The Vertical Measurement Cursors can make this job a little easier. Determine the time for one cycle based on the Time Base setting and the number of divisions in one cycle. You can “freeze” the image by hitting the Capture/Single Shot button. After the initial transient you should see a fairly repeatable wave shape, although it may not appear perfectly sinusoidal. Pluck the string and watch the waveform on the oscilloscope. There should only be about 5 mm (0.2 inches) between the string and the pickup.ĥ. Hook on the 1000 gram mass and position the pickup just below the center of the string (i.e., about 0.5 meters from the pulley or stop). Adjust the movable stop of the apparatus (an Allen wrench may be required) so that the center of the stop is 1 meter away from the center of the pulley opposite.Ĥ. Feed the wire over the groove on top of the adjustable stop piece, over the pulley at the far end, and leaving the other end of the wire dangling free.ģ. Referring to Figure 1, connect one end of the first wire to the hook on the back of the apparatus. For initial settings, set Bandwidth to 20 MHz instead of Full, set the Time Base to 10 milliseconds per division and the Amplitude to 50 millivolts per division.Ģ. Turn on the oscilloscope and select the Quick Menu button. Turn on the mic pre-amp and set the gain to 3/4ths maximum. Connect the magnetic pickup to the channel one input of the mic pre-amp with an alligator clip to BNC cable. Connect the channel one output of the mic pre-amp to channel one of the oscilloscope with a BNC to BNC cable. Variation of Wire Gauge (mass per unit length)ġ.
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