Model

Description

Characteristics

Applications

A101

Charge Sensitive Preamplifier & Discriminator

Sensitivity: 1×10⁶ electrons; Variable threshold; TTL and open collector output; 4MHz periodic; Externally adjustable discrimination levels and pulse width

Pulse counting mode with: Photomultiplier tubes (PMT), Channel Electron Multipliers (CEM)

A111 A111F

Charge Sensitive Preamplifier & Discriminator

Sensitivity: 5×10⁴ electrons; Variable threshold; TTL output; 2.5MHz periodic; Analog monitor output; Externally adjustable discrimination level

Pulse counting mode with: Low gain photomultiplier tubes, Proportional counters, and Microchannel plates (MCP)

A121

12MHz Preamplifier Discriminator

Sensitivity: 5×10⁴ electrons; Voltage controlled threshold; 12MHz periodic; Analog monitor output; Adjustable pulse width

Fast pulse counting mode with: Microchannel plates, Channel Electron Multipliers, Low gain PMTs, Proportional counters, and Solid state detectors

A203

Charge Sensitive Preamplifier & Shaper

Preamplifier: Noise 900 electrons RMS; Rise time 50ns Shaper: 300ns Peaking time; Sensitivity 5V/picocoulomb; Unipolar and bipolar outputs available

Analog Mode with: Solid state detectors, Proportional counters, Photomultiplier tubes, and Channel Electron Multipliers

A206

Pulse Amplifier & Discriminator

Amplifier: 10x gain Discriminator: Sensitivity 50mV; 200kHz periodic; Externally adjustable low level discrimination levels and pulse width

To follow a pulse shaper (A203, A225) for 10x gain and provide low level discrimination

A225 A225F

Charge Sensitive Preamplifier & Shaper

Preamplifier: Noise <280 electrons RMS; Rise time 20ns Shaper: 2.5µs peaking time; Sensitivity 5V/picocoulomb

Analog mode with: Solid state detector and Proportional counters Will accept high capacitance detectors

A250 A250F  A250F/NF

Charge Sensitive Preamplifier “State-Of-The-Art”

External FET to match detector characteristics, allows cooling of input FET; Rise time <2.5ns; Noise <100 electrons RMS at +20 °C, <20 electrons RMS with cooled FET

All possible detectors can be connected to the A250 since the input FET is external and sensitivity is variable. The A250 has been called “the best preamplifier in the world”, because it can be adjusted by the user to perfectly match the detector characteristics, reduce noise, and maximize performance in every application.

A275 A275FC  A275FN

Pulse Amplifier

Low noise (4nV/√Hz); Ultra low power (15mW), High slew rate (100V/µs), Wide band (f_t=200MHz); Differential input, configurable as a shaping amplifier with adjustable gain and time constants

Used for gain and shaping with the A250 or other charge preamps

A150

Pulse Amplitude Discriminator

Tunnel diode snap action discriminator; Complementary CMOS outputs; 5MHz periodic; Externally adjustable discrimination level and pulse width

To follow a pulse shaper (A203, A225, A275) for accurate level discrimination

BLR1

Baseline Restorer

Restores baseline in high counting rate applications

For use with the A275, A203, A225

PH300

Peak-Hold Detector

To hold the peak of the analog pulse and interface with Analog to Digital converters. Both Wilkinson type and successive approximation ADC can be accommodated; Low power (<30mW); Low droop rate (<1µV/µs); Fast analog rise time (200ns)

To be used with the A275, A225, A203 or any other pulse amplifier

HV801

High Voltage Optocoupler

Provides linear control of voltages up to 8 kV

High voltage power supply applications