Casella-cel CEL-368 Manual de usuario

CEL-268 - Type 1& CEL-368 - Type 2Environmental Noise MetersOperator's Handbook060155Issue: 2Sept 1993archive DocumentforDiscontinued Instrum

1.5 Use With Current SettingsThe SETUP screen shows the current meas-urement parameters.Either: Change measurement settings as de-tailed in Section 1.

1.6 Checking/DeletingMemory ContentsWhen it is required to inspect the memory, orto delete the contents of one or more stores tomake space for a new l

Move the reverse video cursor to the requiredoption on the SETUP menu, then pressto implement the choice.The parameters that can be set from this menu

Event ON/OFFUse the EVENT option to display the EVENTmenu that allows the event mode to be acti-vated.Some measurement procedures specify thatonly sou

SETUP menu and TIMER will now be shown ON.1.8 Instrument ParametersPress .to display the OPTIONS menu thatgives access to the instrument parameters.Mo

Use the SET CLOCK option to display theCLOCK menu.The clock operates only in 24 hour mode withthe day and month in the order shown.Use and to step fro

If ON is selected, a warning menu is displayed.Only when the conditions are correct, follow the instruction and pressto switch the voltage ON.A final

Results can be accessed at any time by press-ing , EXCEPT during the self-verificationand calibration sequences, or while the instru-ment is logging d

1.12 Read Event ResultsEvent results can be accessed at any time, ex-cept during the self-test and calibration se-quences, by pressing .When the instr

Use and to move the plot sideways across the display to seethe whole of long profiles.Use to step forward through events and display the profiles save

field then use to change the indicated number as required.When graphcal printout is required, use the SET GRAPH option to ob-tain the SET GRAPH menu.T

2. INTRODUCTIONThe CEL-268 and CEL-368 Environmental Noise Meters are the first ina new generation of CEL logging sound level meters designed for envi

and the combined1⁄4" microphone and preamplifier unit on the Type 2CEL-368. They accept the CEL-3025 Vibration Attachment connectedvia a CEL-225/

All results are stored in digital form and are available for downloading toan industry standard personal computer (PC) for further analysis, datamanip

When the period profile option is activated, depending on the period set,up to four profiles may also be stored (but cannot be shown on the in-strumen

3. SCHEDULE OF PARTSA complete "CEL-268 Environmental Noise Meter" consists of the follow-ing items:CEL-268 Type 1 Environmental Noise Meter

legislation on recycling states that this packaging must be retained forre-use or be recycled in the locally approved manner). Any instrumentreturned

These instruments are also available as part of several complete meas-urement kits. Please contact your CEL representative for details.CEL-268/368 Ope

4. DESCRIPTION4.1 Store AllocationBoth CEL-268 and CEL-368 have a non-volatile data memory to keepresults safe even while the instrument is switched O

In practice, the main limitations on cumulative duration will be manuallytiming an interval shorter than one minute, or the availability of sufficient

Contents Page1. SIMPLIFIED ROUTINE OPERATIONS ... 11.1 Installing The Microphone ... 21.2 Loading Batteries ... 31.3 Switching ON/O

in addition, a profiling option can be activated to store up to four periodprofiles.The following period information is determined and will be stored

• Whether overload occurred during the profile,• Whether the battery volts fell below 3.6 V during the profile.Event:In event mode, events that exceed

• Whether 200 Pa level was exceeded during the event(70 - 140 dB range only),• Whether overload occurred during the event,• Whether the battery volts

The most obvious difference between the Type 1 CEL-268 and Type 2CEL-368 is in the microphones and preamplifiers used.CEL-268 - Type 1The standard mic

put signals can be accepted from other sources for example the CEL-3025 mentioned above, and when a CEL-216 Line Adaptor is used, ACinput signals with

As can be seen from the block diagram (Figure 2), the preamplifier inputin both instruments can be switched to pass to the wide range RMS de-tector th

Both clock and RAM are also powered by an additional back-up battery,so that neither time information nor memory contents are lost when themain batter

Pause activity,Current operating mode,Sound levels,Signal overload,Battery voltage.Both AC and DC analog output signals proportional to the indicated

If the first active time is a stop (end) time, the instrument will start log-ging data immediately and stop logging when the stop time is reached.Howe

The main power control for the instrument, it is used only toswitch power ON and OFF.When first switched ON, the instrument runs a self test routine,a

Contents Page4.8 Control Keys ...374.9 Analog Outputs ...394.10 Analog Input ...404.11 Batteries & Auxiliary Po

Changes the choices indicated within the marked field to obtainavailable option, or actions a highlighted selection in the sameway as the "Enter&

C6605/2 AC Output Cable to Sony TCD D10 Digital AudioTape (DAT) Recorder (2 m), includes eventtriggering for suitably modified DAT hand units,Consult

must be removed from the instrument for recharg-ing.Rechargeable nickel cadmium cells may be employed, but have ashorter operating period. Zinc carbon

Figure 5: External view of 18-lineauxiliary socket930001123456789101112131415161718Pin NoUse1→ Event Active2 Unused3→ AC Out4 0 V Ground5→ +5 V6← Ext

5. PRELIMINARY OPERATIONSTo prepare the instrument for operation, it is necessary only to connectthe relevant microphone and preamplifier and install

Warning !Polarizing voltage must be OFF to prevent damagewhen the MK-250 is used.The MK-2501⁄2" Electret Microphone can be fitted if the CEL-268

achieved by mounting the microphone and preamplifier on a CEL-4627Tripod and connecting them to the instrument by plugging in to one endof a CEL-4493/

For example, the C6593/1 Cable (1 m) plugs into a cigar lighter socketand can be used to power the instrument from an ordinary car battery.5.3 Switchi

3. With the CEL-368 and CEL-282,carefully fit the CEL-4725 Microphone Coupler supplied withcalibrator over the end of the microphone/preamplifier unit

Current (Measured) SoundLevelCEL-268/368 Operator's Handbook - Page 45

1. SIMPLIFIED ROUTINE OPERATIONSIt is not necessary to set up the CEL-268& CEL-368 each time they are used !The last used settings are retained, e

Reverse Video CursorIndicates Selected ItemMeasurement RangeExchange Rate for LAvgTime WeightingFrequency WeightingLogging Period (Interval)User Defin

CEL-268/368 Operator's Handbook - Page 47

6. ROUTINE OPERATIONS6.1 Use With Current SettingsWhen has been pressed to avoid recalibration or after a field ac-curacy check has been completed (Se

2. If this message is displayed, press to display the OPTIONSmenu, then delete data from the stores as described in Section6.2 - Checking/Deleting Mem

When the specified time is reached the instrument starts to storedata, and the status display changes to RUN to indicate that theinstrument is now run

5. To restart logging, press again.6. Logging can be stopped whenever necessary by pressing .If the timer is set (i.e. SETUP menu shows TIMER ON) and

2. Use and to step to MEM. USE.3. Press to display the current MEMORY USE menu.4. Either: Press to leave the MEMORY USE menu withoutdisplaying the MEM

5. Either: When important data in some stores data must be saved,use and to move the cursor to specify which indi-vidual store is to have its contents

MEM. USE Shows the amount and store identity of memoryin use, see Section 6.2.MEM. DEL Allows store contents to be deleted, seeSection 6.2.PRINT Print

3. Press to step through the options available for the digit tochange the displayed value as required.4. When the required time and date are correctly

No further logging cantake place until the con-tents of at least onestore have been deletedto make room.Operating ModesThese instruments canoperate in

Set Pol.*Warning !DO NOT connect the 200 V polarisation supply to anelectret microphone - DAMAGE WILL OCCUR.The 200 V polarizing voltage used with con

4. Press to proceed to the status display with the new setting.6.4 Setting Measurement ParametersMeasurement parameters are accessed via the SETUP men

Time WeightingFast or Slow,Q (Exchange Rate)4, 5, 6,or " - " when no average is being calculated,(Q=3 will never appear on the display, but

The length of the cumulative period (logging run over whichresults are accumulated) is independent of the interval set forperiod measurement. It is de

RUNPAUSERUNPAUSERUNPAUSETIMER ONFirst active time is STOPSTOPRUNPAUSETIMER ONFirst active time is RUNFollowed by active STOPWAITRUN STOPRUNPAUSETIMER

Run 4Run 3Run 2RUNPAUSEStandard Delays& Cumulative RunWAITRUN STOPTimeLoggingUp to23 h: 59 m1mto24 hRUNPAUSEWAITRUN 1 m930011TimeWAITRUN 1STOP 1Ti

1. When automatic logging start and end times are required, use theTIMER option on the SETUP menu to display the TIMER menuwhich allows them to be spe

2. If period profiles are required, use the PROF option to display thePER. PROF (period profile) menu which allows the profile modeto be activated.Dep

30 min Period 1 m LEQ,1 m LAV,60 min Period 1 m LEQ,1 m LAV.5. Press to return to the SETUP menu with the new settings.Provided at least one profile h

2. If required, use and to select a digit in the thresholdlevel field.3. Use to set the threshold level to any value between Ø4Øand 139 dB.Similarly,

CEL-268 - Type 1Insert the CEL-225/3 Preamplifier supplied into the socket at the taperedend of the instrument, locating the unit in the keyway before

7. OBTAINING RESULTSSound measurement commences as soon as one of the STOP/PAUSE/RUN real-time status screens is displayed.Data logging will start whe

3. Press to display cumulative data.4. Use and to step either way through the storeidentities shown in the reverse video field to display results fora

2. When the instrument IS performing the self-verification or cali-bration sequences, wait for the sequence to finish, then pressto display period dat

3. Use and to step either way through the periodidentities to display the whole period profile saved in THIS store.4. When it is required to display p

4. When it is required to display event for a logging run saved inANOTHER store, press to display the cumulative results.5. Use and to step to the req

1. Display the EVENT screen as described in Section 7.4.2. Press to implement the GRAPH option shown in the lower re-verse video field.The identity of

7. Press to display events from the new store.8. Use the GRAPH option again.7.6 Downloading Data to a PrinterWhen required, a user selectable set of r

3. Press to display the OPTIONS menu.4. Use and to move the cursor to the PRINT option.5. Press to implement the option and display the PRINTmenu.All

8. Use and to move to the relevant field when it isrequired to select individual or short series of periods andeventsfor printing.9. Use to change the

Figure 10: Portion of typical cumulative printout (environmental mode)including 5 minute profile plotCEL-268/368 HandbookPage - 78

displays the current status of the data stores on a MEMORY USEscreen. This allows the user to see if there is space for the next run, orwhether the co

Figures 10 and 11 show examples of typical printouts.13. When printing is finished, the instrument retains the PRINT menu.13. Press to obtain the curr

CEL-268/368 HandbookPage - 80

8. DIGITAL INTERFACEDigital interfacing is achieved via the 18-way connector of the auxiliarysocket (illustrated in Figure 5. The following table show

Bidirectional unused pins may be set as inputs, outputs or buffered outputsfrom the central processing unit.Connect external power between pins 4 and

CEL-268/368 HandbookPage - 83

9. SPECIFICATIONCEL-268 - Type 1:Precision Sound Level Meter according to IEC 651: 1979, Type 1,Precision Integrating Sound Level Meter according to I

Measurement ranges - CEL-368:Range W'ghting Display Primary Primary PulseSetting Range Linearity Linearity RangeRange* Range Pk valuesIEC 651 IEC

Typical Instrument frequency range (within +0.5 to -3 dB)CEL-368 - Type 2:70-140 range: 9 Hz to 55 kHz,40-110 range: 9 Hz to 55 kHz,10-80 range: 9 Hz

Correction for microphone extension cable:No significant effect with CEL extension cables up to 100 m.With other cables, or for greater accuracy, cali

Lower than a reading of 30 dB(A) when tested according toIEC 651 clause 8.4.Directional response:Within the limits of IEC 651.Effect of windshield:Neg

With the CEL-368 and CEL-282, care-fully fit the CEL-4725 Microphone Cou-pler (supplied with calibrator) over theend of the microphone/preamplifieruni

LAvgAveraged Continuous Level,LmaxMaximum Level,LN4 x user set statistical levels,DUR Duration over which measurements taken,SEL Sound Exposure Level,

and <50 pF.Consult Lucas CEL about cables for use withequipment not manufactured by CEL.DC: Logarithmic signal on line 9,Nominally 49 mV/dB, not ex

0.83 kg (1.85 lb) including batteries.CEL-268/368 HandbookPage - 91

CEL-268/368 HandbookPage - 92

10. MANUFACTURERS SERVICING &WARRANTY ARRANGEMENTSIn order to ensure its rigid conformity with the requirements of the specifi-cation, the instrum

In the event of a malfunction developing during the warranty period, theinstrument should be carefully packed and returned either to CEL's locala

880030Reason for Return/Nature of Fault DateReturn InformationCustomer ReferenceCustomer NameAddressPhone No.Contact NameInstrument TypeSerial NumberI

CEL-268/368 HandbookPage - 96

STOPCALEXITEXITEXITEXIT EXIT EXITEXITNOTIMPLEMENTEDOn/OffCalibrationPERIODCUMULEVENTSet Measurement &Instrument ParametersEXITOPTIONSSCREENSTATUSC

Current Status(Real-Time)PERIODCUMULEVENTEXITSTOPCALSTOPCALSTOPCALRUNPAUSERUNPAUSETimerObtain Results930009RRUNPAUSEOPTIONSONOFFOPTIONSONOFFONOFF