Search found 5 matches

by QMSteve
Thu Feb 26, 2009 4:06 pm
Forum: USB PC Oscilloscopes
Topic: PS3205 occasionally not recognised
Replies: 8
Views: 5124

Thanks Ziko This did help slightly, as now we only have one plug to pull to return the scope to a state where it can be recognised. What we would really love to be able to do is programmatically send something to the USB port or the scope to completely reset the USB interface hardware, as if we pull...
by QMSteve
Fri Feb 13, 2009 9:48 am
Forum: USB PC Oscilloscopes
Topic: PS3205 occasionally not recognised
Replies: 8
Views: 5124

Hi Ziko The 3205 is powered from the 12V input, using the same PSU as the PC. This means that, when the system is powered on, 12V is applied to the 3205 and the PC simultaneously and, during power-down, 12V is still present after the PC has shut down. Once the PC has shut down, it can only be restar...
by QMSteve
Thu Feb 05, 2009 11:50 am
Forum: USB PC Oscilloscopes
Topic: PS3205 occasionally not recognised
Replies: 8
Views: 5124

Hi Ziko. We only use the screen saver to switch off the display after 20 minutes. There is no hibernate mode. The PC is shut down from Windows and then needs the power to the whole system to be switched off and back on to start it. The PC is a panel PC which runs on an external 12V supply which it s...
by QMSteve
Mon Feb 02, 2009 12:28 pm
Forum: USB PC Oscilloscopes
Topic: Ground problem
Replies: 8
Views: 12882

I would agree with Sarah that disconnecting the ground and +5V from the USB cable would be a singularly bad idea. The scope may operate OK without bus power, but still needs a reference for the two data lines (think of it as similar to RS485). It is also worth remembering that most if not all USB is...
by QMSteve
Fri Jan 30, 2009 10:45 am
Forum: USB PC Oscilloscopes
Topic: PS3205 occasionally not recognised
Replies: 8
Views: 5124

PS3205 occasionally not recognised

Occasionally, our PS3205 is not recognised in Windows XP. We can induce this by jiggling the mouse around during boot-up. The Device Manager lists an unknown device with VID=0000 and PID=0000. Unplugging the USB cable to the scope causes this device to disappear from the list. Plugging it back in ca...