The new instrument firmware, now at version 1.07, adds the ability to have a standard CEL-350 (or 350IS) dBadge calculate both the A and the C frequency weighted noise levels. The extra information is measured and downloaded to dB35 software at version 2.04 or above. This allows for the correct assessment of the workplace noise levels for selection of the most suitable hearing protectors. The calculations allow the NRR or HML methods to be used that are not based on the normal octave band analysis of the noise.

This is a special price option that is not normally available in a standard CEL-350 dosimeter but must be purchased separately. CEL-350 dosimeters with the C-A calculation are designated the CEL-352 units and can be either the regular or the IS version at firmware 1.07 or higher.

All dBadges returned to Casella USA for annual recalibration will be automatically upgraded to the latest version of firmware at the same level as received (unless the upgrade to add the C-A calculation is ordered at the same time) and a new installation CD will be provided to go with the kit of dosimeters. Otherwise, customers can download the small update file here and carry out the firmware upgrade themselves. The process only takes a couple of minutes per dBadge and uses the 193200B (or CMC39) IR adaptor to upload the new program into the instrument. A help file is included, PLEASE BE SURE TO READ THE HELP FILE BEFORE STARTING THE UPGRADE!!

Click here to download the zipped file to upgrade your own dBadges too. Save the file in a temp folder on your hard drive then unzip the 3 files and follow the instructions given in the text file UPGHELP.TXT.

Read the Upgrade HELP file here first before proceeding. All stored run data MUST be downloaded to dB35 BEFORE starting the upgrade as the memory will be lost after the upgrade has taken place.

Please contact the Casella USA sales office for details of the cost of the C-A upgrade to your dosimeters.