Big board for the long prototype - to be tested with gas
Short prototype - HV stability issues understood - bug in the design of HV board, can be fixed on the existing boards by applying glue in a problematic groove, new boards are already correct
- Signal - pedestal = average between 0.3-0.6 ms
- saturated signals are observed with voltage above 1450V - Michal K. confirmed that the same was seen with NA62 straws only in b154, not in the cavern
- Channel 1 is different - not understood (not wire tension, no known difference between this straw and others)
- wire tension whould be remeasured
- measure with Fe55 in different positions along the straw
- 70um kapton tape used to disconnect this channel for further measurements
- stable pedestal values
- all measurements are done with termination board
- trailing time resolution is about 7ns (for straws 2-4)
