N845
16 Channel Low Threshold Discriminator
Features
- Individually programmable thresholds
- Programmable output width
- TEST and VETO inputs
- OR and Current Sum outputs
- High sensitivity on small signals
- 4-digit Led display
Overview
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%.
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:
- VETO: allows vetoing of all channels simultaneously
- TEST: triggers all the enabled channels at once
- 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
4-DIGIT DISPLAY: it indicates the channels’ status and programmed parameters’ values
OR: green LED; it lights up if at least one output signal is present
Compare
Compare with Discriminators.
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Accessories
- A385
- Adapter 2.54mm 34-pin female to 16x LEMO 00 female (or MCX male) – 50 cm / 1 m
Ordering Options
| Code | Description |
|---|---|
| WN845XAAAAAA | N845 - 16 Channel Low Threshold Discriminator 50 Ohm Negative Inputs RoHS |
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