Digital valve corrector for start and/or stop voltages of wobbulator - modulates output frequency with frequency raster generating equidistant frequency marks

摘要

The unit corrects the start and stop voltages. In this process the wobble frequency is superimposed with a frequency raster producing equidistant marks and, by means of an interpolation counter, the time between a start point and a first frequency mark and the time between the first frequency mark and the second frequency mark are measured. A control circuit corrects the digital value determining the start voltage for instance by ensuring that the ratio of these times is in the ratio of the difference of the frequencies at the marks to the difference of the frequencies at the first mark and at the start, and similarly at the stop. USE/ADVANTAGE - Spectrum or network analyser. Improvement in accuracy of digital values.