Vernier Original LabQuest - Manual (Page 13)

LabQuest Reference
11
Various photogate modes are available to set what LabQuest calculates from the raw block
and unblock times. The mode labeled None will generate a table of only the raw block and
unblock times.
Mode: Motion Timing
Motion Timing is used for picket fences and ultra pulley experiments, and yields position,
velocity and acceleration data. The distance between block events can be set; default values
for common objects are already defined for you.
Mode: Gate Timing
A speed can be calculated from knowing the block to unblock time from an object of known
length passing through a photogate. In Gate Timing you enter a length in meters, and
LabQuest App finds the speed from the block to unblock time interval.
Mode: Pulse Timing
If you know the distance between a pair of photogates, the block-to-block time interval can
be used to find a speed. Pulse timing finds a speed based on the block-to-block time interval,
and a distance entered.
Mode: Pendulum Timing
The period of a pendulum can be accurately determined if the pendulum bob passes through
the gate. LabQuest reports the time from a block event to the third block event, ignoring the
one in between, so that a complete period is measured.
Mode: Drop Counting
Drop counting mode is a combination digital/analog mode. Each time a drop through a
Vernier Drop Counter is detected, a counter is incremented, and any analog sensors, such as
a pH sensor, are read. In this way the pH as a function
of volume can be plotted.
In any dialog that requires the entry of either text or
numbers, a keyboard will pop up as needed. Tap the
field into which you want to place text or numbers, and
tap the needed keys.
Change Units
Each sensor has its own set of available units for
display. To see the available choice, choose Change
Units, choosing the sensor in question. Choosing a new
unit will change all existing runs for that sensor to the
new unit, as well as any subsequent runs. You can
change units in the Sensors menu or in the meter
popup menu.
Calibrate
Most sensors do not need to be calibrated, as a factory