<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
100 83 578074 13 80 498004 12 81 493019 12 18-MAR-07
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-100</b></i><br /></font>

Thr_Max in register units for M3R4-100

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 83 85 79 81 84 83 77 87 78 88 81 82 84 80 88 90
FEB-2 74 86 82 78 83 82 84 75 83 77 88 78 80 77 83 74
FEB-3 85 76 77 84 78 85 77 85 74 84 81 85 76 77 89 82
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-100</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-100

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 540629 778275 628025 539109 445157 690018 491060 463417 522572 577729 395488 557442 458124 676436 556473 929232
FEB-2 491431 720144 372528 380849 454637 625575 563112 289625 392933 317449 375595 499632 451130 567482 495487 970460
FEB-3 435849 589225 314615 371625 485369 507035 329854 803013 380165 367059 362795 405826 478243 624645 694132 738854
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-100</b></i><br /></font>

D_100 - in register units for M3R4-100

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 14 13 13 13 13 12 12 15 13 15 13 13 14 14
FEB-2 13 13 11 12 13 12 10 10 11 11 12 11 11 13 13 13
FEB-3 12 13 11 12 13 12 12 13 12 12 12 12 11 13 14 12
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-100</b></i></font>

Noise counts vs Thresholds. M3R4-100


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. M3R4-100</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-100

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