Product specifications

Instrumentation Laboratory Exercise 37
Run the program and verify that it can read the signal from the CdS
cell. Move the motor slowly and confirm that the voltage level changes
from low when dark to a higher voltage when exposed to light. From
this graph you can estimate the maximum and minimum values, as
well as the frequency of periodic signals. Calculate the frequency from
the horizontal axis:
Where Period is the time from one wave to the next wave.
Alternatively you may count the number of whole cycles of the
waveform in the Strip Chart. If you have set the X scale properly the
trace will be 100 ms long (1/10 s).
Your frequency can be calculated from the number of cycles displayed
(n) divided by the time of the trace (0.1 s), or:
For a more accurate measurement of amplitude we can apply some
built- in functions on the waveform data. Add another Formula box,
and feed the corrected array into it. Calculate the Mean. To get the
peak- to- peak value we can calculate the Maximum value and subtract
the Minimum value from it. Set up the Formula box as shown.
Freq 1 Period()⁄=
Freq n 0.1()⁄=