Last night I bought a USB oscilloscope on ebay
it cost around $170US delivered and testing out the software - it is quite feature packed.
it is called the DSO-2090
DSO-2090 USB - Specifications
1. Max. sample rate Realtime sampling: 100MS/s
2. Bandwidth 40MHz(-3dB), Single shot bandwidth:40MHz
3. Buffer size 32K samples
4. Channels 2
5. Voltage Range:
- 10mV ~ 5V/div @ x1 probe
- 100mV ~ 50V/div @ x10 probe
- 1V ~ 500V/div @ x100 probe
- 10V ~ 5000V/div @ x1000 probe
7. Timebase range 4ns/div ~1h/div( 1-2-4 sequence)
11. Impedance 1M ohm
15. Resolution 8Bit
16. Range 10 divisions
17. Pre/Post trigger 0% ~ 100%
20. Autoset Yes
22. Trigger level +/-4 divisions
23. Measurements: Vp-p, Vmax, Vmin, Vmean, Vrms, Vamp, Vhigh, Vlow, positive overshoot, negative overshoot, cycle mean, cycle rms, period, frequency, positive pluse width, negative pulse width, rise time(10% ~ 90%), fall time(10% ~ 90%), positive duty cycle, negative duty cycle
24. Cursor Time/frequency difference, voltage difference
25. Math Addition, subtraction, multiplication, division
26. FFT Rectangular, Hanning, Hamming, Blackman Window
27. Interface Universal Serial Bus(USB2.0)
28. Power No external power source required.
29. Calibration Signal Ouput 2V, 1kHz, Square Wave
You can actually download and use the software for it in windows.
Just open it up and it will say error connecting to the oscilloscope, just click ignore and you can use it anyway - it will also present you with a demo sig gen, where you can change the frequency coming in and then use the scope.
I used it last night and thought it would be much better than my small screen oscilloscope. plus, you can pause the signal, save data etc...