EASY
SENSE V-Log Reference Manual
DO248 (5)
14
Data Harvest Group Ltd, 2014
Using a Picket fence:
Measurements shown are for
instantaneous speed or acceleration i.e. it took this amount of
time to travel this distance and the speed or acceleration was.
To improve the accuracy of readings,
an increment is automatically applied
to a picket fence with a pitch length of
less than 60 mm. This will mean that
there are fewer readings than number
of pitches on a fence.
For example:
(
l)
=
80 mm
- readings taken with a pitch increment of 1 (80 mm).
Instantaneous Acceleration is calculated using the change in Velocity of 2
pitches divided by the time taken for the velocity to change
.
Using a Spoked Pulley
: Measurements shown are for instantaneous speed or acceleration i.e. it took this
amount of time to travel this distance and the speed or acceleration was.
The measurement of the Data Harvest Spoked Pulley is pre-defined.
Set up the investigation but do not enter
►
press enter until you are ready to take
readings (the spokes on the pulley can easily interrupt the Light gate beam and
create false results). When all is ready press
►
for the recording to start (the ►
symbol will disappear from the bottom line).
Pitch length (l)
Readings taken with a pitch increment of:
80 mm
1 (80 x 1 = 80 mm)
60mm
1 (60 x 1 = 60 mm)
40 mm
2 (40 x 2 = 80 mm)
20 mm
4 (20 x 4 = 80 mm)
10 mm
5 (10 x 5 = 50 mm)
Speed at A
= 0.61369 ms
-1
#2
@time =202.30468 s
@distance = 0.050 m
V
2
– V
1
t
2
+ t
3
– t
0
+ t
1
2 2
t
4
t
3
t
2
t
1
t
0
l
T
0
T
1
T
2
T
3
T
4
T
5
T
6
T
7
T
8
T
9
T
10
D (40mm)
1
D (120mm)
2
D (200mm)
3
D (280mm)
4
D (360mm)
5
40
80
120
160
200
240
280
320
360
400
0
Reading 1
Reading 2
Reading 3
Reading 4
Reading 5
