<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
47 80 470410 13 80 486410 13 78 617638 14 07-FEB-07
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-47</b></i><br /></font>

Thr_Max in register units for M3R4-47

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 84 81 80 88 75 84 77 82 84 78 75 85 71 78 79
FEB-2 73 84 82 81 85 76 78 84 85 73 77 73 83 78 79 81
FEB-3 74 84 74 83 73 81 75 81 79 79 75 81 73 82 78 72
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-47</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-47

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 432168 569191 404248 511513 342529 415950 337656 522171 280232 339716 519722 398808 483358 647902 591516 729881
FEB-2 602141 612575 455078 437381 391548 381880 471285 347125 519156 396810 504978 443987 501235 541367 591369 584646
FEB-3 653819 702596 566802 663232 496776 472508 460421 529608 709259 570704 559756 613154 689023 651842 827190 715513
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-47</b></i><br /></font>

D_100 - in register units for M3R4-47

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 13 14 13 13 14 13 12 12 12 13 14 13 14 13
FEB-2 13 14 13 13 12 12 13 12 13 11 12 13 12 14 13 12
FEB-3 14 15 13 15 13 13 12 15 14 14 13 15 14 13 16 15
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-47</b></i></font>

Noise counts vs Thresholds. M3R4-47


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. M3R4-47</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-47

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