LAMBDA DG-4 PLUS & DG-5 PLUS OPERATION MANUAL – REV. 3.05B (20131009)
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important because if you forcefully push on the filter holder while you are trying to load a
filter, you run the risk of scratching the filter.
Figure 2-6. Filter holder assembly with blanking disc.
Place the desired filter into the filter cup, first. With some 1” filters extra care must be taken
to avoid getting the filters jammed at an angle inside the filter cup.
Next, install the spacer ring into the filter cup. Unless the filter thickness precludes the use
of the spacer ring, always install the spacer to provide maximum separation between the
filter surface and end of the brass spanner wrench that is used to turn the retaining ring.
Finally, install the threaded retaining ring.
CAUTION: DO NOT OVER TIGHTEN THE RETAINING RING!
2.4.3
Selection of a Filter Position
In most cases, any given filter could be installed at any of the four FILTER POSITIONS.
However, some minor considerations may improve performance of the system. Adjacent
FILTER POSITIONS will require slightly less switching time. Therefore, if an experiment
will require rapid switching between two filters they should be located next to one another. If
separated by one or more filters, there will be brief transitions through the intervening
filter(s) unless the TURBO-BLANKING feature is enabled (see “Modes of Operation”). While
this feature eliminates the transmission of light at unwanted wavelengths, it does further
increase the time required for switching.
2.4.4
Blanking Discs
The blanking discs should only be removed from those positions that will contain a filter. The
discs are intended as a safety device for the occasion where you may be looking into the
microscope. We strongly urge that the discs be used. Please be careful and avoid the
possibility of direct visualization of high intensity light.
2.4.5
Neutral Density Filters
. Filter installation is the same for this filter holder as described above. The slide portion of
the neutral density filter holder, however, is mechanically different from those used for the
interference filters. As a result, the two types of holders may not be interchanged.
2.4.6
Filter Holder Installation
Identify the access doors used to install the neutral density FILTER HOLDER and the four
interference FILTER HOLDERS. The small access door located near the top edge of the left
side panel on the Lambda DG-4 cabinet (see below) is for the neutral-density FILTER
HOLDER. The larger door in the middle of the left side panel is fro the interference FILTER
HOLDER. Loosen the black knob on these access doors to slide them up and install the