Here are the English Manuals for the 2638A HYDRA Series III Data Acquisition Unit.
The firmware update file with instructions can be found here:
And the trial version/Installer files for Fluke Daq software can be downloaded here.
Software download for licensed systems or Trial
Please note that if you are using a version of Fluke Daq software that is earlier than 6.0.4, you can use this download link to upgrade your existing software as well as to install it for the first time. This software is no longer available for purchase.
Please contact electricalsupport@flukecal.com for additional information or search our Knowledge Base articles.