DV-8000 USER’S MANUAL
7
Maintenance
1. To ensure the steady operation of the instrument, it is recommended to use an AC
voltage stabilized power source.
2. After operation , turn off the power and cut off the power supply.
3. Put some desiccants over the instrument when it is not in use to keep it clean and
dry.
4. After months of operation or after it is moved, the instrument should be checked for
its wavelength accuracy.
Calibration And Trouble-shooting
After a long time of use, the instrument needs calibrating or repairing, as its
performance index may have changed, here are some tips.
1. Replacement of tungsten-halogen lamp
：
1) Turn off and unplug the instrument.
2) Remove the four screws on the sides of the spectrophotometer
.
3) Remove the
Cuvette Holder Control Knob
by unscrewing the rod counterclockwise.
4) Remove the WL. Setting Knob.
a) Use a Flat Head Screw Driver to pick the cover out from the knob.
b) Use a Spanner or Sleeve to loosen the screw in the knob, then remove the knob.
5)
Remove the cover of the instrument very carefully and place it in the back of the
instrument.
BE SURE NOT TO PULL PANEL WIRING LOOSE!
6)
Unplug and remove the lamp from ceramic base (the white connector). Insert the
new lamp; pushing it in as far as it will go.
CAUTION
:
a) Do not handle the lamp with bare fingers. Use tissue or cloth when handling lamp.
b) There’s no difference in polarity of the two legs of Tungsten-halogen lamp.
7) Set the wavelength of the instrument at 500nm, Switch on the power, move the lamp
up and down and from side to side, until its focus falls exactly on the entrance slit.
Observe the reading in T mode without adjusting the
△
/100%T
key
，
Readjust the
lamp to make the reading at its maximum. If it can not focus on the center of the
entrance slit, you have to adjust the four screws for the height of the light beam and
the horizontal adjustment.
8) Switch the instrument off, tighten the two screws. Reinstall the instrument cover. Be
sure to prevent all wires from being pinched in the process.
9)
Reinstall the four screws. Reposition the Cuvette Holder Control Knob and the
Wavelength Setting Knob.
2. Calibration of wavelength accuracy
DV-8000 spectrophotometer is checked for its wavelength accuracy by a
point-to-point method against the two characteristic absorption peaks of a didymium
filter---529nm and 808nm.
