-
High channel density
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Individually programmable thresholds
-
Selectable Updating/Non Updating mode
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Programmable Output width
-
TEST and VETO inputs
-
OR and Current Sum outputs
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4 digit led display
The CAEN Mod. N841 is an 16 Channel Leading Edge Discriminator housed in one unit wide NIM module. The module accepts 16 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 5 ns to 40 ns. Each channel can work both in Updating and Non-Updating mode according to on-board jumpers position. 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 -5 mV. The back panel houses VETO and TEST inputs, the OR output 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 Ω 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 |
|
Threshold range |
-1 mV to -255 mV (1 mV step) |
|
Inputs Channels |
16 inputs, negative polarity, DC coupling |
|
Input Impedance |
50 Ω |
|
Reflections |
<4% for input pulses with a 2 ns rise time |
|
Interchannel isolation |
>44 dB |
|
Max Input voltage |
-5 V |
|
Min. detectable signal |
-5 mV |
|
Max input frequency |
110 MHz (Updating mode), 80 MHz (Non Updating mode) |
|
Double Pulse Resolution |
7 ns (Updating mode); 12 ns (Non Updating mode) |
|
Test Input |
|
|
Veto Input |
|
|
Output Channels |
32 NIM (Fan-Out of 2) + 16 / NIM (single), 50 Ω Impedance |
|
Output Width |
Out: 5 + 40 ns /Out: 6 + 41 ns |
|
Output Rise/Fall Time |
Out: < 1.2 ns; /Out: < 2.5 ns |
|
Input/output delay |
9 ns |
|
Test Input/output delay |
11 ns |
|
Or Output |
NIM signal; 50 Ω impedance |
|
Σ Output |
-1 mA ± 20% per hit; high impedance |
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