3B Scientific U40205 Bedienungsanleitung Seite 17

Fig. 8 Example of measured curve
5. Software description
5.1 Information bar
The information bar at the top of the window contains
three fields. The "Value" field displays the value
currently being measured by the torsional balance.
The "Elapsed Time" field displays the time from the
start of the measurement and the "Data" field sh ows
the data at any point in the trace where the cursor is
located.
5.2 "View Record" bar
The "View Record" bar is located on the right beneath
the trace window. The following information is
displayed there: the sampling rate, the measuring
mode, "Single pass" (for one-off measurements) or
"Continuous" (for long-term measurements) and
whether the measurement is being made in real time
or is from a data record that has been loaded into the
program.
5.3 Comment bar
The comment bar is located directly beneath the "View
Record" bar. It allows comments regarding the
experiments to be entered.
5.4 Tool bar
The tool bar is on the left under the trace window and
allows for the selection of parameters for the
acquisition of measurements. 5 separate sampling
rates can be selected from the "Sampling Rate" field.
The "Number of Points" field offers 7 "data breadths"
from 512 to 32768 points and allows 19 hours of data
or more to be recorded. The "Range" field offers the
choice of 6 different ways to scale the y-axis. When
the "Single Pass" option is selected, recording of data
stops after a single pass. Otherwise the data is
acquired on a continuous basis.
Underneath the tool bar on the left there are 8 buttons
in 2 rows. The top left of these is the "Examine Data"
button. Selecting this button causes an angle to be
displayed in the information bar along with the time. If
the cursor disappears, clicking this button can make it
visible again.
Both the x and y axes can be magnified using the
positive zoom button and by clicking with the left
mouse button in an active window. Clicking the
negative zoom button and the active window allows
the original magnification to be restored. The
maximum zoom setting displays 512 points in the
time shown multiplied by about 1.5 mrad.
Selecting the "Connect Data" button allows a line to be
drawn linking individual measured points.
To the right, one above the other, are the two buttons
"Select Points" and "Apply Corrections". "Select Points"
allows 1, 2 or 3 points on the trace to be selected in
order define an offset, a linear function or a quadratic
curve. These can then be used to correct any drift in a
long-term measurement. Changes in humidity have
proved to be the main cause of any such drift. In order
to select points, click the "Select Points" button and
click on the trace window and choose P1 from the
7