50
RUNNING A TEST
4. To choose the desired a
w
resolution, highlight “Resolution,” press the Enter button, and
then cycle to the desired value using the up and down arrows. Choose any value between
0.003 and 1.0 a
w
. The resolution for DDI determines the target a
w
resolution. Setting
a higher step value makes the test faster, but decreases the a
w
resolution. METER
recommends a DDI step of 0.01 a
w
.
Figure 43 Edit stages DVS method
5. To choose the air flow rate, highlight “Flow,” press the Enter button, and then cycle to the
desired value using the up and down arrows. You can select any value between 10 and
163 ml/min. Higher flow rates speed up the test, but may result in lower data resolution and
nonequilibrium conditions. The default value of 100 ml/min is suitable for most products.
6. To choose to include a timeout setting, press the Enter button with “Timeout”
highlighted, and then cycle to the desired value using the up and down arrows. You
can select any value between 5.0 minutes and 30 days. The timeout determines the
maximum time allotted to move from the starting a
w
to the final a
w
(DDI only) and is
optional. The default value is off, which means there is no timeout value.
7. To choose to have the isotherm loop, highlight “Loop” and press the Enter button to
toggle between on and off. Turning loop on causes the isotherm to automatically return
to the starting a
w
(with the same settings) once the final a
w
has been achieved. This
would create both an adsorption and desorption curve (or vice versa depending on the
starting direction).
8. When finished adjusting the settings for the stage, press the Save button to save and
return to the Edit Stage screen. Press Cancel to return to Edit Stage screen without
saving changes.
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