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page 52 Ring method measurements
8.2 Parameters for the ring method in Setup
The first two pages of the
Setup
menu contain parameters which affect the course of
the measurement with the plate method. Assumingly, they rarely need to be altered.
Only those parameters which are relevant for the ring method are described here; the
complete
Setup
menu is described in chapter 10.
To open the
Setup
menu press the key
.
The parameters which are relevant for the ring method
Measuring speed
,
Immersing
Speed
and
Detection speed
on the first page and
Immersion depth
on the second
page of the
Setup
menu.
8.2.1 Measuring speed
This is where the speed at which the sample stage moves up or down to determine the
maximum force is defined.
*
The default value of 3mm/min mainly needs to be reduced for interfacial tension
measurements and for small surface tensions, as at higher speeds the lamella can
tear more quickly. This applies chiefly to the
IFT push
mode.
8.2.2 Detection speed
At the start of the measurement the sample stage is first moved upwards. The contact
between the plate and the surface of the liquid is registered owing to the change in
force; the height position is stored for the measurement. The
Detection speed
is the
speed at which the sample stage moves upwards to find the liquid surface.
*
The default value of 20mm/min is normally suitable. You should not increase it by
much as otherwise the detected surface height becomes less accurate.