So, for a 15 second count, the prescale is 4, for a 1 minute count the prescale is 16, for a 4 minute count the prescale is 64.įor Troxler Models 34 devices, a prescale of 8t is used, where t is the duration of the count in minutes. The prescale factors are listed below:įor Troxler Models 3401, 3411, 3430, 3430 Plus, 3440, 3440 Plus, and 4300 devices, a prescale of 16t is used, where t is the duration of the count in minutes. However, the ASTM standards D 6938 and D 2950 give a formula to compute the gauge precision by the slope method, which requires the use of the prescale factor. The prescale factor is typically not needed by the gauge operator. In other words, the count that a gauge displays is the total number of ionization events measured by the gauge divided by the appropriate prescale factor.
In order to scale the count values to a reasonable number of digits, Troxler devices use prescale factors when performing measurements, standard counts and any other diagnostics count.
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