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CR308 Sound Level Meter

CR308 Sound Level Meter
CR308 Sound Level Meter
CR308 Sound Level Meter CR308 Sound Level Meter Hand Held Sound Level Meter

Features

  • Calibrated Type 2 Sound Level Meter
  • Fast and Slow response
  • A and C frequency weighting
  • Back-light for darker environments
  • Min, Max and Peak measurement
  • AC and DC
  • Calibration certificate included

Applications

  • Basic noise checks
  • OSHA occupational noise checks
  • Alarm installation
  • Fire alarm testing
  • Machinery and factory noise (see notes below)

Ordering

CR308 $454.00
Sound Level Meter
CK308 $851.00
Noise Kit with CR308 Meter, CR514 Calibrator and Case
CR514 $365.00
Sound Level Calibrator
CK380 $64.00
Kit Case for CR308 Meter and Calibrator
UA30X $11.00
Windshield for CR308
CR308 Sound Level Meter
$454.00

Overview

The CR308 is an easy to use sound level meter that meets the standards to Type 2, as required by many noise measurement standards. It measures the Fast or Slow sound level with both "A" and "C" frequency weightings.

Standards

  • ANSI S1.4 and IEC 60651 to Type 2
  • IEC 61672 Class 2

It is essential that a sound level meter meets these standards if it is to be used for any important measurements, particularly those that involve any other legal purposes. The CR308 meets the strict demands of ANSI S1.4, IEC 61672 and IEC 60651 and is provided with a Calibration Certificate at no extra cost, so you can make your noise measurements with confidence.

Noise Measurements

The CR308 measures the instantaneous sound level with either A or C weighting. Most noise regulations require A weighting. It also has both Fast and Slow time response. Many regulations require Fast but some, like the US OSHA regulations use Slow as it is easier to average by eye.

The meter also provides the Maximum and Minimum readings for whichever weightings are selected. A Reset button is used to clear and start the next min/max measurement.

Outputs

An AC output and optional DC output mean this meter can be connected to a level recorder, PC equipped with an A/D converter or integrated with another data logging system.

See Specifications tab for more details about the standards and noise measurement range.

Applications for the CR308 Sound Level Meter

The CR308 is a simple hand-held sound level meter with no data logging and no additional software. As many applications require a single reading to be made, it is often easier to note it down manually that to connect to a computer and download it.

This meter is ideal for making quick sound level checks of machinery noise, office noise and other issues around the workplace. However, please read the following notes about the noise at work regulations.

Fire Alarm Testing

The standards for fire alarm testing usually demand the measurement of the "A" weighted "Fast" sound level. The CR308 sound level meter provides this measurement.

US OSHA Occupational Noise

To satisfy the OSHA occupational noise regulations, a sound level meter should meet ANSI S1.4 to Type 2 and measure the Slow, 'A' weighted Sound Level.

The CR308 meets these requirements and so is suitable for a basic occupational noise survey.

System Integration

Although not a data logging meter, the CR308 has an AC output and a DC output, making it ideal for connection to a data logging system via a suitable A/D converter.

Start Measuring

The CR308 sound level meter starts measuring noise levels as soon as it is switched on. The most common measurement is Fast, A weighted sound level, abbreviated to LAF, so this is the default reading.

sound level display
Sound Level Display

The bar at the top of the display shows the current sound level and how it fits within the range of the meter. This is most useful when viewing parameters such as Max or Min.

Keypad

Calibration Check

If the regulations require regular calibration checks then you also need the CR514 Calibrator, which is included in the CK308 Noise Measurement Kit. To check the meter's calibration you put the calibrator over the microphone, switch it on and press the Cal button. The meter makes any adjustments automatically.

CR308 Sound Meter Options

The CR308 sound level meter can be bought on its own, with a calibrator or as part of a Noise Measurement Kit (meter, calibrator, case). Please check your regulations to see whether you need a Calibrator, or contact us for advice before ordering.

Order Code CR308

  • CR308 Sound Level Meter
  • Windshield
  • Instrument Handbook
  • Batteries
  • Calibration Certificate

CK308 Noise Measurement Kit

Our noise measurement kits are designed to include all the parts needed, enclosed in a carrying case.

  • CR308 Sound Level Meter
  • Windshield
  • CR514 Class 2 Sound Level Calibrator
  • Handbooks
  • Batteries
  • Calibration Certificates for meter and calibrator

For more information about the calibrator, please visit the CR514 Sound Level Calibrator page.

CR308 Sound Level Meter Specifications

StandardsIEC 61672-1:2013 Class 2
ANSI S1.4 and IEC 60651 Type 2
Range30 dB (A) to 130 dB (A)
40 dB (C) to 130 dB (C)
Frequency weightingA and C
Time weightingFast (F) and Slow (S)
Display functionsSound level, maximum, minimum, C peak
MeasurementsLAF, LAS, LCF, LCS, LCpk
Noise floor< 25 dB (A)and 35 dB (C)
Resolution0.1 dB
Display flagsAlarm limit, overload, under-range
Auto cal. range±4.5dB
Reference point94dB (1kHz), 92.9dB (8kHz)
Settling time60s
DisplayBacklit 128×64 LCD, resolution 0.1 dB

 

Electrical inputs5V power in via mini USB
Power2 x AA/LR6 1.5V batteries
Or 5V DC via Mini USB
Battery life24 hours
Microphone1⁄2” pre-polarised electret condenser type HY:205
Operating temperature0°C to +40°C
Operating humidity25% to 90%
Atmospheric pressure65 kPa to 108kPa
Storage temperature-20°C to +60°C
Dimensions215 × 68 × 32 mm
Weight220 g (including battery)
Electrical outputsAC (Tip 3.5 mm jack) and DC (middle 3.5 mm jack)
DC outputvoltage 15mV/dB, range 450mV to 1950mV
AC outputRMS 2V