V814
16 Channel Low Threshold Discriminator
Features
- Thresholds individually programmable via VME
- ECL outputs with fan-out of two
- Non updating operation
- Programmable output width
- Mask register for individual channel enable/disable
- Global VETO and TEST inputs
- OR, CURRENT SUM and MAJORITY outputs
- High sensitivity with small signals
- Negative or Positive input version available
- Libraries (C and LabView) and Software tools for Windows and Linux
Overview
The CAEN Mod. V814 is a 1-unit wide VME module housing a 16 channel low threshold discriminator. The module accepts 16 negative (positive on request) inputs and produces 16 differential ECL outputs with a fan-out of two on four front panel flat cable connectors. Maximum input frequency is 60 MHz. The pulse forming stage of the discriminator produces an output pulse whose width is adjustable in a range from 6 to 95 ns via VME. The discriminator thresholds are individually settable in a range from -1 mV to -255 mV (1 mV step), via VME through an 8-bit DAC; a positive input version (Model V814PB), with the thresholds settable in the 1 mV to 255 mV range, is also available. Each channel can be turned on or off via VME by using a mask register. A Current Sum output 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).
A MAJORITY output connector provides a NIM signal if the number of input channels over threshold exceeds the MAJORITY programmed value. Several V814 boards can be connected in a daisy chain via the Current Sum output: in this case, by switching the majority logic to External, it is possible to obtain a Majority signal when the number of active channels in the chained modules exceeds a global Majority level. The logic OR of discriminator outputs is available on a front panel NIM signal.
Technical Specifications
- Packaging
6U-high, 1U-wide VME unit
The Mod. V814/V814 P is provided with P1, P2 and PAUX connectors.
The Mod. V814 B/V814 PB is provided with P1, P2 connectors (NO PAUX).
- Inputs
16 inputs (negative polarity, 50 Ω impedance, DC coupling)
- Input voltage range
V814/V814B: -1 mV to -400 mV; V814 P/PB: 1 mV to 400 mV
- Max input frequency
60 MHz (8 ns output pulse width)
- Double Pulse Resolution
16 ns (8 ns output pulse width)
- Threshold range
V814/V814B: -1 ÷ -255 mV; V814 P/PB: 1 ÷ 255 mV (1 mV step)
- Outputs
16 outputs with a fan-out of two (ECL, 110 Ω impedance)
- Output width
Programmable from 6±1 ns to 95±7 ns
- Input/output delay
10.5±1.5 ns
- Interchannel Insulation
54 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
- 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
- Display
DTACK: green LED; lights up at each VME access
OR: green LED; it lights up if at least one output signal is present
- Power requirements
Power Supply V814B/V814P V814B/V814 PB (no PAUX) + 12 V 100 mA 100 mA – 12 V 50 mA 50 mA + 5 V 800 mA 5.1 A – 5 V 3.3 A –
Compare
Compare with Discriminators.
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Accessories
- A954
- Cable assembly 2.54mm 34 pin female to two 2.54mm 16 pin female - 50 cm
Ordering Options
Code | Description |
---|---|
WV814XBAAAAA | V814B - 16 Channel Low Threshold Discriminator (NoJAUX) RoHS |
WV814XPBAAAA | V814PB - 16 Channel Low Threshold Discriminator Positive Inputs No JAUX RoHS |