<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
165 76 493353 13 79 511843 13 75 482941 13 06-JUN-07
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-165</b></i><br /></font>

Thr_Max in register units for M3R4-165

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 84 72 77 64 80 65 78 73 82 67 81 75 85 82 84
FEB-2 78 79 67 90 72 81 72 79 73 89 71 88 67 90 76 84
FEB-3 69 86 64 82 76 69 80 78 80 81 71 73 75 77 80 66
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-165</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-165

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 494688 635841 541750 451879 585099 350890 517017 343822 396425 328375 480796 368683 480684 597717 638484 681494
FEB-2 519683 582383 436262 755710 379946 503385 423992 328874 562152 413441 395116 553767 469457 553063 654647 657614
FEB-3 457414 574102 477714 418709 374703 550018 420122 338717 380585 415342 506424 343208 407986 674107 535873 852025
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-165</b></i><br /></font>

D_100 - in register units for M3R4-165

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 15 14 14 13 15 12 15 13 13 12 13 13 13 13 14 13
FEB-2 13 14 12 15 12 11 13 10 13 12 13 13 14 14 15 13
FEB-3 14 15 14 13 12 13 11 12 12 13 14 13 12 14 13 14
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-165</b></i></font>

Noise counts vs Thresholds. M3R4-165


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. M3R4-165</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-165

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