RANGE OF ELECTRONIC SUBSYSTEM

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The electronic subsystem has a range of 10 to 10 counts/sec true random input. Because of the random nature of the input signal, the pulse width of the incoming signal should be minimized in order to minimize counting loss due to random coincidences of pulses. With the in-core system, the pulse width — limited by rise time and collection time — is approximately 0. 3 psec. Thus, at a

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true random input of 1 x 10 cps there will be a counting loss of 23 percent of true count rate.

This is equivalent to 1. 63 percent of full-scale analog output current or voltage, and is well within the allowed tolerance for a seven-decade logarithmic instrument. An experimental determination of the counting loss for the in-core system is shown in Figure 6-13. The counting, loss of the ° out-of-core system is shown in Figures 6-14 and 6-15. These curves compare well with the theoretical loss calculated. Improvements in the speed of the subsystem are possible, and can be made where upper half-power frequency of the information pulse will allow it. .

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