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Individually programmable thresholds
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Programmable output width
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TEST and VETO inputs
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OR and Current Sum outputs
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High sensitivity on small signals
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4-digit Led display
The CAEN Mod. N845 is an 16 Channel Low Threshold (leading edge type) Discriminator housed in a one unit wide NIM module. The module accepts 8 negative inputs and produces 2×16 NIM outputs (NIM outputs are provided with a fan-out of two)+ 16 /NIM outputs (negated) on front panel LEMO 00 connectors.
The pulse forming stage of the discriminator produces an output pulse whose width is adjustable in a range from 6 to 95 ns. The discriminator thresholds are individually settable in a range from -1 mV to -255 mV (1 mV step), via an 8-bit DAC. The minimum detectable signal is -3 mV. The back panel houses VETO and TEST inputs, the logical OR output (the relevant OR LED lights up if at least one channel is over threshold) and the Current Sum output, which generates a current proportional to the input multiplicity, i. e. to the number of channels over threshold, at a rate of -1.0 mA per hit (-50 mV per hit into a 50 Ohm load) ±20%.
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Compare
|
Image
|
Name
|
Package
|
No. of Channels
|
Function
|
Updating
|
Min Input (mV)
|
Output Width (ns)
|
I/O Delay (ns)
|
Outputs
|
Input Bandwidth (MHz)
|
In Conn.
|
Out Conn.
|
|
|
N840 |
NIM |
null |
Leading Edge |
Selectable |
-5 |
5 ÷ 40 |
10 |
2 + /1 NIM |
140 |
LEMO |
LEMO |
|
|
N843 |
NIM |
null |
Const. Fraction |
No |
-5 |
15 ÷ 245 |
n/a |
2 + /1 NIM |
n/a |
LEMO |
LEMO |
|
|
N842 |
NIM |
null |
Const. Fraction |
No |
-5 |
15 ÷ 245 |
n/a |
2 + /1 NIM |
n/a |
LEMO |
LEMO |
|
|
N844 |
NIM |
null |
Low Threshold |
No |
-3 |
5 ÷ 90 |
10 |
2 + /1 NIM |
60 |
LEMO |
LEMO |
|
|
V812 |
VME |
null |
Const. Fraction |
No |
-5 |
12 ÷ 206 |
n/a |
2 ECL |
n/a |
LEMO |
Std. Flat |
|
|
N845 |
NIM |
null |
Low Threshold |
No |
-3 |
5 ÷ 90 |
10 |
2 + /1 NIM |
60 |
LEMO |
LEMO |
|
|
V895 |
VME |
null |
Leading Edge |
Selectable |
-5 |
5 ÷ 40 |
10 |
2 ECL |
140 |
LEMO |
Std. Flat |
|
|
N605 |
NIM |
null |
Const. Fraction |
Selectable |
-20 |
2 ÷ 500 |
n/a |
3 NIM |
250 |
LEMO |
LEMO |
|
|
N841 |
NIM |
null |
Leading Edge |
Selectable |
-5 |
5 ÷ 40 |
10 |
2 + /1 NIM |
140 |
LEMO |
LEMO |
|
|
V814 |
VME |
null |
Low Threshold |
No |
-1 |
6 ÷ 95 |
10 |
2 ECL |
60 |
LEMO |
Std. Flat |
Technical Specifications
|
Packaging |
1U-wide NIM unit |
|
Inputs |
16 inputs (negative polarity, 50 Ohm impedance, DC coupling) |
|
Max input voltage |
-400 mV |
|
Min. detectable signal |
-3 mV |
|
Max input frequency |
60 MHz (8 ns output pulse width) |
|
Double pulse resolution |
16 ns (8 ns output pulse width) |
|
Threshold range |
-1 mV to -255 mV (-1 mV step) |
|
Outputs channels |
32 NIM (bridged) + 16 /NIM (single) (50 Ohm) |
|
Input/output delay |
10.5±1.5 ns |
|
Output width |
Programmable from 6 ns to 106 ns |
|
Output rise/fall time |
OUT: 1.2 ns; /OUT: 2.5 ns |
|
Interchannel insulation |
45 dB for 2.5 ns rise time input signals |
|
Control inputs |
NIM logic signals, high impedance:
|
|
Control outputs |
OR: standard NIM signal; Current Sum: current proportional to input multiplicity (-1 mA ± 20% per hit) |
|
Display |
INPUTS: 16 [8] red LEDs; they light up when the channel is being programmed or when it is inhibited |
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