Document type:
Title:
Revision date:
Revision:
User's Manual (MUT)
Mod. V812 16 Channel Constant Fraction Discriminator
20/04/2009
4
NPO:
Filename:
Number of pages:
Page:
00101/97:V812x.MUTx/04 V812_REV4.DOC
23
8
1.3. Technical specification table
Table 1.2: Technical specification table
Packaging
6U-high, 1U-wide VME unit
Power requirements
Refer to § 2.2
Inputs
16 inputs (negative polarity, 50
Ω
impedance)
Max input voltage
-5 V
Min detectable signal
-5 mV
Threshold range
-1 mV to -255 mV (1 mV step)
Constant fraction
20%
Delay
Selectable in 4 ns steps (20 ns full scale)
Optional:
5ns full scale with 1ns steps
50ns full scale with 10ns steps
100ns full scale with 20ns steps
Outputs
16 outputs with a fan-out of two (ECL, 110
Ω
impedance)
Input/output delay
Set delay+4.5
±
2 ns
Output width
Programmable from 15 ns to 250 ns
Dead Time
Programmable from 150 ns to 2
μ
s (
±
10%)
Max outputs time walk
±
400 ps for input signals in the range from -50 mV to - 5 V with 25 ns
rise time
Autowalk
Automatic adjustment of input offset and low frequency input noise of
±
40 mV
Control inputs
NIM logic signals, high impedance:
VETO:
allows to veto all channels simultaneously
TEST:
triggers all the enabled channels at once
Control outputs
MAJORITY:
standard NIM logic signal, 50
Ω
impedance; it
indicates if the number of input channels over threshold exceeds
the MAJORITY level programmed via VME
OR:
standard NIM signal, 50
Ω
impedance; logic OR of outputs
Σ
:
current proportional to input multiplicity (-1 mA
±
20% per hit),
high impedance
Displays
DTACK:
green LED; lights up at each VME access
OR:
green LED; it lights up if at least one output signal is present
