<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
137 79 585058 14 76 520711 14 73 464469 12 05-FEB-07 Sens=7.5mV/fc Th=15fc
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-137</b></i><br /></font>

Thr_Max in register units for M3R4-137

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 75 73 87 73 87 69 82 69 84 71 85 79 86 74 87 76
FEB-2 77 84 65 82 72 77 68 83 62 85 76 80 76 77 73 71
FEB-3 74 71 81 75 77 64 76 73 70 72 71 72 70 72 76 72
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-137</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-137

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 517856 518473 452749 535915 613539 550454 487766 361164 609394 437243 597186 614719 887069 529998 812749 834656
FEB-2 681486 696813 382043 361832 384315 439471 385745 364398 465792 349839 555856 621110 628915 759699 692794 561267
FEB-3 604896 642785 400077 532397 354180 420972 300348 278949 357608 282089 350506 487014 423430 522332 638213 835702
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-137</b></i><br /></font>

D_100 - in register units for M3R4-137

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 14 13 13 12 14 14 14 13 12 15 12 15 15
FEB-2 15 14 12 13 13 14 12 12 14 12 13 14 15 14 15 14
FEB-3 13 13 13 13 10 13 12 11 10 11 11 12 12 13 14 14
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-137</b></i></font>

Noise counts vs Thresholds. M3R4-137


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. M3R4-137</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-137

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