OK, I know they are actually crap, but I think my sound card input can do better than this!
http://cgi.ebay.com/2-Channel-PC-Computer-Digital-mini-USB-Oscilloscope-/300544789091?pt=BI_Oscilloscopes&hash=item45f9dd8a63#ht_4792wt_802For US $33.95 you get:
Benefits:
2 channel input and synchronized display <-----Right, Iv'e never ever seen a scope that does that
Records date, time and voltage in text file <-----I can haz a Rigol than can outputs teh CSV FIL3
Measures range automatically <-----Auto mode is useless here because you can't use the scope at all!
4 available modes:
Low-pass filter mode, will get mains harmonics mode, computer crash mode and computer fire modeInput capture (trigger) function
Able to set any channel as the source of the capture (trigger) signal <-----Notice there is no external trigger.
Able to set rising or falling edge to capture (trigger) signal
Adjustable capture (trigger) signal level
Powered directly by USB port – no batteries or external power supply required <----- NO BATTERIES OR EXTERNAL POWER SUPPLY WILL GET FRIED, ONLY THE USB PORT WILL GET FRIED DIRECTLY.
Use with electronic teaching equipment <----PERFECT FOR TEACHING WHY ENGINEERS SHOULD ADD INPUT PROTECTION
Carry out acoustic tests and research <----- AS LONG AS YOU DO IT IN COWS, WILL NOT WORK ON MICE, YOU WILL SEE WHY IN THE TECH SPECS
Ideal for SCM development
Examine and repair apparatus and appliances
Technical Parameters:
PC connection: USB
Operating systems used: W2K, XP ,Windows 7(32bit) <----YOU KNOW IT'S CHINESE CRAP WHEN THEY CALLIT W2K
Signal input: BMC connection with universal oscillograph probe <----MISSPELLED BNC, OR INVENTED A NEW CONNECTOR
Max sampling: 8kHz x 1/ (4kHz x 2) <------ I CAN PLUG A SPEAKER IN AND TELL YOU WHAT FREQUENCY IS IT
Voltage: 5V USB port supply
Current: 60mA
Measurable frequency: 0Hz -----3kHz <------...
DIV array: horizontal 16DIV x vertical 10DIV
Input impedance: 1M?
Max voltage: 0---5V <-----NOW I NEED ONE OF THOSE X100 PROBES. OH, WAIT, I CAN GET A REAL SCOPE FOR THAT PRICE...
Error of voltage measurement: ±30mV <----- THAT'S 0.6% ACCURACY... AS LONG AS THEY THINK THE USB PORT'S VOLTAGE IS ±0.5%. DO YOU THEY THEY REALLY USE A VOLTAGE REFERENCE?
Adjustable range of time domain: 10 mS/DIV----10800 S/DIV <----WHAT WE WANT TO LOOK AT IS TINY LOGIC SIGNALS, NOT THE VOLTAGE ACROSS A BATTERY BEING CHARGED. THAT'S WHAT DATALOGGERS ARE FOR.
Error of time measurement: ±0.01%
Capacity of data record & save: 8388608 x 2
Max time of data record & save: 93 hours <------OR UNTIL THE CRAPPY SOFTWARE ALGORITHM FILLS UP YOUR RAM
Yeah, my very first forum rant
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/grin.gif)