30 ENGLISH
OPTIONAL ACCESSORIES
POSITIVE PHASE CONTRAST DEVICE
(models B4 and B5 only)
Equipment: phase contrast condenser (7a - ref. fig. 7)
phase objectives (7c - ref. fig. 7) - centring telescopic
eyepiece (7b - ref. fig. 7).
a) Installation:
a.1) Having loosened the fixing screw (18 - ref. fig. 1),
remove the brightfield condenser (8 - ref. fig. 1)
and insert the phase contrast condenser
(7a - ref. fig. 7). Retighten the screw (18 - ref. fig. 1)
again.
a.2) Replace the bright field objectives (16 - ref. fig. 1)
with phase contrast versions (7c - ref. fig. 7),
positioning them, clockwise, in increasing order
of magnification.
b) Centring:
1) Replace an eyepiece (13 - ref. fig. 1) with the
centring telescopic eyepiece (7b - ref. fig. 7)
supplied with the phase contrast device.
2) Using the 10x objective, set the phase contrast
condenser (7a - ref. fig. 7) to the number 10
position.Through the centring telescopic eyepiece
(7b - ref.fig. 7), check the phase rings are concentric,
as shown in figure 8a.
3) If the rings are not concentric (figure 8b), centre
them, carefully moving only the knurled ring
positioned in conjunction with the turret
(7a-1 - ref. fig. 7) of the phase condenser.
4) For centring the system when using higher
magnifications, repeat procedure 3) above,
remembering to always position the condenser
at the same number as the magnification value,
shown on the objectives (25x-40x-100x).
Figure 7
Figure 8a
Figure 8b
7a
7a - 1
7b 7c
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