Hi Tom, thanks very much for your input. Bellow just a quick follow up.
On Wed, Oct 31, 2018 at 04:08 PM, Tom Gardner wrote:
Highly unlikely the 10MHz is incorrect - but you can always measure it on yourIs there a test point designated on A5 to check on the 10MHz oscillator?
Just for fun and while I am at A5, might as well check that, although after reading Chuck's detailed explanation on how the scope actually performs the frequency measurements, the 10MHz is not used in the process, and I suspect that it will be within spec.
What's more likely is that the A5 voltages and/or calibration values areYes, at the time of making those measurements both the positive and negative voltage reference values where/are still off. Did not want to touch the adjustment until the two 10.0K 0.1% resistors that where damaged by the leaking caps are replaced with the correct parts. They should arrive sometime this week, and once they are in, I will tweak R2010 to set the reference voltages to +1.36v and -1.25v.