pncconf 2.8

Hello,
I am running into a problem and lack of understanding of the jitter test.
I configured the previous version of linuxcnc and was able to get everything on my router working fairly clean, steppers stepped smooth no jitter or quivering.

In version 2.8:
Question 1 - the jitter test, what number do I insert into the wizard, it implies the max jitter of the servo thread but it expects a number around 1,000,000 so do I put max interval of the servo thread?
Question 2 - This is part of question 1, my steppers when idle keep quivering and moving. I used the same settings I used in 2.7. I also noticed the PID P=6000 and read it should be 1000 (base thread speed) this reduced it but did not eliminate it.
Question 3 - assumed 2.8 is like 2.7 the linuxcnc opening display shows axis 0,1,2,3 (xyyz) and once individually homed they change to X,Y,Z. My Y needs to be homed together.
I have no hal file yet as I am in the middle of the wizard.

Thanks

P should be 1/servo_thread_period so 1000 for a
normal 1 ms (1000000 ns) servo thread period.

Pncconf should probably not make the servo thread
timing settable as this causes a lot of initial setup issues

If you have oscillation its likely you still have P
too high on some axis.

Also as tommylight says: pid.maxerror 0,0005
is incorrect for metric systems (this is a bug in older
pncconf versions) pid.maxerror 0.0005 is fine for imperial
systems, pid.maxerror 0.0127 is appropriate for metric
systems.

A P higher than 2/servo_thread_period will always
cause oscillations

Thanks tommylight & PCW.

It reduced the problem but did not eliminate it. At the end of the deceleration it now quivers for about half a second. Changing any of the values on the test axis window made any difference. I started messing with the PID tab and put the value of 1 into one of the fields and the X rapid to the max and kept going so I cut power to the machine and that was the last it moved. The ethernet now shows disconnected and will not connect, I will reboot.

I have a few other issues happening slowing my testing. I will work on them later today. The home switches are producing switch errors when hit. I will check the 2.7 hal and compare to the 2.8 hal to see. I did notice it was different. In pncconf the switches are configured as home/limit.

Can you post your hal and ini files? That would speed debugging any motion issues

attached is hal & ini

a couple errors:

#setp pid.x.error-previous-target true
this should not be commented out (for any axis)

and
on Joint 0, you have

FF1 = 0
this must be
FF1 = 1

Thank you that solved that problem.