Hach DR/2000 - DR;2000 Spectrophotometer Procedure, Versions 2.0 and 2.2; DR;2000 v2.0;2.2 Setup and Mode Selection; DR;2000 v2.0;2.2 Wavelength Calibration

Wavelength Calibration Adjustment, continued
5
DR/2000 Spectrophotometer Procedure, Versions 2.0 and 2.2
1. Press:
SHIFT CONFIG/METH
Scroll with the Arrow keys
until the display shows:
CONSTANT ON
Note: Do not do this calibration
if your instrument has 1.261 or
1.27 version software!
2. Press READ/ENTER three
times to accept the mode
choice and return to the
METHOD #? prompt.
3. Press SHIFT %T to select
the %T mode. The display
will show:
%T
4. With the cell
compartment empty and the
cover closed, rotate the
wavelength dial until the
small display shows:
850 nm
5. Press:
CLEAR/ZERO
The display will show:
100.0% T
Note: If the display does not
read within ±0.3 %T, press
CLEAR/ZERO again.
6. Place the Calibration
Filter into the cell holder.
Close the cover.
Note: Align the key with the
notch in the cell holder opening.
7. Slowly turn the
wavelength dial counter-
clockwise (decreasing
wavelength). Record the
wavelength where the %T
is highest.
8. Turn the wavelength
control clockwise so the
wavelength is at least 10 nm
higher than the wavelength
value recorded in step 7.
850 nm