I’m having a problem with my Quad, HW version 2.70.
I design induction heaters (fluxeon com) which are directly line powered and involve high voltage. I was using the quad to read a current transformer on a high voltage well insulated line. I’ve done this many times. In fact, I have a dedicated probe. Dedicated because the burden resistor got hot enough to melt the probe
I was watching the current waveform when the screen suddenly went negative. That is, like a photographic negative. Colors and light and dark areas reversed. Tonight I reflashed the scope using these http://www.seeedstudio.com/wiki/DSO_Quad:Upgrading_Firmware instructions.
That fixed the inverted colors but the contrast is still off. The screen looks perfect if I move my head about 45 deg to the left.
So my question is, is there a way to set the screen contrast? I can use the scope this way but it was MUCH nicer before.