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Eg&g ortec 547 digital signal averager dsa dso varian
EG&G Ortec 547 Digital Signal Averager DSA DSO Varian
A Digital Signal Averager samples and digitizes the applied signal at a regular sampling rate and stores the resulting waveform record. It can repeat this process so that a repetitive input signal can be monitored in exactly the same way on each new cycle. Each record is added to the sum of the previous records so that a continuous summation process takes place. Any asynchronous events (noise) will be reduced in amplitude in relation to the amplitude of the synchronous events (signal), and hence the summed record represents the original signal waveform recovered from the noise. In the case of Gaussian noise, the improvement in signal-to-noise ratio gained from this process is approximately equal to the square root of the number of summed cycles. Hence averaging 100 records of an identical event will improve the signal-to-noise ratio by 10 times. The key characteristic that differentiates a signal averager from other waveform recording devices, such as digital oscilloscopes (DSO's), is that the each new waveform record is added the existing sum of previous records on a point by point basis in real-time using a hardware summing processor as the data is acquired. Although most oscilloscopes can acquire fast waveforms, at the end of each sweep there is usually a significant deadtime while the waveform data is transferred to slower, storage memory. Hence the signal averager gives very short end-of-scan deadtimes, making it capable of averaging at much higher rates than most DSO's. In addition, the SIGNAL RECOVERY digital signal averagers include a further output buffer, so that once an averaged spectrum is complete, it can be instantly transferred to the buffer memory, enabling acquisition of the next average to start. The data in the buffer memory can then be transferred to the host computer while the new data is being acquired.
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