Vernier LabQuest 2 - Manual (Page 19)

LabQuest App
15
Data Marking can be used to mark
points of interest during a time-
based data collection. When
enabled, a Mark Data button
will appear during data collection.
Tap
to mark that particular
point as a point of interest. After
completing data collection, data
marks can be named using the panel
to the right of the graph.
o Mode: Events with Entry – Sometimes
experiments depend on a quantity other
than time. For example, in a Boyle’s law
experiment, one wants to know the
pressure as a function of the volume of
gas. In Events with Entry mode, no time
information is recorded.
Enter a name and units for each
independent variable. You also have an
option to average data over ten seconds and report the averaged reading.
In Events with Entry mode, a Keep
button
appears during data
collection. Tap Keep to record the sensor
value (e.g., gas pressure in the Boyle’s
law experiment). In response, LabQuest
prompts you to enter a value for the
independent variable (e.g., gas volume in
the Boyle’s law experiment). Sensor data
is plotted against the independent
variable, as shown in the screenshot at
the right.
o Mode: Selected Events – Selected Events
mode is similar to Events with Entry,
except that entries of 1, 2, 3... are
automatically recorded as the
independent variable. To record time
information in place of an entry value,
select the check box for Use Time
Column.
o Mode: Photogate Timing – Photogates
require a different set of timing options.
When a photogate is detected, LabQuest
enters the Photogate Timing mode.
You have two options for ending data
collection in this mode: tap Stop, or end
collection after a defined number of
events. A block/unblock pair counts as