And about displayed frequency:
Connect the probe to signal generator
Set to Peak detect.
Set Signal generator to Square and 1 -> 10 KHz
Check displayed frequency on scope.
Set Signal generator to Square and 70 -> 80 KHz
Check displayed frequency on scope.
(Optional: use Auto button, change frequency on signal generator and check the result on scope).
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Peak detect in use. Also, notice the arrow that shows trigger level on right.
Sorry my friend, I can't help you. I understand you have certain expectations and that the HDS272 is failing to meet them.
To me, this is not a defect, the peak detect mode is working as it should and the added captured data happens to be tripping up the freq display. The easy answer to getting a stable reading on the freq display is to simply use sample/normal mode. This device meets Owon's published specification and I find it to be quite a handy and unique tool at this price point.
I can tell you that FW Version 5.4.0 the freq display is still behaving in a manner that you would call defective. There may be a newer version available that might address your concerns.
One thing I noticed from other people's attempt to get new firmware, and the responses from Owon, it would
not be a surprise to discover that there MAY be limited
backward-compatibility between firmware versions. After all, they've had
at least three different versions of the PCB in less than a year's time, multiple FW changes, a known display screen change, the addition of post-production parasite components and a less that willing to attitude to dispense firmware updates (or even communicate).
One could only imagine the cost of technician/programmer/language translator time needed to support years of
previous designs across their global product offerings, not to mention component obsolescence. It's much cheaper to ignore the requests unless there's a real problem that could impact current sales. That's how they can sell these units for less (sometimes much less) than $200.
If potential FW compatibility or lack of customer support is an issue, and you have a window of opportunity to return them, you might consider doing so before that window closes. Best of luck!
Regards