575A AMPLIFIER

• Low-cost, general-purpose amplifier, for semiconductor detectors, scintillation detectors, and proportional counters
• Positive or negative input
• Gated active baseline restorer with automatic threshold control
• Selectable shaping time constants

The Model 575A Amplifier is ORTEC's most economical, general-purpose NIM amplifier. The low input noise, selectable shaping time constants, and gain range allow operation with semiconductor detectors, proportional counters, and scintillation detectors in a variety of applications. The performance capability of the Model 575A, coupled with its low cost, allows a wide range of uses in such fields as research, environmental monitoring, and teaching.

The Model 575A incorporates an automatic gated baseline restorer (BLR) that causes the system resolution to be nearly independent of input counting rates. The gated baseline restorer includes an automatic noise discriminator that operates the sensing circuits that normally establish the baseline reference for the multichannel analyzer. Performance of the spectrometer often depends on the precision of the setting of the BLR threshold. The Model 575A offers the convenience of an automatic threshold control that typically gives results as good as, or better than, those the most experienced operator could achieve manually.

The pulse-shaping networks in the Model 575A produce semi-Gaussian-shaped output pulses resulting in improved noise performance and reduced amplifier resolving time. The shorter resolving time permits higher counting rates than in amplifiers with classical RC pulse-shaping networks. The Model 575A provides a 10-V linear output with excellent dc stability for both unipolar and bipolar output pulses.

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