<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
181 79 441314 12 84 626117 14 88 509745 13 15-DEC-06 Sens=7.5mV/fc Th=15fc
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-181</b></i><br /></font>

Thr_Max in register units for M3R4-181

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 77 77 81 77 86 76 76 68 83 70 86 78 82 81 81 85
FEB-2 85 78 83 85 86 90 83 85 91 80 90 79 83 79 73 87
FEB-3 88 87 92 91 89 79 84 86 90 91 86 92 85 93 87 86
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-181</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-181

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 520590 518639 482618 375190 584011 454066 345665 309847 322190 353313 394738 262280 558120 472462 670860 436431
FEB-2 448007 741315 539028 602708 642614 610851 368571 701299 441021 518503 778561 726297 675174 569446 1016068 638402
FEB-3 461178 624769 498685 399137 573143 530729 371889 388699 350687 478179 683795 423800 496830 616079 679787 578533
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-181</b></i><br /></font>

D_100 - in register units for M3R4-181

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 14 14 12 13 12 12 12 11 12 12 12 11 12 13 13 13
FEB-2 12 15 13 14 14 15 12 14 12 14 14 16 12 14 15 14
FEB-3 13 14 12 13 13 13 12 12 12 12 13 13 12 13 15 14
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-181</b></i></font>

Noise counts vs Thresholds. M3R4-181


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. M3R4-181</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-181

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