106Advanced Operations6.8.2 Upgrade of the instrument softwareTo obtain the software for the update from the Internet atwww.hach.com:1. Go to http://www.hach.com.2. On the DR 5000 product page, click Lab SystemSoftware/Software Update Downloads under the headingDownloads.3. Locate the appropriate download and follow the prompts forsaving the file(s) to the USB memory stick.4. On the DR 5000, press Instrument Update in the SystemChecks menu.5. Connect the USB stick to the USB interface on the DR 5000(section 3.3 on page 14). Press OK.The link is establishedautomatically and the software is updated.6. Press OK to return to the System Checks menu.Note: When the instrument software has been updated, a prompt to restartthe instrument is displayed.6.8.3 Optical checksFor each optical check, the measured results must be evaluatedagainst user-specific requirements. The check options do notdefine tolerances.1. Press Optical Checks in the System Checks menu.The Optical Checks menu contains programs for checking thewavelength accuracy, stray light and photometric accuracy.An optional test filter set (Verification Kit) (Section 9 on page 129)containing six precision glass filters, target values, tolerances andinstructions is available and is recommended as an aid for carryingout comprehensive in-house instrument checks.
