# Introduction to Process Control Lab

Introduction to Process
Control Lab

1.
You are taking a
measurement of a signal from a sensor with high frequency noise. In order to
not amplify that noise through your instrumentation system, you decide to use a
RC filter with a cutoff frequency (critical frequency, fc)
of 1kHz after the sensor and before the amplification.
2.
What kind of RC
filter do you need? Design the RC filter. Be sure to use standard resistor and
capacitor values and specify the tolerance. Show all work.
3.
Construct the
circuit using Multisim. Use the tolerances which you specified in your design.
4.
Use the
multifunction generator for the input and use both channels of the Tektronix
virtual scope to display the input and output voltages.
5.
Create a table
of your input and output voltage at dc, 250 Hz, 500Hz, 750Hz, 1kHz, 5kHz, 10kHz,
50kHz, 100kHz. Measure additional frequency points in order to get a nice set
of data for the drop off. Be sure to capture several screenshots of the
Tektronix virtual scope.
6.
Given the output
voltage at dc, what is the voltage 3dB down? In other words, what is the output
voltage at the 3dB point? You should calculate this.
7.
Using your
simulation, change the frequency of the input voltage until the output voltage
is that associated with your 3dB point. What is the frequency of the signal?
That is your critical frequency. Take a screenshot of the scope. Add these
measurements to your table. Also, put in your report this frequency. What is
this frequency called?
8.
Create a plot of
your data (you can do this easily in Excel) and copy and paste the plot into your
report.
9.
Questions:
10.
Does your
circuit attenuate the signal at high frequencies? What is the attenuation at
10kHz?
11.
How does your
measured -3dB frequency (fc) compare to your design critical
frequency? Give some reasons why it is different.
work.
1.
You are taking a
measurement of a signal from a sensor with high frequency noise. In order to
not amplify that noise through your instrumentation system, you decide to use a
RC filter with a cutoff frequency (critical frequency, fc)
of 1kHz after the sensor and before the amplification.
1.
What kind of RC
filter do you need? Design the RC filter. Be sure to use standard resistor and
capacitor values and specify the tolerance. Show all work.
2.
Construct the
circuit using Multisim. Use the tolerances which you specified in your design.

Use the multifunction generator for the input and use both channels of
the Tektronix virtual scope to display the input and output voltages.

Create a table of your input and output voltage at dc, 250 Hz, 500Hz,
750Hz, 1kHz, 5kHz, 10kHz, 50kHz, 100kHz. Measure additional frequency points in
order to get a nice set of data for the drop off. Be sure to capture several
screenshots of the Tektronix virtual scope.

Given the output voltage at dc, what is the voltage 3dB down? In other words,
what is the output voltage at the 3dB point? You should calculate this.

Using your simulation, change the frequency of the input voltage until
the output voltage is that associated with your 3dB point. What is the
frequency of the signal? That is your critical frequency. Take a screenshot of
frequency. What is this frequency called?

Create a plot of your data (you can do this easily in Excel) and copy
and paste the plot into your report.

Questions:

1.
Does your
circuit attenuate the signal at high frequencies? What is the attenuation at
10kHz?
2.
How does your
measured -3dB frequency (fc) compare to your design critical frequency? Give
some reasons why it is different.

out and use the following.grantham.edu/at/uploads/Lab_report_template.docx”>Lab Report Template when submitting your lab work.

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