EG&G ORTEC 113 Manual de funcionamiento y servicio - Página 5
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Imprimir páginaORTEC 113 SCINTILLATION PREAMPLIFIER
1. DESCRIPTION
The ORTEC 113 Scintillation Preamplifier is an al l-
transistor preamplifier designed for use with photomultiplier
tubes. It is a noninverting preamplifier with no provisions
for pulse shaping except the variation of fall time. The 113
is intended to operate into a shaping-type amplifier such
as the ORTEC 410. A diode network prevents destruction
of the input transistor if a sudden positive or negative
high voltage is applied to the input.
2. SPECIFICATIONS
PERFORMANCE
RISE TIME <60 nsec.
PREAMPLIFIER FALL TIME
Fall time constant is
designed for 50 ;usec, assuming a signal source impedance
of 1 Mn.
INTEGRAL NONLINEARITY <0.02%.
TEMPERATURE COEFFICIENT ±0.01%/°C, 10to50°C.
COUNTING RATE The gain shift of a 250-mV reference
pulse is <0.25% with the application of an additional count
rate of 65,000 counts/sec of 200-mV random pulses.
CONTROL
INPUT CAP pF Switch selects desired input capacity: 0,
100,200, 500, or 1000 pF.
INPUT
BNC connector; isolated for 1000 V; positive or negative
polarity, 1 M^2 impedance shunted by 45 pF plus the
capacity selected by switch 81 (0, 100, 200, 500, or
1000 pF).
OUTPUT
BNC connector; output impedance adjustable from 40 to
14012. Output saturation level ±10 V into open circuit;
±5.1 V into 10012 load. Linear output ±7 V into open
circuit; ±3.5 V into 10012 load.
TEST PULSE
BNC connector; accepts a pulse generator output with fast
rise and slow decay to check operation of the electronics;
input impedance 10012.
ELECTRICAL AND MECHANICAL
POWER REQUIRED +24 V dc, 17 mA; -24 V dc, 17 mA;
supplied from any ORTEC transistor main amplifier or an
ORTEC Preamplifier Power Supply through 10-ft captive
cable.
WEIGHT (Shipping) 2.3 lb (1.05 kg).
WEIGHT (Net) 1.5 lb (0.68 kg).
DIMENSIONS 1.75 X 4 X 6 in. (4.5 x 10.2 x 15.3 cm).
RELATED EQUIPMENT
The 113 can be operated with any ORTEC Shaping Main
Amplifier. Test input pulses can be furnished from any
ORTEC Pulse Generator.
3. INSTALLATION INSTRUCTIONS
3.1. CONNECTION TO PHOTOMULTIPLIER TUBE
Connect the output of the photomultiplier to the input of
the 113 with a coaxial cable. This cable should bg kept as
short as practicable. The photomultiplier output can be
taken from the anode, cathode, or any dynode and wil l
generally be ac-coupled. The input connector of the 113 is
isolated for 1000 V dc; however, it can be modified for
3000-V dc isolation by being replaced with a type SHV
connector.
3.2. CONNECTION TO A SHAPING MAIN AMPLIFIER
The 113 can be used to drive long lengths of 9312 cable to
a shaping amplifier and is designed to be directly compatible
with ORTEC transistor main amplifiers.
The output