Hi,
After assembling the unit V4 voltage was only at 0.9V. I checked R13,R14 and R15 and they were all fine.
I reflowed the solder on the analog switch and op amp leads and then I measured 1.4V at V4, hopefully this is high enough.
The issue I have now is that 5V/Div is the only setting that gives a stable trace.
I am using a signal generator 600 ohm output to provide a test signal.
If I use any setting other than 5V/Div the trace goes completely unstable with large spikes causing the trace to basically swamp the screen.
Any hints on what may be causing this?
Thanks in advance,
John
5V/Div is only stable setting
Re: 5V/Div is only stable setting
Can you post a photo showing the issue? We had similar report about large spikes displayed for some sensitivity settings and the phenomenal appeared power supply related. If you can please try a different power supply.
Re: 5V/Div is only stable setting
I tried the scope on another power supply and success! Seems the issue is something to do with my bench power supply.
Thanks for your assistance.
Thanks for your assistance.