Counters and Ratemeters
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CANBERRA can provide several nuclear counting modules designed to monitor the total events and/or the count rate in nuclear single-channel counting applications. These include the Model 512 Dual Counter/Timer, Model 1481LA Linear/Logarithmic Ratemeter and 2081 Linear Ratemeter. These units provide valuable assistance in the laboratory and can be used to satisfy a wide variety of counting applications.
COUNTERS
CANBERRA Industries was the first nuclear instrument manufacturer to introduce a comprehensive data counting system. The original system was based on numerous basic nuclear counting building blocks such as counters and timers, and incorporated “daisy chain” readout capability for digital information. Designed to take advantage of current electronics technology, the Model 512 Dual Counter/Timer features 250 MHz throughput for negative input pulses, and 25 MHz throughput for positive input pulses. A standard RS-232C Serial Interface provides computer control of all 512 functions except the communications parameters which may be adjusted via front panel contr,supols.
The Model 512 Dual Counter Timer provides two counters with 1015-1 count capacity and two high resolution timers with 0.1 ́s preset capability. It has five counting modes and a self-test mode for maximum flexibility when used in different counting/timing applications.
RATEMETERS
A ratemeter is an instrument that measures and displays an average count rate. In a system, it is often used with a single channel analyzer to determine the frequency of occurrence of nuclear events of specific energy. The ratemeter is also useful for system setup by indicating whether or not the instruments preceding it are processing signals.
In a ratemeter, the rate of input is determined by counting the number of pulses that occur over a certain period of time. It is similar to a counter and timer combination; however, the ratemeter performs this determination through analog means and displays the results on a meter directly, in counts per second. In the counter/timer combination, the timer controls the amount of time for which the collection of counts will occur. In the ratemeter, the choice of time constants determines the integration time over which the averaging occurs. The integrator signal is converted to meter current. If the time constant chosen is too long, fast input rates and transients will not be observed accurately. If the time constant is too short, the ratemeter will respond to fluctuations of input count rate. Thus, time constant selection is an extremely important parameter to consider when determining which ratemeter to choose for a particular application.
Other features to consider are the ratemeter’s count rate range, zero offset capabilities, input voltage range, linearity, recorder output voltage, readout accuracy and the type of display. The following selection chart details the ratemeters offered by CANBERRA.
For the entire introduction, please click here.
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Note to our International Customers: The CANBERRA Online Quoting System is only available for our US customers. If you would like a quote on this product, please contact your Local Sales Office for assistance. We apologize for the inconvenience. |
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| Models | ||
| 1481LA : Lin/Log Ratemeter | Request a Quote | |
| 2081 : Linear Ratemeter | Request a Quote | |
| 512 : Dual Counter/Timer | Request a Quote | |
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