Hello to everybody.
I have received my Knick JS300 a few days ago and was very pleased about its very good working condition.
Pictures 1 and 2 are showing the stability over 5 hours 9 minutes and 15 seconds.
After that time, the logging values dropped down to a value of about 8.6 Volts immediately, what means from the last good scanned value directly to the failure conditioned values.
As a reason for that I found that a Tantalum capacitor showing a short circuit value and exchanged it together with another one that is connected in parallel.
Then I restarted the logging procedure for about 13 hours.
While I was observing the values taken, I became more and more disappointed.
Pictures 3 and 4 will show you why.
After first attempts of repairing, the Short Time Drift is now at least ten times higher than before.
But that is not all the bad news, because the rise of drift is not showing to have any asymptotic limit.
Unfortunately I do not have any servicing information for the JS300.
However, Knick Berlin send me the Owner Manual only and said that other documents are no longer available.
Is there anybody who will help me and share his documentation ?