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NIM Discriminator Comparison Matrix

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Model # Chan. Type Threshold (mV) Output Width (nSec) In / Out Delay (nSec) # Of Outputs
Pos / Neg		 Veto Max Rate (MHz) Summing Output Remote Control Burst Guard Hi Z Bridged Input
EG&G: 934 4 Constant Fraction -30 to -1000 <6 to >150 13 0 / 3 No 100 No Yes
(Bin Gate)
EG&G: T105/N
EG&G: T140/N 4 Zero Crossing -200 < 5 to > 10 8 0 / 1 No 250 No Yes
(Bin Gate)		 No No
EG&G: TR204A/N 2 Updating
ELSCINT: STD-N-1 Constant Fraction
LRS: 121N
LRS: 161 2 Updating 150
LRS: 161L 2 Updating 150
LRS: 321 4
LRS: 321B 4 Updating -100 to -800 5 to > 800 9 1 / 2 No 100 No Yes
(Bin Gate)		 No No
LRS: 321BL 4 Updating -100 to -800 5 to > 800 9 1 / 2 No 100 No Yes
(Bin Gate)		 No No
LRS: 321C 4
LRS: 420L 8
LRS: 4608C 8 150
Model # Chan. Type Threshold (mV) Output Width (nSec) In / Out Delay (nSec) # Outputs
Pos / Neg		 Veto Max Rate (MHz) Summing Output Remote Control Burst Guard Hi Z Bridged Input
LRS: 620 8 100
LRS: 620AL 8 Non-Updating -30 to -1000 5 to > 20 7.5 0 / 3 No >100 No Yes
(Bin Gate)		 No No
LRS: 620B 8 Non-Updating 100
LRS: 620BL 8 Non-Updating -30 to -1000 5 to 22 7.5 0 / 3 No >100 Yes Yes (Bin Gate) No No
LRS: 620BLP 8 Non-Updating -30 to -1000 5 to 22 7.5 0 / 3 No >100 Yes Yes
(Bin Gate)
(Thresh)		 No No
LRS: 620CL 8 Yes 100
LRS: 620D 8 Non-Updating -30 to -1000 5 to 20 7.5 0 / 3 Yes >100 Yes Yes
(Bin Gate)		 No No
LRS: 620L 8 Non-Updating -30 to -1000 5 to 20 7.5 0 / 3 No >100 No Yes
(Bin Gate)		 No No
LRS: 621AL 4 Updating -30 to -1000 5 to 1000 9.5 1 / 5 No >110 No Yes
(Bin Gate)		 No No
LRS: 621BL 4 Updating -30 to -1000 5 to 1000 9.5 1 / 5 No 110 No Yes
(Bin Gate)
(Thresh)		 Yes Yes (1)
LRS: 621BLP 4 Updating -30 to -1000 5 to 1000 9.5 1 / 5 No 110 No Yes
(Bin Gate)
(Thresh)		 Yes Yes (1)
LRS: 621L 4 Updating -30 to -1000 5 to 1000 9 1 / 5 No 120 No Yes
(Bin Gate)		 No
LRS: 623 8 Updating -30 to -1000 6 to 150 11 0 / 3 No >100 No Yes
(Bin Gate)		 No
LRS: 623B 8 Updating -30 to -1000 6 to 150 11 0 / 3 No >100 No Yes
(Bin Gate)		 No Yes (1)
LRS: 821 4 Updating -30 to -1000 5 to 1000 11.0 1 / 5 Yes 100 No No Yes Yes (1)
Model # Chan. Type Threshold (mV) Output Width (nSec) In / Out Delay (nSec) # Outputs
Pos / Neg		 Veto Max Rate (MHz) Summing Output Remote Control Burst Guard Hi Z Bridged Input
MECHTRONICS: 605 2
ORTEC: 473A Constant Fraction
ORTEC: 934 Constant Fraction
ORTEC: T105/N 2
ORTEC: T108/N 8
ORTEC: T120/N 4 Updating
ORTEC: T121/NL 4 Updating
ORTEC: T140/N 4 Zero Crossing -200 <5 to >10 8 0 / 1 250 Yes
(Bin Gate)
ORTEC: T200/N 1 Fast Trigger -100 to -250 3 or 5 0 / 2 225 Yes
(Bin Gate)
ORTEC: T204A/N 2 Updating
ORTEC: TD101/N Differential
ORTEC: TR204A/N 2 Updating
Model # Chan. Type Threshold (mV) Output Width (nSec) In / Out Delay (nSec) # Outputs
Pos / Neg		 Veto Max. Rate (MHz) Summing Output Remote Control Burst Guard HI Z Bridged Input
PHILLIPS: 710 8 Updating -30 to -1000 4 to 150 < 8 1 / 3 Yes 150 Yes
PHILLIPS: 710D 8 Updating -10 to -1000 4 to 150 < 8 1 / 3 Yes 150 Yes
PHILLIPS: 711 6 Updating -10 to -1000 4 to 1000 < 8 1 / 2 Yes 150 Yes Yes
PHILLIPS: 715 5 Constant Fraction -25 to -1000 5 to 150 < 10 1 / 3 Yes 100 No

NOTES
 
(1) High Impedance bridge inputs are available at the expense of one normal output.
 
(2) 100 nSec output duration is possible with a restriction that the input and output widths can not be equal.
 
Constant Fraction - Permits optimum timing measurements to be made with photomultiplier tubes or fast solid-state detectors. Each input signal is split so that a portion of the signal is delayed and subtracted from a fraction of the undelayed signal. The resulting bipolar constant fraction signal has a baseline crossover that is virtually independent of the input signal amplitude. The zero crossing point is detected and used to provide precisely timed logic pulses for a wide dynamic range of input signals.
 
Updating - The unit may be retriggered during the time an output from a previous input signal is being produced.
 
Non-Updating - The output must return to a zero, or "off", state before retriggering can occur.
 
Differential - Produces an output pulse from only those inputs which fall within a amplitude window.
 
Zero Crossing - Produces an output pulse after the input surpasses the input trigger level, typically -200mV, and then crosses thru 0V to a positive level.
 
Fast Trigger - Produces a fast trigger output, typically 3 or 5nSec in width, for each input signal that exceeds the threshold level.
 
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Information maintained by Mike Behnke; last modified on July 11, 2006.
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