ORTEC 590A Amplifier and Timing Single-Channel Analyzer

This is an ORTEC 590A with Operating and Service Manual. The ORTEC Model 590A Amplifier and Timing Single-Channel Analyzer includes both a low-noise shaping amplifier and a timing single-channel analyzer. The amplifier employs active-filter shaping (0.5, 1.5, and 3.0 μs shaping times) for use with various types of radiation detectors. It is particularly well suited for use with the proportional counters and scintillation detectors normally used in x-ray and nuclear spectroscopy, as well as in x-ray diffraction and Mössbauer experiments. High amplifier gain improves operation of proportional counters because they can be used with lower operating potentials, thus improving the stability of gas gain vs count rate. The amplifier's short resolving time provides high count-rate capability without sacrificing the energy resolution of the proportional counter. The amplifier has a single output that can be switch-selected for either unipolar or bipolar pulse shaping. The unipolar output is used for spectroscopy in systems where dc-coupling can be maintained from the Model 590A to the analyzer. A baseline restorer, (BLR) circuit is included in the amplifier for improved performance at all count rates. Baseline correction is applied only during intervals between input pulses, and the discriminator level to identify input pulses is automatically adjusted. The unipolar output dc-level is within the range from –5 mV to +5 mV. This output permits the use of the direct-coupled input of the analyzer with a minimum amount of interface problems. The timing single-channel analyzer, (TSCA), in the Model 590A is dc-coupled to maintain the peak in an adjusted window without shifts due to changes of count rates. This permits stable operation with narrow window widths over wide variations of count rates, such as those that are usually present during x-ray diffraction studies. The lower level can be adjusted with a front-panel control, or it can be set by an external voltage. The TSCA output occurs ~500 ns after the peak of the amplifier output signal. The walk of this signal is very small over a wide range of input amplitudes, making the Model 590A ideal for use in slow coincidence or gating applications. The External Lower Level, (Ext LLD), input of the Model 590A can be used with an external voltage to set the lower level. It can also be used with a slowly varying voltage to change the lower level as a function of time or other measurement parameters.
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