Search found 3 matches
- Thu Mar 22, 2018 5:39 am
- Forum: DSO138
- Topic: Triggering at 50ms per division and below
- Replies: 33
- Views: 48961
Re: Triggering at 50ms per division and below
My opinion is that if nobody is prepared to try the new version with the improved trigger functionality ( which several people have been asking for! ), then we have no excuse to complain if there is a bug or expect a fix after it is released. I found the document "DSO138: How to upgrade firmwa...
- Thu Mar 22, 2018 4:47 am
- Forum: DSO138
- Topic: Ground Drift
- Replies: 2
- Views: 4028
Re: Ground Drift
Is your DC power supply voltage greater than 8 volts? If not, the trace may drift down as the power supply voltage drops. For my DSO138, the DC voltage needs to be greater than 7.8 volts. I run it off an 8.4v NiCd battery.
- Wed Jul 19, 2017 4:15 pm
- Forum: DSO138
- Topic: Triggering at 50ms per division and below
- Replies: 33
- Views: 48961
Re: Triggering at 50ms per division and below
I also found that the trigger circuit works at 20msec or faster, but not at 50msec or slower. Am looking at signals in the 1 - 10Hz range. Would also be interested in a fix, can something be done with the circuit at pin 13 of the op amp, such as increasing C9?