3nh NH300, Руководство по эксплуатации

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High-Quality Portable Colorimeter
7
Figure 5 White Calibration Fail
Select option 1, you should replace the white calibration cover. After
confirmation, the instrument will re-start white calibration automatically.
Select option 2, the instrument will skip white calibration and enter
operating interface directly. At the moment,
the instrument will adopt
the last white and back calibration data. We do not recommend
you to choose this option, because it may
make the measured
data not accurate enough .
b) Manual White Calibration and Black Calibration
After turning on NH310 colorimeter, press “Menu” to enter the main
menu, as shown in Figure 6. Select “Calibrate” to enter White and
Black Calibration interface, as shown in Figure 7.
Be sure the white calibration cover is well installed. Selecting “White
Calibration” and press “Enter” button, the instrument will prompt you to
place the white calibration plate. Then press “Enter” or “Testing” key to
start white calibration.
Be sure the white calibration cover is removed. Select “Black
Calibration” and press “Enter”. The instrument will prompt you to direct
the measuring aperture to the air. Press “Enter” again or press “Testing”
key to start black calibration.
Note: When starting black calibration, direct the measuring port to
the air. Be sure the black calibration is performing in a dark , no
bright light source environment. Keep the measuring port more
than 3m away from any refl ective items (hands, desks, walls etc.).