Hach-Lange DR 3900 User Manual - Manual (Page 109)

109
Expanded programs
Time & Interval:
1. Press Time & Interval in the "Options" menu.
2. Enter the total time and measurement interval.
3. Press OK to confirm.
Note: In total, 500 measuring steps can be accomplished during a scan.
To select a total time and a time interval that would cause this number of
readings to be exceeded, the time interval is defined automatically and
the OK key is inactivated.
Scale & Units:
1. Press Scale & Units in the "Options" menu.
2. Highlight Abs or %T as the required units.
3. Highlight Auto or Manual scaling on the graph's y-axis.
Note: When selecting the manual scaling, the limit values y
min
and y
max
can be entered using the alphanumeric keypad. The graph is adjusted to
display only the values in the selected range. If automatic scaling is
selected, the instrument sets the limits automatically so that the total
range can be displayed.
4. Press OK to confirm.
5. Press Return to return to the Scan mode.
6.7.2 Time course scan reading
After all scan parameters have been selected, the instrument
must then be zeroed. Afterward the sample can be analyzed.
1. Insert the zero solution cell in the cell compartment and
close the cell compartment cover.
2. Press Zero.
The blank reading is shown on the display.
3. Insert the analysis cell in the cell compartment and close the
cell compartment cover.
4. Press Read.
The instrument will begin collecting Time Course data (kinetic
data).
Note: During the reading the Zero and Read keys change to Mark
and Stop.