Hello Martin
Hi Heribert
I've been using the older OpenHantek for about a year and just discovered your work. Impressive work you've done!
But (there is always a but) I can't operate it with my Windows 10 tablet because all the GUI controls now are so small/tiny.
I have to use a mouse - pointer which isn't possible. Is there any chance, to enlarge the controls more touching convenient?
This is not so easy to accomplish with the used QT widgets, as stated by Qt:
Qt Widgets are traditional user interface elements that are typically found in desktop environments. The widgets integrate well to the underlying platform providing native look'n'feel on Windows, Linux and macOS. The widgets are mature and feature rich user interface elements suitable for mostly static user interfaces. In contrast to Qt Quick, the widgets do not scale that well for touch screens and fluid, highly animated modern user interfaces. The widgets are a good choice for applications with traditional desktop centric user interfaces, such as office type applications.
My tablet has only one USB port. So I bought a chinese-cheap (MW7211a-controlled) active powered USB-Hub.
But no luck. The older OpenHantek led W10 to a crash and your OH (WinUSB-driver from Zadig) led to a disconnect, every time I switch to the USB-Hub. My guess: It's driver related, because other connected devices worked.
That behaviour is caused by the hi speed USB communication that nearly saturates the bus. The Hantek6022 hardware must transfer large chunks of data in real time as the scope has no internal buffer. If the transfer is interrupted (e.g. by other devices on the same bus due to the hub) the communication stops and all kind of nasty things happen. (Think of formula one racing with zebra crossings for pedestrians.)
A general rule for Hantek6022: connect it to a USB plug that owns its bus alone (e.g. the linux command
lsusb shows which device is on which bus, dunno how to do this for Windows).
I know that this doesn't help you with your single USB plug
- BUT - did you think about using a bluetooth mouse?
BTW: I anymore do not want to use the 6022 with a PSU somewhere attached. This is extremely dangerous.
I fried this unit and my netbook too due to USB earth/ground hell.
I want to measure carefree, battery driven.
Run your tablet on battery and use the strange Y-cable supplied with the scope - black plug into tablet and red plug into a USB power bank - this is how I use my scope together with my Android phone and the
HScope app.
But this frying of your test gear is no specific Hantek problem, you also can fry every other real scope - even the most expensive ones - when you connect it to dangerous voltages like the mains - always keep in mind that the scope's GND is connected to the computer's GND that in turn is connected to the mains PE!
I saw a dangerous
"solution" in some laboratories where the die-hard volt-nuts used insulating tape on the PE of the (Schuko-)plug of their Hameg or Tek scope to avoid this kind of
"earth/ground hell" but this is life-threatening -
never do it.
The safe solution is always the insulation transformer for the DUT.
The measure inputs are overvoltage-protected up to ± 35 V when directly connected and ± 350 V when using the X10 probe (the measurable input range is ± 5 V / ± 50 V).
For measuring mains and tube circuits I use a DIY 1:100 divider that allows to measure ± 500 V. This box also has a dedicated GND connector
I also added a dedicated GND plug to my Hantek6022BE - a simple blank 4mm banana socket screwed directly into the side of the aluminium housing where I can plug a direct GND connection. This allows the possible failure current (caused by connecting the GND crocodile to high voltage) to flow directly to GND instead of using the destructive
long run through scope, USB cable, computer and PSU into the mains plug.
Also check this thread:
How to probe audio amp output with a scope?Martin