demo_19a - Description Lead Inductor Demo See schematic...

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6.002 Demo# 19A Lead Inductance Agarwal Fall 00 Purpose: This demo shows the inductive effect of long wires by showing voltage spikes on a power supply with a long lead when steps in current occur (due to switching of an inverter state). This effect disappears when a short lead is used. Steps: 1. With the long lead in place, show the inverter output (in response to a square wave input) and the power supply voltage (at a point after the lead) on the scope. Note the spikes on the supply voltage, and their correlation to the inverter output switching. 2. Show the noisy output of an inverter with the input tied high, as an example of the effects on other circuits when noise is on the supply. 3. Switch to a short lead, and show that the effects disappear. Long / short leads 6.002 Demo #19A Lead Inductor Prof. Agarwal Fall 00 (2) 14 (10) (14) FG2 Long Cable Short Cable 20 (20) Ch3 22 Ch4 10 7 Ch2 1 2 74LS04 74LS04 IC1 47 Ohm S1 S2 CH4 17 FG1 11 10 14 14 IC2
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Unformatted text preview: Description: Lead Inductor Demo See schematic diagram next page for more detail Cite as: Anant Agarwal and Jeffrey Lang, course materials for 6.002 Circuits and Electronics, Spring 2007. MIT OpenCourseWare (http://ocw.mit.edu/), Massachusetts Institute of Technology. Downloaded on [DD Month YYYY]. Oscilloscope Setup CH V/DIV OFFSET MODE FUNC MATH VERTICAL HORIZONTAL 1 off off 2 on 200mv 1.5 DC off 3 on 1 0 DC off 4 on 5 9 DC off Horizontal: 200 us Acquisition: AUTO AUTO 4 Trigger: CH4 Waveform Generator Setup Power Supply Setup UNIT WAVE AMP OFFSET FREQ +6 +25 -25 OUTPUT +5 off off FG2 Square 2.5 1.25 4 Khz Trigger: INT FG1 Square 2.5 1.25 100 HZ Trigger: INT Cite as: Anant Agarwal and Jeffrey Lang, course materials for 6.002 Circuits and Electronics, Spring 2007. MIT OpenCourseWare (http://ocw.mit.edu/), Massachusetts Institute of Technology. Downloaded on [DD Month YYYY]....
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This note was uploaded on 03/05/2010 for the course DA 1 taught by Professor Ww during the Spring '09 term at École Normale Supérieure.

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demo_19a - Description Lead Inductor Demo See schematic...

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