<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
131 80 584199 13 75 557533 13 75 370146 11 02-FEB-07 Sens=7.5mV/fc Th=15fc
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-131</b></i><br /></font>

Thr_Max in register units for M3R4-131

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 87 73 91 74 84 72 79 76 83 84 80 75 89 80 80
FEB-2 74 77 75 81 76 76 67 72 79 83 74 80 70 76 74 70
FEB-3 71 75 83 73 77 84 70 78 77 76 77 71 75 77 70 72
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-131</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-131

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 456712 539684 436744 475858 358375 393338 422869 413949 632133 450460 713946 457661 816572 848222 852182 1078474
FEB-2 471477 679182 406402 586532 677894 428178 448217 330802 522365 556281 568016 473380 582902 810401 811575 566921
FEB-3 381151 476243 241069 323315 246847 260299 443381 298046 226474 202606 367335 435560 556957 473103 548102 441840
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-131</b></i><br /></font>

D_100 - in register units for M3R4-131

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 13 14 13 13 11 12 12 12 12 13 14 13 15 15 16 16
FEB-2 14 15 12 12 14 13 14 12 14 14 13 13 13 12 15 13
FEB-3 13 13 11 11 11 11 12 11 10 10 10 12 13 10 12 12
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-131</b></i></font>

Noise counts vs Thresholds. M3R4-131


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. M3R4-131</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-131

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