Rectifiers also contribute significantly hesting improved cA performance and longevity. The main Ac lab testing process for this lab are TENS unit for pain relief follows:. Testinf the rms current processs through the capacitor using the multimeter as an milliammeter and record this measurement in the appropriate place in the results sheet. Enable the Wavegen as the ac voltage source in Waveforms. These documents are copyrighted by ASTM International, Barr Harbor Drive,PO Box C, West Conshohocken, PA USA.

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ACI ASTM C231 - Air Content: Pressure Method 2019 This pprocess applies to Ac lab testing process Testing Laboratories, Improve metabolism with natural ingredients which test refrigerants Ax within Ac lab testing process scope of AHRI Standard A Refrigerant Testing Prpcess is defined as Ac lab testing process testingg that can accurately perform the test tedting prescribed tezting AHRI Gesting on any refrigerant. The rules and procedures for obtaining and maintaining certification are detailed in the Resources section above. Please ensure that you are familiar with the latest rules and procedures for this program. Resources Program-specific Forms RTL-DS1 — Essential Equipment List EEL RTL Program Sample Preparation Procedures RTL Checklist for Independent Third-Party Laboratory Operations Manuals Product-Specific Operations Manual General Operations Manual Jan 23 Related Standard s and Documents AHRI : Specifications for Refrigerants AHRI C : Appendix C to AHRI Standard Analytical Procedures for AHRI Standard AHRI D : Appendix D Gas Chromatograms for AHRI Standard Informative. Certification Program Find AHRI Certified® Refrigerant Testing Laboratory.

Ac lab testing process -

Return the second per division back to µs. Trigger controls allow you to stabilize repetitive waveforms and capture single-shot waveforms. The trigger makes repetitive waveforms appear static on the oscilloscope display by repeatedly displaying the same portion of the input signal.

Imagine the jumble on the screen that would result if each sweep started at a different place on the signal, as illustrated the figure below. The most basic and most common type of triggering is edge triggering.

The trigger circuit acts as a comparator. You select the slope and voltage level on one input of the comparator. The slope control determines whether the trigger point is on the rising or the falling edge of a signal.

A rising edge is a positive slope and a falling edge is a negative slope. The level control determines where on the edge the trigger point occurs. The trigger level is the voltage that the input waveform must pass through to initiate a waveform capture.

The trigger level is indicated in 2 different spots shown below. The second trigger level indicator is an arrow located on the right side of the display as shown below. The trigger menu has the following options. Notice, if you move the trigger level above or below the peaks of the waveform what happens?

The signal is no longer triggered. A function generator is a piece of electronic test equipment used to generate different types of repetitive voltage waveforms over a wide range of frequencies. Some of the most common waveforms produced by the function generator are the sine wave , square wave and triangular wave.

Common function generators have controls to control the frequency, amplitude, DC offset, duty cycle and the waveform type. Below is an image of the function generators available in the laboratory.

Frequency - There are 3 separate controls for the frequency. Waveform Type - Simply select the desired waveform type by pushing the appropriate button: Sine, Square or Triangular.

Amplitude - Typically there is 2 Ranges for the amplitude. The normal range that goes up to approximately 10V and the dB range which is used when small voltages are required. Duty Cycle - Controls the duty cycle of the output waveform. DC Offset - Allows you to add a DC offset to the output waveform.

Connect the function generator output to channel 1 of the oscilloscope by connecting the 2 reds of the BNC-to-banana leads together, also connect the 2 blacks together. You need to change the Probe setting for Channel 1 on the oscillscope to 1X as that is what the BNC-to-banana plug leads are.

Take some time to experiment with both the function generator and the oscilloscope so you become familiar with the controls. Displayed properly means at least 1 cycle up to about 10, The waveform should at least 3 division tall and not clipped off the screen as well as triggered properly.

Use the Multimeter to make the following measurements on some of the components on the Student Circuit Board. Measure the resistance of the Ω resistor, The 68nF and 1µF capacitors, and the 2. Record these results in the appropriate place on the results sheet. Measure the capacitance of the 2 capacitors 68nf and 1µF.

To use the multimeter to measure capacitance, first set it up as an ohmmeter and then press the yellow button. Use the circuit below to demonstrate how a Ω resistor behaves while ac voltages of various frequencies are applied to it.

Use a BNC-to-banana cable to connect the function generator as a variable frequency sinusoidal AC supply to the Ω resistor that is available on the student PCB, while also using a banana cable to also connect the digital multimeter as an AC milliammeter to measure the RMS current going through the resistor.

Use another BNC-to-banana cable to connect channel 1 of the oscilloscope to measure the voltage across the resistor, make sure that the oscilloscope is set to use a 1X probe. While using the oscilloscope to view the voltage across the resistor adjust the function generator to output a Hz sinewave with no DC offset at maximum output voltage.

Method 1 - Counting Divisions Follow these steps to measure the period and peak-to-peak magnitude of the sinewave using Method To measure the period of the sinewave, count the number of divisions on the screen of the oscilloscope that a single cycle of the sinewave spans and record that and the current seconds per division setting in the appropriate place on the results sheet.

To obtain the period you simply need to multiply the number of divisions by the seconds per division, also record this in the appropriate place on the results sheet. To measure the peak-to-peak voltage of the sinewave, count the number of division on the screen that the magnitude of the sinewave spans ie.

from minimum to maximum and multiply that by the current volts per division. Record all 3 of these values in the appropriate place on the results sheet.

Method 2 - Using Cursors Follow these steps to measure the period and peak-to-peak magnitude of the sinewave using Method Record these values in the appropriate place on the results sheet.

Record this value in the appropriate place on the results sheet. Method 3 - Automatic Measurements Follow these steps to measure the period, peak-to-peak and rms magnitude of the sinewave using Method For each slot you have the ability to make a different type of measurement for either channel.

Measure the rms current going through the resistor using the multimeter as an milliammeter and record this measurement in the appropriate place in the results sheet. Repeat the same measurements outlined in steps d-g with the function generator set to 1kHz and then again at 10kHz recording all results in the appropriate places on the results sheet.

Use the circuit below to demonstrate how a 68nF capacitor behaves while ac voltages of various frequencies are applied to it. Use a BNC-to-banana cable to connect the function generator as a variable frequency sinusoidal AC supply to the 68nF capacitor that is available on the student PCB, while also using a banana cable to also connect the digital multimeter as an AC milliammeter to measure the RMS current going through the resistor.

Use another BNC-to-banana cable to connect channel 1 of the oscilloscope to measure the voltage across the capacitor. While using the oscilloscope to view the voltage across the capacitor adjust the function generator to output a Hz sinewave with no DC offset at maximum output voltage. Make sure the voltage sinewave waveform across the capacitor is displayed appropriately on the screen of the oscillscope and use the automatic measurements to measure both the frequency and RMS voltage applied to the capacitor.

Record these results in the appropriate place in the results sheet. Measure the rms current going through the capacitor using the multimeter as an milliammeter and record this measurement in the appropriate place in the results sheet.

Repeat the same measurements outlined in steps d-e with the function generator set to 1kHz and then again at 10kHz recording all results in the appropriate places on the results sheet.

Use the circuit below to demonstrate how a 2. Use the circuit below to demonstrate how the impedance of the series resistor-capacitor changes while ac voltages of various frequencies are applied to it. Use a BNC-to-banana cable to connect the function generator as a variable frequency sinusoidal AC supply to the Ω resistor in series with the 1uf capacitor, while also using a banana cable to also connect the digital multimeter as an AC milliammeter to measure the RMS current coming from the function generator.

Use another BNC-to-banana cable to connect channel 1 of the oscilloscope across the output of the function generator and milliammeter so the voltage across the combined impedance of the resistor and capacitor can be measured. Note: Channel 1 and Channel 2 both have a common ground.

This means that you must connect the black lead of both channels to the same node of the circuit otherwise you will be creating a short circuit through the oscilloscope.

Use yet another BNC-to-banana cable to connect channel 2 of the oscilloscope across the capacitor while making sure that both of the black leads coming from channel 1 and 2 of the oscilloscope are connected together.

While using channel 1 of the oscilloscope to view the voltage output of the function generator adjust the function generators output to a Hz sinewave with no DC offset at maximum output voltage. Use the oscilloscope to measure and record the following in the appropriate place in the results sheet:.

t C-S : The phase difference in time between the capacitor voltage and the source voltage. Measure the rms source current supplied to the circuit using the multimeter as an milliammeter and record this measurement in the appropriate place in the results sheet.

Disconnect both oscilloscope probes from the circuit and reconnect them as shown below so we can now measure the voltage across the resistor and also have the source voltage as a reference for phase. In this case channel 1 is now measuring the source voltage but inverted from before. Channel 2 is now measuring the voltage across resistor but also inverted with respect to how we measured the capacitor.

You will notice that you end up with the same result either way. You need to do it this way because the 2 channels have a common ground. t R-S : The phase difference in time between the resistor voltage and the source voltage.

Repeat the same measurements outlined in steps e-h with the function generator set to 1kHz and then again at 10kHz recording all results in the appropriate places on the results sheet. For the last column on the results sheet you need adjust the frequency of function generator until the peak-to-peak voltage across the capacitor and resistor are the same.

Repeat the measurements again outlined in e-h with with these new settings and record your results in the appropriate place on the results sheet. Re-use the previous circuit replacing the 1µF capacitor with the 2. The following is what you are expected to hand-in one week by pm after completion of the lab.

You only have to hand-in one copy per group. There is an assignment box in the D-ICE pedway located just before the elevators marked ECE Lab. Please staple everything together in the following order:. Use the first page of your Result Sheet as your cover page. Your results sheet should be signed twice by the laboratory instuctor or teaching assistant, once at the beginning of the lab to show that you have completed your prelab and once when you have completed the lab and finished cleaning up.

The remaining completed Results Sheets in order with all calculations, results and graphs as required.

For the AC Resistors section calculate the waveform period and the peak-to-peak voltage from your counting divisions measurements. Also calculate the resistance of the resistor by using your measured RMS voltage and RMS current.

For both AC Capacitors sections calculate both the reactance of the capacitor and the capacitance of the capacitor using your measured values.

For the AC Inductor section first calulate the inductors impedance using your measured values. Then, using the measured value of the non-ideal inductors resistance calculate the inductors reactance.

Use this reactance to calculate the inductance of the inductor. For the Series RL Circuit section calculate all of the same things as the previous section with the following modifications. Answer the following questions on a separate piece of paper to hand in with your Results Sheet.

Explain how connecting the ground connections of each channel of an oscilloscope to different nodes in a test circuit can cause issues with your circuit. What are the potential dangers in doing this? Draw an example circuit to assist in your explanation. Make some general observations and conclusions about how each of the different components on the plot Impedance-Frequency of R, L and C behave.

Looking at your results, does the inductor behave more like an ideal component at Hz or at 10kHz? Use what you know about a non-ideal inductor and your measurements as an example to explain your answer. In your results for the Series RC circuit is the phase between the capacitor voltage and the resistor voltage approximately 90° as expected at all frequencies?

Explain in your own words why this is expected? ECE Lab. Lab 3 - Intro to AC Circuits ECE - Electrical Circuits I Electrical and Computer Engineering - University of Alberta.

These objectives should be kept in mind as the students work through the lab procedure. Describe in your own words what a Function Generator is.

Describe in your own words what an Oscilloscope is. figure 1. Tektronix TDS Oscilloscope. figure 2. Typical oscilloscope voltage probe. figure 3. Oscilloscope probe comp setup. figure 4. Oscilloscope probe comp test waveform. figure 5. Vertical section controls. figure 6.

Vertical position indicator. These tests include: Glucose Tolerance tests, Lactose Tolerance tests. If you are dropping off samples and do not require blood work, please bring the samples to a specimen receiving location. Refer to Specimen Receiving Locations. If your test requires a specific collection time please make sure you arrive before that time to allow for the registration process and the associated wait time.

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Glucose Tolerance testing is not offered at Bayers Road, Woodlawn, and St. Margaret's Bay Blood Collection. If you are having AC and PC glucose your blood will be drawn as fasting AC sample , then you will be instructed to go and eat breakfast and return to have your blood collected at the two-hour mark PC sample If you are dropping off samples and do not require blood work, please bring the samples to a specimen receiving location.

Refer to Specimen Receiving Locations If your test requires a specific collection time please make sure you arrive before that time to allow for the registration process and the associated wait time.

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