Wavetek 85XT Manual do Utilizador descarregar pdf (Página 4)

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[Q18] What is the measured RMS value?

C. Fundamental Electrical DC Circuits

1. Ohm’s Law (15min: estimated amount of time):

In this exercise, we will measure the current through, and simultaneously the voltage across, a 10kΩ resistor to

verify Ohm’s Law. A plot of current vs. voltage should yield a straight line, and the slope should equal the

inverse of the resistance. The intercept should be zero (no potential across the resistor results in no current

flow):

    

(1)

     where  





and   

(2)

Use the Agilent power supply as an accurate (and stable) voltage source across a 10kΩ resistor. Place the

Wavetek DMM in series with the power supply and the resistor (to measure the current through the resistor).

Place the Agilent 34401A DMM in parallel with the resistor (to measure the voltage across the resistor). Set the

DMM to read DC volts (“DC V”).

Step the power supply from 0 to 10V with step size of 1V. Take readings of the voltage and current at each

setting.

[Q19] Plot the current vs. the voltage and determine the resistance from the graph. Does your result verify Ohm’s

Law? Is the value you calculate within the tolerance marked on the body of the resistor?

Figure 1. Ohm’s Law Verification Circuit Block Diagram

Now measure the resistance using the internal ohmmeter functions of both the Agilent DMM and the Wavetek

DMM.

[Q20] Compare to the marked value of 10kΩ. Are the measured values within the tolerance marked on the body of

the resistor?

2. Voltage Divider (15min: estimated amount of time):

Wire the circuit shown, omitting R3. Use two resistance substitution boxes for R1 and R2 and set them initially to

10kΩ each. Measure the voltage between points B and C and between points A and C (the overall supply

voltage).

Agilent Power

Supply

Agilent DMM

Wavetek DMM

1 2 3 4 5

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