CK:261S Vehicle Noise Measurement Kit with PTB Type Approval
The CK:261S is a complete noise measurement kit containing a Class 1 Sound Level Meter that has been designed to meet the requirements of ISO 5130-1982 & §29 StVZO for the noise testing of motor vehicles. Designed to be used in workshops, garages and test laboratories alike, the CR:261S is a robust instrument that is simple to operate whilst providing the measurements needed.
The CR:261S has been specifically designed to be used for vehicle noise measurements. In this application, the most commonly used measurement is the maximum sound level, or LAFmax. The instrument has two operating modes.
This is when the CR:261S is used without the remote control. In this mode, the display shows the current sound level, LAF, and the maximum sound level, LAFmax, recorded.
Remote Control Mode
The second measurement mode uses the remote control to start and stop the measurements. With the remote control unit, ZL:261S, the noise tests can be carried out quickly and comfortably by one person alone - with a single button.
When the remote control is pressed, the instrument will measure and record the LAFmax value. This mode allows noise measurements to be made in accordance with the requirements of ISO 5130:2007 as well as §29 StVZO.
The last three LAFmax measurements are displayed on the screen allowing the user to safely operate or monitor the vehicle under test whilst making the noise measurements.
Measurements to ISO 5130:2007
ISO 5130:2007 requires three consecutive measurements to ensure repeatability.
These measurements are taken at a specified engine speed, or RPM, and the maximum sound level produced during the test is taken. Once three valid measurements have been made, the highest is taken and used as the valid result.
The microphone can be placed at the specified measurement position, typically 45 degress and 0.5m from the exhaust of the vehicle under test. The CK:261S Measurement Kit includes a positioning template which can be used to ensure that the microphone capsule is set at the correct angle and distance from the vehicle exhaust.
The tripod included with the kit allows the sound level meter and microphone to be set at the correct height from the ground. The remote control allows the user to control the measurements whilst ensuring that the engine is at the correct RPM for the test.
The CR:261S can be supplied with a range of accessories and optional extras that allow the instrument to be used for various different applications.
PTB Type Approval to IEC 61672
The CR:261S is the first Cirrus Research plc Sound Level Meter to carry full PTB Type Approval to the latest IEC 61672 Standard for Sound Level Meters.
The approval is to DIN EN 61672-1:2002-10 and DIN EN 61672-2:2003-08 and the PTB reference number is PTB-1.72-4025043.
DIN EN 61672 is the same as IEC 61672 and is the latest standard for sound level meters.
The CR:261S Sound Level Meter is usually supplied as part of the CK:261S Vehicle Noise Measurement Kit. Containing the Sound Level Meter and a full range of accessories, the CK:261S Kit is the ideal tool for the measurement of noise according to ISO 5130 and §29 StVZO.
The CK:261S Measurement Kit contains the following items:
- CR:261S Class 1 Vehicle Noise Sound Level Meter
- CR:515 Class 1 Acoustic Calibrator
- UA:237 Windshield
- CK:261 Carrying Case
- ZL:261S Remote Control
- User Manual & Certificates of Calibration
- Tape Measure & Positioning Template
- CT:4 Tripod
The CK:261S can also be specified with the CR:511F Acoustic Calibrator and the CR:590 Reference Barometer which carry PTB Type Approval to IEC 60942:1988.
The measurement kit includes a Tripod to allow the microphone to be positioned at the correct height along with an alignment tool to position the microphone at the correct angle to the exhaust.
A tape measure is also provided to ensure that the vehicle under test is positioned away from data[i]ects as specified by ISO 5130:1982.
Find out more
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