INPUT CHARACTERISTICS



      General:

           One LEMO connector input per channel; 50

           ohms +/-1%, direct coupled; less than 2% input

           reflection for a 2.0 NSEC input risetime.  Input

           protection clamps at +.7V and -5V and can

           withstand transients of +/-2 amps (+/-1OO Volts) for

           1 USEC with no damage to the input.







     Threshold:

           Variable from -10 mV to -1 Volt; 15 turn screw-

           driver adjustment; better than +/-0.20%/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 six (6)

           channels; accepts normal NIM level pulse

           (-500 mV), 50 ohms impedance direct coupled;

           must precede the negative edge of input pulse

           by 5 NSEC to veto; 4 NSEC minimum input width.





     Bin Gate:

           Rear panel slide switch enables or disables bin

           slow gate in accordance with TID-20893.

           Responds in approximately 10 NSEC to Bin Gate

           signal.







OUTPUT CHARACTERISTICS



      General:

           Five (5) LEMO connector outputs per channel;

           Two pairs of negative bridged outputs and one

           complementary output.  The bridged pairs deliver

           a double-amplitude pulse of -32 mA (-1.6 Volts

           into a single 50 ohm load, or -800 mV when both

           outputs are 50 ohm terminated).  The

           complementary output is quiescently -16 mA

           (-800 mV into 50 ohms) and delivers 0 mA

           (O Volts into 50 ohms) during output.  Output

           risetimes and falltimes are less than 1.5 NSEC from

           10% to 90% levels.  The output pulse shapes are

           optimized when the bridged outputs are 50

           ohm terminated.

      Output Duration:

           A two position front panel locking toggle switch

           allows either updating operation or burst guard

           operation common for all six (6) channels.

           Updating: The output width is controlled by a

           front panel 15 turn screwdriver adjustment,

           continuously variable from 4 NSEC to 1 uSEC.

           Burst Guard: The output duration equals either

           the input signals time-overthreshold (TOT), or

           the preset duration of 4 NSEC to 1 uSEC, which-

           ever is greater.  For input bursts of 150 MHz or

           greater, the output will equal the duration of the

           burst, should it be greater than the preset

           duration.  Output width stability is +/-.15%/degC

           of setting.

      Summed Output:

           One LEMO connector output common to all

           eight (8) channels; -1 mA output pulse (-50 mV

           into 50 ohms) for each channel fired.  Output

           duration is equal to the output width setting of

           the respective channel.  Output risetimes and

           falltimes are less than 2.5 NSEC into 50 ohms.  Up

           to 18 channels can be directly "OR'D" by cable.

           -1 Volt of dynamic range.







GENERAL PERFORMANCE







 Rate:

     150 MHz minimum, input to output.  Typically 160 MHz.

 Double-Pulse  Resolutions

     Less than 6.5 NSEC; typically 6 NSEC with output width set at minimum

 Input to Output Delay.:

     Less than 8 NSEC.

 Multiple Pulsing:

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

 Power Supply Requirements:

     - 6 V @    15 mA         + 6V@35OmA

     -12V@165mA             +12V@  OmA

     -24 V @ 80  mA         +24 V @ 35 mA

              115 VAC @ 65 mA

     Note: All currents within NIM specification limits allowing a full-power bin to

            be opperated without    overloading.

 Operating Temperature:

     OdegC to 70degC ambient.

 Packaging:

     Standard single width NIM module in accordance with TID-20893 and Section 524.

 Options:

     Contact Phillips Scientific to find out about available options.