product I am sure you will find both the goods and the service to be of the highest quality but if not then please feel free to write to me personally and I will ensure that your needs are dealt with immediately This manual is designed to show you the operation of the goods you have purchased and a very brief insight into acoustics itself If you would like to become a competent person in the eyes of the law then you may like to know more about our Competent persons training course for the Noise at Work Regulations It is my intention for Castle Group Ltd to provide a complete range of Noise and Vibration products and Services of the highest standard If you would like to know more about any of our other products and services then please complete the reply paid card in this manual and return it to us for prompt action or telephone on 44 0 1723 584250 Simon Bull Sales and Marketing Director Precautions Operate the unit only as described in this manual e The Professional range are precision Sound Level Meters Protect them from shocks and vibrations Take special care not to touch the micro phone diaphragm The diaphragm is a very thin metal film which can easily be damaged e Use only the microphone preamplifier assembly supplied with your in strument e Ambient conditions for operation o
11. LOG lt SETUP LOCK Press METER Then press the right arrow METER lt gt LOG gt SPL lt Leq Press ENTER the SPL reading is shown SPL 56 8 dBA S 30ONNENEEN 80 Press the up arrow and the previous menu is METER lt gt restored LOG gt SPL lt Leq There are further keys which allow access to certain functions with one touch Their use and the use of the numeric keys will be discussed in the relevant parts of this manual Using the Manual In the course of this manual these symbols gt lt mean move the left and right arrows to move the cursor E g gt PEAK lt means move the cursor until it points to PEAK A named key written in BOLD means press that key E g ENTER means press the ENTER key Calibration The instrument should always be calibrated before use a Castle GA607 Calibrator is recommended The instrument s in built default calibration level is 94dB Switch on the instrument and attach a suitable calibrator to the microphone CAL and wait a few seconds for an SPL figure to appear Then ENTER The instrument is now calibrated If a source other than 94dB is used once CAL is in operation use the LEFT ARROW RIGHT ARROW to set a new calibration level then pro ceed as above Setting the Exchange Rate gt SETUP lt ENTER gt EXCH lt ENTER LEFT ARROW RIGHT ARROW to select exchange rate then ENTER to confirm 3dB European Standard 5dB American Standard Setting the Criterion gt SETUP lt ENTER
12. a gt YES lt gt NO lt or gt PRINT lt ENTER N B For PRINT command see separate heading If gt MANUAL lt is entered instead of gt AUTO lt band pressure levels in each octave must be allowed to settle at the user s discretion and manually accepted using ENTER before moving onto the next band To view snapshot data OCTAVE gt VIEW lt ENTER LEFT ARROW RIGHT ARROW to select an octave location then ENTER to view the frequencies in sequence Once data for the final frequency has been shown the next ENTER will show the highest reading from all frequencies The GA121 can store 40 numbered snapshots the 123 can store 50 To select a particular snapshot location gt OCTAVE lt ENTER gt VIEW lt ENTER then LEFT ARROW RIGHT ARROW to choose the required location ENTER ENTER again to view the frequencies in order To clear snapshots gt OCTAVE lt ENTER gt CLEAR lt ENTER gt LAST lt or gt ALL lt ENTER then RESET to confirm If gt CLEAR lt is selected in error UP ARROW will return the user to the menu 19 Hearing Protection Devices HPD This feature produces hearing protection analysis based on an Octave Band Snapshot Instruments with this feature contain an extensive library of specifications for many popular makes and models of HPD s Specification of models not featured can be entered using the manufacturer s data First take and log an Octave Snapshot within the sound field against which protec
13. ble Accessories GA607 GA505 ZL1082 01 ZL1090 01 KA009 005 KG205 KT102 PSU2 CPGA503 6LR61 KAO011 MW400 Software Package PCO005 Dual Level Calibrator Class 1 Portable Digital Printer 505 Printer Cable 1m Microphone Extension Cable 1m Kit Bag for SLM and Printer Shoulder Kit Bag for SLM Windshield for 2 Microphone Heavy Duty Tripod up to 1 6m high Mains Power Supply for Professional Range 505 Printer Paper pack of 5 rolls Battery Pack pack of 10 batteries Weatherproof Kit Assembly Weatherproof Microphone Housing dBdata4W Noise Windows based software plus cable 34 Warranty and After Sales Service Castle Group design and manufacture precision instruments which if treated with reasonable care and attention should provide many years of trouble free service In the event of a fault occurring during the warranty period the instrument should be returned to Castle Group Ltd in its original packaging or to an authorised agent Please enclose a clear description of the fault or symptom Details of the warranty cover are available from Castle Group Ltd or an authorised agent All instruments are designed to meet rigid British and International Standards An annual calibration is recommended to ensure that these high standards are maintained This is particularly important for cases in which instrument readings are to be used in litigation or compliance work For warra
14. ched capacitor circuit V2 L During time T1 the switch connects the input voltage across C1 which charges to V1 During T2 the switch is connected to the output and C1 discharges to V2 31 The basic switched capacitor circuit can be included in a linear integrator to form a switched capacitor integrator C1K i 1 53 m5 1 switched m capacitor integrator V1 VO The switched capacitor integrator forms the basic building block of the octave band switched capacitor filter The centre frequency of each octave band filter is deter mined by the clock frequency The switched capacitor octave band filter requires a clock frequency of approximately 54 times the centre frequency of the octave band selected Octave Band Centre Frequency Clock Frequency 31 Hz 1 7 kHz 63 Hz 3 38 kHz 125 Hz 6 75 kHz 250 Hz 13 5 kHz 500 Hz 27 0 kHz 1 kHz 54 0 kHz 2 kHz 108 kHz 4 kHz 216 kHz 8 kHz 432 kHz 16 kHz 864 kHz Base Ten The base ten system was used to determine the octave band frequency ratio G 10 3 The centre frequencies are calculated using the following formula fm G fr fm is the required centre frequency fr is the reference frequency of 1000 Hz x is an integer positive negative or zero b is one 32 Octave Reference Levels Level Range 50 100 dB Input Signal 94 dB Reference Attenuation for all octave bands is 0 3 dB 33 Availa
15. f the unit are as follows temperature range 10 C to 50 C relative humidity 30 to 90 e Protect the unit from water dust extreme temperatures humidity and di rect sunlight during storage and use Also keep the unit away from air with high salt or sulphur content gases and stored chemicals e Always turn the unit off after use Remove the batteries from the unit if it is not to be used for a long time a week or more When disconnecting cables always grasp the plug and do not pull the cable Clean the unit only by wiping it with a soft dry cloth or when necessary with a cloth lightly moistened with water Do not use any solvents cleaning alcohol or chemical cleaning agents e Take care that no conductive objects such as wire metal scraps conduc tive plastics etc can get into the unit Do not try to disassemble or alter the unit otherwise type certification will become invalid In case of an apparent malfunction do not attempt any repairs Note the condition of the unit clearly and contact the supplier or Castle Group direct To ensure continued precision have the unit checked and serviced at regular intervals e When using the unit for commercial purposes or for certification official certification is required at least once a year Contact the supplier or an authorised Castle service agent CONTENTS TITLE Instrument Introduction and Features Battery Installation Attaching the Microphone Switching On a
16. ith exception of the Octave Band Modes and offers an unbeatable combination of sophisticated technology with remarkable value for money The GA120 is the most basic instrument in the range but it still offers every facility for simple accurate environmental sound measurement and a level of sophistication not offered by any other manufacture at this price level The following features are common to the GA120 GA122 and GA123 unless stated otherwise Back lit LCD e Real Time and Date e Auto Ranging e Event Markers e Long Battery Life e Video Style Timer A C and Lin e Hearing Protection Selection e RS232 Interface e Dat Recorder Compatible e Octave Band Analysis GA123 only 7 GA221 GA120 GA121 GAI22 GA123 BER NEN Tj ges ay 000 EN mn 0 T ENS Battery Installation Use 3 high capacity 9V batteries Type 6LR61 The instrument will function with one or two batteries but with a reduced running time Do not use re chargeable batteries When BATTERY LOW appears in the display window replace all batteries as soon as possible otherwise the instrument s specifica tion cannot be guaranteed rm
17. nd Off Backlighting Locating and Activating Functions Using the Manual Calibration Setting the Exchange Rate Setting the Criterion Metering Setting the Print Configuration Logging Locking and Unlocking the Instrument Communicating with the PC Taking an Octave Band Snapshot PAGE NO 6 9 10 11 11 11 13 13 13 13 14 15 16 18 18 19 CONTENTS TITLE Hearing Protection Devices HPD Printing Status Auto Range Save Defaults Settings Setting the Real Time Clock Setting the Real Time Calendar Technical Information Technical Specification Available Accessories Warranty and After Sales Service PAGE NO 20 21 25 25 25 25 25 25 26 27 34 35 Instrument Introduction and Features This manual contains complete operating instructions for models GA120 121 122 123 and 221 Read it carefully and you will quickly become famil iar with your instrument If you have problems with the operation of any model please call 01723 584250 The professional range of instruments are designed for two specific areas Industrial and Environmental noise measurement The Industrial range comprises the GA121 which is a Type 1 Precision Inte grating Sound Level Meter The ideal instrument for industrial and environ mental applications featuring the unique automatic octave snapshot and HPD library In addition to the GA121 there is the GA221 Type 2 Integrating Octave Sound Le
18. nty and service return to The Service Department Castle Group Ltd Salter Road Cayton Low Road Industrial Estate Scarborough North Yorkshire 307 Telephone UK 01723 584250 INT 44 1723 584250 Fax UK 01723 583728 INT 44 1723 583728 Any misuse or unauthorised repairs will invalidate the warranty Damage caused by faulty or leaking batteries is not covered by the warranty 35 Notes H Research amp Development Manuals Professional Range manual 36 HB 0121 014 A5 Issue C
19. pe Life No noticeable effect No noticeable effect for 10m cable 1 dB below 12kHz 0 2 dB Positive overload warning when the input circuits saturate Battery backed Real Time clock and calendar Battery backed 1 Mbit RAM 512 Kbit ROM 2400 baud 8 bit no parity 2 stop bits Standard interface to GA505 digital printer 375mV rms at fsd into 600ohm load Short circuit protected LEMO FGGOB307CLAD52Z 280mm x 80mm x 40mm approx 900g inc batteries 3 x 6LR61 PP3 9V alkaline cells 30 hours continuous use approx based upon comparative bench tests with other batteries Use of the back light will reduce the effective battery life 30 Default Settings Criterion Exchange rate Frequency weighting Time weighting Range Reference direction of incidence Octave Band Filters Centre frequencies GA121 123 GA221 90 dB 3 dB A weighted Slow Auto ranges on start up Zero degrees about the axis of the microphone capsule 31 5Hz 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz 16kHz 31 5Hz 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz The octave band filters are implemented by a switched capacitor filter Switched Capacitor Filter Theory The basic principle behind the switched capacitor filter is the fact that a sim ple circuit based around a single capacitor can be used to reproduce the characteristics of a resistor T1 qr clock 1 E E Lt A basic swit
20. t Settings This function returns the meter to its factory set defaults Setting the Real Time Clock gt SETUP lt ENTER gt TIME lt ENTER Use numeric keys to type hours in 24 hour clock method ENTER Use numeric keys to type minutes ENTER Setting the Real Time Calendar gt SETUP lt ENTER gt DATE lt ENTER Use numeric keys to type in year ENTER Use numeric keys to type in month ENTER Use numeric keys to type in date ENTER 25 Technical Information The instrument is equipped with a seven pin LEMO socket which provides an RS 232 communication port an AC output and a power input MEE RS 232 Handshaking Line Aux power input 6V 9VDC 7 AC output 375mV rms at f s d into 600 ohms GND Rx Tx CTS BAT AC NOT USED Seven Pin LEMO socket The RS 232 communication port will directly interface the Castle GA505 digital printer via a ZL1082 01 cable The AC output is a representation of the sound pressure level incident on the microphone This output can be used in conjunction with a tape recorder to log information for FFT analysis The BAT and GND inputs provide a direct connection to the battery terminals An auxiliary power supply can be connected via the LEMO socket to provide extended running times 26 Technical Specification Standards GA120 121 122 123 GA221 Measuring Range A weighting C weighting LIN weighting Pulse Range Primary Indicator Range
21. tion is required see previous section If the snapshot was taken on a filter weighting other than that of A i e LIN or the instrument calculates the approximate A weighted levels in each octave gt HPD lt ENTER gt SELECT lt ENTER gt lt to select manufacturers ENTER gt lt to select models ENTER To define a Hearing Protection Specification for a device which is not in the instrument s memory gt HPD lt ENTER gt DEFINE lt ENTER Do the following actions for each octave band frequency gt lt to select frequency ENTER key in the Linear attenuation x 10 dB for the chosen octave band according to the manufac turer s data ENTER e g if the attenuation is quoted as 15 6dB at 1KHz then enter 156 when prompted for the desired attenuation at KHz This information will now appear on the list of manufacturers see above under gt USER lt 20 Printing Instruments should be connected to a 505 digital printer using ZL1082 01 printer cable PRINT gt SUMMARY lt ENTER produces this printout Sample Summary Printout summary Printout Time 2 00 55 51 Date 26 09 94 Weighting is A Slow Elapsed Time 02 34 04 Leq 70 0 dl Lmin 54 3 dl B 2255502 Lmax 90 8 dl t 22 55 40 Peak 97 9 dl t 22 55 40 Projected Lepd 70 0 dB Overload Flag not set 115 dBA RMS flag not exceeded Location Operat Signa Factory recali tion due 01 0
22. vating Functions Castle instruments operate with a menu system To select from the menu press the left or right arrow buttons from the central cluster until two arrows in the display the cursor point to your desired function Then press ENTER E g Press METER READY V2 0 lt gt gt LOG lt SETUP LOCK The cursor points to LOG METER lt e gt gt LOG lt SPL Leq Press the right arrow twice The cursor points to Leq METER lt gt LOG SPL gt Leq lt Press ENTER to select Leq This symbol lt gt in the top right hand corner of the display shows that there are more functions in that menu than will fit onto the screen Pressing the left or right arrow buttons will scroll the screen in either direction one function at a time until the one you are seeking moves into view 11 Eg Press the up arrow READY V2 0 lt gt gt LOG lt SETUP LOCK Press METER METER lt gt gt LOG lt SPL Leq The cursor points to SPL press the right METER lt gt arrow twice LOG SPL gt Leq lt Press the left arrow twice the cursor points METER lt gt to TIME gt TIME lt Press the left arrow until the cursor points METER lt to Leq LOG SPL gt Leq lt Pressing the ENTER key has two functions One is to activate a procedure the other is to move the operating procedure down onto the next menu level To move back onto previous menu levels press the up arrow Press the up arrow READY V2 0 lt gt gt
23. vel Meter This unit is manufactured to the less demanding Type 2 standards for economy but still retaining all the features of the GA121 except the back light function of the LCD The following features are common to both the GA121 and GA221 unless stated otherwise e Unique Hearing Protection Data file e Data Logging e Alpha Numeric Print Out e Automatic Octave Scan RS232 interface e Auto Ranging e Real Time amp Date e Auto Calibration e Back Lit LCD GA121 only e Long Battery Life The Environmental range comprises the 120 GA122 and the 123 which are all Type 1 Precision Integrating Sound Level Meters The ideal instruments for environmental applications The GA123 is the top of the range model and in addition to its comprehen sive environmental capabilities it features the unique Octave Band Mode facilities The first mode an Automatic Snapshot plot determines noise levels in octave bands for storage in memory for computer down loading or direct print out The second mode enables the same data to be recorded Manually and either set of results may be processed in the third HPD Hearing Protection Data mode enabling the values to be compared to the attenuation capabilities of up to 500 Hearing Protectors in the instrument s own library making the daunting task of product selection as simple as pos sible The GA123 also has 10 assignable event markers The GA122 has all the facilities found on the GA123 w
24. you hold the meter with the microphone attached away from your body to avoid any reflections from your body 17 Locking and Unlocking the Instrument Locking the instrument prevents unwanted keypresses from altering settings if the instrument is logging in an area where this is likely A specific key sequence unlocks the instrument To lock the instrument gt LOCK lt ENTER ENTER To unlock the instrument RESET ENTER RESET Communicating with the PC To use this facility a licensed copy of dBdata for Windows must have been purchased First ensure that data has been stored on the instrument either in the form of logged data or octave snapshots Then connect the instru ment to the PC with the appropriate 2 meter length Castle ZL1101 2 cable not to be confused with the Castle ZL1082 01 1 meter printer cable To allow the instrument to communicate with the PC gt LOG lt ENTER LEFT ARROW gt COMPUTER lt ENTER For more detailed informa tion on dBdata refer to your user manual Taking an Octave Band Snapshot This function involves taking and logging a band pressure level in each octave to determine the relative frequency content of a particular sound field OCTAVE gt SNAPSHOT lt ENTER gt LIN lt gt A lt or gt C lt ENTER gt AUTO lt ENTER The snapshot process takes approximately 1 minute 45 seconds On completion of the process all the instruments except the GA221 ask if you wish to log or print the dat
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