Linear Amplifer LA 520 is a solid state pulse amplifier designed to shape and faithfully amplifies detector preamplifier 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 nonoverload 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. 
Features
 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


Specifications 

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 

Output 
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 

Linearity 
The integral nonlinearity 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 

Dimensions 
Standard two width module 

Temperature Stability 
0.01% per degree centigrade 

Module connector 
Amphenol connector type 2615924PH (24 pin type) or NIM standard, as per AEC specifications TID 20893 (Rev) Type AMP 2041865 