<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
125 75 587852 13 80 679502 14 75 661134 14 01-FEB-07 Sens=7.5mV/fc Th=15fc
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-125</b></i><br /></font>

Thr_Max in register units for M3R4-125

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 81 80 78 67 82 74 69 72 80 73 77 68 76 70 80
FEB-2 80 85 83 83 72 79 77 83 80 84 85 81 76 85 76 73
FEB-3 73 81 68 79 74 75 73 74 71 79 78 76 80 71 70 76
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-125</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-125

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 462902 839717 629370 670757 312619 722110 472176 479541 507803 423265 613067 638621 505733 608176 806811 712964
FEB-2 566134 760623 809530 728362 591671 562840 537404 470904 708389 546814 683869 584694 702077 628931 1115052 874732
FEB-3 563959 625208 583033 717981 779874 659462 419672 481287 999045 367096 942598 689260 634687 653722 778168 683086
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-125</b></i><br /></font>

D_100 - in register units for M3R4-125

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 15 13 13 11 14 13 12 12 12 12 14 13 12 15 14
FEB-2 13 13 15 15 14 13 13 13 13 14 15 13 13 14 16 14
FEB-3 14 14 13 14 14 13 14 13 15 13 15 14 15 15 15 16
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-125</b></i></font>

Noise counts vs Thresholds. M3R4-125


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. M3R4-125</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-125

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