Physics307L:People/Gooden/Notebook/070827

set up

I set up the oscilloscope with a BNC cable to ch1 connecting to the low output of the generator. Generator producing sine waves at ~50 Hz. Set on DC coupling.

ch1 positioned at v=0. Trigger set at v=0, slope-rising.

Measurements

Measurement- Voltage with original wave

    1. using the grid to measure amplitude  
       of the wave I get ~4.4 volts.
    2. using the cursor mode I find an      
       amplitude of ~4.64 volts.
    3. Using the measure control I again   
       find an amplitude of ~4.64 volts. 

    REPEATS:making voltage measurements using the measure 
    and cursor controls for waves of different 
    applitudes and 20 and 30 hz.
    1. 20hz wave, I find 2.72 volts after   
       adjusting the amplitude.
    2. 30 hz with another adjusted amplitude I find
       1.36 volts as the amplitude.

Measurements- frequency - original wave (f=1/T)

    1. Grid- I find period of ~20ms and so for frequency I find ~50hz
    2. Cursor- I find a frequency of ~50Hz
    3. Measure control- I find a frequency of ~49.50 Hz

    REPEATS:making frequency measurements using the measure 
    and cursor controls for waves of 2.4v 
    applitudes and 30 hz.

    1. Cursor- 30.6 Hz
    2. Measure control- I find 30.6 Hz

       * Trying these functions for different types of waveforms
        (square wave, etc) to measure frequency and amplitude
        the oscilloscope seems to do so properly.*

Triggering

    A) What does triggering on the rising edge mean?
       - this means that the trigger is set at a specified voltage on the 
         oscilloscope,and when the waveform reaches that value and is increasing, 
         event is registered.

AC Coupling

    A)Read the ac coupling article
    B)Getting a voltage of about 12V, and then looking at the AC coupling to shift the signal
      back to zero voltage, and then decreasing the sec/div and volts/div a distinct 
      but 'noisy' sine component appears. The amplitude of the wave is ~10mV and a frequency
      of ~50kHz.
    C)Measuring Fall time - cursor function
        1. Using 1.12 volt square wave, and measuring with the cursor command I find a 
           fall time of ~52ms
        2. 880mV square wave, I find ~52ms
    C) Measuring Fall time - Measure function
        1. 880mV square wave, I find ~50ms
        2. 1.12 V square wave, I find ~50ms
    D)To find the RC constant we can use the equations given to us in the wikipedia article
      on the lab outline. The equation gives us [math]\displaystyle{ .1=(1-exp(-t/s)) }[/math]