<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
89 76 459749 13 83 554131 12 82 769218 13 18-MAR-07
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-89</b></i><br /></font>

Thr_Max in register units for M3R4-89

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 79 78 79 74 72 76 65 75 78 78 73 84 75 78 78 74
FEB-2 80 80 81 78 82 89 81 84 79 84 75 87 80 92 86 86
FEB-3 88 82 90 81 90 85 91 77 89 75 77 76 84 80 79 73
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-89</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-89

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 439832 677851 620689 284398 492845 498315 349568 276258 447707 389091 429720 306276 430307 528460 583290 601372
FEB-2 579567 590503 520205 458960 550011 432590 441442 553505 513491 443232 480530 397574 696516 655187 660358 892423
FEB-3 1243585 622451 899350 416795 793694 487486 888565 278949 913689 455320 1235715 760160 819815 886642 1113245 492028
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-89</b></i><br /></font>

D_100 - in register units for M3R4-89

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 12 14 11 12 12 12 11 13 13 13 12 13 14 15 13
FEB-2 11 15 13 12 11 12 12 13 12 13 11 12 14 12 13 13
FEB-3 15 15 14 12 13 13 12 10 13 10 13 13 13 14 15 12
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-89</b></i></font>

Noise counts vs Thresholds. M3R4-89


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. M3R4-89</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-89

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