Method and arrangement for quantitative potential measurements on surface-wave filters

摘要

For quantitative potential measurement of surface-wave filters, an alternating voltage with amplitude UEi is connected to an input transducer of the surface-wave filter. At a local region for measurement on the filter, an alternating voltage of amplitude UP arises. For each such measuring location, the voltage UP is compared to a nominal value and if it deviates therefrom, this deviation is utilized to control an amplitude of the input voltage UEi so as to maintain the voltage UP substantially constant. For the various measurement locations, the changes of the input voltage UEi are analyzed and a local attenuation factor for each measured region in the filter may be determined. By knowing a frequency of the driving alternating voltage, conclusions can be drawn concerning specific characteristics of the filter.