<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
96 76 526181 13 73 436072 12 80 452431 12 16-MAR-07
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-96</b></i><br /></font>

Thr_Max in register units for M3R4-96

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 75 74 70 77 67 78 75 78 79 78 76 75 74 87 77
FEB-2 76 70 74 77 69 74 74 75 72 73 73 73 73 74 76 68
FEB-3 79 80 85 80 78 78 87 73 90 74 89 76 81 69 80 78
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-96</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-96

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 528096 571512 504378 353258 467914 405071 592298 536783 475749 349361 612100 503812 632504 372413 855551 658089
FEB-2 512425 619990 397985 393794 230384 416252 396618 329265 230297 362151 429302 334770 566518 478491 517300 761603
FEB-3 407806 518715 348229 490943 364482 485747 381958 393058 478071 377460 462273 419345 444317 459093 595708 611686
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-96</b></i><br /></font>

D_100 - in register units for M3R4-96

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 12 14 12 13 12 14 12 15 13 12 12 15 14
FEB-2 10 12 11 13 10 12 11 11 10 12 11 11 12 13 13 12
FEB-3 12 13 11 12 12 12 12 11 12 12 11 13 13 14 13 13
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-96</b></i></font>

Noise counts vs Thresholds. M3R4-96


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. M3R4-96</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-96

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