This scaler is packaged in a double width NIM module and contains two identical eight digit counters. Visual readout is provided on two eight digit LED displays. Character height is .25 inches and loading zero suppression is incorporated thus providing a very readable display. A Gate light and Overflow light are provided for each channel. Testing features are provided that test the display (display all B's) and also to test the counters. This is accomplished by manually switching on a test oscillator which injects a test signal, into each channel. When the test oscillator is switched off the two channels should track within +/-1 count verifying correct operation. This test input is inserted after the counting gate so that the module may be tested in the presence of external inputs simply by gating off the scaler. A three position gate switch is provided to "Enable",: "Disable", or allow the channel to be remotely gated by an external Gate signal. Reset is accomplished either manually or externally. A carry output signal is provided for each channel.

    SPECIFICATIONS (IDENTICAL FOR EACH CHANNEL)

 INPUTS-.

  Signal
    Impedance     50 ohms +/-10%, D.C. coupled
    .Pulse Repetition Rate  0 100MHZ min., 150MHZ Typical
    Pulse Pair Resolution  Less than 10nsec.
    Sensitivity    -500mv
    Pulse Width    3nsec. min.

  Gate (Bridged high impedance NIM input)
    Impedance     5K ohms min.
    Sensitivity    -500mv
    Response Time    Less than 10ns

  Reset (Bridged TTL input, biased to Logic "O", +2.5v min.),

    Logic "1"     .5v max. for reset

 OUTPUTS:

  Carry out (note carry out is inhibited during reset)
    Amplitude     -700mv min, into 50 ohms
    Pulse Width    500nsec. typical

 DISPLAYS:
    Data      Displayed on 8 (eight) .25 inch
          LED displays with leading zero
          suppression.

    Gate
          An LED is provided to indicate when the counting gate is open.


    Overflow     An LED is provided to indicate
           when that channel has overflowed.

 MANUAL CONTROLS:
    Gate      A three position switch is
           provided to open (Enable), close
           (Disable), or allow gating from
           an external input (Remote).

    Reset      A pushbutton is provided to reset
           each channel. This switch is
           also used to test the display.
           When the button is depressed all
           8's will appear on the display.

    Test      A Test switch is provided that
           injects test signals into each
           channel, after the counting gate,
           Both channels should track during
           test within +/-1 count.

 SIZE-.      #2 NIM Module

 TEMPERATURE RANGE  0 ' C to 60 ' C

 POWER REQUIREMENTS: +6v, 120ma reset; 600ma both displays all 8's.
        -6v, 535ma.
        +12v, 300ma.

 PRICE:      $950.00

 OPTIONS:

 #1 200MHZ counting capability

 #2 Internal power supply to eliminate the use of +6v operates from
  110v or 220V A.C.