<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
190 70 275277 10 81 375618 11 74 486130 13 19-JAN-07 Sens=7.5mV/fc Th=15fc
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-190</b></i><br /></font>

Thr_Max in register units for M3R4-190

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 71 77 69 74 75 81 73 72 66 72 64 70 62 68 59 68
FEB-2 81 92 84 75 81 79 73 87 84 83 82 78 79 83 79 74
FEB-3 73 63 78 70 74 68 71 76 71 76 74 75 73 79 85 70
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-190</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-190

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 233493 637593 206128 257598 161380 214269 215870 297272 141114 206852 265416 351198 206262 445111 246855 318022
FEB-2 392967 543772 214341 586392 363018 373172 252319 519351 217036 397642 220883 321990 287836 394045 425096 500029
FEB-3 529605 557879 492859 476449 489211 391292 433778 373385 408116 401428 386534 626290 508098 492995 644393 565771
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-190</b></i><br /></font>

D_100 - in register units for M3R4-190

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 10 13 10 11 10 10 10 10 9 10 9 12 10 12 10 11
FEB-2 11 13 9 12 10 13 10 12 9 13 10 12 11 12 11 13
FEB-3 12 14 12 13 13 13 13 13 13 13 13 14 12 14 13 14
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-190</b></i></font>

Noise counts vs Thresholds. M3R4-190


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. M3R4-190</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-190

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