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CASELLA USA 

 

 

 

CEL-240 DIGITAL SOUND LEVEL METER 
FREQUENTLY ASKED QUESTIONS

 

 

Casella USA 

Page 1 of 6 

(800) 366-2966 

31 Jan 2008 

[email protected]

 

CEL 240 Series 

Digital Sound Level Meter 

 

Frequently Asked Questions 

 

Casella  USA  is  proud  to  announce  the  CEL-240  sound  level  meter.  These 
FAQ’s  help  to  give  an  overview  of  the  current  models,  answer  some  of  the 
more typical questions that arise and describe how they fit into the overall CEL 
product portfolio of noise measurement instruments. 
 

INTRODUCTION 

How does the instrument fit into the CEL range? 

 

COMPARISON OF MODELS 

What models are there in the range? 
What are the main features & benefits of the CEL-240? 

 

OPERATION 

How long will standard alkaline batteries last in a CEL-240? 
Can rechargeable batteries be used in a CEL-240? 
How can the instrument be powered from an external source? 
Can the microphone of a CEL-240 be removed? 
Can the CEL-240 be used for outdoor measurements? 
How quickly does the digital display update during measurements? 
Is the time history trace stored in the CEL-240? 
What outputs are available from the CEL-240? 
What are the characteristics of the ac output? 
What are the characteristics of the dc signal? 
What are the characteristics of the digital output? 

 

INSTRUMENT FUNCTIONS 

What measurement ranges does the CEL-240 cover? 
What results can be measured in a CEL-240? 
What rms frequency weightings are available in the CEL-240? 
What time weightings are available in the CEL-240? 
What exchange rates or Q values are available in the CEL-240? 
How do I calibrate the CEL-240? 

 

ACCCURACY & RESULTS 

What accuracy is the instrument designed to fulfil? 
Are any results saved when using the SLM mode? 

 

APPLICATIONS 

What markets is the instrument designed for? 
How are these markets catered for by the CEL-240? 

 

 

CEL-240 

 

“EZ does it” 

Summary of Contents for CEL 240 Series

Page 1: ...trument be powered from an external source Can the microphone of a CEL 240 be removed Can the CEL 240 be used for outdoor measurements How quickly does the digital display update during measurements Is the time history trace stored in the CEL 240 What outputs are available from the CEL 240 What are the characteristics of the ac output What are the characteristics of the dc signal What are the char...

Page 2: ...vice versa Both models feature ANSI type 2 accuracy for overall measurements The new CEL 350 dBadge dosimeter adds a small badge style dosimeter with cable less microphone to the range for added convenience CEL 400 Series The mid range sound level meters are the CEL 430 450 and 490 providing recording of level against time or level against frequency The 450 and 490 instruments are fitted with para...

Page 3: ...s are recommended for longest running time Can rechargeable batteries be used in a CEL 240 A set of 3 x AA NiMH rechargeable batteries can be used instead of alkaline batteries and battery life will be around the same time at normal room temperature The rechargeable batteries will operate successfully down to lower temperatures than an alkaline battery set NiMH batteries must be recharged outside ...

Page 4: ... The C setting is recommended for making audio recordings since it has a better wider and flatter frequency response than the A weighting The ac signal is available on the 2 5 mm jack socket at a level of up to 0 85 V rms for full scale deflection This means that for a sound level of 100 dB measured on the Lo range of the meter the output would be 0 85 V rms A signal at half the range FSD would ou...

Page 5: ...er to see what is happening Use the Fast response to more accurately follow the changing noise levels as they rise and fall Use the Impulse response only when the regulations require it What exchange rates or Q values are available in the CEL 240 There is no specific exchange rate available in the meters since this function is only associated with instruments that can measure the time average nois...

Page 6: ... with a personal computer running the optional dB24 software FAQ s APPLICATIONS What markets is the instrument designed for There are three main markets for the CEL 240 a simple meter for monitoring noise exposure in the workplace a general purpose sound level meter for many environmental nuisance sources a short term noise meter for quick measurements on specific noise sources How are these marke...

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