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5.3 Lamp Calibration Adjustment
1. Empty the cell compartment and close the cover. Adjust the
wavelength to approximately 850 nm.
2. Verify the instrument is in Constant On mode by pressing
SHIFT, SETUP,
then press the
DOWN ARROW key twice. If lamp: is in Constant On
mode,gotoStep3.IfitisinMomentary mode, put the instrument in
Constant On mode by pressing
ENTER, then press the UP ARROW key to
toggle to Constant On.Press
ENTER again.
3. While still in the Setup Menu, press the
UP ARROW key to scroll to
Adjust nm: and press ENTER. The display will show: Peak Filter.Press
ENTER again. The display will show: Zero Required
4. Press the ENTER key. The display will show: 100.0 %T Peak Filter
5. Place the calibration filter into the sample compartment with the tab
aligned to the right. Close the cover.
6. Using the wavelength control on the side of the instrument, slowly
adjust the wavelength dial counterclockwise (decreasing wavelength)
while observing the transmittance reading in the display. Record the
wavelength (nm) where the % transmittance reading is greatest. Turn
the wavelength dial back in the other direction to at least 10 nm
higher than the value recorded above. Again adjust the wavelength
dial counterclockwise slowly while watching the % transmittance
display. Stop exactly on the peak (highest) transmittance value. You
may now adjust the calibration.
Note: Repeat Step 6 as needed until you have stopped dialing exactly on the
peak transmittance reading when approaching from the higher wavelength side
(counterclockwise direction).
7. With the peak transmittance determined in Step 6 displayed, press
ENTER. The display shows ARE YOU SURE?.
8. Press
ENTER. A good adjustment gives a momentary display of
Completed with 808 in the nm field, and then reverts to the Enter
Program #
display. If you are unable to obtain a good adjustment,
contact the Hach service center serving you.
If you do not have a Lamp Calibration Filter and/or wish to use the factory
default setting, press
SHIFT, SETUP,thenpresstheUP ARROW key twice so the
display shows
Adjust nm:.PressENTER.ThenpresstheUP ARROW key once
to display
Default Setup: and press ENTER again. Press EXIT twice to get
back to the
Enter Program # prompt.
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