The Model 2015B unit combines, in one single width module, a spectroscopy amplifier with gated baseline restoration and a timing single channel pulse height analyzer.
The 2015B amplifier employs a simple gated baseline restorer which, because of its symmetrical characteristic, provides high resolution for HPGe detectors at low and high counting rates.
Although it is a high performance instrument, the Model 2015B unit is also very versatile. It has all the characteristics necessary to make it useful with scintillation detectors, gas proportional counters, and silicon detectors. High gain, low noise, selectable time constants, and count rate optimization are several of the more important features designed into the amplifier of the Model 2015B unit.
The utility of the Model 2015B amplifier derives from the dual function of its pulse height analyzer circuitry. In the SCA mode of operation, a logic signal output is generated whenever the amplifier unipolar signal falls between the energy levels determined by the front panel controls (E and ΔE). This mode is especially useful when a wide dynamic range is required.
In the Timing (TSCA) mode the same logic signal is generated, but it is referenced in time relative to the leading edge of the preamp signal. This provides a signal that is useful in applications requiring time coincidence.
In addition to the SCA OUTPUT, the Model 2015B unit also provides a multifunction capability which can be programmed internally to provide a lower level (E) Discriminator Output, or an upper level DISCriminator (E + ΔE) Output or to provide an external input level for remote control of the lower level discriminator.
Precise repeatable performance is designed and built into the 2015B unit. The front panel variable controls of the Model 2015B amplifier are precision ten-turn potentiometers. The precision of the ΔE window setting can be further enhanced by use of rear panel sensitivity selector switch (ΔE Range). A front panel LED indicator is provided to assist in set up and troubleshooting. The LED is activated from the lower level discriminator and is useful for setting the discriminator just above the noise.
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