Cirrus CR:514 Bedienungsanleitung

Instrument

Handbook

CR:514 & CR:515

Single-Level Acoustic

Calibrator

Page 2 CR:514 & CR:515 Acoustic Calibrator User Manual

The content of this manual, any illustrations, technical information and descriptions within this document

were correct at the time of going to print. Cirrus Research plc reserves the right to make any changes

necessary, without notice, in line with the policy of continuing product development and improvement.

No part of this publication may be duplicated, reprinted, stored in a data processing system or transmitted

by electronic, mechanical, photographic or other means, or recorded, translated, edited, abridged or

expanded without the prior written consent of Cirrus Research plc.

No liability is accepted for any inaccuracies or omissions in this manual, although due care has been taken

to ensure that is it complete and accurate as possible.

Accessories supplied by Cirrus Research plc have been designed for use with the instrumentation

manufactured by Cirrus Research plc. No responsibility is accepted for damage caused by the use of any

other parts or accessories.

In order to take account of a policy of continual development, Cirrus Research plc reserves the right to

change any of the information contained in this publication without prior notice.

Produced by Cirrus Research plc, Acoustic House, Bridlington Road, Hunmanby, North Yorkshire, YO14

0PH, United Kingdom.

Reference Number 07/22/CR514&515/09

CR:514 & CR:515 Acoustic Calibrator User Manual Page 3

Contents

Contents...................................................................................................................... 3

Operation.........................................................................................................................4

Switching

the

Calibrator

.............................................................................................. 4

Permanent-on Mode ...................................................................................................... 4

Calibrating a Sound Level Meter...................................................................................... 5

Background Noise ......................................................................................................... 5

Stabilisation.................................................................................................................. 5

Changing the Battery ......................................................................................................6

Battery

type ................................................................................................................. 6

Specification ....................................................................................................................7

Technical Information ......................................................................................................8

Free Field Correction .......................................................................................................9

Microphone Correction Values.......................................................................................... 9

EU Declaration of Conformity......................................................................................... 10

Product Guarantee & Extended Warranty......................................................................11

Cirrus Research Offices ..................................................................................................12

Page 4 CR:514 & CR:515 Acoustic Calibrator User Manual

Operation

Switching

the

Calibrator

Press the Power button on the end of the Calibrator to switch the unit on. The indicator

will illuminate to show that the unit is operating.

The calibrator will automatically switch off after 5 minutes to preserve battery power.

To switch off the calibrator manually, press the power button again and the indicator

will extinguish to show that the unit is switched off.

Permanent-on Mode

For some applications there may be a need to have the calibrator switched on

continuously. To allow for this, the calibrator can be turned on by pressing and holding

the power button for three seconds.

Release the button and the indicator will flash to show that the unit is in permanent-on

mode. Press the power button to switch off the calibrator.

Power indicator

Power button

CR:514 & CR:515 Acoustic Calibrator User Manual Page 5

Calibrating a Sound Level Meter

Push the microphone of the Sound Level Meter into the cavity at the end of the

calibrator. Ensure the microphone is fully inserted into the cavity and is past the ‘O’ ring

seals. The microphone should be parallel to the body of the calibrator. Also ensure that

the small bleed-hole next to the microphone cavity is not blocked as this could cause

damage to the microphone.

Most modern Sound Level Meters have electronic calibration with the level adjusted

automatically. Adjust the Sound Level Meter to the correct level where applicable.

When correcting the value generated by the calibrator a correction for the type of

microphone capsule may need to be applied (see Appendix 2)

Background Noise

In order for the calibrator to operate as intended, the ambient acoustic noise level

should be no greater than 80dBA.

Stabilisation

In order for the sound pressure level and frequency to stabilise after switching the

calibrator on when coupled to a microphone, a period of at least 5 seconds should be

allowed before performing a calibration.

Page 6 CR:514 & CR:515 Acoustic Calibrator User Manual

Changing the Battery

The CR:514 & CR:515 acoustic calibrators use a single 9v alkaline battery. This type of

battery is known as 6F22 or NEDA 1604. It is also commonly known as PP3.

1. Unscrew the screw holding the battery cover on, using a coin.

2. The battery, type 6F22 (PP3) can now be eased out of its holder and replaced.

The battery should be eased out terminal side first by pushing against the spring

at the other end. Ensure that the battery is inserted with the correct polarity

with the negative terminal at the contact with the larger cutout.

Battery

type

The battery should be an alkaline battery, not an ordinary dry cell. The battery is 9

volts when new and will operate the calibrator down to 6.4 volts. When the battery

voltage is below 6.6 volts but above 6.4 volts, the power LED will flash to indicate that

the battery voltage is low. When the battery voltage is below 6.4 volts the calibrator

will not turn on. A discharged battery may allow switch-on but will soon drop in voltage

and indicate low battery or switch off.

CR:514 & CR:515 Acoustic Calibrator User Manual Page 7

Specification

Frequency 1kHz ± 1%

Sound Level 94dB re 20μPa

Standardisation CR:514 - IEC 60942:2017 Class 2

CR:515 - IEC 60942:2017 Class 1

Distortion Less than 2%

Operating Humidity 25 to 90% Relative Humidity

Operating Static Pressure 65 kPa to 108kPa

Operating Temperature -10oC to +50oC

Storing Temperature -20oC to +60oC

Effective Volume 6.19 cm3 0.2 cm3

Cavity Diameter 0.525 inch

Battery 1 x 9v 6F22 (Neda 1604)

Battery Life Approx 15 Hours Continuous Use

Battery Voltage 9v Nominal (10v Maximum, 6.4v Minimum)

Weight with Battery 185g

Dimensions 120mm x Ø48mm

Page 8 CR:514 & CR:515 Acoustic Calibrator User Manual

Technical Information

The normal mode of operation of the calibrator is with the unit switched on.

When the LED indicates the unit is switched on this produces the greatest radio

frequency emissions.

The calibrator continues to function after exposure to contact discharges up to 4kV and

air discharges up to 8kV, for both positive and negative voltages relative to earth

ground.

The calibrator conforms to IEC 60942:2017 for a modulated root-mean-square

electromagnetic field strength of 10 V/m.

The maximum susceptibility to power and radio frequency fields is with the cavity facing

away from the emitter with the battery compartment facing the table, the antenna

polarisation horizontal and the calibrator switched on.

CR:514 & CR:515 Acoustic Calibrator User Manual Page 9

Free Field Correction

When calibrating a microphone which is to be used for free field measurements, a small

correction may be necessary to compensate for the difference between the

microphone's free field response at 'zero degrees' or 'head-on' incidence and the

pressure level generated by the calibrator.

The correction is typically -0.3dB for ½ inch microphones (making the effective

calibration level 93.7dB).

The table below shows the correction values for the standard microphones of Cirrus

Research plc.

Calibration corrections are listed below for the Cirrus Research plc ½" Capsules and

three microphone capsules commonly used in Calibration Laboratories:

Microphone Correction Values

Microphone Type Calibration Correction Effective Calibration Level

MK:202 -0.3dB 93.7 dB

MK:215 -0.3dB 93.7 dB

MK:216 -0.3dB 93.7 dB

MK:226 -0.3dB 93.7 dB

MK:224 -0.3dB 93.7 dB

B&K 4134 0dB 94.0 dB

B&K 4180 0dB 94.0 dB

B&K 4192 0dB 94.0 dB

Example

An example of the procedure used to calculate the value for an MK:224 microphone is

shown below :

Level = 94.0dB + Microphone Correction

Level = 94.0dB + ( -0.3dB)

Level = 93.7dB

Different microphones will have different correction values. Please check the operation

manual for the Sound Level Meter or microphone concerned for details.

Page 10 CR:514 & CR:515 Acoustic Calibrator User Manual

EU Declaration of Conformity

Manufacturer:

Cirrus Research plc

Acoustic House, Bridlington Road

Hunmanby, North Yorkshire, YO14 0PH

United Kingdom

Equipment Description

The following equipment manufactured after 1st September 2022:

CR:514 Acoustic Calibrator

CR:515 Acoustic Calibrator

According to:

EMC Directive 2014/30/EU

Low Voltage Directive 2014/35/EU

RoHS Directive 2011/65/EU

meet the following standards

EN61000-6-3:2020

Electromagnetic compatibility (EMC). Generic standards. Emission standard for

residential, commercial and light-industrial environments

EN61000-6-1:2020

Electromagnetic compatibility (EMC). Generic standards. Immunity for residential,

commercial and light-industrial environments

EN 61000-6-2:2019

Electromagnetic compatibility (EMC) - Generic standards - Immunity standard for

industrial environments

Auxiliary Industry Standards

EN 60942:2017 Sound calibrators

Signed Dated 20th July 2022

Mark Swale

Chief Engineer

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