<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
102 81 469041 13 76 536620 13 80 487631 12 13-JUN-07
<font color="DarkRed" size="5"><i><b>Thr_Max in register units for M3R4-102</b></i><br /></font>

Thr_Max in register units for M3R4-102

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 85 74 86 85 85 78 89 72 78 79 82 77 81 83 76 79
FEB-2 75 85 77 76 73 75 74 85 73 76 74 84 62 83 69 74
FEB-3 73 79 83 88 80 79 73 82 75 83 68 85 75 88 79 86
<font color="DarkRed" size="5"><i><b>Noise rate at Thr_Max [counts/sec] for M3R4-102</b></i><br /></font>

Noise rate at Thr_Max [counts/sec] for M3R4-102

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 440181 575616 358225 585902 405575 484392 456588 444104 382013 545103 344671 416782 311369 594982 466795 692360
FEB-2 588624 591694 694740 486901 418715 483048 389272 330385 348505 708524 902930 414274 386144 473459 632614 736098
FEB-3 593288 501990 514831 519801 372452 525597 440864 288618 404881 278738 440848 502083 489927 604133 630575 693475
<font color="DarkRed" size="5"><i><b><FONT FACE="Symbol">D_100 </FONT> - in register units for M3R4-102</b></i><br /></font>

D_100 - in register units for M3R4-102

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 15 12 15 12 14 12 14 12 14 12 14 12 13 13 14
FEB-2 14 14 14 14 13 13 11 13 10 12 12 14 13 12 13 14
FEB-3 13 13 12 11 12 10 12 10 12 10 12 11 12 11 14 11
<font color="DarkRed" size="5"><i><b>Noise counts vs Thresholds. M3R4-102</b></i></font>

Noise counts vs Thresholds. M3R4-102


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. M3R4-102</b></i></font>

PLOTS of Thresholds Scan Results. M3R4-102

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