Hey, about PC Oscilloscopes, I dont know anything... is good this one? Costs USD 72 + 12 (shippment) on ebay.


5 Channel Portable PC USB 2.0 Oscilloscope + CD New

View signal voltages wherever you are with this easily portable 5 channel oscilloscope which plugs into your PC’s USB port making this an ideal unit for both field and lab work.

Applications
Use with electronic teaching equipment
Acoustic tests and research
SCM development
Examine and repair apparatus and appliances
The portable oscilloscope is easily potable and takes its power directly from the USB port – no batteries or other external power supply is required.

Benefits:
5 channel input and synchronised display
Measure range automatically with 4 available modes
Input capture (trigger) function
Any channel may be set as the source of capture (trigger) signal
Either rising or falling edge can be set to capture (trigger) signal
Adjustable capture (trigger) signal level
Saves data on hard disk and system will automatically summon data when started
Specifications:
Computer connection USB 2.0
Signal input BNC connection with universal oscillograph probe
Max sampling rate 150k
Voltage 5V USB port supply
Current 170mA
Frequency measurement range 0Hz - 50KHz
DIV array Horizontal 16DIV * vertical 10DIV
Adjustable voltage range 10mV/DIV-----100mV/DIV
Input impedance 1MΩ
Max display range ± 8DIV
Max measuring voltage ± 800MV, ± 8V when probe is X10
Voltage measurement error ± 2.5%
Vertical baseline adjustable range 6DIV
Time domain adjustable range 100uS/DIV—-8192S/DIV
Time domain error ± 0.1%
Data record and save capacity 8388608 * 5
Max data record and save time 93 hours