As turned out during the Seismometer Calibration Workshop (September 2005) there are some high-gain setups (both for broadband and short-period sensors) that can not take the amount of tilt and/or step velocity that the "native" CT-EW1 table produces.

Consequently, we implemented two different remedies for this situation. A separate T-shaped extension bridge can be used to divide the amount of tilt by 2, 4, 8, or 16. According to Prof. Wielandt's calculations, using 1/16 of the original tilt should work with even the highest sensitivity versions of STS-2 and CMG-3 seismometers.

For short-period seismometers it was found that vertical velocity could be a problem, especially in combination with hefty preamplifiers in the signal path. For the GERESS setup with high-gain S-13's and a factor 30 preamplifier in front of the digitizer proper, the native step velocity in low gear was too high but not by a great deal. A simple "damping plug" can be connected in between the remote control box and the CT-EW1 table, reducing motor voltage by about a factor of two. Bingo - half speed, no more problems.