| 1. |
The Test Cord vs the Scope Probe:
The Test Cord is a simple connection between the alligator clip
and the plug.
The Scope Probe has a 1:11 ratio voltage divider built into it. |
| 2. |
Here are the Wave Files You Need.
Both files contain 60 second length 1 KHz Sine Wave, a 450 Hz Sine
Wave and a 270 Hz Sine Wave.
If you have a high speed connection - Freqs
Large.zip
If you have a slower connection - Freqs
Small.zip
A source that you canI
use to create your own standard frequencies is available at
http://kusmierek.republika.pl/pq/en.html
I must emphasize that you want to keep the standard signals as
analog Wave Files.
Create an "Audio CD" with Wave Files. Only
an Audio CD will access the earphone jack on the front of
the cd.
Do Not convert them to MPG format; you are creating a digitized
file that will provide different results.
Create an Audio CD that will run on your CD / DVD player. |
| 3. |
Expect nearly the same voltages for the different frequencies.
For example on my system,
At full volume from
the
HEADPHONE Output |
1000 Hz produces .935 V AC ( 935 mV AC)
450 Hz produces .961 V AC ( 961 mV AC)
270 Hz produces .967 V AC ( 967 mV AC) |
|
|
At full volume from
the
SPEAKER Output |
1000 Hz produces 2.24 V AC
450 Hz produces 2.27 V AC
270 Hz produces 2.27 V AC |
The differences in the voltage are not significant.
|
| 4. |
This is not a question but does hold very important information.
Be sure to read it.
|
| 5. |
Same as #4. It has important information.
|
| 6. |
Set 1000 Hz at 250 mV. Now, without changing the volume
control, change the output file to 450 Hz. Upon remeasuring,
you will notice that the voltage between the signals change slightly, but
not significantly as you change frequency.
|
| 7. |
Same here as # 6
|
| 8. |
Just look at the output of a music cd on winscope. |
