This elog is the first reliable. Before, the histograms have not been zero'd

Each test are done and compared for AIDA05.1.8L, compared with the pulser (caracteristics, see attachment1)

Test 1: with HT cables shielded

Attachment 2: HT = 100V; cable AIDA05 connected --> FWHM = 77 channels (= 51.3 keV) with a top of the curve at 100 cts (AIDA9.1.8L has also been checked and was at 89 channels)

Attachment 3: HT = 0V; cable AIDA05 connected --> FWHM = 1757 channels with a top of the curve at 15 cts after almost 40 min because the noise had a baseline of 6500 channels

Attachment 4: HT = 0V; cable AIDA05 disconnected --> FWHM = 16 channels with a top of the curve at 110 cts

Attachment 5: HT = 100V; cable AIDA05 disconnected --> FWHM = 17 channels with a top of the curve at 110 cts

Test 2: with HT cables not shielded

Attachment 6: HT = 0V; cable AIDA05 connected --> FWHM = 1452 channels (968 keV) with a top of the curve at 23 cts after 1:15 hours because the noise had a baseline of 7000 channels

Attachment 7: HT = 100V; cable AIDA05 connected --> FWHM = 73 channels with a top of the curve at 100 cts

Attachment 8: HT = 0V; cable AIDA05 disconnected --> FWHM = 15 channels with a top of the curve at 120 cts

Attachment 9: HT = 100V; cable AIDA05 disconnected --> FWHM = 16 channels with a top of the curve at 125 cts

Conclusion: with shielded or unshielded cables, the noise situation seems to be the same, proving that mot of the noise don't come from the cables

Other thing that have been noticed is that the peak of the pulser is shifted when the cables are connected compared to when they are not connected: connected: peak at around channel 21675; disconnected: peak at around channel 21925