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User's Manual (MUT)
Mod. V812 16 Channel Constant Fraction Discriminator
20/04/2009
4
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00101/97:V812x.MUTx/04 V812_REV4.DOC
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4.11. 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 § 3.7); 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 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 or is equal to the programmed MAJLEV. (An example with
three chained modules is shown in Fig. 4.2). 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
