I'm analysing several measurements taken with a SR830 lockin amplifier.
These measurements look similar to this one. Since I'm interrested in the derivative of the signal I took the numerical difference. What I found was this. One can clearly see two bands in the signal. I'm no expert, but I'm guessing it might be related to digitalisation in the lock-in amplifier.
So this leads me to two questions:
- What could be the origin of these two bands and how to avoid them in the first place?
- How should I correct the data already taken?