Wavetek 85XT Manual do Utilizador descarregar pdf (Página 2)

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Lab Exercises:

A. Electronic Instrumentation (~60-70 min: estimated amount of time)

1. Set both the Wavetek handheld digital multi-meter (DMM) and the Agilent HP34401 DMM to read resistance.

Short the input leads of each meter. Record the readings. [~5 min.]

[Q1] Compare the results between the two meters. Do they both read exactly 0Ω?

2. Measure the resistance of 5 different resistors in the resistance substitution box. Do this first using the Wavetek

handheld DMM, and then the Agilent DMM. Pick resistance values that range from very low to very high.

NOTE: The correct terminals to use on the resistance substitution box are the two green binding pots, (NOT the

binding post labeled ‘ground’). [~15 min.]

[Q2] Compare the results between the two meters.

3. Use the Agilent Programmable Power Supply to supply exactly 9.00V. Measure the voltage at its output

terminals using both DMM’s. [~10 min.]

[Q3] Compare the results between the two meters.

4. Using the Tektronix oscilloscope to measure the output of the B&K function generator. Set the function

generator to output a 100Hz sine wave. Set the amplitude control (AMPL) to about mid-range. Turn the DC

offset off (push the OFFSET button in). Plug the output directly into the input of Channel 1 on the scope.

a. Manual Scope Adjustment:

Adjust the timebase of the scope (“Horizontal” section, SEC/DIV) to display about 2 complete cycles of

the sine wave. Adjust the gain of Channel 1 (“Vertical” section, VOLTS/DIV) to display the full peak-to-

valley extent of the sine wave. [~5 min.]

[Q4] What is the peak-to-peak (Pk-Pk) measurement on the scope?

[Q5] What is the RMS measurement on the scope?

[Q6] What is the period?

[Q7] What is the frequency measurement on the scope?

Change the function generator to a frequency of 10kHz, and increase the amplitude to full-scale (fully

clockwise). Notice that the trace on the scope appears totally black (displaying too many cycles across

the screen to resolve them individually). Now, instead of manually adjusting the scope…

b. Automatic Scope Adjustment: [~5 min.]

Push the AUTOSET button. Life couldn’t be easier. After doing this, you still have the ability to manually make

any adjustments. The AUTOSET button just gives you a great starting point. Make good use of the AUTOSET

button.

c. Waveform Comparison: [~10 min.]

Switch between the first 3 waveforms that are on the function generator. These are a Sine, Rectangle, and

Triangle function. Set the DC OFFSET control to off. For each waveform, set the amplitude to 2V peak-to-peak.

Use the AUTOSET button to display each waveform.

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Wavetek 85XT Manual do Utilizador Página 2