-
Individually programmable thresholds
-
Programmable output width
-
TEST and VETO inputs
-
OR and Current Sum outputs
-
High sensitivity on small signals
-
4-digit Led display
The CAEN Mod. N844 is an 8 Channel Low Threshold (leading edge type) Discriminator housed in a one unit wide NIM module. The module accepts 8 negative inputs and produces 2×8 NIM outputs (NIM outputs are provided with a fan-out of two) +8 /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; a positive input version (Model N844P), with the thresholds settable in the 1 mV to 255 mV range, is also available. 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 Ω load) ±20%.
You also may be interested in…
NIM8301
NIM8302
NIM8305
NV8020A
NIM8302P
NIM8303
NIM8306
NIM8304
Request a Quote
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 |
|
Input Channels |
8 inputs, negative polarity (positive on N844 P), 50 ohm impedance, DC coupling |
|
Max. input voltage |
-400 mV (+400 mV on N844 P) |
|
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 (1 mV to 255 mV on N844 P) |
|
Output channels |
16 NIM (bridged) + 8 /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 signals, high impedance: |
|
Control outputs |
OR: standard NIM signal, 50 Ohm impedance; logic OR of outputs. Current proportional to input multiplicity (-1 mA  20% per hit), high impedance |
|
Display |
INPUTS: 16 [8] red LEDs; they light up when the channel is being programmed or when it is inhibited |
Footer
