Physics307L:People/Gooden/Notebook/070827: Difference between revisions
From OpenWetWare
Jump to navigationJump to search
No edit summary |
|||
(19 intermediate revisions by 2 users not shown) | |||
Line 1: | Line 1: | ||
{{Side comment|comment=[[User:Steven J. Koch|Steven J. Koch]] 00:52, 29 August 2007 (EDT):Overall, excellent lab notebook!}} | |||
==set up== | ==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== | ==Measurements== | ||
Measurement- Voltage with original wave | '''Measurement-''' Voltage with original wave | ||
1. using the grid to measure amplitude | 1. using the grid to measure amplitude | ||
of the wave I get ~4.4 volts. | of the wave I get ~4.4 volts. | ||
Line 14: | Line 16: | ||
REPEATS:making voltage measurements using the measure | REPEATS:making voltage measurements using the measure | ||
and cursor controls for waves | and cursor controls for waves of different | ||
applitudes and 20 and 30 hz. | applitudes and 20 and 30 hz. | ||
1. 20hz wave, I find 2.72 volts after | 1. 20hz wave, I find 2.72 volts after | ||
Line 21: | Line 23: | ||
1.36 volts as the amplitude. | 1.36 volts as the amplitude. | ||
Measurements - frequency - original wave | '''Measurements-''' frequency - original wave (f=1/T) | ||
1. Grid - | 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.* | |||
**Dr. Koch helped to explain calculate frequency from period and to use the | |||
functions on the oscilloscope** | |||
==Triggering== | |||
{{Side comment|comment=[[User:Steven J. Koch|Steven J. Koch]] 00:44, 29 August 2007 (EDT):Great description!}} | |||
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== | |||
{{Side comment|comment=[[User:Steven J. Koch|Steven J. Koch]] 00:51, 29 August 2007 (EDT):Excellent work on the AC coupling and in particular the calculation of the RC constant. I couldn't find anything when I tried either, but Antonio did find an article that looked promising.}} | |||
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>.1=(exp(-t/s))</math> where t is the | |||
fall off time calculated previously and s is the RC constant. Solving this equation I | |||
find s=22.5 milli sec. | |||
E)I was unable to find any information on the RC constant that I should expect on | |||
the internet. | |||
** Had help from TA in calculating the RC constant, and from Dr. Koch in using the | |||
correct equation to do so.** | |||
{{Side comment|comment=[[User:Steven J. Koch|Steven J. Koch]] 00:51, 29 August 2007 (EDT):Great work giving credit!}} | |||
==FFT== | |||
1)Using the FFT math function to find the frequency of a sine wave and with help from Zane | |||
Gibson, I find the frequency is 80Hz. Which matches up with what the wave generator is | |||
producing. | |||
2) |
Latest revision as of 21:36, 9 October 2007
see comment
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.* **Dr. Koch helped to explain calculate frequency from period and to use the functions on the oscilloscope**
Triggering
see comment
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
see comment
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=(exp(-t/s)) }[/math] where t is the
fall off time calculated previously and s is the RC constant. Solving this equation I
find s=22.5 milli sec.
E)I was unable to find any information on the RC constant that I should expect on
the internet.
** Had help from TA in calculating the RC constant, and from Dr. Koch in using the correct equation to do so.**
see comment
FFT
1)Using the FFT math function to find the frequency of a sine wave and with help from Zane Gibson, I find the frequency is 80Hz. Which matches up with what the wave generator is producing. 2)