<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
90 86 440889 13 77 421366 12 79 448572 12 16-MAR-07
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-90</b></i><br /></font>

Thr_Max in register units for M3R4-90

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 84 83 82 80 88 86 95 83 88 89 84 88 82 83 93
FEB-2 68 80 70 75 74 90 72 82 70 81 68 84 75 80 73 84
FEB-3 88 73 79 84 80 76 86 82 79 80 81 71 75 74 74 80
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-90</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-90

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 502414 570942 486232 345475 541820 442688 377625 310464 380394 301760 368418 485230 493750 405489 503527 537997
FEB-2 365693 555678 380689 582656 400965 431370 431038 365288 368509 281928 468057 339810 373665 380363 517122 499026
FEB-3 427365 496060 694461 391123 668648 261227 407842 455138 520713 318858 451553 220508 479853 313774 540321 529715
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-90</b></i><br /></font>

D_100 - in register units for M3R4-90

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 13 12 13 13 13 12 12 13 12 13 13 14 13 13 13
FEB-2 12 14 13 11 11 12 10 11 10 11 12 11 12 12 14 12
FEB-3 12 13 13 12 13 11 12 12 11 11 12 10 13 12 13 12
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-90</b></i></font>

Noise counts vs Thresholds. M3R4-90


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. M3R4-90</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-90

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