Hach-Lange DR 3900 User Manual - Manual (Page 112)

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Expanded programs
7. Connect the USB memory stick to the USB port (type A) on
the instrument, refer to section 3.5, page 18 .
8. Press OK to confirm.
The link is established automatically and the software is
updated.
9. Press OK to return to the "System Check" menu.
Note: After the instrument update, a prompt to restart the instrument will
be displayed.
6.8.3 Optical Checks
1. Press Optical Checks in the "System Check" menu.
The "Optical Checks" menu contains programs for checking the
wavelength accuracy, stray light and photometric accuracy.
An optional test filter set (Verification Kit) Section 9, page 137
containing six precision glass filters, target values and
instructions is available as an aid for carrying out comprehensive
in-house instrument checks.
6.8.3.1 Verification kit
The Verification Kit (refer to Section 9, page 137 ) 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.
3. Press Edit.
An automatic menu guidance queries values (filters,
wavelength, nominal values and tolerances) given in the
quality control certificate, to the following specifications:
• Stray light
• Photometrical accuracy
• Wavelength accuracy
4. Press OK when all values are entered and the overview is
displayed.