# Physics307L F08:People/Koch/Figuring out Oscilloscope

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## Contents |

## Links

- http://en.wikipedia.org/wiki/Oscilloscope
- http://en.wikipedia.org/wiki/Fall_time
- http://en.wikipedia.org/wiki/Rise_time
- Fourier series applet
- Oscilloscope from ZTEC (Link from Lorenzo Trujillo)

## First, measuring basics of a wave

- Hook up scope to measure a wave w/ BNC cables (do we want to use terminators?)
- Measure characteristics of a sine wave
- Measure peak to peak voltage (thus amplitude) and measure the period (thus frequency)
- First, use the grid on the oscilloscope screen ("divisions" are the dotted lines)
- Next, use the cursors
- Finally, use the "measure" functions.

- Measure peak to peak voltage (thus amplitude) and measure the period (thus frequency)

## Triggering

## DC Offset

## AC Coupling

- Square wave, not pinning. 2.5 Hz, amplitude 8.6 +/- 0.1 V
- Fall time using cursors:
- 61 ms; w/ measure (60 +/- 0.5) ms
- 62 ms
- 61 ms

- Fall time using cursors:
- What RC constant does this imply, and what is the TDS 1002 supposed to be?
- AC coupling mystery: Max DC offset, 2.5 Hz, max amplitude (so it's pinning at 13V): Ask students to explain what is going on.

## FFT

- Find the frequency of a sine wave using FFT "Math" function
- Look at the harmonics in triangle and square wave
- Compare with what you see on this applet: Fourier series applet

## Other features

- Display:Persist
- Acquire:Average (average out noise)
- Display:XY