NIM 710

FEATURES

         * 150 MHZ RATE CAPABILITY
         * DEADTIMELESS UPDATING OPERATION
         * FOUR OUTPUTS PER CHANNEL
         * FAST VETO AND BIN GATE INHIBITING
         * LINEAR SUMMED OUTPUT

DESCRIPTION
The model 710 is a high-performance, eight-channel, leading edge  discriminator  packaged  in  a  single-width  NIM module.  It features  independent  threshold  and  width  controls, a fast veto for inhibiting, a prompt  linear  summed  output,  and a versatile output configuration  with  four  updating  outputs per channel.

The 710 has high input sensitivity of -10 mV variable to -1 volt via a 15-turn front panel control.  A front panel  test point on each channel  provides  a  DC  voltage  equal  to  ten times the actual threshold to insure accurate settings.
 

A unique summed output, common to all eight channels, delivers - 1 mA of current for  each  activated  channel,  thus allowing a fast decision to be made on the number of channels simultaneously hit.  Up to 16 channels can be "OR'D" directly by cable to other summed outputs providing a versatile scheme to form a trigger.

Inhibiting of the discriminator can  be  accomplished  in  two ways.  A front panel LEMO input  accepts  a  NIM  level  pulse  for fast simultaneous inhibiting of all eight channels.  Secondly, a slow bin gate via the rear panel  connector  inhibits  the  module and is enabled or disabled from a rear panel slide switch.

Output durations are  continuously  variable  via  a  front panel control over the range of 4nSec to 150nSec.  The updating design permits deadtimeless operation which is desirable for fast coincidence applications at high rates.

The 710 has four high-impedance current switching outputs per channel.  They are configured as one pair of double-amplitude  bridged  outputs,  one  normal  NIM  level  and  one complemented  NIM  level.  When  only  one  output   from   the bridged pair is used, a double-amplitude NIM pulse (- 32 mA) is generated for  driving  long  cables.  Two  normal NIM levels are  produced  when  both  of  the  bridged outputs operate into 50 ohm loads.  The output risetimes and falltimes are typically 1 nSec, and their shapes are  unaffected  by  the loading conditions of the other outputs.

INPUT CHARACTERISTICS
General:
One  LEMO  connector   input   per   channel; 50 ohms, +/-1%,  DC  coupled;  less  than  2% input reflection for a 2.0nSec  input  risetime.  Input protection clamps  at  +0.7V and -5.0V and can  withstand  +/-  2 amps for 1uSec  with  no  damage  to  the  input.

Threshold:
-10 mV to 1 volt; one front panel 15 turn screwdriver adustment for each channel;  better than 0.2%/degC stability; front panel test point provides a DC voltage ten (10) times the  actual  threshold setting.

Fast Veto:
One  LEMO  connector  input  common   to   all eight (8) channels; accepts normal NIM level pulse (-500 mV); the  veto  input  must precede the  negative  edge  of  input  pulse by 5nSec;  4nSec minimum input  width.

Bin Gate:
Rear panel slide switch  enables  or  disables bin slow gate in accordance with TID-20893.

OUTPUT CHARACTERISTICS
General:
Four (4) LEMO connector outputs per channel; one set of negative bridged outputs; one normal NIM level and one complementary output.  The bridged pair deliver  a  double-amplitude  pulse  of -32mA (-1.6 volts into a single 50 ohm load, or -800 mV  when  both  outputs  are  50  ohm  terminated).  The normal NIM output delivers -16mA (- 800mV into 50 ohms).  The complementary output is quiescently -16mA (-800 mV into 50 ohms) and delivers 0mA (0 volts into 50 ohms) during output.  Output  rise-times and falltimes are less than 1.5nSec from 10% to 90% levels.

Width Control:
One front panel control per channel; 15 turn screwdriver adjustment; outputs continuously variable from 4nSec  to  150nSec.  Output  width stability is +/-1.5%/degC of setting.

Updating Operation:
The output pulse will be extended if a new input pulse occurs while the output is active.  This provides  deadtimeless  operation and 100% duty cycle can be achieved.

Summed Output:
One LEMO connector output common to all eight (8) channels; -1mA output  pulse  (- 50mV into 50 ohms) for each channel fired.  Output duration is equal to the output width setting of the respective channel.  Output risetimes  and  fall-times are less than 2.5 nSec into  50  ohms.  Up  to 16 channels can be directly "OR'D"  by  cable.  -1V of dynamic range.
 

GENERAL PERFORMANCE
Continuous Repetition Rate:
Greater than 150MHz, with output width set at minimum.

Pulse-Pair Resolution:
Better than 6.5nSec, with output width set at minimum.

Input to Output Delay:
Less than 8nSec.

Multiple Pulsing:
One and only one output pulse regardless of input pulse amplitude or duration.

Power Supply Requlrements:
-6V @ 420mA     +6V @ 415mA
-12V@165mA    +12V @ 0mA
-24V@80mA    + 24V @ 80mA
115VAC @ 75 mA
NOTE: All currents are wlthin NIM specification limits allowing a full bin to be operated without overloading.

Operating Temperature:
0degC to 70degC ambient.

Packaging:
Standard single width NIM module in accordance with TID-20893 and section ND-524.

Quality Control:
Standard 36-hour, cycled burn-in with switched power cycles.


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