419 Precision Pulse Generator

• Simulates detector output signals
• Precision dial may be calibrated to read directly in terms of equivalent energy deposition in semiconductor detectors
• Exponential pulse shape with 5- to 250-ns rise time and 200- or 400-µs decay time constant
• Line frequency or 70-Hz pulse rate
• Positive or negative polarity
• Direct 0 to 10-V output
• Attenuated output with 2000:1 attenuation range
• Internal or external reference voltage

The ORTEC Model 419 is a Precision Pulse Generator that simulates the detection of a nuclear particle reaction in a semiconductor or scintillation detector, as well as serving as a specialized pulse generator for use with pulse processing instrumentation. It can be calibrated to read directly in terms of equivalent energy deposition in semiconductors, and the rise time of the pulse may be varied to simulate the collection time constant in the detector.

The pulses are generated with a mercury-wetted relay that can be operated asynchronously from the line frequency for measurement of spectral broadening caused by hum and ripple of the ac line.

A charge terminator and a 100-W voltage terminator are provided with this instrument. The use of the charge terminator allows the voltage pulse to be converted to a charge pulse for subsequent amplification by a charge-sensitive preamplifier. The use of the voltage terminator allows the voltage pulse to be input directly to other instruments such as amplifiers, discriminators, and ADCs. A holder is provided on the rear panel to store the charge terminator when it is not in use.

The Model 419 maintains the selected amplitude through long experiments because of excellent stability against changes in line voltage and ambient temperature.

An external reference voltage may be used, up to 20 V maximum, to generate arbitrary waveforms, such as a ramp input, to check overall system linearity. The output level is 50% of the input.

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