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User's Manual (MUT)
Mod. V895 16 Channel Leading Edge Discriminator
19/03/09
3
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00101/97:V895x.MUTx/03 v895_rev3.doc
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24
4.7. Majority
setting
Majority output provides a standard NIM signal if the number of channels over threshold
exceeds the programmed majority level (MAJLEV). MAJLEV can be programmed
between 1 and 16, writing a proper value (MAJTHR) in the Majority threshold register
(see § 3.6); valid values range between 0 and 255. MAJTHR can be calculated in the
following way:
MAJTHR = NINT[(MAJLEV*50
−
25)/4]
where NINT is the Nearest Integer.
Table 4.1: Majority Level setting values
The Majority logic can be switched from an "Internal" to an "External" position by means
of an internal Jumper (see Fig. 2.3).
•
Internal
: With the jumper on the "Internal" position Majority output provides an
active signal if the number of the active channels of the module exceeds or is
equal to the programmed majority level (MAJLEV). In this case valid values of
MAJLEV are from 1 to 16
•
External
: Several modules can be connected in daisy chain via the
Σ
outputs.
In this case, by setting the Jumper to the "External" position, the Majority logic
will act on the sum of the
Σ
outputs of the connected modules. The majority
signal will be active if the sum of chained modules active channels exceeds the
programmed MAJLEV. (An example with three chained modules is shown in
Fig. 4.3). The
Σ
output line must be terminated with 50 Ohm.
MAJLEV
MAJTHR
MAJLEV
MAJTHR
1
6
11
131
2
19
12
144
3
31
13
156
4
44
14
169
5
56
15
181
6
69
16
194
7
81
17
206
8
94
18
219
9
106
19
231
10
119
20
244