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The effects of pressure on emission current noise have been studied. Field emission currents from 50ϫ50 arrays and single emitter silicon devices were observed over a range of pressures. The current fluctuations were analyzed in both the time and frequency domain. Signal to noise ratios between 0.9 and 6.9 were observed and appear to be more dependent on operation time and current than on pressures. At higher pressures, emission currents are reduced and the current is cut off completely above adoi:10.1116/1.589326 fatcat:s3gwyvdc4nbn3mu5klwxpl6ikq