LINEAR AMPLIFIER - [ Type : LA 520 ]
Technical Data

Linear Amplifer LA 520 is a solid state pulse amplifier designed to shape and faithfully amplifies detector pre-amplifier output pulses to operable levels. Many of the Nuclear Detectors give small amplitude pulse outputs. These output pulses cannot be directly counted or analysed by scalers, countrate meters and single channel analyser, without being first amplifed. Featuring excellent non-overload characteristics, a high gain, low equivalent input noise and flexibility of pulse shaping, LA 520 is ideally suited for use with Nuclear Counting Systems such as Gammaray Spectrometers and other similar units.

This unit features compact modular construction and its power requirements are met by Instrumentation bin and power supplies including minibin and power supply MB403 of Nucleonix make or its equivalent.


  • Solid state design
  • Input : Accepts both positive or negative input
  • Typical gain : 600 +/-10%
  • Adj. pulse shaping from 0.1 to 5 micro seconds
  • Output : 0 to 8 volts positive
  • Two bit module
Input Polarity
Positive or Negative
Input Impedance
93 ohms
Total Gain
Typical 800 +/-10% with 1 micro second time constant
Gain Adjustment
a. Input attenuator : Attenuator factors x2.5 & x 1
b. Coarse gain : 0.2, 0.5, 1,2,3,5 & 8 by rotary switch
c. Fine gain : About adjustable by a ten turn helipot and knob/ precision dial.
Pulse shaping
Differentiating and integration RC time constants variable from 0.1 micro second to 5 micro second in sequence of 0.5, 1, 2, 3, 6, 10 with a provision of switching integration IN/OUT
Amplifier Rise Time
Better than 100 nano seconds with no integration and 0.1 micro second differentiation constant
0 to 8V positive, 12V maximum unipolar
Output Impedance
Approximately 93 ohms
Amplifier noise
Equivalent input noise 10 micro volts rms typical at maximum gain and 1 microsecond integration and differentiation
The integral non-linearity is less than 0.15% from 200 mV to 8 mV at 1 micro sec time constant, integration IN.
Power Requirement
+24V at 45mA
-24V at 40mA
+12V at 20mA
-12V at 5mA
Standard two width module
Temperature Stability
0.01% per degree centigrade
Module connector
Amphenol connector type 26-159-24P-H (24 pin type) or NIM standard, as per AEC specifications TID 20893 (Rev) Type AMP 204186-5