- This topic has 2 replies, 2 voices, and was last updated 7 years, 2 months ago by Anonymous.
- July 11, 2016 at 1:36 pm #10606Owen BrinkerhoffGuest
Hello James and everyone else, just thought I would give my impression of the new beta. All of my observations happen in graph mode at 8000hz sample rate. First I have always had some problem with the meter disconnecting graph mode but it is much worse now. Second I don’t see a way to disable one channel, but I do like the auto-scaling choice. Third is not a new problem and it might not be curable. I still see noise that peaks into the +-10 to +- 15 mv dc range in buffer mode with no leads attached. I don’t think I can trust the meter to give accurate AC power values using a magnetic pick up unless a solution is found for this problem. Sorry about being a broken record on that last one. I am just hoping.
- July 12, 2016 at 3:15 pm #10628adminKeymaster
I wanted to let you know I’ve bought a Samsung Android 6 device to test with, it should be here in the next few days. I hope to reproduce the graphing disconnection you’re seeing, because I haven’t been able to so far.
Regarding disabling one channel in graph mode: I just turn off the autofitting and swipe the channel I don’t want out of range. I didn’t want to add more controls than necessary.
Noise in buffer: I’m about 90% sure that what you’re seeing is the intrinsic sampling noise. If I set a meter on my desk to 8000Hz+256 samples, 60V input, I get a noise profile that looks like this:
Is this consistent with what you’re seeing?
Sorry this post doesn’t have any solutions, just trying to fully grok the problems.
- July 15, 2016 at 4:42 pm #10672AnonymousGuest
Hi James, yes the sample noise is about the same. That noise is a problem for ac current and power measurement. I guess the other solution would be to have a higher signal level for the magnetic pickup. I don’t know if something like that exists 100 mv per amp would work. I’ll look for something like that.