5.Operation
2. Cryochamber temperature:
Press key until menu item ‘Set chamber temperature’ is displayed:
3.Preset counter
(instruments with sectioning motor only):
Press key until menu item ‘Preset counter’ is displayed:
P R E S E T C O U N T E R
d n - - -
= Preset counter activated
P R E S E T C O U N T E R
d n 0 5 6
= Preset counter deactivated
Preset counter function:
The preset counter allows the user to carry out a predefined number of sections in the ‘Continu- ous stroke’ sectioning mode.
Once the preselected number of sections has been carried out (= section counter reading ‘0’), the specimen head will stop automatically in the lower limit position.
The reference value (i.e. the value from which the preset counter counts downward) can be selected in the corresponding menu item.
In order to be able to set a reference value, the preset counter function must be active.
If the preset counter is deactivated (see diagrams above), press
to activate.
Now there are two options:
1.Increase or decrease the actual reference value by pressing 
or 
.
2.Press
and 
simultaneously in order to reload the former reference value (‘0’ when setting up the instrument) and then press ei-
ther 
or 
individually in order to select the desired reference value. Depending on where you start from and where you want to go, method 1 or method 2 is quicker (see ex- amples).
Example 1:
Actual preset counter reading = 50 Former reference value = 300
New reference value of 65 to be selected. Method 1 is most convenient:
• Increase from 50 to 65 by pressing 
.
Example 2:
Actual preset counter reading = 50 Former reference value = 300
New reference value of 320 to be selected. Method 2 is most convenient:
•Press 
and 
simultaneously to reload old reference value (300):
•Increase from 300 to 320 by pressing 
.
For further information on the preset counter, please refer to chapter 5.3.6, Item 4 ‘Preset counter’.
30 | Instruction Manual V1.2 - 11/2006 |