Preamplifier and signal cable testing

We check all signal cables,the flat cable connector to BNC 
from ORNL/UTK and they are OK.

While checking the preamplifiers (PA) we realized that on the oscilloscope
some of the channels shown pulses without a load when HV is on.
After some checks, we come to the conclusion that is a kind of discharge
on the HV part of the preamp (which appears as positive pulse or negative pulses)
and induce pulses of opposite sign in one or mos neighbouring channels.
After systematically investigating them in the scope, we plug them in the DACQ
to record the spectra. For this we include an additional digitizer SIS3316
to connect al1 channel preamps
PA1(D):UPC:SN-0808223 -> V1A1
PA2(D):GSI:SN-1112572 -> V1A2
PA3(D):UPC:SN-0310315 -> V1A3
PA4(D):UPC:SN-0808220 -> V1A4
PA5(U):UTK: ? -> V1A5
PA6(U):UTK:SN-0808218 -> V1A6
PA7(U):UTK:SN-0713586 -> V1A7
PA8(U):UTK:SN-0808221 -> V2A1, V2A2
PA9(U):UTK:SN-0808215 -> V2A3, V2A4
PA10(U):UTK:SN-0808217 -> V2A5, V2A6

We measure first with a tube of each type connected to Ch#1 of each PA
to adjust parameters of digitizers and range
List-mode: 160717_preampCheck_000.dlt
On-line: 160717_preampCheck.root

Then we remove the tube from Ch#1 to see the effect in this channel:
List-mode: 160717_preampCheck_noTubes_001.dlt
On-line: 160717_preampCheck_noTubes.root

We attach screenshots for both as compressed files (.zip)
and the root files