The current supplied by the circuit to the scope will be roughly 10 times

# The current supplied by the circuit to the scope will

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What are two possible advantages of using 10X probes when taking scope measurements? The current supplied by the circuit to the scope will be roughly 10 times smaller which reduces circuit loading. The other possible advantage of using a 10X probes is that they can work with low voltage signals or high-frequency signals which are susceptible to noise pick-up. 2) How does scope know the 10X probes were connected? New scopes has a metallic “sensing” strip, which recognizes the probe. With older scopes you have to plug in a value of n that should be 10 with a 10X probe and make sure that the oscilloscope indicates that the n value is 10. Although, you should always make sure n equals 10 when using 10X probes. Section 2 - Procedure By using BNC-to-BNC cables and a BNC T the Function Generator is connected to Channel 1 of the oscilloscope. Then the other end of the T is connected to the multimeter with a BNC-to-banana cable. The output of the function generator is set to 5V peak-to-peak sine-wave at 500Hz, the DC-offset is set to 0V. By switching between AC and DC coupling it is possible to observe any difference displayed. With DC coupling active a scope image was imported using Keysight BenchView. By using the Cursors feature of the scope the DC offset is measured. Lastly, the DC offset was set to 2V instead of 0V. Observation of any difference between the waves displayed with AC and DC coupling, an image was imported and the DC offset was measured once again.

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Section 2 - Experimental Data Waveform 1 (5 V pp , 500 Hz, +0V DC ): Multimeter Readings: V DC = 0, V AC = 1.767V Cursor Reading: Y max = +2.45V, Y min = -2.5V DC Offset = (2.45 - 2.5)/2 = -0.025V
Waveform 2 (5 V pp , 500 Hz, +2V DC ): Multimeter Readings: V DC = 1.64, V AC = 1.767V Cursor Reading: Y max = +4.438V, Y min = -0.5V DC Offset = (4.438 - 0.5)/2 = 1.969V Section 2 - Questions and discussion 1) Would you expect the multimeter measurement to change when transitioning from AC to DC coupling on the scope? Why? When choosing DC you will see the actual waveform, including its AC and DC components.

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• Fall '06
• Wang

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