| 摘要 |
The measured value is represented by an analog voltage and is converted into a proportional frequency by a voltage-frequency converter, the frequency pulse being controlled by a logic. They are processed in a two-way counter, transfered to a memory and digitally displayed. The control logic receiver, or generator, a clock pulse for transmission of the last digital measured value to the memory. It also sets the counter and a sign generating flip-flop to a starting value, and controls the voltage-frequency converter operation. A zero test circuit transmits a pulse, when a zero counter state appears at negative starting value, for the counter switching. The measured value conversion is terminated by the control logic after a preset time interval. The digital measured value, accepted by the memory after conversion, is supplied to the digital display via a seven-segment decoder. The stored, digital measured value is compared by two identical comparators with two digital limit values. |
