<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
75 82 461328 12 78 492501 13 74 445621 12 05-JUL-07
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-75</b></i><br /></font>

Thr_Max in register units for M3R4-75

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 77 85 77 87 84 80 80 86 85 75 73 87 83 88 82 77
FEB-2 76 77 76 79 73 80 74 81 74 85 72 86 75 77 81 86
FEB-3 73 74 70 78 73 81 74 65 73 74 73 69 82 75 76 76
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-75</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-75

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 587176 671045 620138 434168 395364 417994 426162 255064 470939 310388 406043 295749 569523 371206 514479 635804
FEB-2 442299 608765 403154 472943 271463 508122 396202 418733 489287 434079 499722 334440 567686 450609 650472 932047
FEB-3 390582 464723 402438 497454 392039 464398 338852 469208 448420 353485 515375 315063 431366 418603 550536 677391
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-75</b></i><br /></font>

D_100 - in register units for M3R4-75

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 13 12 11 13 12 13 11 12 11 14 12 13 14
FEB-2 12 14 13 14 11 12 13 13 12 13 13 12 11 12 15 13
FEB-3 12 13 12 13 11 13 12 12 12 12 13 11 12 12 13 13
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-75</b></i></font>

Noise counts vs Thresholds. M3R4-75


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. M3R4-75</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-75

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