| 摘要 |
FIELD: analytical measurement technology, biology, medicine, sanitary, hygiene, metallurgy, scientific research and other fields of economy where it is necessary to measure and test content of substances, impurities and foulings by method of voltamperometry. SUBSTANCE: invention is aimed for decrease of measurement error thanks to decrease of random component of interference caused by presence of noises by voltage of amplifiers used in current-to-voltage converter of electrochemical cell. For this standard resistor is connected before each measurement moment into current-to-voltage converter across which this conversion occurs with maximum resistance at which no overload takes place at this time moment. Signal from output of converter is fed to scale converter which gain factor is set inversely proportional to value of resistance of standard resistor connected to converter. Resistances of used resistors are to be advantageously chosen from row making geometric progression with ratio from 2 to 10 depending on range of change of measured current of electrochemical cell and needed speed of response. Signal from output of scale converter is output signal. EFFECT: decreased measurement error. |
