20
Using the Filter Slots in the ISS-2
The filter slots (one at the light source, a second in the sample holder) can be used to hold filters or light
blocks. The most useful filters include an FG-3 blue filter for increasing the relative energy near 400 nm
and 800 nm compared to 600 nm, an IR cutoff filter to reduce stray light below 750 nm, and a 550 nm
high-pass filter to eliminate second-order effects on Shortwave NIR measurements.
1.
To install a filter at the light source, simply insert the filter into the filter slot. The slot accommodates
filters up to 3 mm thick and accepts color-correcting and longpass filters (round or square). There is no
clamp to hold the filter in place.
2.
To install a filter in the sample holder filter slot, loosen the filter clamping screw with an Allen wrench
and insert the filter into the filter slot. The filter slot can accommodate filters up to 6 mm thick. Clamp
the filter in place by gently tightening with an Allen wrench.
Replacing the Bulb on the ISS-2
1.
Order a replacement bulb.
2.
Turn off the lamp and detach the power supply. Allow the lamp to cool.
3.
Remove the fan from the bottom of the lamp by loosening the four screws securing it to the base. Two
of the four screws also hold the two front legs in place. Once the screws are loosened, gently pull the
fan, along with the legs, away from the lamp.
4.
Now that the fan is removed, use an Allen wrench to loosen the set screw that is underneath the fan.
This screw holds the bulb in place. You do not need to remove the set screw -- loosening it is sufficient.
5.
Locate the two set screws at the back of the lamp, one above each back leg. These two screws keep the
two halves of the lamp together. Remove the two screws.
6.
Gently separate the two halves of the lamp and pull the bulb out of its housing.
7.
Detach the wire and socket from the lamp leads. Remove bulb unit and discard.
8.
Plug the new bulb into the socket and slide it forward into the front of the lamp as far as it will go.
9.
Tighten the set screw on the bottom of the lamp to hold the bulb in place.
10.
Close the two halves of the lamp, being careful not to pinch the wires.
11.
Replace the two screws at the back of the lamp and secure the fan to the bottom of the lamp.
Spectral Output of the ISS-2
This graph represents a blackbody curve for the 3100 K color-temperature, tungsten-halogen light source.
The actual spectral output of the lamp will vary due to the spectrometer configuration, grating efficiency,
the sampling optics used, and the detector’s efficiency.
900-hour bulb / 3100K
0
0.2
0.4
0.6
0.8
1
1.2
300
500
700
900
1100
1300
1500
1700
1900
Wavelength (nm)
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