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Center 2250, Instruction Manual, Page: 2 / 16

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  Title                                                                                    Page 

 
 

  I.  Safety Information……..………………1 

 

   

II. 

         

General Description……..…………….2   

       

         

III. 

         

Specifications…..……………………….2  

         

   

IV. 

       

Name And Functions…..………….….5 

               

V. 

       

Calibration Procedures….……………9 

       

       

VI

 

.

 

         

Measurement Preparatio.n………..10 

       

   

VII. 

       

Operating Precautions…….………..11 

     

         

VIII. 

         

Measurement…..………………….…..12 

Summary of Contents for 2250

Page 1: ...Center Technology Corporation 320 SOUND LEVEL METER ...

Page 2: ...e Page I Safety Information 1 II General Description 2 III Specifications 2 IV Name And Functions 5 V Calibration Procedures 9 VI Measurement Preparatio n 10 VII Operating Precautions 11 VIII Measurement 12 ...

Page 3: ... conditions Altitude up to 2000 meters Relatively humidity 90 max Operation Ambient 0 40 Maintenance Clearing Repairs or servicing not covered in this manual should only be performed by qualified personnel Periodically wipe the case with a dry cloth Do not use abrasives or solvents on this instruments Safety symbols Meter is protected throughout by double insulation or reinforced insulation When s...

Page 4: ...y offices and sound quality control in various environments R Ranges from 30dB to 130dB at frequencies between 31 5Hz and 8 KHz R Display with 0 1dB steps on a 4 digits LCD R With two equivalent weighted sound pressure levels A and C R Both AC and DC signals output is available from Both standard 3 5mm coaxial socket suitable for a frequency analyzer level recorder FFT analyzer graphic recorder et...

Page 5: ...0 dB Alarm function OVER is show when input is more than upper limit of range UNDER is show when input is Less than lower limit of range MAX MIN hold Hold readings the Maximum and Minimum Value AC output 1 Vrms at FS full scale output impedance Approx 50Ω FS means the upper limit of each level range DC output 10mV dB output impedance approx 100Ω Power supply One 9V battery 006P or IEC 6F22 or NEDA...

Page 6: ... Internal Diameter 1 35mm Operation temperature 0 to 40 32 to 104 Operation humidity 10 to 90 RH Storage temperature 10 to 60 14 to 140 Storage humidity 10 to 75 RH Dimensions 275 L 64 W 30 H mm 10 8 L 2 5 W 1 2 H inch Weight 275g including battery Accessories 9V battery carrying case Screwdriver Instruction manual Windscreen 3 5ψ plug ...

Page 7: ...5 SOUND LEVEL METER IV Name And Functions ...

Page 8: ... in front of the microphone Display SYMBOL FUNCTION LCD 4 digits MAX Maximum Value hold MIN Minimum Value hold Over range Under range FAST Fast response SLOW Slow response dBA A Weighting dBC C Weighting Range Indicate Low Battery Under range 20dB Power Switch the I key turns the sound level meter ON or OFF ...

Page 9: ... change sound level range or change A C weight the MAX MIN mode will clear Sampling rate 160ms Level range control switch Each time the UP switch V is pressed The level range increments from Lo Level to Hi Level range Each time the DOWN switch W is pressed The range decreases from Hi Level to Lo Level range Frequency Weighting select switch A A Weighting for general sound level measurements C C We...

Page 10: ...n adjustment AC output terminal 1 Vrms Corresponding to each range step Output impedance 50Ω Output signal by standard 3 5mm coaxial socket signal on pin 11 DC output terminal Output 10mV dB Output impedance 100Ω Output signal by standard 3 5mm coaxial socket signal on pin 12 External DC 9V power supply terminal For connection with AC adapter 13 Tripod mounting screw Signal Ground ...

Page 11: ...9 14 Battery Cover SOUND LEVEL METER V Calibration Procedures Using a standard Acoustic Calibrator 94dB 1KHz Sine wave Acoustic Calibrator Screwdriver ...

Page 12: ...t The level display will indicate the desired level Our products are all well calibrated before shipment Recommended Recalibration cycle 1 year VI Measurement Preparation 1 Battery Loading Remove the battery cover on the back and put in one 9V Battery 2 Battery Replacement When the battery voltage drops below the operating voltage mark appears If it appears battery should be replaced with new one ...

Page 13: ... extension cable to separate the Microphone from the main body so that the effect of unexpected sound reflection can be eliminated 3 Calibrate the instrument before operation if the instrument was not in use for a long time or operated at bad environment 4 Do not store or operate the instrument at high temperature and high humidity environment 5 Keep microphone dry and avoid severe vibration 6 Ple...

Page 14: ... and C weighting for measuring sound level of acoustic material 3 Select desired Level 4 Hold the instrument comfortably in hand or fix on tripod and point the microphone at the suspected noise source the sound pressure level will be displayed 5 When MAX MIN maximum minimum hold mode is chosen The instrument captures and holds the maximum and minimum noise level for a long period using any of the ...

Page 15: ...13 ...

Page 16: ...4 F NO 415 Jung Jeng Rd 238 Shu Lin Chien Taipei Taiwan E Mail center centertek com http www centertek com 320 01 CENTER TECHNOLOGY CORP ...

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