Cirrus Research CR308, Instrument Handbook

Page: 2 / 28

Page 2 CR:308 & CR:310 – User Manual
About this manual
The instructions in this user manual refer to the operation of Cirrus Research plc CR:308 and
CR:310 entry-level sound level meters.
The instruments described in this manual are the CR:308 and CR:310.
This manual describes the recommended usage of the CR:308 and CR:310. Any warnings will
be indicated by the following symbol:
The additional information required for testing in accordance with IEC 61672 is provided as a
supplementary document, ‘Optimus Sound Level Meters Technical Data Part B’, which is
available for download at: www.cirrusresearch.co.uk/library/user-manuals/
It is not possible to change the way that the instrument measures through software or firmware.
Any legal metrology aspects of the instrument cannot be affected by any changes made in the
instrument.