<i>Thresholds Scan<br />185 M3R4 chambers passed the tests</i></font>

Thresholds Scan
185 M3R4 chambers passed the tests
Tables below present:
- Thr_Max(r.u.), Thresholds in register units at Maximum of noise rate;
- N_Max, Noise rate at Thr_Max in counts/sec;
- D_100 = Thr_100(r.u.) - Thr_Max(r.u.) where Thr_100(r.u.) is the threshold in register units at noise rate = 100/s.
 The following expression relates the real threshold (measured from the base-line of physical signals) with the thresholds determined by the register units:
Thr(fC)*S(r.u./fC) = Thr(r.u.) - Thr_Max(r.u.)+ OFFSet(r.u.).
 Here, OFFSet=17 register units;
S=3.40 r.u./fC is the charge sensitivity corresponding to S=8mV/fC taken for M3R4 chambers;
(Note, that 1 register unit = 2.35 mV)
FEB-1. Mean values. FEB-2. Mean values. FEB-3. Mean values.
Chamber Thr_Max
[r.u.]		 N_Max
[counts/s]		 D_100
[r.u.]		 Thr_Max
[r.u.]		 N_Max
[counts/s]		 D_100
[r.u.]		 Thr_Max
[r.u.]		 N_Max
[counts/s]		 D_100
[r.u.]		 Test Date Plots Comments
25 77 533485 14 78 521195 14 87 467371 12 28-JUN-07
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-25</b></i><br /></font>

Thr_Max in register units for M3R4-25

FEB
Channels		 Ch_1 Ch_2 Ch_3 Ch_4 Ch_5 Ch_6 Ch_7 Ch_8 Ch_9 Ch_10 Ch_11 Ch_12 Ch_13 Ch_14 Ch_15 Ch_16
FEB-1 73 76 80 73 79 75 76 76 83 77 75 75 75 80 74 86
FEB-2 73 89 76 77 74 81 81 73 66 87 70 83 82 84 82 75
FEB-3 77 88 81 97 76 91 84 98 86 87 84 91 85 90 81 88
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-25</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-25

FEB
Channels		 Ch_1 Ch_2 Ch_3 Ch_4 Ch_5 Ch_6 Ch_7 Ch_8 Ch_9 Ch_10 Ch_11 Ch_12 Ch_13 Ch_14 Ch_15 Ch_16
FEB-1 585422 672096 516110 467910 460127 424332 672681 451287 446669 395967 550026 429500 503909 603824 587356 768547
FEB-2 534407 657775 334601 477902 423722 759355 458876 596929 431104 472346 456952 453923 478134 547917 599244 655931
FEB-3 447807 538732 443927 534215 374814 542196 424446 375466 238029 390015 428935 405848 412613 608991 560155 751746
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-25</b></i><br /></font>

D_100 - in register units for M3R4-25

FEB
Channels		 Ch_1 Ch_2 Ch_3 Ch_4 Ch_5 Ch_6 Ch_7 Ch_8 Ch_9 Ch_10 Ch_11 Ch_12 Ch_13 Ch_14 Ch_15 Ch_16
FEB-1 16 16 15 14 14 13 15 14 14 12 14 13 14 13 14 14
FEB-2 14 14 13 12 13 14 14 15 12 14 13 12 15 14 15 13
FEB-3 13 13 13 13 12 12 12 12 11 12 11 11 11 13 13 12
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-25</b></i></font>

Noise counts vs Thresholds. M3R4-25


Noise rates vs Thresholds for FEB-1 Noise rates vs Thresholds for FEB-2 Noise rates vs Thresholds for FEB-3
<font color="DarkRed" size="5"><i><b>PLOTS of Thresholds Scan Results. M3R4-25</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-25

Scan results for FEB-1 (left plots), for FEB-2 (middle plots), for FEB-3 (right plots).
Thr_Max vs channel number (upper plot)
N_Max vs channel number (middle plot)
D_100 vs channel number (lower plot)
For comments, contact: Petr.Neustroev@cern.ch