Oscilloscope lab day 2
- Tektronix TDS1002 Digital oscilloscope
- bk precision 4017A 10MHz sweep/function generator
- Function generator output was connected to the oscilloscope ch1 input via a BNC cable.
- Both devices were plugged into a 115V power strip.
- 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.
- 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.
- 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
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.