Abstract: The invention relates to a method for rapidly and accurately displaying the frequency of statistically occurring events, which method provides a display value after only a short period even in the case of low frequencies. The smoothing required for a high-resolution display when events occur at a low frequency is carried out with relatively little delay. It does not prevent a rapid change to higher display values when the frequency of events rises rapidly. Said method is therefore especially suitable for displaying statistically occurring immission and for traffic monitoring and control.

Abstract: According to the invention, sensors which require a high voltage supply and require little current at least for temporary periods are supplied by an blocking oscillator with a high degree of efficiency. The efficiency of said blocking oscillator is due to the low inverse current of the rectifier, the blockage recovery time being short at the same time, the low consumption of the controlling system, and economical and therefore inexpensive voltage measurement. In particular, batteries with an especially long life can be used.