1. Carefully read the lab manual for the Electrical Measurements, Oscilloscope a

Question

1. Carefully read the lab manual for the Electrical Measurements, Oscilloscope and Meters.

2. Potential difference can be given as Peak to Peak Voltage (Vpp), Voltage amplitude (Vo), and Root Mean Square Voltage (Vrms). Rank these voltages from largest to smallest.

3. What is the relation between the frequency, f, of a wave and the period T.

4. An oscilloscope shows a graph of voltage versus time where typically the voltage is changing as a function of time. The length of time represented by the x - axis is controlled by the Timebase (see TIME/DIV in Figure 3 of lab manual). The picture below shows an image of a sinusoidal wave displayed on a BK Precision Oscilloscope similar to the one that you will use. The timebase was set at 0.2 ms/div meaning that every major division (1 cm block) horizontally represents 0.2 ms.

a) What time does the electron dot take to cross the screen for this timebase setting?

b) What is the period of the wave?

c) Suppose the timebase was changed to 1 ms/div how many waves would you see?

d) What is Vpp if the V/cm switch is set at 0.5 V/cm?

Explanation / Answer

2) Vpp>Vrms> Vo

as Vrms= 0.707 * Vo

and Vpp= 2 * Vo

3) frequency of wave (f) = 1/T

4) a) 10 square boxes are there on screen on which wave is traced with timebase 0.2 ms/div

so electron take 10 * 0.2ms/div = 2ms time to crossthe screen .

b) time period = time base * horizontal distance on screen (cm)(from one crest to another)

= 0.2 * 4

T = 0.8ms

c) frequecy = 1/T

T = 1ms/div*4

= 4ms

f = 1/T

=1/4ms

= 250 Hz

d) Vpp = vertical distance(peak to peak) * 0.5V/cm

= 6* 0.5 V/div

= 3 V

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