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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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17
3.5. Dead Time Ch. 0 to 7
(Base a %44 write only)
This register is used to select the Dead Time value common to all channels from 0 to 7. This
command allows to select on 8 bit (set values: 0 to 255) the Dead Time value between 150 ns
and 2
μ
s. The set value corresponds to the pulse width as follows: 255 leads to a 2
μ
s value, 0
leads to a 150 ns value.
N.B.: The actual Dead Time is equal to the greater between output width and Dead Time
set values
3.6. Dead Time Ch. 8 to 15
(Base a %46 write only)
This register is used to select the Dead Time value common to all Channels from 8 to 15. This
command allows to select on 8 bit (set values: 0 to 255) the Dead Time value between 150 ns
and 2
μ
s. The set value corresponds to the pulse width as follows: 255 leads to a 2
μ
s value, 0
leads to a 150 ns value.
N.B.: the actual Dead Time is equal to the greater between output width and Dead Time
set values.
3.7. Majority
threshold
(Base a %48 write only)
This register allows to set the Majority threshold between 1 and 16 for Internal Majority and
between 1 and 20 for External Majority by writing a proper value in the Base a %48
(set values: 1 to 244).
The relation to use is the following:
MAJTHR = NINT[(MAJLEV*50
−
25)/4]
where NINT is the nearest integer function (allowed values for MAJLEV: 1 to 20) e.g.., if the
User wants to use a majority level of 5, the correct MAJTHR value to use is 56.
3.8. Test
pulse
(Base a %4C write only)
A test pulse on all output channels can be generated by performing a write access at Base
a %4C; the test pulse is generated independently from the number written into this
register.
3.9. Module
identifier
words
(Base a %FA, + %FC, + %FE, read only)
