Lamp Calibration Adjustment - Hach DR/2010 Instrument Manual

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
then press the
DOWN ARROW
mode, go to Step 3. If it is in Momentary mode, put the instrument in
Constant On mode by pressing
toggle to Constant On. Press
3. While still in the Setup Menu, press the
and press
Adjust nm:
again. The display will show:
ENTER
4. Press the key. The display will show:
ENTER
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
. The display shows
ENTER
8. Press . A good adjustment gives a momentary display of
ENTER
with 808 in the nm field, and then reverts to the
Completed
display. If you are unable to obtain a good adjustment,
Program #
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
display shows
Adjust nm:
to display
Default Setup:
back to the
Enter Program #
key twice. If lamp: is in Constant On
ENTER
again.
ENTER
. The display will show:
ENTER
Zero Required
ARE YOU SURE?
, , then press the
SHIFT SETUP
. Press . Then press the
ENTER
and press
ENTER
prompt.
94
, then press the
UP ARROW
key to scroll to
UP ARROW
Peak Filter
100.0 %T Peak Filter
.
key twice so the
UP ARROW
UP ARROW
again. Press twice to get
EXIT
, ,
SHIFT SETUP
key to
. Press
Enter
key once