Hach-Lange DR 5000 User Manual - Manual (Page 117)

117
Advanced Operations
5. The Drift Check runs 1 hour.
This test takes a reading every minute for one hour. Every
15 minutes, linear regression is used to calculate the slope
(rate of change) for the previous 15 minute interval.
6. The last reading and slope for each 15 minute interval are
displayed. At the end of the hour, the overall values are
calculated and displayed. The test proceeds to completion.
7. Press Cancel to return to Optical Checks.
6.8.3.6 Verification kit
The Verification Kit (see Section 9 on page 133 ) is designed for
periodic monitoring of scattered light, photometric accuracy and the
wavelength accuracy of the spectrophotometers.
When results exceed allowable tolerances (given in the quality
control certificate to the test record), contact the manufacturer.
1. Press Verification Kit in the Optical Checks menu.
2. Press Nominal Values.