| 摘要 |
An apparatus is presented for performing standard cell intercomparisons. An operator selects two cells in order to compare their relative voltage values. A first terminal on each cell is coupled through a common line switch associated with that cell to a common line. A second terminal on each cell is similarly coupled through an associated A switch to an A line and through an associated B switch to a B line. A potentiometer can be used to compare the voltage on line A with the voltage on line B to determine the relative voltage difference between the cells. Various mechanisms within the apparatus insure protection of the cells. These mechanisms include: encoding of selection information to insure only one cell for the A line and only one cell for the B line is selected; limiting the power available to switches so only one switch can be turned on within a given time span; inclusion of a protection line associated with the A line, and a protection line associated with the B line so that a logic control circuit can detect when a cell is coupled to the A line or the B line and prevent a second cell from being coupled to either the A line or the B line; and, requiring an operator to simultaneously depress two pushbuttons located on a front panel of the apparatus in order to select a cell to be coupled to either the A line or the B line.
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