I got a dso nano, el cheapo pocket scope off ebay.

I have a homework assignment to find the values of a capacitor and inductor. I looked up the RC method online and tried it with funny results. I measured the voltage across the capacitor. the voltage was 10v, I want one time constant the first being 63%. so I did 10v / 100 * 63 and got 6.3 volts.

I put the cursor on this value (6.3v) to find the time at that point and put this time over the resistor of 2200 ohms. I got a time of 4.56mS this over 2237 ohms (measured value) I got .2uF

I measured the capacitor and got 1uF. I don't know what im doing wrong here. I want to show the spreadsheet but I have excel starter and I cant import the file, I have a nice little picture though!

the voltages at the bottom don't mean much (I think?)

it looks like it should but I cant find the correct value.

any help on what I may be doing wrong would be great

thanks

simon