c. Push . The display shows “- - - -”, then “0.00”.
5. Push and hold for 3 seconds to enter menu mode.
6. Push until "USEr" shows, then push .
7. Push until "CAL" shows, then push .
8. When "S0" shows on the display, push .
9. Enter 00.00 (or 000.0) for the blank value.
Push the or to change the number that flashes. Push to go
to the next digit. Push to go to the previous digit.
10. When “A0” shows on the display, push to measure the
absorbance of the blank.
The display shows the absorbance value for "S0".
11. Remove the sample cell from the cell holder.
12. Prepare the sample. Refer to the test procedure. For the sample,
use the standard solution concentration given in the test procedure
documentation.
13. Clean the sample cell with a no-lint cloth.
14. Push to show "S1" (or "Add"), then push .
15. Enter the concentration value of the first calibration standard, then
push .
16. When "A1" shows on the display, do the steps that follow to
measure the absorbance:
a. Insert the reacted standard sample cell in the cell holder.
b. Install the instrument cap over the cell holder.
c. Push . The display shows the absorbance value for "S1".
17. The calibration is completed with two calibration points. If additional
standards are necessary for calibration:
Do steps 11 and 16 again to measure more calibration standards.
18. Remove the sample cell from the cell holder.
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