Product specifications

Instrumentation Laboratory Exercise 57
Similarly display the frequency as an AlphaNumeric box and feed it
into the X coordinate of the X vs Y Plot. Set up the X coordinate to
have a scale of 10 Hz to 100 Hz.
6.4 Test procedure
Once you have confirmed that you are reading the speed and
amplitude properly, clear the X- Y plot by right- clicking it and going to
Clear Display. Allow the motor to run at full speed. Slowly apply force
to the disk, slowing the motor. As the motor slows the frequency of
the signal will also be reduced.
When the high- pass filter is in place, lower frequencies will tend to
get filtered out. Thus, as the motor speed is reduced the amplitude of
the signal will be reduced. You should be able to clearly see this
trend as you slow the motor. Also notice the difference in the shape
of the wave form. Once you have completed this, have the technician
check your results and sign off your test sheet.
Now reconfigure the circuit in the low- pass configuration as per the
schematic above. The program should be the same, though you might
need to rescale some of the plots to get the data to fit nicely in the
window. If needed go to the Properties menu and reset the scale
values. Repeat the experiment for the low- pass filter. Now the filter
will attenuate high frequencies, so the amplitude should increase as
the motor slows, as shown below.