Measurement circuit for calibration equipment - measures time for integrator to ramp voltage between two accurately defined levels, esp. for adjustment

摘要

The measurement circuit with a direct voltage source (27) is esp. applicable to alternating voltage integrators of calibration equipment with accurate transfer characteristics, and enables the transfer characteristics of such equipment to be measured and adjusted. Partial voltages from a potential divider are input, with a voltage fed to a direct voltage integrator (20) from the direct voltage source, to a comparator circuit (29). The comparator circuit drives a logic circuit (30) which outputs a signal corresp. to the time constant of the direct voltage integrator RC element (22,26). The precision voltage divider (28) places 0.9 and 0.1 times the source voltage on the comparator element (36,37) inputs. When the integrator switch (42) is opened the output voltage (U3) rises linearly, causing the comparator elements to trigger as it passes the two threshold values set by the potential divider (28).