| 摘要 |
PURPOSE:To obtain an accurate measured value by halting an automatic calibration giving a quick warning when a phenomenon occures that the change in the span exceeds a certain allowable range within a short time. CONSTITUTION:A control unit 2 provides a command to a discriminator 31 by the operation of a push button 21 for calibration. A counter 5 starts the counting of pulses synchronizing the cycle of sampling data and transmits an OK signal after the passage of the set time. Further, it receives a command for a resetting and starting signal from the control unit 2. A discriminator 37 determines whether the OK signal is inputted or not. A correction level memory register 32 memorizes a correction value given by a standard balance. The register 32 keeps the correction value memorized even when the power source is off. Thus, it resumes calibration if no abnormality is found incomparison with the value previously memorized when the power source is turned on to calibrate or provides a command for emitting a warning when any abnormality is found. |
