I dug this out the other day as I needed to use a handheld scope for something.
Did the CH2 issue ever get resolved on any firmware versions?
If I ever use Auto on mine it will always default to CH2 for controls even though there is nothing connected to CH2, makes it a real PITA to adjust the timebase for CH1 as I have to keep manually selecting CH1. Or I get the annoying message "Channel 2 is Off"
Mine is:
PCB V2.20
Firmware: V4.2.0
From all that I've read to this point, there hasn't been a fix for a firmware version that would run on the V2.20 PCB. It has supposedly been fixed as some point for the firmware for later board models. I also understand you could brick the unit if you try to load firmware not made for that board version.
The
workaround that I used was to simply hit the AUTO button a second time to toggle the "focus" back to channel-1 (see exception below).
Note that the
scope mode has four different display modes (for lack of a better way to put it), and each of those modes will dictate what the blue arrow keys and the "F" keys do.
They are: CH1/2, HOR, Trig, Measure/Range. Each of these modes will highlight their respective function on the screen.
I found that the toggle to CH2 when hitting the AUTO button
ONLY happens when the screen indicates that it's in the CH1/2 mode. In all other modes, it works as it should.
Looking at the screen highlights prior to pressing the AUTO button makes it a little less frustrating because you'll know what to expect and whether to hit the AUTO button a second time.