Product specifications

Instrumentation Laboratory Exercise 24
This experiment is repeated for each of the mentioned voltages. The
resulting curves (a linear increase in motor current with applied load)
will be recorded in a graph and curve fit (offline). The slopes of the
curves will be compared. Additionally the armature resistance of the
motor will be calculated.
3.2 Circuit setup
V
i
will be fed into pin 1 of the DAQ board, V
m
will go into pin 2, and
the circuit ground will be fed into the ground (pin 39) of the DAQ.
3.3 VEE programming
As in the previous exercises, the voltages will be read using the
Direct I/O command. V
i
will come in on analog input 101, and V
m
will
come in on analog input 102. Set them up as UNIPolar and SINGle
ended with a RANGe of 10 V. Set up a Formula box to calculate
V
m
–V
i
. Display this as Motor Voltage.
In a separate formula box calculate and display the motor current by
dividing V
i
by 0.5. Now calculate and display the resistance of the
motor. This is the motor voltage divided by the motor current.
V
V
m
V
i
R
1
M
R
1
= 0.5 Ω, 5 W
M = 5 V PM-DC motor