Analyzer DIK D in the outbreak of the objective change-over switch push (fig. 1/5) in to attack.
Bertrandlinse switch on (
►
(5)). Aperture diaphragm with centring screw center (fig. 1/9) to the pupil.
Pin levers in one of the two slots in the ZwischenringDIK D would bring in and thus the knurled internal ring so for a
long time turn, until the central black interference fringes visibly becoming in the pupil lies horizontally.
Prism DIK D cond with writing, the fitting the objective, upward in such a way into the outbreak of the single screen
admission insert that the springy pin of the screen admission comes to lie into the notch of the Prismenfassung
(fingerprints vermei). Prism with centering screws in the screen admission fix.
Single screen admission into the appropriate swallow guidance of the condensor lens A TRAILEr to attack push in and
with knurled nut (fig. 3/34) wedge. The interference fringes must disappear from the pupil, if their number doubles
itself, lie the prism in the intermediate ring DIK D around 180° in the azimuth twistedly. Pull in this case single
screen admission out again, prism in the intermediate ring around 180 far turn, until the interference fringe system
appears again horizontal; again, disappeared now the interference fringes push single screen admission in from the
pupil.
Bertrandlinse switch off, field observe.
Turn at the centering screws of the single screen admission, until the field appears darkest and no relief-like contrasting
to be seen is.
Prism in the intermediate ring DIK D with pin lever slightly adjust, until the field appears darkest. Thus the mechanism
is adjusted.
Adjust the contrast in a general manner as descriptive with the EinrichtungDIK D GF-PA.
(13) Positive and negative phase contrast, differential interference contrast and central dark field with the Kontrasttubus
_______________________ _
If the optical members after (1), leave themselves simply, rapid the contrast procedures are to each other adjusted and in fast change
would drive through.
Shift levers for lens 1/1.6 (fig. 4/41) on symbol 1x flat ten
Contrast loop switch on: Lever (fig. 4/38) on symbol
Switch on objectively, preparation present and after Köhler light up.
Differential interference contrast
Lightinglateral modulator DIK cond, picture-lateral modulator DIK KT,
λ
/4-Platte and polarizer into the path of rays
scolded.
Polarizer turn, until optimal contrast enters.
With the rotation of the polarizer over ± 45° changes the course differentiated
Δ
over ±
λ
/4, thus from a
light position over the dark position (= “quasi-dark field”, no relief effect) for other light position. In
many cases the best grey contrast lies with
Δ≈
λ
/8.
Color contrast:
λ
- plate additionally switch on, polarizer turn, until the desired color contrast enters. With the rotation
of the polarizer over ± 45° changes the course differentiated between
Δ
over
λ
±
λ
/4, is called from blue over the
“critical color” (sensitive =teint), in which the relief effect disappears, to red.
Quasi-light field:
λ
- and
λ
/4-Platte switch off and polarizer on “45” turn.
