Circuit arrangement for reproducing a tolerance range on a cathode-ray indicator

Claim 1

A circuit arrangement for producing a tolerance range display on a cathode-ray indicator having horizontal and vertical sweep and beam intensity modulation circuits which displays the transmission characteristic of a frequency dependent measuring device comprising a sweep generator, said sweep generator transmitting a sweep voltage to said measuring device, a sawtooth generator, a comparator connected to said measuring device and said sawtooth generator for generating a transmissioncharacteristic intensity modulating pulse for each level coincidence of the signal from said measuring device and the sawtooth signal from said sawtooth generator, a source of a plurality of different reference voltages, a plurality of controllable reference comparators, each of said reference comparators being connected to said sawtooth generator and said source of reference voltages, each of said reference comparators generating a horizontal-line intensity modulating pulse for each level coincidence between the sawtooth signal and a different one of said reference voltages, pulse generator means responsive to said sweep generator for generating frequency indicating pulses occuring at different predetermined frequencies, a binary counter connected to said pulse generator means and being stepped by the frequency indicating pulses, a first logic circuit connected to said binary counter for generating different control pulses dependent on the count in said binary counter, each of said control pulses starting at the beginning of one frequency indicating pulse and ending at the end of the next frequency indicating pulse, means for transmitting said control pulses to different ones of said reference comparators for controlling the times of operation thereof, a second logic circuit connected to said reference comparators, said sawtooth generator and said pulse generator means for generating vertical-line modulating pulses, said second logic circuit including means for initiating a vertical-line modulating pulse upon the coincidence of a selected one of the frequency indicating pulses and selected ones of the horizontal-line intensity modulating pulses and means for terminating such pulses upon receipt of a second horizontal-line intensity modulating pulse while the same frequency indicating pulse is present or upon the occurrence of a particular portion of the sawtooth signal from said sawtooth generator, and means for connectinG said sawtooth generator to the vertical deflection circuits and said sweep generator to said horizontal deflection circuits whereby the beam of the cathode-ray indicator sweeps out a raster, and means for transmitting the horizontal-line intensity modulating pulses, the vertical-line intensity modulating pulses and the transmission-characteristic intensity modulating pulses to said intensity-modulating circuit of said cathode-ray indicator so that selected portions of the horizontal lines corresponding to reference voltage levels and selected portions of vertical lines corresponding to the particular frequencies are displayed with the transmission characteristic.