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General Attributes:

ORTEC Model 850 very good price

• Four completely independent channels for counting selected energies from four detectors
• Dynamic range 500:1
• Integral, normal, and window modes
• DC-coupled input
• LED display of thresholds
• Provision for external baseline sweep

The ORTEC Model 850 Quad Single-Channel Analyzer (SCA) has the exceptionally wide dynamic range, the stability, and the high resolution necessary for use in high-resolution HPGe spectroscopy experiments. These same features provide more than adequate performance with scintillation counters and ionization chambers. DC-coupled input and integrated circuit discriminators, are employed to obtain these characteristics and to assure maximum performance at high counting rates.

The Model 850 consists of four completely independent SCA channels. Each channel is versatile, with three basic operating modes provided. In the Window mode, each channel operates as a high-resolution, narrow (0 to 10%) window, single-channel analyzer. For wide-window applications, the Normal mode is used. In this mode, the upper-level and lower-level controls of each channel are independently variable from 20 mV to 9.99 V, and an output is generated for pulses analyzed between the levels. A front-panel green LED indicates activity. Through the use of separate rear-panel LL Out and UL Out outputs, each channel can operate as a dual, wide-dynamic-range integral discriminator for leading-edge timing or for pulse routing.

For an application where it is desirable to scan an entire spectrum, an external baseline sweep input is provided via the rear-panel LL Ref Ext BNC connector. Printed wiring board jumpers select which of the four channels will use the external baseline sweep. In this mode of operation, the baseline (lower-level threshold) on which a window is riding is swept through an energy range and the count rate is recorded as a function of energy.

The Model 850 has an easy-to-use, built-in digital voltmeter for setting the lower-level and upper-level thresholds of each channel. A front-panel push button selects which of the four channels is being read. A second front-panel push button selects either the lower-level or upper-level reading. The digital volt-meter display flashes on overrange.

Specifications