Olympus BXC-CBB Anleitung Handbuch - Seite 15

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AS control

The AS mechanism uses backlash. For this reason, the AS diameter after moving varies depending whether the diaphragm

was opened or closed. This is referred as lost motion. The lost motion for this system corresponds approximately to 200

pulses. This phenomenon is more apparent when the AS diameter is smaller. The following figure shows the relationship of

the AS diameter to the specified pulse numbers using the 3-stage action, ① ⇒ ② ⇒ ③ , as an example.

Normal

In the normal mode, the specified AS diameter is achieved with the shortest path. As action ③ includes a lost motion, the

AS diameter defers from the AS diameter when stopped at action ① . Based on the recommended pulse number (see the

table on page 28) for each objective, select high-precision control, if necessary.

High-precision control

By selecting high-precision control, you can reduce the effect of the lost motion. In this mode, the positioning accuracy

improves as the system always stops at the specified AS diameter from the opening direction. However, if the opening

direction is specified, the control time will be longer for the amount of time it takes to move the distance shown with the

red arrow.

NP Control

Selecting "Rotate through the highest numbered hole" rotates the nosepiece to the specified hole using the shortest path.

Selecting "Does not rotate through the highest numbered hole" rotates the nosepiece in the opposite direction if the

shortest path to the specified hole goes through the highest numbered hole. By attaching a low-magnification objective to

hole 1 and a high-magnification objective to the highest numbered hole, you can avoid an objective colliding with the

sample when the nosepiece is rotated.

3. Setup procedures

3.5 Setting up BXC-CBB