- Leading edge and crossover type timing derivation
- Dynamic range 100:1
- Exceptional stability - DC coupled input
- Three independent positive and one negative timing
- SCA outputs
- Automatic peak detection
The model SCA 103 analyzes the peak amplitude of energy pulses from nuclear pulse shaping amplifiers for compliance with energy levels determined by front panel controls, and generates two logic outputs which are time derived by the leading edge technique and simultaneously two logic outputs which are time derived by the crossover technique. The unit thus combines the conventional single channel analyzer function with that of an excellent but economical timing analyzer. The leading edge timing technique gives output pulses immediately after-peak of the input pulse. The crossover timing technique exploits the amplitude insensitive zero voltage crossing of a bipolar pulse to provide stable timing reference for a broad energy range.
SIGNAL INPUT: accepts positive +0.1 to 10.1 VDC, unipolar or bipolar (positive lobe leading) pulses from shaping amplifier. DC coupled, input impedance 2 Kohms. Shaping time constant range 0.05 to 10 microseconds. Two front panel BNC connectors
LEADING EDGE OUTPUTS: positive logic +5 V nominal pulse amplitude. Output impedance 50 ohms. Pulse width adjustable from 0.2 to 2 microseconds. Front panel BNC.
CROSSOVER OUTPUTS: one output positive logic +5 V nominal pulse amplitude. Output impedance 50 ohms. Pulse width adjustable from 0.2 to 2 microseconds. Front panel BNC. One negative logic 16 mA current pulse output. Pulse width 20 nanoseconds nominal. Front panel BNC.
CONTROLS LOWER LEVEL: front panel ten-turn locking dial potentiometer to set lower discriminator threshold level
UPPER LEVEL/WINDOW: front panel ten-turn lockingdial potentiometer to set upper discriminator threshold level or window width UPPER LEVEL/WINDOW SWITCH: front panel toggle switch
SCA/LLD: front panel toggle switch to eliminate the upper threshold level CO WALK
ADJUST: front panel 22-turn screwdriver adjust potentiometer to trim walk behavior over dynamic range PULSE WIDTH: front panel 22-turn screwdriver adjust potentiometer to trim positive outputs width
DISCRIMINATOR NONLINEARITY: less than +/- 0.25% of full scale
DISCRIMINATOR STABILITY: better than +/- 0.005%/oC of full scale
DISCRIMINATOR RANGE: 100:1
PULSE PAIR RESOLUTION: 600 nanoseconds
WALK: referenced to 10 V input, for crossover mode +/- 2 nanoseconds, bipolar input pulse with 0.5 microseconds nearGaussian shaping 50:1 dynamic range
+ 6 V 300 mA +12 V 50 mA
- 6 V 30 mA - 12 V 50 mA
SIZE: standard single width NIM module
NET WEIGT: approx. 0.7 kg