Jenoptik VARIOSCAN high resolution Series Manual page 46

Operation
In the isotherm editor, you can edit existing isotherms only, if they are
inside the current temperature visualisation range (In the example
above: 20°C ... 40°C). Otherwise, the isotherms are displayed by their
index number in the No-key. In this case, only the delete option is
accessible.
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Use these keys to select the isotherm (1 ... 9) that shall be
created or edited.
When you press this key, after you have edited an isotherm
but before pressing the SET key to programme the isotherm,
a query appears on the screen. You are asked whether you
want to programme it, before the editor switches to the next
isotherm. When you answer with 'No', the isotherm edited
last will be rejected.
A double click on the bottom key deletes all isotherms.
Select the colour of the isotherm. 9 colours are available:
Black, white, and 7 further colours that are not included in the
palette for image presentation.
Change the isotherm width in Kelvin.
A double click allows numeric entry of isotherm limits. At first,
enter the lower limit. All temperatures covered by the
calibration range are acceptable. After correct entry, the
system will ask for the entry of the upper limit. Here, all
temperature values between the lower limit and the upper
calibration limit are permissible.
Define the position of the isotherm on the temperature scale
in °C.
Isotherm