Ortec 552 manual

Time derivation is an important parameter in many experiments. With SCAs that utilize leading-edge timing, the rise time of the input pulses causes degradation of time resolution due to their amplitude variations.

Trailing-edge constant-fraction timing, on the other hand, compensates for varying amplitudes and essentially eliminates this time shift, giving consistently better results. A built-in input attenuator is provided so that the front-panel walk controls can be adjusted rapidly and precisely, to achieve excellent timing performance. Another feature that makes the Model a versatile instrument is a continuously adjustable output delay, which allows output signals with actual time differences to be aligned without the need for additional delay devices or modules.

Alternatively, an external strobe input can be used to produce an SCA output at the desired time. When it is desirable to scan an entire spectrum, a rear-panel connector can be used to provide an external baseline sweep input. With the lower-level Ref switch in the Ext position, the baseline lower-level threshold on which a window is riding can be swept through an energy range and the count rate recorded as a function of energy.

Analysis of the amplifier pulse shape can be useful in separating the detected events from different types of radiation. The best known example is the difference in the neutron and gamma-ray response in some scintillators.

In these cases, stringent conditions are imposed on the electronics because of the nonlinear response of the scintillator as a function of neutron energy.

For example, for neutrons with energies from keV to 10 MeV the response of an NE scintillator can vary over a range. The Model , in conjunction with the ORTEC Model , , or Time-to-Amplitude Converter , will satisfactorily resolve shape variations over a dynamic range in such neutron-gamma applications. Other applications for this feature of the Model are its use with gaseous detectors for particle identification, with large germanium detectors to help optimize their energy resolution, and for determining the position of interaction in a position-sensitive proportional counter.

In all cases, the Model provides a measurement of the input signal shape by evaluating its timing at two different fractions. Performance Input Dynamic Range Minimum resolving time for negative output ns; for positive output ns. Minimum Input Threshold 40 mV for lower-level discriminator. Time Shift vs. The potentiometer determines the threshold setting for the lower-level discriminator when the rear-panel LL Ref mode switch is set on.

When the LL Ref mode switch is in the Ext position, this control is ineffective. This control is disabled when the operating mode switch is set at Int.

In the BI mode, zero-crossing timing is performed on bipolar inputs. ATTN X1, X10, X Front-panel switch selects attenuation factor of high-quality built-in attenuator network for precise walk adjustment setting. Note: The normal operating mode is the X1 position. DELAY Front-panel screwdriver turn potentiometer for continuous adjustment of output delay over a 0.

At the end of this period, the Model resets its internal logic without producing an output signal. For internal strobe, the outputs occur at the selected fraction point of the linear input trailing edge plus the output Delay as selected by the front-panel control.

For external strobe the outputs occur at the time of the strobe signal. The A Output occurs at the selected fraction point of the linear input trailing edge; the B output occurs at the selected fraction point of the linear input trailing edge plus the output Delay as selected by the front-panel control.

Output occurs as leading edge of linear input crosses the lower-level threshold. Our nuclear analysis software and nuclear instrumentation modules can be found in research facilities and educational facilities worldwide. Our hand-held radioisotope identifiers have become a game changer in the nuclear instrumentation industry. We invite you to browse through our website and contact us for all of your radiation detector and nuclear instrumentation needs.

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