# User:Corbin A. Plugge/Notebook/Physics307L/2010/09/01

Oscilloscope lab Main project page
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## Oscilloscope lab day 2

### Equipment

• Tektronix TDS1002 Digital oscilloscope
• bk precision 4017A 10MHz sweep/function generator

### Setup

• Function generator output was connected to the oscilloscope ch1 input via a BNC cable.
• Both devices were plugged into a 115V power strip.

### Triggering

• Edge trigger was the only trigger that I was able to make use of.
• The trigger could be set for rising or falling edge and adjusted to a specified amplitude.
• By adjusting the amplitude of the trigger I found I could effectively move the plot left and right. This was helpful in making measurement using the grid.

### AC coupling

• Switching to AC coupling removed the DC offset making waves with a DC offset easier to view.
• As a side note I observed that the peaks of the waves flattened out when I gave the signal a large DC offset.

### measuring Fall time: with a square wave

Thanks to Katie Richardson for her help with understanding what a fall time is.

#### data

• freq:5.6Hz V1:11.6V V2:2.08V deltaT:40ms (measure function 58.56ms) time between 90% and 10% of the first falling edge of the waveform
• freq:11.2Hz V1:13.4V V2:3.6V deltaT:30ms (measure function 39.3ms)
• freq:56.75Hz V1:10.1V V2:7.1V deltaT:7.5ms (measure function about 3ms)
• freq:6cycles per77.2s 77.7mHz V1:9.76V V2:1.76V deltaT 40ms(measure function about 51.8ms) note:waiting for the trigger sucks

#### Analysis

I neglected to record the amplitude when I was collecting data making it impossible to calculate the fall time as far as I could tell from information gleaned from http://en.wikipedia.org/wiki/Rise_time.

I feel the most accurate rise time is 51.8ms measured on the slowest frequency. I feel the smaller values for the fall time measured with the oscilloscope are inaccurate because at the higher frequency's the voltage has a sharp drop before reaching 10% of the peak voltage.