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Title:
User's Manual (MUT)
Mod. V895 16 Channel Leading Edge Discriminator
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.
The Majority logic can be switched from an "Internal" to an "External" position by means
of an internal Jumper (see Fig. 2.3).
•
Internal
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
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.
NPO:
00101/97:V895x.MUTx/03
MAJLEV
MAJTHR
1
6
2
19
3
31
4
44
5
56
6
69
7
81
8
94
9
106
10
119
Table 4.1: Majority Level setting values
: With the jumper on the "Internal" position Majority output provides an
: Several modules can be connected in daisy chain via the Σ outputs.
Filename:
v895_rev3.doc
Revision date:
19/03/09
MAJLEV
MAJTHR
11
131
12
144
13
156
14
169
15
181
16
194
17
206
18
219
19
231
20
244
Number of pages:
25
Revision:
3
Page:
24
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