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SainSmart DDS120 & DDS140 USB Oscilloscope
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bobi_dunkel:
Hi Cam,
Great , your dd120 is working you have problem with driver on xp. When you connect it to xp and go to computer management it will show as Buudai - Oscillagraph. Please don't use usb hub. Plug it directly to usb. Download this software Usbdeview http://www.portablefreeware.com/?id=1004.  Use it to remove any bad usb driver. Then reboot and you can install drivers again. You have to get device Buudai. Then it will work with ledioscope. After that we can solve the stock program issue.
MengPeng:
Hi Bobi!  Thanks so much for your reply, and I think you’re correct that my problem with Leidoskope not being able to open my DDS120 is that I don't have the correct driver installed.  I right-clicked on the DDS120 shown as "WinUsb Device (NULL)" in the Device Manager, checked its properties and saw that there were no drivers installed for this device! 
I downloaded USBDeview (cool program - thanks for showing me that!) and see the WinUsb (NULL) device in the list, but it shows that it’s not connected so nothing happened when I clicked on the red X to disconnect it.  So I tried disabling it, and rebooted.  My expectation was that this would delete the device's driver and that when I next connected the DDS120 I would be prompted by the New Hardware Wizard to point at a proper driver.  I was amazed to see that did not happen: when I connected the DDS120 I got no New Hardware message, and when I looked in the Device Manager, there was that "WinUsb Device (NULL)" again.  (I'm positive that's my DDS120, because when I unplug it, the "WinUsb Device (NULL)" disappears.)
So I gave up using USBDeview and tried updating the drivers by right-clicking on the device in Device Manager and selecting “Update Drivers”.  Then I browsed to the driver location (trying the driver from both from the install cd and the one in the package I downloaded from the Amazon page where they say to get the latest drivers), but the Hardware Update Wizard tells me the update was unsuccessful because it couldn't find a better match for the hardware than the currently installed driver.  Pretty puzzling since the Device Manager Properties says there’s no driver installed or required.  So right now I’m stymied?  Any ideas? 
One possibility is that maybe I’m not using USBDeview correctly:  I not sure what you mean “use it to remove any bad usb driver” – I could see that I could select my device and disable it, or disconnect it if it was connected, but couldn’t figure out how to remove a driver - maybe I’m missing something…  When I look at the properties using USBDeview, it says that there is a driver installed, WinUsb Device (NULL), v1.0.0.0, but I couldn’t delete it or anything..
Regards,
Cam
MengPeng:
I forgot to mention that USBDeviewer says my DDS120's device name is "USB102" in case that's important. 
doctormord:
USB102 is right.
MengPeng:
Thanks, Doctormord!  So as per USBDeview, Device Name is "USB102", Device Type is "WinUsb Device (NULL)" and that is all correct?  What about the Buudai Oscilloscope that Bobi mentioned?  I thought he meant that would be the name that Device Manager showed, but it appears I misunderstood.  Maybe that's the name his DDS120 shows in USBDeview?
Also, I thought it made sense what Bobi said about there being a driver error, because in Device Manager, it tells me there are no drivers installed for "WinUsb Device (NULL)"..  But I think I'll leave the driver issue alone for awhile, it's hurting my head.
If the drivers ARE ok, though, perhaps the problem is related to the fact that my DDS120 known as "USB102" is shown as not connected, even though it is!  Maybe that's why OpenHantek can't open it?  Anyway, I am learning a lot, mostly about how much I don't know! 
I really appreciate the help!
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