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CR:270 Series User Manual 

 

 

Page 26 

Warranty Information.

 

 

1.

 

This document is a summary of the full warranty document and explains the Cirrus Research plc 

warranty in ordinary English; not in legal or complex terms. 

2.

 

The warranty covers any acoustic instrument such as a sound level meter, acoustic calibrator, real 
time acoustic analyser or personal sound exposure meter (dosemeter) manufactured by Cirrus 

Research plc after September 1st 2011.  

3.

 

The warranty covers all faults on, and minor accidental damage to, the instrument except the 

microphone capsule for the period defined in para (5) below. 

4.

 

Minor accidental damage does not include blatant miss-use, damage caused by the use of any 

accessories or components not specified or recommended by Cirrus, damage caused through non-

Cirrus modification, continued use outside of Cirrus’ recommended procedure or conditions or use 

contrary to the any advice provided by Cirrus. 

5.

 

The initial period of the warranty is 2 (two) years or 104 weeks from the date of purchase as a new 

instrument from Cirrus Research plc or their formally approved distributors OR 130 weeks from the 

date the instrument passed its final manufacturing inspection at Cirrus Research plc - whichever is 
the shorter. 

6.

 

A shorter 1 (one) year or 52 week warranty is offered for used, ex-demo or ex-rental equipment 

unless a special arrangement is made and a written confirmation of the special warranty is given by 

Cirrus Research plc.  

7.

 

Any rechargeable battery only has the battery manufacturer’s one year warranty, however there 

will be a reduced charge for their replacement during the annual “Traceable Calibration.” 

8.

 

On completion of the annual “Traceable Calibration” by Cirrus Research plc, or an official Cirrus 
Calibration Centre, the instrument will automatically be given an additional free one year warranty. 

9.

 

It follows that should the instrument be calibrated by Cirrus Research plc, or an official Cirrus 

Calibration Centre every year, the warranty is effectively continuous to a maximum of 15 (fifteen) 

years from the date of purchase.  

10.

 

There will be a charge for this “Traceable Calibration” and the price is published in the Calibration 

Price List. The customer is responsible for all shipping, duty and other charges relating to the 

annual “Traceable Calibration”. 

11.

 

Where a repair service is conducted under warranty, Cirrus Research plc will cover the shipping, 
duty and other costs relating to the repair of the instrument. 

12.

 

Cirrus Research endeavours to ensure stocks of instrument components for the full fifteen year 

period but do not guarantee to do so as certain components do become obsolete or discontinued. 

13.

 

If a sub-component becomes obsolete and stocks are depleted then Cirrus Research will endeavor 

to facilitate a repair but will not offer the same length warranty. 

14.

 

In the event of any dispute on the terms of the warranty Cirrus Research plc will accept pendulum 

arbitration by the United Kingdom Institute of Acoustics Ltd.  

15.

 

The warranty does not in any way reduce any legal right of the buyer or user of the sound level 

meter; it is in addition to all legal rights determined by the European Union. 

16.

 

Cirrus Research plc reserves the right to amend or update these terms and conditions without prior 

notice. 

Warranty Terms 2.5 May 2012 

Summary of Contents for CR:270 Series

Page 1: ...CR 270 Series User Manual Page 1 CR 270 Series Sound Level Meters User Manual This manual the software to which it relates the program code and drawings are all Copyright Cirrus Research plc 1989 2015...

Page 2: ...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 Re...

Page 3: ...0 Selecting the Active filter 10 Turning off Octave filters 11 Filters and Weighting 11 Display and Indicators 11 Annunciators 11 Full Centre colon 11 Overload 11 Battery low 11 Summary 12 Calibration...

Page 4: ...eting both these specifications to Type 1 and Type 2 accuracy where applicable The CR 273 and CR 274 instruments also features octave band filters that meet or exceed the requirements of IEC 1260 The...

Page 5: ...t Switches for Calibration Calibrate Instrument Check Battery Select Function Check Range Reset Sound Level SPL Average Sound Level Leq Peak Level LPeak C Record Measurement Check Calibration Power Of...

Page 6: ...sure that the black HOLD button is OUT If this is not done the display will not freeze the last reading and the central colon will be displayed in the LCD Always check the instrument calibration befor...

Page 7: ...ll be reset by the instrument to prevent nonsensical results due to mixtures of levels or weightings The centre position marked dB C permits use as a normal sound level meter with the C Weighting filt...

Page 8: ...he right hand position SPL and in the left hand position it will measure Leq The position of the switch does NOT affect the acquisition of data by the Leq circuitry the switch simply determines what i...

Page 9: ...ALL accidently In the Leq mode the button does NOT cause the reading to go to zero While RESET ALL is pressed the reading will be in an undefined random position as the meter is trying to divide two...

Page 10: ...e upper most label will all be extinguished Switching on the filters One quick push duration less than 1 second of the OCTAVE FILTER button will switch in the octave filters ie make them active Once t...

Page 11: ...is simply that data acquisition stops The CR 27x will still function on SPL and PEAK C If this colon lights then read the Leq note it along with the peak if required and reset the instrument Overload...

Page 12: ...rument more internationally compatible Summary Function Annunciator Cause Possible Action Overload Amplifier overload Move UP one range Under range Amplifier at noise floor Move DOWN one range Battery...

Page 13: ...psule whilst the CR 271 and CR 273 instrument are fitted with the MK 224 capsule Both of these microphones have a calibration correction of 0 3dB Refer to the Acoustic Calibrator manual for details Th...

Page 14: ...th Cirrus Research As A and C weightings all have nominal zero correction loss at 1kHz the reading on these two positions should be nominally the same However due to minor instrument tolerances there...

Page 15: ...ll the battery leads The batteries are connected to clips which are designed to prevent the batteries from being connected with the wrong polarity Types of batteries The CR 270 series should be used w...

Page 16: ...sses involved and the order in which these should be applied if appropriate Octave Band Method The Octave band method is a straightforward noise reduction calculation involving the measurement of the...

Page 17: ...s from the octave band sound pressure levels Octave Band Centre Frequency Hz 63 125 250 500 1000 2000 4000 8000 SPL APV 7 4 10 0 14 4 19 6 22 8 29 6 38 8 34 1 To calculate the effective A Weighted so...

Page 18: ...predicted noise level reduction PNR is calculated from the H M and L values The formula used depends upon the difference between the LCeq and the LAeq If LCeq LAeq is less than or equal to 2 2 4 A C...

Page 19: ...ncidence is parallel to the case as marked with an arrow on the cone IEC 804 651 11 2 3 The range of measurement for Leq and SPL measurement with a standard assembly is CR 272 CR 274 32 to 140 dB A 50...

Page 20: ...on for a microphone extension cable on the standard CR 272 CR 274 units However if an extension cable option is in use with the CR 271 or CR 273 units C irrus Research cables up to 10 meters long will...

Page 21: ...ld use IEC 804 11 2 28 The indicator range is identical to the linearity range of IEC 804 11 2 4 Additional Octave information The CR 274 meets IEC 1260 Type 2 whilst the CR 273 meets IEC 1260 Type 1...

Page 22: ...74 60 to 110dB 0 5dB CR 273 50 to 110dB 0 5dB IEC 1260 7j The range should be selected such that neither the underrange or overload flags occur during measurement IEC 1260 7k Not applicable IEC 1260 7...

Page 23: ...CD display battery annunciator indicates that the batteries are not sufficient to run the instrument correctly IEC 1260 7t The filter is integral to the CR 273 and CR 274 IEC 1260 7u The instrument is...

Page 24: ...ally 1 Gigohm Weighting networks A and C for CR 272 and CR 271 A and Lin for CR 274 CR 273 Display type 3 digit reflective LCD Time weighting S Slow F Fast I Impulse All to IEC 651 relevant Type Displ...

Page 25: ...after 1st January 1996 CR 272 Sound Level Meter CR 271 Sound Level Meter CR 274 Sound Level Meter CR 273 Sound Level Meter Along with their standard accessories According to EMC Directives 89 336 EEC...

Page 26: ...will be a reduced charge for their replacement during the annual Traceable Calibration 8 On completion of the annual Traceable Calibration by Cirrus Research plc or an official Cirrus Calibration Cent...

Page 27: ...manby North Yorkshire United Kingdom YO14 0PH Telephone 44 0 1723 891655 Fax 44 0 1723 891742 E mail sales cirrusresearch co uk Web Site www cirrusresearch co uk Germany Cirrus Research plc Deutschlan...

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