<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
103 79 415022 12 80 537255 13 77 468773 13 13-JUN-07
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-103</b></i><br /></font>

Thr_Max in register units for M3R4-103

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 82 77 84 83 84 76 75 81 76 87 80 83 75 74 75 74
FEB-2 82 82 83 81 77 81 78 80 79 84 84 80 75 73 84 80
FEB-3 83 76 76 78 77 76 81 76 78 71 85 79 75 71 78 72
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-103</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-103

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 454539 631680 437843 431760 373776 358361 365260 418550 452451 362487 249331 336168 292121 452141 460716 563168
FEB-2 440567 607771 515607 903436 506841 640933 333367 550742 323081 477535 467037 517390 610462 452921 547563 700829
FEB-3 495664 547610 534924 426449 400586 426958 321891 368129 321508 662037 379890 409064 330443 622717 625968 626522
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-103</b></i><br /></font>

D_100 - in register units for M3R4-103

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 12 13 13 12 12 12 12 11 12 11 11 11 10 12 13 12
FEB-2 13 13 12 14 12 13 12 12 11 12 12 13 15 12 13 13
FEB-3 12 13 14 13 13 11 12 12 12 12 13 13 12 12 14 13
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-103</b></i></font>

Noise counts vs Thresholds. M3R4-103


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. M3R4-103</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-103

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