FIELD: metrology.
SUBSTANCE: invention relates to metrology. A method for determining the charge of a chemical current source, according to which the voltage from the second output of the CCS is supplied to the input of the ADC, after which the current value of the voltage at the CCS terminals is stored. The storage of this voltage is carried out according to the first control signal, which is generated using a microcontroller, after which, using the second control signal, which is generated using a microcontroller, the key for charging a capacitor of known capacity from the CCS is closed, with the help of which the second terminal of the CCS is connected to the second plate of the capacitor of known capacitance, after that they wait for some time, characterizing the completion of the transient process of charging a capacitor of known capacity from the CCS, after which the voltage from the second output of the CCS is applied to the first input of the differential amplifier, the second input of which is supplied with voltage from the output of the analog storage device, after which the difference amplifier amplifies the difference of these voltages, after which this amplified difference of these voltages from the output of the difference amplifier is fed to the second input of the ADC built into the microcontroller, with the help of which a digital code is obtained proportional to the voltage difference from the output of the analog storage device and from the second output of the CCS in in the presence of a capacitor of known capacity, after which, taking into account the known capacitance of the capacitor, the equivalent capacitance of the CCS is calculated and the charge of the CCS is calculated from this capacitance, the values of which are displayed on the indicator device, after which the second control signal is made inactive and thereby the switch for charging the capacitor of known capacity is opened from CCS, after which, using the microcontroller, a third control signal of known duration is formed, which is fed to the capacitor discharge key of known capacity, with which this capacitor is discharged and the device is ready for subsequent measurement of the CCS charge.
EFFECT: improving the accuracy of measurements.
1 cl, 1 dwg
