| 摘要 |
PURPOSE:To simplify measuring operations, by alternative and speedy switching into high and low stages of a gauge voltage supplied to a bridge circuit and from its corresponding strain wave forms, induced noise is practically removed by sampling provided by shifting time between concave and convex parts. CONSTITUTION:When a pulse 101a caused from a clock pulse generating circuit 101 is supplied to a voltage switching circuit 102, high-gauge voltage VH and low-gauge voltage VL are supplied alternatingly to a bridge circuit 103, causing thus an output wave of the circuit 103 to assume a shape of 104a. On the other hand, an output of an output switching command circuit 105 is read out, a delay is given by a point adjusting circuit 106 by the specified length of time, sampling of each point voltage value on the wave 104 a is performed with 108 in an alternated manner and the pulse 101a is held during a period of one cycle. A subtracting calculation (110) of the output value is performed by giving an input of thus held wave shape into a microtime holding circuit 109 and by amplifying-smoothing (111, 112) of the wave shape, induction noise is removed virtually and a required strain wave shape can be obtained. Thus, significant simplification of measuring operations becomes available.
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